fggl/entity/CMakeLists.txt

+target_sources(fggl
+        PRIVATE
+        loader/loader.cpp
+        module.cpp
+        )

fggl/entity/loader/loader.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 24/07/22.
+//
+
+#include "fggl/entity/loader/loader.hpp"
+#include "fggl/debug/logging.hpp"
+#include "fggl/scenes/game.hpp"
+
+namespace fggl::entity {
+
+	auto load_scene(assets::Loader* /*loader*/, const assets::AssetID& /*asset*/, const assets::LoaderContext& data, void* ptr) -> assets::AssetRefRaw {
+		auto* gamePtr = (scenes::Game*)ptr;
+		auto filePath = data.assetPath;
+
+		// load assets
+		auto* entityFactory = gamePtr->owner().service<EntityFactory>();
+
+		auto nodes = YAML::LoadAllFromFile(filePath.c_str());
+		for (const auto& node : nodes) {
+			auto scene = node["scene"];
+			if ( !scene ) {
+				debug::warning("no scene node in YAML file...");
+				return nullptr;
+			}
+
+			// create and personalize
+			for (const auto& item : scene) {
+
+				// only safe if personalize is called BEFORE end of loop itr
+				auto personalize = [&entityFactory, &item, gamePtr](EntityManager& manager, const EntityID eid) {
+
+					for ( const auto& compConfig : item["components"]) {
+						auto compName = compConfig.first.as<fggl::util::GUID>();
+						auto& compInfo = entityFactory->getInfo(compName);
+
+						// setup config data
+						ComponentSpec spec;
+						spec.config = compConfig.second;
+
+						// re-run the factory with the modified arguments (might need to support a 'patch' function...)
+						compInfo.factory( spec, manager, eid, gamePtr->owner().services());
+					}
+				};
+
+				// finally, load the entity and trigger personalize
+				auto prefab = item["prefab"].as<fggl::util::GUID>();
+				auto entity = entityFactory->create(prefab, gamePtr->world(), personalize);
+
+				// metadata
+				if ( item["name"].IsDefined() ) {
+					gamePtr->world().setName(item["name"].as<std::string>(), entity);
+				}
+
+				if ( item["tags"].IsDefined() ) {
+					for ( auto tag : item["tags"] ) {
+						auto tagGuid = tag.as<fggl::util::GUID>();
+						gamePtr->world().addTag(entity, tagGuid);
+					}
+				}
+			}
+		}
+
+		return nullptr;
+	}
+
+	auto load_prototype(assets::Loader* /*loader*/, const assets::AssetID &/*guid*/, const assets::LoaderContext& data, EntityFactory* factory) -> assets::AssetRefRaw {
+		auto filePath = data.assetPath;
+
+		// We need to process the prototypes, and load them into the asset system.
+		auto nodes = YAML::LoadAllFromFile(filePath.c_str());
+		for (const auto &node : nodes) {
+			auto prefabs = node["prefabs"];
+
+			for (const auto &prefab : prefabs) {
+				auto name = prefab["name"].as<fggl::util::GUID>();
+				debug::info("found prefab: {}", name);
+
+				// set up the components
+				EntitySpec entity{};
+				entity.parent = prefab["parent"].as<fggl::util::GUID>(NO_PARENT);
+
+				for (const auto &compEntry : prefab["components"]) {
+					auto compId = compEntry.first.as<fggl::util::GUID>();
+
+					ComponentSpec compSpec{};
+					compSpec.config = compEntry.second;
+					entity.components[compId] = compSpec;
+					entity.ordering.push_back(compId);
+
+					debug::trace("prefab {} has component {}", name, compId);
+				}
+
+				if ( prefab["tags"].IsDefined() ) {
+					for ( const auto& tagNode : prefab["tags"] ) {
+						entity.tags.push_back( tagNode.as< util::GUID >() );
+					}
+				}
+
+				factory->define(name, entity);
+			}
+		}
+
+		return nullptr;
+	}
+
+} // namespace fggl::entity
\ No newline at end of file

fggl/entity/module.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// stateless component factories that are probably safe
+//
+
+#include "fggl/entity/module.hpp"
+#include "fggl/math/types.hpp"
+#include "fggl/scenes/game.hpp"
+
+namespace fggl::entity {
+
+	void make_transform(const entity::ComponentSpec &spec, EntityManager &manager, const entity::EntityID entity, modules::Services &/*svc*/) {
+		auto &transform = manager.add<math::Transform>(entity);
+
+		//FIXME won't work for patching!
+		transform.origin(spec.get<math::vec3>("origin", math::VEC3_ZERO));
+		transform.euler(spec.get<math::vec3>("rotation", math::VEC3_ZERO));
+		transform.scale(spec.get<math::vec3>("scale", math::VEC3_ONES));
+
+		debug::trace("created transform for entity {}", (uint64_t) entity);
+	}
+
+	void install_component_factories(entity::EntityFactory *factory) {
+		factory->bind(math::Transform::guid, make_transform);
+	}
+
+	static auto is_scene(std::filesystem::path path) -> assets::AssetTypeID {
+		if ( path.extension() == ".yml" ) {
+			return ENTITY_SCENE;
+		}
+
+		return assets::INVALID_ASSET_TYPE;
+	}
+
+	auto get_scene_deps(const std::string& /*packName*/, std::filesystem::path /*packRoot*/, assets::ResourceRecord& rr) -> bool {
+
+		auto nodes = YAML::LoadAllFromFile( rr.m_path );
+		for ( auto& node : nodes ) {
+			auto scripts = node["scripts"];
+			if ( !scripts ) {
+				continue;
+			}
+
+			for (auto script : scripts) {
+				auto scriptName = script.as<std::string>();
+				auto scriptRef = assets::asset_from_user(scriptName, rr.m_pack);
+				rr.m_requires.push_back(scriptRef);
+			}
+		}
+
+		return true;
+	}
+
+
+	auto ECS::factory(modules::ServiceName service, modules::Services &services) -> bool {
+		if (service == EntityFactory::service) {
+			auto *factory = services.create<EntityFactory>(services);
+			install_component_factories(factory);
+
+			// we are responsible for prefabs...
+			auto *assetLoader = services.get<assets::Loader>();
+			assetLoader->setFactory(ENTITY_PROTOTYPE, [factory](assets::Loader* loader, const assets::AssetID& a, assets::LoaderContext b, void* ptr) {
+				EntityFactory* facPtr = factory;
+				if ( ptr != nullptr ) {
+					facPtr = (EntityFactory*)ptr;
+				}
+				return load_prototype(loader, a, b, facPtr);
+			}, assets::LoadType::PATH);
+			assetLoader->setFactory(ENTITY_SCENE, load_scene, assets::LoadType::PATH);
+
+			// allow auto-detection
+			auto *checkin = services.get<assets::CheckinAdapted>();
+			checkin->setLoader(MIME_SCENE, assets::NEEDS_CHECKIN, is_scene);
+			checkin->setProcessor(MIME_SCENE, get_scene_deps);
+
+			return true;
+		}
+		return false;
+	}
+}
\ No newline at end of file

fggl/fggl.hpp

-#ifndef FGGL_H
-#define FGGL_H
-
-#include <fggl/gfx/display.hpp>
-
-#endif

fggl/gfx/CMakeLists.txt

 
-# OpenGL Backend
-find_package( OpenGL REQUIRED )
-include_directories( ${OPENGL_INCLUDE_DIR} )
+# Sources
+find_package(glfw3 REQUIRED)
 
-# GLEW
-find_package( GLEW REQUIRED )
-include_directories( ${GLEW_INCLUDE_DIRS} )
+include(CMakePrintHelpers)
+cmake_print_variables(GLFW_TARGETS)
+
+target_link_libraries(fggl PUBLIC glfw fggl-glad)
+
+target_sources(fggl
+        PRIVATE
+        window.cpp
+        input.cpp
+        atlas.cpp
+        )
+
+# OpenGL backend
+add_subdirectory(ogl)
+add_subdirectory(ogl4)
 
-find_package( glm REQUIRED )

fggl/gfx/atlas.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <fggl/gfx/atlas.hpp>
+
+#include <array>
+#include <vector>
+
+#define STBRP_STATIC
+#define STB_RECT_PACK_IMPLEMENTATION
+#include "../stb/stb_rect_pack.h"
+
+using Query = std::vector<fggl::gfx::Bounds2D>;
+
+static void populate_stbrp_query(Query &query, std::vector<stbrp_rect> &data) {
+	for (std::size_t i = 0; i < query.size(); i++) {
+		data.push_back({
+						   (int) i,
+						   query[i].size.x,
+						   query[i].size.y,
+						   0,
+						   0,
+						   0
+					   });
+	}
+}
+
+static void unpack_stbrp_query(Query &query, std::vector<stbrp_rect> &data) {
+	for (const auto &rect : data) {
+		query[rect.id].pos = {rect.x, rect.y};
+	}
+}
+
+auto pack_iter(int width, int height, std::vector<stbrp_rect> &query) -> bool {
+	auto *tmp = new stbrp_node[width];
+
+	// setup context
+	stbrp_context context;
+	stbrp_init_target(&context, width, height, tmp, width);
+
+	// see if it worked
+	auto result = stbrp_pack_rects(&context, query.data(), query.size());
+	return result == 1;
+}
+
+namespace fggl::gfx {
+
+	auto pack(std::vector<Bounds2D> &pack) -> bool {
+		// setup query structure
+		std::vector<stbrp_rect> query;
+		query.reserve(pack.size());
+		populate_stbrp_query(pack, query);
+
+		// try packing into powers of 2, starting with 32, up to 4096
+		for (int i = 5; i <= 12; i++) {
+			int dim = i * i;
+			if (pack_iter(dim, dim, query)) {
+				unpack_stbrp_query(pack, query);
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+} // namespace fggl::gfx
+

