From 28e5527da25d8a0b7a6a8a5d9eedc5e18ace47d4 Mon Sep 17 00:00:00 2001
From: Joseph Walton-Rivers <joseph@walton-rivers.uk>
Date: Sun, 18 Jul 2021 17:28:00 +0100
Subject: [PATCH] add event-based input handling code
---
demo/main.cpp | 45 ++++++++-------------
fggl/CMakeLists.txt | 2 +-
fggl/gfx/input.cpp | 97 ++++++++++++++++++++++++++++++++++++++++++++
fggl/gfx/input.hpp | 99 +++++++++++++++++++++++++++++++++++++++++++++
fggl/gfx/window.cpp | 42 ++++++++++++++++++-
fggl/gfx/window.hpp | 17 +++++---
6 files changed, 265 insertions(+), 37 deletions(-)
create mode 100644 fggl/gfx/input.cpp
create mode 100644 fggl/gfx/input.hpp
diff --git a/demo/main.cpp b/demo/main.cpp
index 83211bb..2c168f7 100644
--- a/demo/main.cpp
+++ b/demo/main.cpp
@@ -41,24 +41,8 @@ void discover(std::filesystem::path base) {
}
-struct InputState {
- double currCursor[2];
- double lastCursor[2];
- bool buttons[3];
-};
-
-void process_inputs(fggl::gfx::Window& window, InputState& state) {
- state.lastCursor[0] = state.currCursor[0];
- state.lastCursor[1] = state.currCursor[1];
- glfwGetCursorPos(window.handle(), &state.currCursor[0], &state.currCursor[1]);
-
- state.buttons[0] = glfwGetMouseButton(window.handle(), GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS;
- state.buttons[1] = glfwGetMouseButton(window.handle(), GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS;
- state.buttons[2] = glfwGetMouseButton(window.handle(), GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS;
-}
-
//TODO proper input system
-void process_camera(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, InputState& state, fggl::ecs::entity_t cam) {
+void process_camera(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, fggl::gfx::Input& input, fggl::ecs::entity_t cam) {
auto camTransform = ecs.getComponent<fggl::math::Transform>(cam);
auto camComp = ecs.getComponent<fggl::gfx::Camera>(cam);
float moveSpeed = 1.0f;
@@ -77,14 +61,16 @@ void process_camera(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, InputState&
motion += (forward * moveSpeed);
}
}
- if ( glfwGetKey( window.handle(), GLFW_KEY_A ) == GLFW_PRESS ) {
-
- }
+
+ // scroll wheel
+ float delta = (float)input.scrollDeltaY();
+ if ( (glm::length( dir ) < 25.0f && delta < 0.0f) || (glm::length( dir ) > 2.5f && delta > 0.0f) )
+ motion -= (forward * delta);
camTransform->origin( camTransform->origin() + motion );
}
-void process_arcball(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, InputState& state, fggl::ecs::entity_t cam) {
+void process_arcball(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, fggl::gfx::Input& input, fggl::ecs::entity_t cam) {
// see https://asliceofrendering.com/camera/2019/11/30/ArcballCamera/
auto camTransform = ecs.getComponent<fggl::math::Transform>(cam);
auto camComp = ecs.getComponent<fggl::gfx::Camera>(cam);
@@ -97,8 +83,8 @@ void process_arcball(fggl::gfx::Window& window, fggl::ecs::ECS& ecs, InputState&
float deltaAngleX = ( 2 * M_PI / window.width() );
float deltaAngleY = ( M_PI / window.height() );
- float xAngle = ( state.lastCursor[0] - state.currCursor[0] ) * deltaAngleX;
- float yAngle = ( state.lastCursor[1] - state.currCursor[1] ) * deltaAngleY;
+ float xAngle = ( input.cursorDeltaX() ) * deltaAngleX;
+ float yAngle = ( input.cursorDeltaY() ) * deltaAngleY;
auto cosAngle = glm::dot( viewDir, fggl::math::UP );
if ( cosAngle * sgn(deltaAngleY) > 0.99f ) {
@@ -122,7 +108,7 @@ int main(int argc, char* argv[]) {
fggl::gfx::Context ctx;
// build our main window
- fggl::gfx::Window win;
+ fggl::gfx::Window win( fggl::gfx::Input::instance() );
win.fullscreen( true );
// opengl time
@@ -206,21 +192,22 @@ int main(int argc, char* argv[]) {