fggl/gfx/input.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <fggl/gfx/input.hpp>
+
+using fggl::gfx::Input;
+
+Input::Input() : m_mouse_curr(), m_mouse_last(), m_joysticks(), m_joydata(), m_pad_curr(), m_pad_last() {
+	clear();
+}
+
+void Input::clear() {
+	// reset mouse data
+	m_mouse_curr.cursor[0] = 0.0;
+	m_mouse_curr.cursor[1] = 0.0;
+	m_mouse_curr.scroll[0] = 0.0;
+	m_mouse_curr.scroll[1] = 0.0;
+	m_mouse_curr.buttons = 0x00;
+	m_mouse_last = m_mouse_curr;
+
+	// reset pad data
+	for (auto &pad : m_pad_curr) {
+		pad.present = false;
+		pad.buttons.reset();
+		for (float &axe : pad.axes) {
+			axe = 0.0F;
+		}
+	}
+	m_pad_last = m_pad_curr;
+}
+
+void Input::frame() {
+	m_mouse_last = m_mouse_curr;
+	m_mouse_curr.scroll[0] = 0.0;
+	m_mouse_curr.scroll[1] = 0.0;
+
+	m_pad_last = m_pad_curr;
+}
+
+void Input::mousePos(double x, double y) {
+	m_mouse_curr.cursor[0] = x;
+	m_mouse_curr.cursor[1] = y;
+}
+
+auto Input::cursorDeltaX() const -> double {
+	return m_mouse_last.cursor[0] - m_mouse_curr.cursor[0];
+}
+
+auto Input::cursorDeltaY() const -> double {
+	return m_mouse_last.cursor[1] - m_mouse_curr.cursor[1];
+}
+
+auto Input::mousePos() const -> const double * {
+	return m_mouse_curr.scroll.data();
+}
+
+void Input::mouseScroll(double deltaX, double deltaY) {
+	m_mouse_curr.scroll[0] = deltaX;
+	m_mouse_curr.scroll[1] = deltaY;
+}
+
+auto Input::mouseScroll() const -> const double * {
+	return m_mouse_curr.scroll.data();
+}
+
+auto Input::scrollDeltaX() const -> double {
+	return m_mouse_curr.scroll[0];
+}
+
+auto Input::scrollDeltaY() const -> double {
+	return m_mouse_curr.scroll[1];
+}
+
+void Input::mouseBtn(const MouseButton btn, bool state) {
+	if (state) {
+		m_mouse_curr.buttons |= btn;
+	} else {
+		m_mouse_curr.buttons &= ~btn;
+	}
+}
+
+auto Input::mouseDown(const MouseButton btn) const -> bool {
+	return m_mouse_curr.buttons & btn;
+}
+
+auto Input::mousePressed(const MouseButton btn) const -> bool {
+	return (m_mouse_curr.buttons & btn) && !(m_mouse_last.buttons & btn);
+}
+
+auto Input::mouseReleased(const MouseButton btn) const -> bool {
+	return !(m_mouse_curr.buttons & btn) && (m_mouse_last.buttons & btn);
+}
+
+void Input::joystickConnect(int id, Joystick &data) {
+	// joystick data is polled, so we need to call this every frame >.<
+	m_joysticks[id] = true;
+	m_joydata[id] = data;
+}
+
+void Input::joystickDisconnect(int id) {
+	// reset to empty joystick
+	m_joysticks[id] = false;
+	m_joydata[id] = Joystick();
+}
+
+auto Input::hasJoystick(int id) const -> bool {
+	return m_joysticks[id];
+}
+
+auto Input::joystick(int id) const -> const fggl::gfx::Joystick & {
+	return m_joydata[id];
+}
+
+void Input::padState(int id, const PadState &state) {
+	m_pad_curr[id] = state;
+}
+
+auto Input::padDown(int id, PadButton btn) -> bool {
+	return m_pad_curr[id].buttons[(int) btn];
+}
+
+auto Input::padPressed(int id, PadButton btn) -> bool {
+	return m_pad_curr[id].buttons[(int) btn] && !m_pad_last[id].buttons[(int) btn];
+}
+
+auto Input::padReleased(int id, PadButton btn) -> bool {
+	return !m_pad_curr[id].buttons[(int) btn] && m_pad_last[id].buttons[(int) btn];
+}
+
+auto Input::padAxis(int id, PadAxis axis) -> float {
+	return m_pad_curr[id].axes[(int) axis];
+}
+
+auto Input::padAxisDelta(int id, PadAxis axis) -> float {
+	return m_pad_last[id].axes[(int) axis] - m_pad_curr[id].axes[(int) axis];
+}

fggl/gfx/ogl.cpp

-#include <fggl/gfx/ogl.hpp>
-
-#include <stdexcept>
-
-using namespace fggl::gfx;
-
-Graphics::Graphics(Window& window) : m_window(window) {
-	window.activate();
-	GLenum err = glewInit();
-	if ( GLEW_OK != err ) {
-		throw std::runtime_error("couldn't init glew");
-	}
-}
-
-Graphics::~Graphics() {
-}
-
-void Graphics::clear() {
-	m_window.activate();
-
-	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
-	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-}
-

fggl/gfx/ogl.hpp

-#ifndef FGGL_GFX_OGL_H
-#define FGGL_GFX_OGL_H
-
-#include "window.hpp"
-#include "rendering.hpp"
-
-#include <stdexcept>
-
-
-/**
- * FGGL OpenGL 4.x rendering backend.
- */
-namespace fggl::gfx {
-
-	class Graphics {
-		public:
-			Graphics(Window& window);
-			~Graphics();
-
-			void clear();
-
-		private:
-			Window& m_window;
-	};
-
-	class Shader {
-		public:
-			Shader();
-			~Shader();
-
-			inline void use() const {
-				glUseProgram( m_handle );
-			}
-
-			inline GLuint uniform(const std::string& name) {
-				GLint loc = glGetUniformLocation( m_handle, name.c_str() );
-				if ( loc == -1 ) {
-					throw std::runtime_error("invalid shader uniform");
-				}
-				return loc;
-			}
-
-			inline void setInt(const std::string& name, const GLint value) {
-				setInt( uniform(name), value );
-			}
-
-			inline void setInt(GLuint idx, const GLint value) {
-				glUniform1i( idx, value );
-			}
-
-			inline void setFloat(const std::string& name, const GLfloat value) {
-				setFloat( uniform(name), value );
-			}
-
-			inline void setFloat(GLuint idx, const GLfloat value) {
-				glUniform1f( idx, value );
-			}
-
-			inline void setVec2(const std::string& name, const GLfloat* vec) {
-				setVec2( uniform(name), vec );
-			}
-
-			inline void setVec2(GLuint idx, const GLfloat* vec) {
-				glUniform2f( idx, vec[0], vec[1] );
-			}
-
-			inline void setVec3(const std::string& name, const GLfloat* vec) {
-				setVec3( uniform(name), vec );
-			}
-
-			inline void setVec3(GLuint idx, const GLfloat* vec) {
-				glUniform3f( idx, vec[0], vec[1], vec[2] );
-			}
-
-			inline void setMat4(const std::string& name, const GLfloat* mat) {
-				setMat4( uniform(name), mat);
-			}
-
-			inline void setMat4(GLuint idx, const GLfloat* mat) {
-				glUniformMatrix4fv( idx, 1, GL_FALSE, mat );
-			}
-
-		private:
-			int m_handle;
-	};
-}
-
-#endif

fggl/gfx/ogl/CMakeLists.txt

+
+# Sources
+target_sources(fggl
+        PRIVATE
+        backend.cpp
+        shader.cpp
+        renderer.cpp
+        types.cpp
+        )
+
+# OpenGL Backend
+find_package(OpenGL REQUIRED)
+if (MSVC)
+    target_link_libraries(${PROJECT_NAME} PUBLIC OpenGL::GL)
+else ()
+    target_link_libraries(${PROJECT_NAME} PRIVATE OpenGL::OpenGL)
+endif ()
+
+
+# FreeType
+#find_package(Freetype REQUIRED )
+#target_link_libraries(fggl PUBLIC Freetype::Freetype)

fggl/gfx/ogl/backend.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <spdlog/spdlog.h>
+
+#include <fggl/gfx/ogl/backend.hpp>
+#include <stdexcept>
+
+using namespace fggl::gfx;

fggl/gfx/ogl/renderer.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/debug/logging.hpp"
+#include "fggl/debug/pragmas.hpp"
+
+#include "fggl/gfx/ogl/common.hpp"
+#include "fggl/display/glfw/window.hpp"
+
+#include <fggl/gfx/camera.hpp>
+#include <fggl/gfx/ogl/renderer.hpp>
+#include <fggl/gfx/paint.hpp>
+#include "fggl/data/model.hpp"
+#include "fggl/gfx/ogl4/fallback.hpp"
+
+#include <glm/ext/matrix_clip_space.hpp>
+#include <glm/ext/matrix_transform.hpp>
+#include <glm/glm.hpp>
+
+#include <memory>
+
+extern "C" {
+
+/**
+ * Convert an OpenGL source enum to a string.
+ *
+ * list of sources taken from table 20.1, GL Spec 4.5
+ * @param source
+ * @return string representing the source
+ */
+constexpr auto fggl_ogl_source(GLenum source) -> const char * {
+	switch (source) {
+	case GL_DEBUG_SOURCE_API: return "GL";
+	case GL_DEBUG_SOURCE_SHADER_COMPILER: return "GLSL compiler";
+	case GL_DEBUG_SOURCE_WINDOW_SYSTEM: return "Windowing System";
+	case GL_DEBUG_SOURCE_THIRD_PARTY: return "Third Party";
+	case GL_DEBUG_SOURCE_APPLICATION: return "Application";
+	default:
+	case GL_DEBUG_SOURCE_OTHER: return "Other";
+	}
+	assert(false);
+	return "unknown";
+}
+
+/**
+ * Convert an OpenGL type enum to a string.
+ *
+ * list of sources taken from table 20.2, GL Spec 4.5
+ * @param type
+ * @return string representing the type
+ */
+constexpr auto static fggl_ogl_type(GLenum type) -> const char * {
+	switch (type) {
+	case GL_DEBUG_TYPE_ERROR: return "Error";
+	case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: return "Deprecated Behaviour";
+	case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: return "Undefined Behaviour";
+	case GL_DEBUG_TYPE_PERFORMANCE: return "Performance";
+	case GL_DEBUG_TYPE_PORTABILITY: return "Portability";
+	case GL_DEBUG_TYPE_MARKER: return "Marker";
+	case GL_DEBUG_TYPE_PUSH_GROUP: return "Push Group";
+	case GL_DEBUG_TYPE_POP_GROUP: return "Pop Group";
+	default:
+	case GL_DEBUG_TYPE_OTHER: return "Other";
+	}
+	assert(false);
+	return "unknown";
+}
+
+PRAGMA_DIAGNOSTIC_PUSH
+#pragma ide diagnostic ignored "bugprone-easily-swappable-parameters"
+
+constexpr const char *OGL_LOG_FMT{"[GL] {}, {}: [{}]: {}"};
+
+void static GLAPIENTRY fggl_ogl_log(GLenum source,
+										  GLenum type,
+										  unsigned int msgId,
+										  GLenum severity,
+										  GLsizei  /*length*/,
+										  const char *message,
+										  const void * /*userParam*/) {
+
+	const auto *const sourceStr = fggl_ogl_source(source);
+	const auto *const typeStr = fggl_ogl_type(type);
+
+	// table 20.3, GL spec 4.5
+	switch (severity) {
+	case GL_DEBUG_SEVERITY_HIGH: fggl::debug::error(OGL_LOG_FMT, sourceStr, typeStr, msgId, message);
+		break;
+	default:
+	case GL_DEBUG_SEVERITY_MEDIUM: fggl::debug::warning(OGL_LOG_FMT, sourceStr, typeStr, msgId, message);
+		break;
+	case GL_DEBUG_SEVERITY_LOW: fggl::debug::info(OGL_LOG_FMT, sourceStr, typeStr, msgId, message);
+		break;
+	case GL_DEBUG_SEVERITY_NOTIFICATION: fggl::debug::debug(OGL_LOG_FMT, sourceStr, typeStr, msgId, message);
+		break;
+	}
+}
+
+PRAGMA_DIAGNOSTIC_POP
+}
+
+/**
+ * Future optimisations:
+ *   recommended approach is to group stuff in to as few vao as possible - this
+ * will do one vao per mesh, aka bad. Add support for instanced rendering
+ * (particles) Look at packing vertex data in better ways (with profiling)
+ *   Support shader specialisation (ie, dynamic/streamed data)
+ *   Follow best recommendations for Vertex attributes (ie normals not using
+ * floats, bytes for colour)
+ *
+ * Future features:
+ *   Add support for models with weights (for animations)
+ *   OpenGL ES for the FOSS thinkpad users who can't run anything even remotely
+ * modern
+ */
+namespace fggl::gfx {
+
+	using data::Mesh2D;
+	using data::Vertex2D;
+
+	static void setup_shaders(ShaderCache* cache) {
+		// FIXME this should not be hard-coded, it should be part of the scene loading process
+		cache->load(ShaderConfig::named("phong"));
+		cache->load(ShaderConfig::named("redbook/lighting"));
+		cache->load(ShaderConfig::named("redbook/debug"));
+
+		// debug shaders
+		cache->load(ShaderConfig::named("normals", true));
+		cache->load(ShaderConfig::named("debug"));
+	}
+
+	static void splat_checkerboard(GLuint* memory, unsigned int width = 128, unsigned int height = 128) {
+		int counter = 0;
+		auto colour = ogl4::TEX_CHECKER;
+
+		for ( auto i = 0u; i < width * height; ++i) {
+			memory[i] = ogl4::TEX_CHECKER;
+			counter++;
+			if (counter == 5) {
+				counter = 0;
+				colour = colour == ogl4::TEX_CHECKER ? ogl4::TEX_WHITE : ogl4::TEX_CHECKER;
+			}
+		}
+	}
+
+	static auto make_solid(uint8_t width, uint8_t height, GLuint colour) -> ogl::Image {
+		ogl::PixelDataArray data(ogl::PixelFormat::UNSIGNED_INT, width * height);
+		for ( auto i = 0u; i < width * height; ++i) {
+			data.ui[i] = colour;
+		}
+
+		return ogl::Image(
+			ogl::ImageFormat::RGBA,
+			{width, height},
+			std::move(data)
+		);
+	}
+
+	static void setup_fallback_texture(assets::AssetManager* assets) {
+		{
+			// generate the image
+			ogl::Image image(ogl::ImageFormat::RGBA, ogl::PixelFormat::UNSIGNED_INT, {128,128});
+			splat_checkerboard( image.data.ui );
+
+			// setup the texture
+			auto *fallback2D = new ogl::Texture(ogl::TextureType::Tex2D);
+			fallback2D->setData(ogl::InternalImageFormat::RedGreenBlueAlpha, image, ogl::PixelFormat::UNSIGNED_BYTE);
+			assets->set(ogl4::FALLBACK_TEX, fallback2D);
+		}
+
+		{
+			ogl::Image image = make_solid(128, 128, ogl4::TEX_WHITE);
+			auto *solid2D = new ogl::Texture(ogl::TextureType::Tex2D);
+			solid2D->setData(ogl::InternalImageFormat::RedGreenBlueAlpha, image);
+			assets->set(ogl4::SOLID_TEX, solid2D);
+		}
+
+	}
+
+	OpenGL4Backend::OpenGL4Backend(data::Storage *storage, gui::FontLibrary *fonts, assets::AssetManager *assets, GlFunctionLoader loader)
+		: fggl::gfx::Graphics(), m_canvasPipeline(nullptr), m_storage(storage) {
+
+		// load OpenGL context, or fail.
+		int version = gladLoadGLLoader(loader);
+		if (version == 0) {
+			debug::error("Failed to initialize OpenGL context\n");
+			return;
+		}
+
+		// OpenGL debug Support
+		GLint flags = 0;
+		glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
+		if ((flags & GL_CONTEXT_FLAG_DEBUG_BIT) == GL_CONTEXT_FLAG_DEBUG_BIT) { // NOLINT(hicpp-signed-bitwise)
+			debug::info("enabling OpenGL debug output");
+			glEnable(GL_DEBUG_OUTPUT);
+			glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+			glDebugMessageCallback(fggl_ogl_log, nullptr);
+			glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, GL_TRUE);
+		}
+
+		// setup the viewport based on the window's framebuffer
+		//auto fbSize = owner.frameSize();
+		//glViewport(0, 0, fbSize.x, fbSize.y);
+
+		// setup the shader cache
+		m_cache = std::make_unique<ShaderCache>(m_storage);
+		setup_shaders(m_cache.get());
+
+		// setup 2D rendering system
+		ShaderConfig shader2DConfig = ShaderConfig::named("canvas");
+		m_canvasPipeline = m_cache->load(shader2DConfig);
+		if (m_canvasPipeline == nullptr) {
+			debug::error("failed to load shader2D - using fallback");
+			m_canvasPipeline = m_cache->get(ogl4::FALLBACK_CANVAS_PIPELINE);
+		}
+
+		// fallback textures
+		setup_fallback_texture(assets);
+
+		// rendering helpers
+		m_canvasRenderer = std::make_unique<ogl4::CanvasRenderer>(fonts);
+		m_modelRenderer = std::make_unique<ogl4::StaticModelRenderer>(m_cache.get(), assets);
+
+		m_debugRenderer = std::make_unique<ogl4::DebugRenderer>(m_cache->getOrLoad(ShaderConfig::named("debug")));
+		if (m_debugRenderer) {
+			dd::initialize(m_debugRenderer.get());
+		}
+	};
+
+	void OpenGL4Backend::clear() {
+		glClearColor(0.0F, 0.0F, 0.0F, 0.0F);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	}
+
+	void OpenGL4Backend::draw2D(const gfx::Paint &paint) {
+		if (!m_canvasRenderer) {
+			return;
+		}
+
+		m_canvasRenderer->render(*m_canvasPipeline, paint);
+	}
+
+	void OpenGL4Backend::drawScene(entity::EntityManager &world, bool debugMode) {
+		if (m_modelRenderer) {
+			m_modelRenderer->render(world, debugMode);
+		}
+
+		if (m_debugRenderer) {
+			auto cameras = world.find<gfx::Camera>();
+			if (cameras.empty()) {
+				return;
+			}
+
+			auto cameraEnt = cameras.front();
+
+			const auto &camTransform = world.get<math::Transform>(cameraEnt);
+			const auto &camComp = world.get<gfx::Camera>(cameraEnt);
+
+			const math::mat4 projectionMatrix =
+				glm::perspective(camComp.fov, camComp.aspectRatio, camComp.nearPlane, camComp.farPlane);
+			const math::mat4 viewMatrix = glm::lookAt(camTransform.origin(), camComp.target, camTransform.up());
+			m_debugRenderer->mvpMatrix = projectionMatrix * viewMatrix;
+
+			dd::flush();
+		}
+	}
+
+	void OpenGL4Backend::resize(int width, int height) {
+		glViewport(0, 0, width, height);
+	}
+
+}  // namespace fggl::gfx

fggl/gfx/ogl/shader.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/gfx/ogl/types.hpp"
+#include <fggl/gfx/ogl/shader.hpp>
+#include "fggl/gfx/ogl4/fallback.hpp"
+
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <spdlog/spdlog.h>
+
+namespace fggl::gfx {
+
+	auto ShaderCache::compileShaderFromSource(const std::string &source, GLuint sid) -> bool {
+		// upload and compile shader
+		const char *src = source.c_str();
+		glShaderSource(sid, 1, &src, nullptr);
+		glCompileShader(sid);
+
+		// check it worked
+		GLint compiled = GL_FALSE;
+		glGetShaderiv(sid, GL_COMPILE_STATUS, &compiled);
+		if (compiled == GL_FALSE) {
+
+			GLint maxLength = 0;
+			glGetShaderiv(sid, GL_INFO_LOG_LENGTH, &maxLength);
+			char *infoLog = new char[maxLength];
+			glGetShaderInfoLog(sid, maxLength, &maxLength, infoLog);
+
+			spdlog::warn("could not compile shader source: {}", infoLog);
+			delete[] infoLog;
+			return false;
+		}
+
+		return true;
+	}
+
+	auto ShaderCache::readAndCompileShader(const std::string &filename, GLuint shader) -> bool {
+		std::string source;
+		bool result = m_storage->load(fggl::data::Data, filename, &source);
+		if (!result) {
+			spdlog::warn("could not load shader source from disk: {}", filename.c_str());
+			return false;
+		}
+
+		return compileShaderFromSource(source, shader);
+	}
+
+	ShaderCache::ShaderCache(fggl::data::Storage *storage) : m_storage(storage), m_shaders(), m_binary(true) {
+
+		if (!GLAD_GL_ARB_get_program_binary) {
+			spdlog::warn("the graphics card doesn support shader caching, disabling");
+			m_binary = false;
+		} else {
+			// debug - disable shader cache
+			m_binary = false;
+		}
+
+		if (GLAD_GL_ARB_shading_language_include) {
+			setupIncludes();
+		}
+		initFallbackPipelines();
+	}
+
+	void ShaderCache::setupIncludes() {
+		auto root = m_storage->resolvePath(data::StorageType::Data, "include");
+		auto paths = m_storage->findResources(root, ".glsl");
+
+		for (auto &path : paths) {
+			std::string source;
+			m_storage->load(fggl::data::Data, path.string(), &source);
+
+			auto relPath = std::filesystem::relative(path, root);
+			const auto relPathStr = "/" + relPath.string();
+			glNamedStringARB(GL_SHADER_INCLUDE_ARB, -1, relPathStr.c_str(), -1, source.c_str());
+		}
+
+	}
+
+	auto ShaderCache::loadFromDisk(GLuint pid, const std::string &pipelineName) -> bool {
+
+		BinaryCache cache;
+		auto fname = "shader_" + pipelineName + ".bin";
+		bool status = m_storage->load(fggl::data::Cache, fname, &cache);
+
+		if (!status) {
+			spdlog::info("cached shader '{}' could not be loaded from disk", pipelineName);
+			return false;
+		}
+
+		bool result = cacheLoad(pid, &cache);
+		std::free(cache.data);
+		return result;
+	}
+
+	void ShaderCache::saveToDisk(GLuint pid, const std::string &pipelineName) {
+		BinaryCache cache;
+		cacheSave(pid, &cache);
+
+		auto fname = "shader_" + pipelineName + ".bin";
+		m_storage->save(fggl::data::Cache, fname, &cache);
+	}
+
+	auto ShaderCache::getOrLoad(const ShaderConfig &config) -> ShaderCache::ShaderPtr {
+		try {
+			return m_shaders.at(config.name);
+		} catch (std::out_of_range &e) {
+			return load(config);
+		}
+	}
+
+	auto ShaderCache::get(const std::string &name) -> ShaderCache::ShaderPtr {
+		auto itr = m_shaders.find(name);
+		if ( itr != m_shaders.end() ){
+			return itr->second;
+		}
+		return nullptr;
+	}
+
+	auto ShaderCache::load(const ShaderConfig &config) -> ShaderCache::ShaderPtr {
+		spdlog::debug("starting shader program generation for {}", config.name);
+
+		GLuint pid = glCreateProgram();
+
+		if (m_binary) {
+			// if we have support for shader cache, give that a go
+			bool worked = loadFromDisk(pid, config.name);
+			if (worked) {
+				auto shader = std::make_shared<ogl::Shader>(pid);
+				m_shaders[config.name] = shader;
+				return shader;
+			}
+
+			spdlog::debug("could not use cached shader for '{}', doing full compile.", config.name);
+		}
+
+		// TODO actual shader loading
+		GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
+		readAndCompileShader(config.vertex, vertShader);
+		glAttachShader(pid, vertShader);
+
+		GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+		readAndCompileShader(config.fragment, fragShader);
+		glAttachShader(pid, fragShader);
+
+		GLuint geomShader = 0;
+		if (config.hasGeom) {
+			geomShader = glCreateShader(GL_GEOMETRY_SHADER);
+			readAndCompileShader(config.geometry, geomShader);
+			glAttachShader(pid, geomShader);
+		}
+
+		glLinkProgram(pid);
+		glDetachShader(pid, vertShader);
+		glDetachShader(pid, fragShader);
+
+		if (config.hasGeom) {
+			glDetachShader(pid, geomShader);
+		}
+
+		GLint linked = GL_FALSE;
+		glGetProgramiv(pid, GL_LINK_STATUS, &linked);
+		if (linked == GL_FALSE) {
+
+			// get the error
+			std::array<char, 512> infoLog;
+			glGetProgramInfoLog(pid, infoLog.size(), nullptr, infoLog.data());
+			spdlog::warn("linking shader program '{}' failed: {}", config.name, infoLog.data());
+
+			// cleanup
+			glDeleteProgram(pid);
+			glDeleteShader(vertShader);
+			glDeleteShader(fragShader);
+			if (config.hasGeom) {
+				glDeleteShader(geomShader);
+			}
+
+			return nullptr;
+		}
+
+		if (m_binary) {
+			saveToDisk(pid, config.name);
+		}
+
+		// update the cache and return
+		auto shaderPtr = std::make_shared<ogl::Shader>(pid);
+		m_shaders[config.name] = shaderPtr;
+		return shaderPtr;
+	}
+
+	auto ShaderCache::load(const ShaderSources &sources, bool allowBinaryCache) -> ShaderCache::ShaderPtr {
+
+		spdlog::debug("starting shader program generation for {}", sources.name);
+
+		GLuint pid = glCreateProgram();
+
+		if (m_binary && allowBinaryCache) {
+			// if we have support for shader cache, give that a go
+			bool worked = loadFromDisk(pid, sources.name);
+			if (worked) {
+				auto shader = std::make_shared<ogl::Shader>(pid);
+				m_shaders[sources.name] = shader;
+				return shader;
+			}
+
+			spdlog::debug("could not use cached shader for '{}', doing full compile.", sources.name);
+		}
+
+		// TODO actual shader loading
+		GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
+		compileShaderFromSource(sources.vertexSource, vertShader);
+		glAttachShader(pid, vertShader);
+
+		GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+		compileShaderFromSource(sources.fragmentSource, fragShader);
+		glAttachShader(pid, fragShader);
+
+		GLuint geomShader = INVALID_SHADER_ID;
+		if (!sources.geometrySource.empty()) {
+			geomShader = glCreateShader(GL_GEOMETRY_SHADER);
+			compileShaderFromSource(sources.geometrySource, geomShader);
+			glAttachShader(pid, geomShader);
+		}
+
+		glLinkProgram(pid);
+		glDetachShader(pid, vertShader);
+		glDetachShader(pid, fragShader);
+
+		if (geomShader != INVALID_SHADER_ID) {
+			glDetachShader(pid, geomShader);
+		}
+
+		GLint linked = GL_FALSE;
+		glGetProgramiv(pid, GL_LINK_STATUS, &linked);
+		if (linked == GL_FALSE) {
+
+			// get the error
+			std::array<char, 512> infoLog{};
+			glGetProgramInfoLog(pid, infoLog.size(), nullptr, infoLog.data());
+			spdlog::warn("linking shader program '{}' failed: {}", sources.name, infoLog.data());
+
+			// cleanup
+			glDeleteProgram(pid);
+			glDeleteShader(vertShader);
+			glDeleteShader(fragShader);
+			if (geomShader != INVALID_SHADER_ID) {
+				glDeleteShader(geomShader);
+			}
+
+			return nullptr;
+		}
+
+		if (m_binary && allowBinaryCache) {
+			saveToDisk(pid, sources.name);
+		}
+
+		// update the cache and return
+		m_shaders[sources.name] = std::make_shared<ogl::Shader>(pid);
+		return m_shaders[sources.name];
+	}
+
+	void ShaderCache::cacheSave(GLuint pid, BinaryCache *cache) {
+		GLsizei length;
+		glGetProgramiv(pid, GL_PROGRAM_BINARY_LENGTH, &length);
+
+		cache->data = std::malloc(length);
+		cache->size = length;
+
+		glGetProgramBinary(pid, length, &cache->size, &cache->format, cache->data);
+	}
+
+	auto ShaderCache::cacheLoad(GLuint pid, const BinaryCache *cache) -> bool {
+		if (!m_binary) {
+			return false;
+		}
+		glProgramBinary(pid, cache->format, cache->data, cache->size);
+
+		// check it loaded correctly
+		GLint status = GL_FALSE;
+		glGetProgramiv(pid, GL_LINK_STATUS, &status);
+		return status == GL_TRUE;
+	}
+
+	void ShaderCache::initFallbackPipelines() {
+		// canvas fallback pipeline
+		load({
+				 .name = ogl4::FALLBACK_CANVAS_PIPELINE,
+				 .vertexSource = ogl4::FALLBACK_CANVAS_VERTEX_SHADER,
+				 .fragmentSource = ogl4::FALLBACK_CANVAS_FRAGMENT_SHADER,
+				 .geometrySource = ""
+			 }, false);
+	}
+
+}
+
+	template<>
+	auto fggl::data::fggl_deserialize(std::filesystem::path &data, fggl::gfx::BinaryCache *out) -> bool {
+		auto* f =
+			#ifdef _MSC_VER
+			_wfopen(data.c_str(), L"r");
+			#else
+			std::fopen(data.c_str(), "r");
+		#endif
+
+		if (f == nullptr) {
+			spdlog::warn("could not load cached shader, fp was null");
+			return false;
+		}
+
+		auto rsize = std::fread(&out->format, sizeof(GLenum), 1, f);
+		if (rsize != 1) {
+			spdlog::warn("could not load cached shader: type read failed");
+			std::fclose(f);
+			return false;
+		}
+
+		out->size = 0;
+		rsize = std::fread(&out->size, sizeof(GLsizei), 1, f);
+		if (rsize != 1) {
+			spdlog::warn("could not load cached shader: size read failed");
+			std::fclose(f);
+			return false;
+		}
+
+		out->data = std::malloc(out->size);
+		auto readSize = std::fread(out->data, out->size, 1, f);
+
+		auto result = true;
+		if (readSize != 1) {
+			spdlog::warn("could not load cached shader: reading failed!");
+			std::free(out->data);
+			result = false;
+		}
+
+		std::fclose(f);
+		return result;
+	}
+
+
+template<>
+auto fggl::data::fggl_deserialize(std::filesystem::path &data, std::string *out) -> bool {
+	std::ifstream ifs(data);
+	out->assign((std::istreambuf_iterator<char>(ifs)),
+				(std::istreambuf_iterator<char>()));
+	return true;
+}
+
+template<>
+auto fggl::data::fggl_serialize(std::filesystem::path &data, const fggl::gfx::BinaryCache *out) -> bool {
+
+	// try and write
+	auto *f =
+		#ifdef _MSC_VER
+		_wfopen( data.c_str(), L"w");
+		#else
+		std::fopen(data.c_str(), "w");
+	#endif
+
+	if (f == nullptr) {
+		return false;
+	}
+
+	std::fwrite(&out->format, sizeof(GLenum), 1, f);
+	std::fwrite(&out->size, sizeof(GLsizei), 1, f);
+	std::fwrite(out->data, out->size, 1, f);
+
+	std::fclose(f);
+	std::free(out->data);
+
+	return true;
+}

fggl/gfx/ogl/types.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/gfx/ogl/types.hpp"
+#include <cassert>
+
+//
+// special defines:
+//
+// FGGL_GL_I_BOUND will take responsibility away from fggl for ensuring buffers are bound before use.
+// FGGL_GL_PARANOID will try to ensure that openGL state is managed correctly in method calls, but will be slower
+
+namespace fggl::gfx::ogl {
+
+	template<> const BuffAttrF attr_type<float>::attr = BuffAttrF::FLOAT;
+	template<> const BuffAttrF attr_type<math::vec2>::attr = BuffAttrF::FLOAT;
+	template<> const BuffAttrF attr_type<math::vec3>::attr = BuffAttrF::FLOAT;
+	template<> const BuffAttrF attr_type<math::vec4>::attr = BuffAttrF::FLOAT;
+	template<> const GLint attr_type<float>::size = 1;
+	template<> const GLint attr_type<math::vec2>::size = 2;
+	template<> const GLint attr_type<math::vec3>::size = 3;
+	template<> const GLint attr_type<math::vec4>::size = 4;
+
+	VertexArray::VertexArray() {
+		glGenVertexArrays(1, &m_obj);
+	}
+
+	VertexArray::~VertexArray() {
+		release();
+	}
+
+	VertexArray::VertexArray(VertexArray &&other) noexcept: m_obj(other.m_obj) {
+		other.m_obj = 0;
+	}
+
+	auto VertexArray::operator=(VertexArray &&other) -> VertexArray & {
+		if (this != &other) {
+			release();
+			std::swap(m_obj, other.m_obj);
+		}
+		return *this;
+	}
+
+	void VertexArray::release() {
+		glDeleteVertexArrays(1, &m_obj);
+		m_obj = 0;
+	}
+
+	void VertexArray::setAttribute(const ArrayBuffer &buff, GLuint idx, AttributeF &attr) {
+		assert(0 <= idx && idx < GL_MAX_VERTEX_ATTRIBS);
+		assert(1 <= attr.elmCount && attr.elmCount <= 4);
+		assert(buff.isValid());
+
+		#ifndef FGGL_GL_I_BOUND
+		bind();
+		GLuint boundVertexArray = 0;
+		bind_buffer(&boundVertexArray, buff);
+		#endif
+
+		glEnableVertexAttribArray(idx);
+		glVertexAttribPointer(idx, attr.elmCount, (GLenum) attr.attrType, GL_FALSE, attr.stride, (void *) attr.offset);
+
+		#ifndef FGGL_GL_I_BOUND
+		unbind_buffer(&boundVertexArray, buff);
+		#endif
+	}
+
+	void VertexArray::setAttribute(const ArrayBuffer &buff, GLuint idx, AttributeI &attr, bool normalized) {
+		assert(0 <= idx && idx < GL_MAX_VERTEX_ATTRIBS);
+		assert(1 <= attr.elmCount && attr.elmCount <= 4);
+		assert(buff.isValid());
+
+		#ifndef FGGL_GL_I_BOUND
+		GLuint boundVertexArray = 0;
+		bind_buffer(&boundVertexArray, buff);
+		#endif
+
+		glVertexAttribPointer(idx,
+							  attr.elmCount,
+							  (GLenum) attr.attrType,
+							  (GLboolean) normalized,
+							  attr.stride,
+							  (void *) attr.offset);
+
+		#ifndef FGGL_GL_I_BOUND
+		unbind_buffer(&boundVertexArray, buff);
+		#endif
+	}
+
+	void VertexArray::setAttributeI(const ArrayBuffer &buff, GLuint idx, AttributeI &attr) {
+		assert(0 <= idx && idx < GL_MAX_VERTEX_ATTRIBS);
+		assert(1 <= attr.elmCount && attr.elmCount <= 4);
+		assert(buff.isValid());
+
+		#ifndef FGGL_GL_I_BOUND
+		GLuint boundVertexArray = 0;
+		bind_buffer(&boundVertexArray, buff);
+		#endif
+
+		glVertexAttribIPointer(idx, attr.elmCount, (GLenum) attr.attrType, attr.stride, (void *) attr.offset);
+
+		#ifndef FGGL_GL_I_BOUND
+		unbind_buffer(&boundVertexArray, buff);
+		#endif
+	}
+
+	void VertexArray::drawElements(const ElementBuffer &buff, Primitive drawType, std::size_t size) {
+		bind();
+
+		#ifndef FGGL_I_BOUND
+		GLuint boundElementArray = 0;
+		bind_buffer(&boundElementArray, buff);
+		#endif
+
+		glDrawElements((GLenum) drawType, (GLsizei) size, GL_UNSIGNED_INT, nullptr);
+
+		#ifndef FGGL_I_BOUND
+		unbind_buffer(&boundElementArray, buff);
+		#endif
+	}
+
+	void VertexArray::draw(Primitive drawType, int first, std::size_t count) {
+		glDrawArrays((GLenum) drawType, first, count);
+	}
+
+} // namespace fggl::gfx::ogl
\ No newline at end of file

fggl/gfx/ogl4/CMakeLists.txt

+
+# Sources
+target_sources(fggl
+        PRIVATE
+        setup.cpp
+        canvas.cpp
+        models.cpp
+        debug.cpp
+        meshes.cpp
+        module.cpp
+        )

fggl/gfx/ogl4/canvas.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/gfx/ogl/common.hpp"
+#include "fggl/gfx/ogl4/canvas.hpp"
+
+#include "fggl/data/model.hpp"
+#include "fggl/math/types.hpp"
+
+#include <glm/gtc/type_ptr.hpp>
+#include "fggl/math/triangulation.hpp"
+
+#include "fggl/gui/fonts.hpp"
+
+#define FGGL_OPENGL_CORRECTNESS
+
+namespace fggl::gfx::ogl4 {
+
+	static void make_box(gfx::Path2D &path, glm::vec2 topLeft, glm::vec2 bottomRight) {
+		path.moveTo({topLeft.x, topLeft.y});
+		path.pathTo({bottomRight.x, topLeft.y});
+		path.pathTo({bottomRight.x, bottomRight.y});
+		path.pathTo({topLeft.x, bottomRight.y});
+		path.pathTo({topLeft.x, topLeft.y});
+	}
+
+	inline static void add_mesh_triangle(data::Mesh2D &mesh, const std::vector<data::Vertex2D> &verts) {
+		assert(verts.size() == 3);
+		for (const auto &vert : verts) {
+			auto idx = mesh.add_vertex(vert);
+			mesh.add_index(idx);
+		}
+	}
+
+	static void convert_to_mesh(const gfx::Paint &paint, data::Mesh2D &mesh) {
+		for (const auto &cmd : paint.cmds()) {
+			auto path = cmd.path;
+
+			std::vector<data::Vertex2D> verts;
+			math::vec3 colour{1.0F, 1.0F, 1.0F};
+			auto idx = 0;
+			auto colourIdx = 0;
+
+			for (auto &type : path.m_types) {
+				if (type == PathType::PATH) {
+					verts.push_back({path.m_points[idx++], colour});
+				} else if (type == PathType::MOVE) {
+					// polygon finished
+					if (verts.size() < 3) {
+						// empty, point, or line
+						// TODO deal with whatever I'm meant to do with this...
+					} else if (verts.size() == 3) {
+						// triangle
+						add_mesh_triangle(mesh, verts);
+					} else {
+						// polygon
+						math::fan_triangulation(verts, mesh);
+					}
+
+					verts.clear();
+					verts.push_back({path.m_points[idx++], colour});
+				} else if (type == PathType::COLOUR) {
+					colour = path.m_colours[colourIdx++];
+				} else {
+					// unsupported type
+				}
+			}
+
+			if (!verts.empty() && verts.size() > 3) {
+				math::fan_triangulation(verts, mesh);
+			}
+		}
+	}
+
+	CanvasRenderer::CanvasRenderer(fggl::gui::FontLibrary *fonts) :
+		m_bounds({0.0F, 1920.F, 1080.0F, 0.0F}),
+		m_fonts(fonts),
+		m_fontTex(ogl::TextureType::Tex2D) {
+		m_vao.bind();
+
+		#ifdef FGGL_GL_I_BOUND
+		// user will handle binding themselves usually, so attribute won't bind itself.
+		// which means it's our problem right now...
+		GLuint originalVertexList;
+		ogl::bind_buffer( &originalVertexList, m_vertexList );
+		#endif
+
+		// define our attributes
+		auto posAttr = ogl::attribute<data::Vertex2D, math::vec2>(offsetof(data::Vertex2D, position));
+		auto colAttr = ogl::attribute<data::Vertex2D, math::vec3>(offsetof(data::Vertex2D, colour));
+		auto texAttr = ogl::attribute<data::Vertex2D, math::vec2>(offsetof(data::Vertex2D, texPos));
+
+		// bind the attributes to the vao
+		m_vao.setAttribute(m_vertexList, 0, posAttr);
+		m_vao.setAttribute(m_vertexList, 1, colAttr);
+		m_vao.setAttribute(m_vertexList, 2, texAttr);
+
+		#ifdef FGGL_GL_I_BOUND
+		// cool, rebind whatever happened before, or not
+		ogl::unbind_buffer( &originalVertexList, m_vertexList );
+		#endif
+
+		glBindVertexArray(0);
+	}
+
+	void CanvasRenderer::renderShapes(const gfx::Paint &paint, ogl::Shader& shader) {
+		data::Mesh2D mesh;
+		convert_to_mesh(paint, mesh);
+
+		// nothing to render? give up
+		if (mesh.indexList.empty()) {
+			return;
+		}
+
+		// update data
+		m_vao.bind();
+		m_vertexList.replace(mesh.vertexList.size(), mesh.vertexList.data());
+		m_indexList.replace(mesh.indexList.size(), mesh.indexList.data());
+
+		// draw
+		glDisable(GL_DEPTH_TEST);
+		glDisable(GL_CULL_FACE);
+
+		auto projMat = glm::ortho(m_bounds.left, m_bounds.right, m_bounds.bottom, m_bounds.top);
+		shader.use();
+		shader.setUniformMtx(shader.uniform("projection"), projMat);
+
+		// draw elements
+		m_vao.drawElements(m_indexList, ogl::Primitive::TRIANGLE, mesh.indexList.size());
+
+		// cleanup
+		glUseProgram(0);
+		glEnable(GL_DEPTH_TEST);
+		glEnable(GL_CULL_FACE);
+	}
+
+	// slow version
+	void CanvasRenderer::renderText(const Paint &paint, ogl::Shader& shader) {
+		if (paint.textCmds().empty()) {
+			return;
+		}
+
+
+		// get the expected font
+		std::shared_ptr<gui::FontFace> face = m_fonts->getDefaultFont();
+		if (face == nullptr) {
+			// we don't know about that font...
+			return;
+		}
+
+		// set up the shader
+		shader.use();
+		auto projMat = glm::ortho(0.0F, 1920.0F, 1080.0F, 0.F);
+		shader.setUniformMtx(shader.uniform("projection"), projMat);
+
+		// bind the vbo we'll use for writing
+		m_vao.bind();
+
+		// set up the openGL state we expect for rendering
+		glDisable(GL_DEPTH_TEST);
+		glDisable(GL_CULL_FACE);
+
+		glEnable(GL_BLEND);
+		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+		// for each text string, attempt to render it
+		for (const auto &textCmd : paint.textCmds()) {
+			const auto label = textCmd.text;
+			math::vec2 penPos(textCmd.pos);
+
+			// set up a non-owning holder for the characters
+			data::Texture2D tex;
+			tex.channels = 1;
+
+			for (auto letter : label) {
+
+				glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+				face->texture(letter, tex.size.x, tex.size.y, &tex.data);
+				m_fontTex.setData(ogl::InternalImageFormat::Red, &tex);
+
+				glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+				glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+				glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+				glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+				m_fontTex.bind(1);
+				shader.setUniformI(shader.uniform("tex"), 1);
+
+				// this is why this is called the slow version, we render each quad as a single call
+				auto &metrics = face->metrics(letter);
+				const float xPos = penPos.x + metrics.bearing.x;
+				const float yPos = (penPos.y - metrics.bearing.y);
+				const float w = metrics.size.x;
+				const float h = metrics.size.y;
+
+				std::array<data::Vertex2D, 6> verts{{
+														{{xPos, yPos + h}, textCmd.colour, {0.0F, 1.0F}},
+														{{xPos, yPos}, textCmd.colour, {0.0F, 0.0F}},
+														{{xPos + w, yPos}, textCmd.colour, {1.0F, 0.0F}},
+														{{xPos, yPos + h}, textCmd.colour, {0.0F, 1.0F}},
+														{{xPos + w, yPos}, textCmd.colour, {1.0F, 0.0F}},
+														{{xPos + w, yPos + h}, textCmd.colour, {1.0F, 1.0F}},
+													}};
+				m_vertexList.replace(verts.size(), verts.data());
+
+				m_vao.bind();
+				m_vao.draw(ogl::Primitive::TRIANGLE, 0, verts.size());
+
+				penPos.x += (metrics.advance >> 6);
+			}
+
+			// textures assume they own their contained data, we need to make sure we clear it
+			tex.data = nullptr;
+		}
+
+		glDisable(GL_BLEND);
+		glEnable(GL_DEPTH_TEST);
+	}
+
+	/*
+	void renderTextWIP(const Paint& paint, GLuint shader) {
+
+		if ( paint.textCmds().empty() ) {
+			return;
+		}
+
+		auto fontFactory = util::ServiceLocator::instance().get<gui::FontLibrary>();
+		std::shared_ptr<gui::FontFace> face = fontFactory->getFont("LiberationSans-Regular.ttf");
+		if ( face == nullptr ){
+			return;
+		}
+
+		Paint textPaint;
+		for ( const auto& textCmd : paint.textCmds() ) {
+			auto label = textCmd.text;
+
+			gfx::Path2D textPath(textCmd.pos);
+			math::vec2 penPos(textCmd.pos);
+
+			// create a quad for this character
+			for (auto letter : label) {
+				auto& metrics = face->metrics(letter);
+
+				std::cerr << metrics.size.x << std::endl;
+
+				make_box(textPath, penPos, penPos + metrics.size);
+				penPos.x += (metrics.advance >> 6 );
+			}
+
+			textPaint.fill(textPath);
+		}
+
+		data::Mesh2D mesh;
+		convert_to_mesh(textPaint, mesh);
+
+		// render the text mesh
+		m_vao.bind();
+		m_vertexList.replace(mesh.vertexList.size(), mesh.vertexList.data());
+		m_indexList.replace(mesh.indexList.size(), mesh.indexList.data());
+
+		// draw
+		glUseProgram( shader );
+		auto projMat = glm::ortho(0.0f, 1920.0f, 1080.0f, 0.f);
+		glUniformMatrix4fv(glGetUniformLocation( shader, "projection"), 1, GL_FALSE,
+						   glm::value_ptr(projMat));
+
+		m_vao.drawElements(m_indexList, ogl::Primative::TRIANGLE, mesh.indexList.size());
+		glUseProgram( 0 );
+	}*/
+
+	void CanvasRenderer::render(ogl::Shader& shader, const gfx::Paint &paint) {
+		renderShapes(paint, shader);
+		renderText(paint, shader);
+	}
+
+}

fggl/gfx/ogl4/debug.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 30/05/22.
+//
+
+#include "fggl/debug/draw.hpp"
+#include "fggl/gfx/ogl/types.hpp"
+#include "fggl/gfx/ogl4/debug.hpp"
+
+#include <cassert>
+#include <utility>
+
+namespace fggl::gfx::ogl4 {
+
+	DebugRenderer::DebugRenderer(std::shared_ptr<ogl::Shader> shader) :
+		mvpMatrix(1.0F),
+		m_lineShader(std::move(shader)),
+		m_lineShaderMVP(m_lineShader->uniform("u_MvpMatrix")) {
+		// define our attributes
+		auto posAttr = ogl::attribute<dd::DrawVertex, math::vec3>(0);
+		auto colAttr = ogl::attribute<dd::DrawVertex, math::vec3>(sizeof(float) * 3);
+
+		// bind the attributes to the vao
+		m_lineVao.setAttribute(m_lineVbo, 0, posAttr);
+		m_lineVao.setAttribute(m_lineVbo, 1, colAttr);
+	}
+
+	void DebugRenderer::drawLineList(const dd::DrawVertex *lines, int count, bool depthEnabled) {
+		assert(lines != nullptr);
+		assert(count > 0 && count <= DEBUG_DRAW_VERTEX_BUFFER_SIZE);
+
+		m_lineVao.bind();
+		m_lineShader->use();
+		m_lineShader->setUniformMtx(m_lineShaderMVP, mvpMatrix);
+
+		if (depthEnabled) {
+			glEnable(GL_DEPTH_TEST);
+		} else {
+			glDisable(GL_DEPTH_TEST);
+		}
+
+		m_lineVbo.bind();
+		m_lineVbo.replace<dd::DrawVertex>(count, lines);
+
+		m_lineVao.draw(ogl::Primitive::LINE, 0, count);
+
+		glUseProgram(0);
+		glBindVertexArray(0);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+	}
+
+} // namespace fggl::gfx::ogl4
\ No newline at end of file

fggl/gfx/ogl4/meshes.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/gfx/ogl4/meshes.hpp"
+#include "fggl/gfx/phong.hpp"
+
+#include "fggl/data/texture.hpp"
+
+//
+// Created by webpigeon on 22/10/22.
+//
+
+namespace fggl::gfx::ogl4 {
+
+	static auto setup_array_buffer(std::shared_ptr<ogl::VertexArray> &vao,
+															  const std::vector<mesh::Vertex3D> &data) -> std::shared_ptr<ogl::ArrayBuffer> {
+		// upload the data to the GPU
+		auto buff = std::make_shared<ogl::ArrayBuffer>();
+		buff->write(data.size() * sizeof(mesh::Vertex3D), data.data(), ogl::BufUsage::STATIC_DRAW);
+
+		// set up the vertex attributes
+		auto posAttr = ogl::attribute<mesh::Vertex3D, math::vec3>(offsetof(mesh::Vertex3D, position));
+		auto normalAttr = ogl::attribute<mesh::Vertex3D, math::vec3>(offsetof(mesh::Vertex3D, normal));
+		auto colAttr = ogl::attribute<mesh::Vertex3D, math::vec3>(offsetof(mesh::Vertex3D, colour));
+		auto texAttr = ogl::attribute<mesh::Vertex3D, math::vec2>(offsetof(mesh::Vertex3D, texPos));
+
+		vao->setAttribute(*buff, 0, posAttr);
+		vao->setAttribute(*buff, 1, normalAttr);
+		vao->setAttribute(*buff, 2, colAttr);
+		vao->setAttribute(*buff, 3, texAttr);
+
+		return buff;
+	}
+
+	static auto setup_index_buffer(const std::vector<uint32_t>& data) -> std::shared_ptr<ogl::ElementBuffer> {
+		auto elementBuffer = std::make_shared<ogl::ElementBuffer>();
+		elementBuffer->write(data.size() * sizeof(uint32_t),
+							 data.data(), ogl::BufUsage::STATIC_DRAW);
+		return elementBuffer;
+	}
+
+	void setup_material(const std::shared_ptr<ogl::Shader>& shader, const PhongMaterial* material) {
+		if ( !shader->hasUniform("material.ambient") ) {
+			return;
+		}
+
+		// setup material block
+		shader->setUniformF(shader->uniform("material.emission"), material->emission);
+		shader->setUniformF(shader->uniform("material.ambient"), material->ambient);
+		shader->setUniformF(shader->uniform("material.diffuse"), material->diffuse);
+		shader->setUniformF(shader->uniform("material.specular"), material->specular);
+		//shader->setUniformF(shader->uniform("material.shininess"), material->shininess);
+	}
+
+	void setup_material(const std::shared_ptr<ogl::Shader>& shader, const Material* material) {
+		if ( shader->hasUniform("material.diffuse") ) {
+			// setup material block
+//			shader->setUniformF(shader->uniform("material.emission"), material->emission);
+//			shader->setUniformF(shader->uniform("material.ambient"), material->ambient);
+			shader->setUniformF(shader->uniform("material.diffuse"), material->m_diffCol);
+			shader->setUniformF(shader->uniform("material.specular"), material->m_specCol);
+		}
+
+
+		// setup diffuse texture
+		if (material->m_diffuse != nullptr) {
+			material->m_diffuse->bind(0);
+			if (shader->hasUniform("diffuseTexture")) {
+				shader->setUniformI(shader->uniform("diffuseTexture"), 0);
+			}
+		}
+
+		// setup specular texture
+		if (material->m_specular != nullptr) {
+			material->m_specular->bind(1);
+			if (shader->hasUniform("specularTexture")) {
+				shader->setUniformI(shader->uniform("specularTexture"), 1);
+			}
+		}
+		//shader->setUniformF(shader->uniform("material.shininess"), material->shininess);
+	}
+
+
+	void MeshData::draw(std::shared_ptr<ogl::Shader> shader) const {
+		vao->bind();
+		vertexData->bind();
+
+		if ( material != nullptr ) {
+			setup_material(shader, material);
+		} else {
+			debug::info("no material is active, cannot bind textures!");
+		}
+
+		if ( drawInfo.restartIndex != ogl::NO_RESTART_IDX) {
+			glEnable(GL_PRIMITIVE_RESTART);
+			glPrimitiveRestartIndex( drawInfo.restartIndex );
+		}
+
+		vao->drawElements(*elements, drawInfo.mode, elementCount);
+
+		if ( drawInfo.restartIndex != ogl::NO_RESTART_IDX ) {
+			glDisable(GL_PRIMITIVE_RESTART);
+		}
+	}
+
+	void StaticMultiMesh::draw() const {
+		for ( const auto& mesh : meshes ) {
+			mesh.draw(pipeline);
+		}
+	}
+
+	void setup_lighting(const std::shared_ptr<ogl::Shader>& shader, const DirectionalLight* light) {
+		assert( light != nullptr );
+		if ( !shader->hasUniform("light.direction") ) {
+			fggl::debug::warning("asked for directional lighting, but shader does not support!");
+			return;
+		}
+
+		shader->setUniformF( shader->uniform("light.direction"), light->position);
+		shader->setUniformF( shader->uniform("light.ambient"), light->ambient);
+		shader->setUniformF( shader->uniform("light.diffuse"), light->diffuse);
+		shader->setUniformF( shader->uniform("light.specular"), light->specular);
+	}
+
+	void setup_lighting(const std::shared_ptr<ogl::Shader>& shader, const math::mat4& viewMatrix, const math::Transform& camTransform, const math::Transform& transform, math::vec3 lightPos) {
+		if (shader->hasUniform("lightPos")) {
+			shader->setUniformF(shader->uniform("lightPos"), lightPos);
+		}
+
+		if ( !shader->hasUniform("lights[0].isEnabled") ) {
+			return;
+		}
+
+		bool local = true;
+
+		shader->setUniformI(shader->uniform("lights[0].isEnabled"), 1);
+		shader->setUniformI(shader->uniform("lights[0].isLocal"), local);
+		shader->setUniformI(shader->uniform("lights[0].isSpot"), 0);
+
+		shader->setUniformF(shader->uniform("lights[0].constantAttenuation"), 5.0F);
+		shader->setUniformF(shader->uniform("lights[0].linearAttenuation"), 0.0F);
+		shader->setUniformF(shader->uniform("lights[0].quadraticAttenuation"), 0.0F);
+
+		shader->setUniformF(shader->uniform("Strength"), 0.6F);
+
+		if (!local) {
+			lightPos = glm::normalize(lightPos);
+			auto viewDir = glm::normalize(camTransform.origin() - transform.origin());
+			auto halfVector = glm::normalize(lightPos + viewDir);
+			shader->setUniformF(shader->uniform("lights[0].halfVector"), halfVector);
+			shader->setUniformF(shader->uniform("EyeDirection"), viewDir);
+			shader->setUniformF(shader->uniform("lights[0].position"), lightPos);
+		} else {
+			auto camModelView = (viewMatrix * camTransform.model() * math::vec4(0.0F, 0.0F, 0.0F, 1.0F));
+			auto modelModelView = (viewMatrix * transform.model() * math::vec4(0.0F, 0.0F, 0.0F, 1.0F));
+			math::vec3 viewDir = glm::normalize(camModelView - modelModelView);
+			shader->setUniformF(shader->uniform("EyeDirection"), viewDir);
+
+			shader->setUniformF(shader->uniform("lights[0].position"),
+								math::vec3(viewMatrix * math::vec4(lightPos, 1.0F)));
+		}
+
+		shader->setUniformF(shader->uniform("lights[0].ambient"), {0.0F, 0.5F, 0.0F});
+		shader->setUniformF(shader->uniform("lights[0].colour"), {0.5F, 0.5F, 0.5F});
+	}
+
+	static auto upload_texture( assets::AssetID name, assets::AssetManager* manager ) -> ogl::Texture* {
+		debug::info("loading texture: {}", name.get());
+
+		auto uploadedTex = assets::make_asset_id_rt("ogl", std::to_string(name.get()) );
+		auto* texture = manager->get<ogl::Texture>( uploadedTex );
+		if ( texture != nullptr ) {
+			return texture;
+		}
+
+		// get the texture data we plan to load
+		auto *textureData = manager->get<data::Texture2D>(name);
+
+		// create a texture
+		texture = new ogl::Texture(ogl::TextureType::Tex2D);
+		texture->setData( ogl::InternalImageFormat::RedGreenBlue, textureData);
+
+		return manager->set(uploadedTex, texture);
+	}
+
+	static auto get_fallback_material(assets::AssetManager* manager) -> Material* {
+		auto* fallback = manager->get<Material>(FALLBACK_MAT);
+		if ( fallback != nullptr ) {
+			return fallback;
+		}
+
+		auto* mat = new Material();
+		mat->m_diffCol = FALLBACK_COLOUR;
+		mat->m_specCol= FALLBACK_COLOUR;
+
+		mat->m_diffuse = manager->get<ogl::Texture>(FALLBACK_TEX);
+		mat->m_specular = manager->get<ogl::Texture>(FALLBACK_TEX);
+		mat->m_normals = manager->get<ogl::Texture>(SOLID_TEX);
+		return manager->set(FALLBACK_MAT, mat);
+	}
+
+	static auto upload_material( assets::AssetID name, assets::AssetManager* manager ) -> Material* {
+		auto* meshMaterial = manager->get<mesh::Material>(name);
+		if ( meshMaterial == nullptr ){
+			debug::error("attempted to load material {}, but did not exist!", name.get());
+			return get_fallback_material(manager);
+		}
+
+		auto uploadedMat = assets::make_asset_id_rt("ogl", std::to_string(name.get()) );
+		auto* material = manager->get<Material>( uploadedMat );
+		if ( material != nullptr ) {
+			return material;
+		}
+
+		material = new Material();
+		material->m_diffCol = meshMaterial->diffuse;
+		material->m_specCol = meshMaterial->specular;
+
+		// do we have a diffuse texture?
+		if ( !meshMaterial->diffuseTextures.empty() ) {
+			material->m_diffuse = upload_texture(meshMaterial->getPrimaryDiffuse(), manager);
+		} else {
+			material->m_diffuse = manager->get<ogl::Texture>( ogl4::SOLID_TEX );
+		}
+
+		// do we have a normal Texture?
+		if ( !meshMaterial->normalTextures.empty() ) {
+			material->m_normals = upload_texture(meshMaterial->getPrimaryNormals(), manager);
+		} else {
+			material->m_normals = manager->get<ogl::Texture>( ogl4::SOLID_TEX );
+		}
+
+		// do we have a specular texture?
+		if ( !meshMaterial->specularTextures.empty() ) {
+			material->m_specular = upload_texture(meshMaterial->getPrimarySpecular(), manager);
+		} else {
+			material->m_specular = manager->get<ogl::Texture>( ogl4::SOLID_TEX );
+		}
+
+		return manager->set( uploadedMat, material);
+	}
+
+	auto upload_mesh(const mesh::Mesh3D& rawMesh, assets::AssetManager* manager) -> MeshData {
+		auto vao = std::make_shared<ogl::VertexArray>();
+		return {
+			.vao = vao,
+			.elements = setup_index_buffer( rawMesh.indices ),
+			.vertexData = setup_array_buffer(vao, rawMesh.data ),
+			.elementCount = rawMesh.indices.size(),
+			.drawInfo = { .mode = ogl::Primitive::TRIANGLE },
+			.material = upload_material( rawMesh.material, manager )
+		};
+	}
+
+	auto upload_multi_mesh(const mesh::MultiMesh3D& rawMesh, assets::AssetManager* manager) -> std::vector<MeshData> {
+		std::vector<MeshData> gpuMeshes;
+		for (const auto& mesh : rawMesh.meshes) {
+			gpuMeshes.push_back( upload_mesh(mesh, manager) );
+		}
+		return gpuMeshes;
+	}
+
+}

fggl/gfx/ogl4/models.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 18/04/22.
+//
+
+#include "fggl/gfx/ogl4/models.hpp"
+#include "fggl/gfx/ogl4/meshes.hpp"
+
+#include "fggl/data/heightmap.hpp"
+#include "fggl/data/texture.hpp"
+
+#include "fggl/debug/logging.hpp"
+#include "fggl/gfx/camera.hpp"
+#include "fggl/gfx/phong.hpp"
+
+namespace fggl::gfx::ogl4 {
+
+	static auto setup_array_buffer(std::shared_ptr<ogl::VertexArray> &vao,
+															  const std::vector<data::Vertex> &data) -> std::shared_ptr<ogl::ArrayBuffer> {
+		auto buff = std::make_shared<ogl::ArrayBuffer>();
+		buff->write(data.size() * sizeof(data::Vertex), data.data(), ogl::BufUsage::STATIC_DRAW);
+
+		// set up the vertex attributes
+		auto posAttr = ogl::attribute<data::Vertex, math::vec3>(offsetof(data::Vertex, posititon));
+		auto normalAttr = ogl::attribute<data::Vertex, math::vec3>(offsetof(data::Vertex, normal));
+		auto colAttr = ogl::attribute<data::Vertex, math::vec3>(offsetof(data::Vertex, colour));
+
+		vao->setAttribute(*buff, 0, posAttr);
+		vao->setAttribute(*buff, 1, normalAttr);
+		vao->setAttribute(*buff, 2, colAttr);
+		return buff;
+	}
+
+
+	static auto setup_index_buffer(std::shared_ptr<ogl::VertexArray> &vao,
+																const std::vector<uint32_t> &data) -> std::shared_ptr<ogl::ElementBuffer> {
+		auto elementBuffer = std::make_shared<ogl::ElementBuffer>();
+		elementBuffer->write(data.size() * sizeof(uint32_t),
+							 data.data(), ogl::BufUsage::STATIC_DRAW);
+		return elementBuffer;
+	}
+
+	static void setup_component(StaticModel &modelComp, std::shared_ptr<ogl::Shader> &shader, data::Mesh &mesh) {
+		auto vao = std::make_shared<ogl::VertexArray>();
+		auto meshBuffer = setup_array_buffer(vao, mesh.vertexList());
+		auto elementBuffer = setup_index_buffer(vao, mesh.indexList());
+
+		// set up the element attributes
+		modelComp.vao = vao;
+		modelComp.vertexData = meshBuffer;
+		modelComp.elements = elementBuffer;
+		modelComp.pipeline = shader;
+		modelComp.elementCount = mesh.indexCount();
+		modelComp.drawType = ogl::Primitive::TRIANGLE;
+	}
+
+	auto StaticModelRenderer::uploadMesh(assets::AssetID guid, const data::Mesh &mesh, bool allowCache) -> StaticModel* {
+		assert( m_assets != nullptr );
+
+		// if the asset has already been uploaded, we don't need to do anything
+		if ( allowCache && m_assets->has(guid) ) {
+			m_assets->require(guid);
+			return m_assets->get<StaticModel>(guid);
+		}
+
+		// the asset does not exist, we need to upload it
+		auto* modelAsset = new StaticModel();
+		modelAsset->vao = std::make_shared<ogl::VertexArray>();
+		modelAsset->vertexData = setup_array_buffer(modelAsset->vao, mesh.vertexList());
+		modelAsset->elements = setup_index_buffer(modelAsset->vao, mesh.indexList());
+		modelAsset->elementCount = mesh.indexCount();
+		modelAsset->drawType = ogl::Primitive::TRIANGLE;
+
+		// if caching is enabled, then use the cache
+		if ( allowCache ) {
+			m_assets->set(guid, modelAsset);
+		}
+
+		return modelAsset;
+	}
+
+	/*MeshData* StaticModelRenderer::uploadMesh(assets::AssetGUID guid, const mesh::Mesh3D &mesh, bool allowCache) {
+		assert( m_assets != nullptr );
+
+		// if the asset has already been uploaded, we don't need to do anything
+		if ( allowCache && m_assets->has(guid) ) {
+			m_assets->require(guid);
+			return m_assets->get<MeshData>(guid);
+		}
+
+		// the asset does not exist, we need to upload it
+		auto* modelAsset = new MeshData();
+		modelAsset->vao = std::make_shared<ogl::VertexArray>();
+		modelAsset->vertexData = setupArrayBuffer(modelAsset->vao, mesh.data);
+		modelAsset->elements = setupIndexBuffer(modelAsset->vao, mesh.indices);
+		modelAsset->elementCount = mesh.indices.size();
+		modelAsset->drawInfo.mode = ogl::Primitive::TRIANGLE;
+
+		// if caching is enabled, then use the cache
+		if ( allowCache ) {
+			m_assets->set(guid, modelAsset);
+		}
+
+		return modelAsset;
+	}*/
+
+	auto StaticModelRenderer::uploadMesh2(const assets::AssetID& meshName, const data::Mesh &mesh) -> StaticModelGPU* {
+		assert( m_assets != nullptr );
+
+		if ( m_assets->has(meshName) ) {
+			// we've already uploaded it...
+			return m_assets->get<StaticModelGPU>(meshName);
+		}
+
+		auto* modelAsset = new StaticModelGPU();
+		modelAsset->vao = std::make_shared<ogl::VertexArray>();
+		modelAsset->vertices = setup_array_buffer(modelAsset->vao, mesh.vertexList());
+		modelAsset->elements = setup_index_buffer(modelAsset->vao, mesh.indexList());
+		modelAsset->elementCount = mesh.indexCount();
+		modelAsset->drawType = ogl::Primitive::TRIANGLE;
+
+		return m_assets->set(meshName, modelAsset);
+	}
+
+	#ifdef FGGL_ALLOW_DEFERRED_UPLOAD
+		static void setup_meshes(entity::EntityManager& world, ShaderCache* shaders, assets::AssetManager* manager) {
+			auto entsWithModels = world.find<mesh::StaticMesh3D>();
+			for ( const auto& mesher : entsWithModels ) {
+
+				// check if this entity already has a mesh...
+				const auto* currModel = world.tryGet<StaticMesh>(mesher);
+				if ( currModel != nullptr ) {
+					continue;
+				}
+
+				// figure out the requirements
+				auto& rawMesh = world.get<mesh::StaticMesh3D>(mesher);
+				if ( rawMesh.guid != util::make_guid("__NO_CACHE__") ){
+					// TODO support fetching of loaded meshes
+					debug::warning("multiple entities sharing a mesh has not been implemented yet...");
+				}
+
+				auto& entityMesh = world.add<StaticMesh>(mesher);
+				entityMesh.pipeline = shaders->get( rawMesh.pipeline );
+				entityMesh.mesh = upload_mesh( rawMesh.mesh, manager );
+
+			}
+		}
+
+		static void setup_multi_meshes(entity::EntityManager& world, ShaderCache* shaders, assets::AssetManager* manager) {
+			auto entsWithModels = world.find<mesh::StaticMultiMesh3D>();
+			for ( const auto& mesher : entsWithModels ) {
+
+				// check if this entity already has a mesh...
+				const auto* currModel = world.tryGet<StaticMultiMesh>(mesher);
+				if ( currModel != nullptr ) {
+					continue;
+				}
+
+				// figure out the requirements
+				auto& multiMesh = world.get<mesh::StaticMultiMesh3D>(mesher);
+				if ( multiMesh.guid != util::make_guid("__NO_CACHE__") ){
+					// TODO support fetching of loaded meshes
+					debug::warning("multiple entities sharing a mesh has not been implemented yet...");
+				}
+
+				auto& entityMesh = world.add<StaticMultiMesh>(mesher);
+				entityMesh.pipeline = shaders->get( multiMesh.pipeline );
+				entityMesh.meshes = upload_multi_mesh(multiMesh.mesh, manager);
+				//entityMesh.material = setup_material( multiMesh.mesh.materials[0], manager);
+			}
+		}
+
+		void StaticModelRenderer::resolveModels(entity::EntityManager &world) {
+			// new mesh formats
+			setup_meshes(world, m_shaders, m_assets);
+			setup_multi_meshes(world, m_shaders, m_assets);
+
+			// terrain
+			auto terrain = world.find<data::HeightMap>();
+			for (const auto &renderable : terrain) {
+				auto *currModel = world.tryGet<StaticModel>(renderable);
+				if (currModel != nullptr) {
+					continue;
+				}
+
+				auto &heightmap = world.get<data::HeightMap>(renderable);
+				data::Mesh heightMapMesh{};
+				data::generateHeightMesh(heightmap, heightMapMesh);
+
+				auto &modelComp = world.add<StaticModel>(renderable);
+				setup_component(modelComp, m_phong, heightMapMesh);
+
+				// we know this is a triangle strip with a restart vertex...
+				// FIXME the model should be telling us this...
+				modelComp.drawType = ogl::Primitive::TRIANGLE_STRIP;
+				modelComp.restartIndex = heightMapMesh.restartVertex;
+
+				// no active model, we need to resolve/load one.
+				debug::info("looks like {} needs a static mesh", (uint64_t)renderable);
+			}
+		}
+	#endif
+
+
+	void StaticModelRenderer::renderModelsForward(const entity::EntityManager &world, bool debugMode) {
+
+		// fetch cameras we will need to render with
+		auto cameras = world.find<gfx::Camera>();
+
+		// if there are no cameras, we can't do anything...
+		if (cameras.empty()) {
+			debug::warning("asked to render static models, but there were no cameras");
+			return;
+		}
+
+		// perform a rendering pass for each camera (will usually only be one...)
+		for (const auto &cameraEnt : cameras) {
+			//TODO should be clipping this to only visible objects
+			//forward_camera_pass(cameraEnt, world);
+
+			forward_pass<ogl4::StaticMesh>(cameraEnt, world, m_assets);
+			forward_pass<ogl4::StaticMultiMesh>(cameraEnt, world, m_assets);
+
+			// enable rendering normals
+			if ( debugMode ) {
+				auto normalShader = m_shaders->get("normals");
+				forward_pass_normals<StaticMesh>(cameraEnt, world, normalShader);
+				forward_pass_normals<StaticMultiMesh>(cameraEnt, world, normalShader);
+				//forward_normal_pass(cameraEnt, world, normalShader);
+			}
+		}
+	}
+
+}

fggl/gfx/ogl4/module.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 24/07/22.
+//
+
+#include "fggl/gfx/ogl4/module.hpp"
+#include "fggl/gfx/phong.hpp"
+#include "fggl/mesh/components.hpp"
+#include "fggl/data/procedural.hpp"
+
+#include "fggl/assets/loader.hpp"
+#include <string>
+
+namespace fggl::gfx {
+
+	constexpr uint32_t DEFAULT_STACKS = 16;
+	constexpr uint32_t DEFAULT_SLICES = 16;
+	constexpr const char *SHAPE_SPHERE{"sphere"};
+	constexpr const char *SHAPE_BOX{"box"};
+
+	namespace {
+		void process_shape(const YAML::Node &node, mesh::Mesh3D &mesh) {
+			auto transform = data::OFFSET_NONE;
+
+			auto offset = node["offset"].as<math::vec3>(math::VEC3_ZERO);
+			transform = glm::translate(transform, offset);
+
+			auto scale = node["scale"].as<math::vec3>(math::VEC3_ONES);
+			transform = glm::scale(transform, scale);
+			debug::debug("scale: {}, {}, {}", scale.x, scale.y, scale.z);
+
+			// now the shape itself
+			auto type = node["type"].as<std::string>();
+			if (type == SHAPE_BOX) {
+				data::make_cube(mesh, transform);
+			} else if (type == SHAPE_SPHERE) {
+				auto stacks = node["stacks"].as<uint32_t>(DEFAULT_STACKS);
+				auto slices = node["slices"].as<uint32_t>(DEFAULT_SLICES);
+				data::make_sphere(mesh, transform, stacks, slices);
+			} else {
+				debug::log(debug::Level::warning, "unknown shape type requested: {}", type);
+			}
+		}
+	}
+
+
+	void attach_mesh(const entity::ComponentSpec &spec, entity::EntityManager &manager, const entity::EntityID &id, modules::Services &services) {
+
+		// check for the asset service
+		auto* assetService = services.get<assets::AssetManager>();
+		auto* assetLoader = services.get<assets::Loader>();
+		if ( assetService == nullptr || assetLoader == nullptr ) {
+			// no asset service, give up
+			return;
+		}
+
+		// asset is a procedural mesh description
+		if (spec.has("shape")) {
+			auto pipeline = spec.get<std::string>("pipeline", "");
+
+			// check if we had previously loaded this asset
+			/*const auto shapeName = spec.get<std::string>("shape_id", "");
+			if ( !shapeName.empty() ) {
+				meshAsset = assetService->get<data::Mesh>(shapeName);
+			}*/
+
+			// we've not loaded this before - generate mesh
+			if ( true ) {
+
+				// procedural meshes are build as static meshes first
+				if (spec.config["shape"].IsSequence()) {
+					mesh::MultiMesh3D* multiMesh;
+
+					for (const auto &node : spec.config["shape"]) {
+						auto* meshAsset = new mesh::Mesh3D();
+						process_shape(node, *meshAsset);
+						multiMesh->meshes.push_back(*meshAsset);
+						delete meshAsset;
+					}
+
+					#ifdef FGGL_ALLOW_DEFERRED_UPLOAD
+						// the graphics stack can detect static meshes without a rendering proxy at runtime and fix it but this
+						// requires loading the whole model into the ECS (and should be removed in the future). instead we should
+						// be triggering the upload at this point (if needed).
+						auto &entityMesh = manager.add<mesh::StaticMultiMesh3D>(id);
+						entityMesh.mesh = *multiMesh;
+						entityMesh.pipeline = pipeline;
+						debug::warning("HACKY: Triggered proc mesh - using deferred upload");
+					#endif
+
+				} else {
+					auto* meshAsset = new mesh::Mesh3D();
+					process_shape(spec.config["shape"], *meshAsset);
+
+					#ifdef FGGL_ALLOW_DEFERRED_UPLOAD
+						// the graphics stack can detect static meshes without a rendering proxy at runtime and fix it but this
+						// requires loading the whole model into the ECS (and should be removed in the future). instead we should
+						// be triggering the upload at this point (if needed).
+						auto &entityMesh = manager.add<mesh::StaticMesh3D>(id);
+						entityMesh.mesh = *meshAsset;
+						entityMesh.pipeline = pipeline;
+						debug::warning("HACKY: Triggered proc mesh - using deferred upload");
+					#endif
+				}
+
+				//assetService->set(shapeName, meshTmp);
+			}
+
+			// TODO we need to trigger an upload to the GPU (somehow)
+
+			return;
+		}
+
+		// asset is a model from the resource cache
+		if ( spec.has("model") ) {
+			// figure out what model we want
+			auto assetStr = spec.get<std::string>("model", "");
+			auto assetId = assets::asset_from_user( assetStr );
+
+			auto* asset = assetService->get<ogl4::StaticModel>(assetId);
+
+			if ( asset == nullptr ) {
+				// the asset is not loaded/does not exist
+				debug::error("requested model {} but it was not loaded.", assetStr);
+				return;
+			}
+
+			// copy the asset to the model
+			auto& model = manager.add<ogl4::StaticModel>(id);
+			model = *asset;
+		}
+	}
+
+	void attach_material(const entity::ComponentSpec &spec,
+						 entity::EntityManager &manager,
+						 const entity::EntityID &id,
+						 modules::Services& /*services*/ ) {
+		auto &mat = manager.add<gfx::PhongMaterial>(id);
+		mat.ambient = spec.get<math::vec3>("ambient", gfx::DEFAULT_AMBIENT);
+		mat.diffuse = spec.get<math::vec3>("diffuse", gfx::DEFAULT_DIFFUSE);
+		mat.specular = spec.get<math::vec3>("ambient", gfx::DEFAULT_SPECULAR);
+		mat.shininess = spec.get<float>("ambient", gfx::DEFAULT_SHININESS);
+	}
+
+	void attach_light_directional(const entity::ComponentSpec &spec, entity::EntityManager &manager, const entity::EntityID &id, modules::Services& /*services*/) {
+		auto &light = manager.add<gfx::DirectionalLight>(id);
+		light.position = spec.get<math::vec3>("direction", -math::UP);
+		light.ambient = spec.get<math::vec3>("ambient", gfx::colours::WHITE);
+		light.specular = spec.get<math::vec3>("specular", gfx::colours::WHITE);
+		light.diffuse = spec.get<math::vec3>("diffuse", gfx::colours::WHITE);
+	}
+
+	void attach_light_point(const entity::ComponentSpec &spec, entity::EntityManager &manager, const entity::EntityID &id, modules::Services& /*services*/) {
+		auto &light = manager.add<gfx::PointLight>(id);
+		light.position = spec.get<math::vec3>("position", math::VEC3_ZERO);
+
+		light.constant = spec.get<float>("constant", 1.0F);
+		light.linear = spec.get<float>("linear", 0.0014F);
+		light.quadratic = spec.get<float>("quadratic", 0.000007F);
+	}
+
+	auto OpenGL4::factory(modules::ServiceName service, modules::Services &services) -> bool {
+		if (service == WindowGraphics::service) {
+			// setup the thing responsible for graphics
+			auto *storage = services.get<data::Storage>();
+			auto *fontLibrary = services.get<gui::FontLibrary>();
+			auto *assets = services.get<assets::AssetManager>();
+			services.bind<WindowGraphics, ogl4::WindowGraphics>(storage, fontLibrary, assets);
+
+			// register as responsible for creating rendering components
+			auto *entityFactory = services.get<entity::EntityFactory>();
+			entityFactory->bind(data::StaticMesh::guid, attach_mesh);
+			entityFactory->bind(mesh::StaticMesh3D::guid, attach_mesh);
+			entityFactory->bind(mesh::StaticMultiMesh3D::guid, attach_mesh);
+			entityFactory->bind(gfx::PhongMaterial::guid, attach_material);
+
+			entityFactory->bind(gfx::DirectionalLight::guid, attach_light_directional);
+			entityFactory->bind(gfx::PointLight::guid, attach_light_point);
+
+			return true;
+		}
+		return false;
+	}
+
+} // namespace fggl::gfX::ogl4
\ No newline at end of file