ecs.addComponent<fggl::gfx::MeshToken>(entity, token);
}
- InputState inputs;
+ fggl::gfx::Input& input = fggl::gfx::Input::instance();
float time = 0.0f;
float dt = 16.0f;
while( !win.closeRequested() ) {
+ input.frame();
+
ctx.pollEvents();
debug.frameStart();
// update step
time += dt;
- process_inputs(win, inputs);
- process_camera(win, ecs, inputs, camEnt);
- if ( inputs.buttons[2] ) {
- process_arcball(win, ecs, inputs, camEnt);
+ process_camera(win, ecs, input, camEnt);
+ if ( input.mouseDown( fggl::gfx::MOUSE_2 ) ) {
+ process_arcball(win, ecs, input, camEnt);
}
/* float amount = glm::radians( time / 2048.0f * 360.0f );
diff --git a/fggl/CMakeLists.txt b/fggl/CMakeLists.txt
index e99b358..3311372 100644
--- a/fggl/CMakeLists.txt
+++ b/fggl/CMakeLists.txt
@@ -12,7 +12,7 @@ FetchContent_Declare(
FetchContent_MakeAvailable( glfw3 )
endif ()
-add_library(fggl fggl.cpp ecs/ecs.cpp gfx/window.cpp gfx/renderer.cpp gfx/shader.cpp gfx/ogl.cpp data/model.cpp data/procedural.cpp debug/debug.cpp)
+add_library(fggl fggl.cpp ecs/ecs.cpp gfx/window.cpp gfx/renderer.cpp gfx/input.cpp gfx/shader.cpp gfx/ogl.cpp data/model.cpp data/procedural.cpp debug/debug.cpp)
target_include_directories(fggl PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../)
# Graphics backend
diff --git a/fggl/gfx/input.cpp b/fggl/gfx/input.cpp
new file mode 100644
index 0000000..23dc9b9
--- /dev/null
+++ b/fggl/gfx/input.cpp
@@ -0,0 +1,97 @@
+#include <fggl/gfx/input.hpp>
+#include <cassert>
+
+#include <bitset>
+#include <iostream>
+
+using fggl::gfx::Input;
+
+Input::Input() : m_mouse_curr(), m_mouse_last(), m_joydata(), m_joysticks() {
+ clear();
+}
+
+void Input::clear() {
+ 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;
+}
+
+void Input::frame() {
+ m_mouse_last = m_mouse_curr;
+ m_mouse_curr.scroll[0] = 0.0;
+ m_mouse_curr.scroll[1] = 0.0;
+}
+
+void Input::mousePos(double x, double y) {
+ assert( m_mouse_curr.cursor != nullptr );
+ m_mouse_curr.cursor[0] = x;
+ m_mouse_curr.cursor[1] = y;
+}
+
+double Input::cursorDeltaX() const {
+ return m_mouse_last.cursor[0] - m_mouse_curr.cursor[0];
+}
+
+double Input::cursorDeltaY() const {
+ return m_mouse_last.cursor[1] - m_mouse_curr.cursor[1];
+}
+
+const double* Input::mousePos() const {
+ 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;
+}
+
+const double* Input::mouseScroll() const {
+ return m_mouse_curr.scroll.data();
+}
+
+double Input::scrollDeltaX() const {
+ return m_mouse_curr.scroll[0];
+}
+
+double Input::scrollDeltaY() const {
+ 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;
+ }
+}
+
+bool Input::mouseDown(const MouseButton btn) const {
+ return m_mouse_curr.buttons & btn;
+}
+
+bool Input::mousePressed(const MouseButton btn) const {
+ return (m_mouse_curr.buttons & btn) && !(m_mouse_last.buttons & btn);
+}
+
+bool Input::mouseReleased(const MouseButton btn) const {
+ return !(m_mouse_curr.buttons & btn) && (m_mouse_last.buttons & btn);
+}
+
+void Input::joystickConnect(int id, Joystick &data){
+ std::cout << "JOYSTICK TIME: " << data.name << std::endl;
+ 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();
+}
+
+bool Input::joystick(int id) const {
+ return m_joysticks[id];
+}
diff --git a/fggl/gfx/input.hpp b/fggl/gfx/input.hpp
new file mode 100644
index 0000000..4922848
--- /dev/null
+++ b/fggl/gfx/input.hpp
@@ -0,0 +1,99 @@
+#ifndef FGGL_GFX_INPUT_H
+#define FGGL_GFX_INPUT_H
+
+#include <array>
+#include <bitset>
+
+namespace fggl::gfx {
+
+ enum MouseButton {
+ MOUSE_1 = 0b00000001,
+ MOUSE_2 = 0b00000010,
+ MOUSE_3 = 0b00000100,
+ MOUSE_4 = 0b00001000,
+ MOUSE_5 = 0b00010000,
+ MOUSE_6 = 0b00100000,
+ MOUSE_7 = 0b01000000,
+ MOUSE_8 = 0b10000000,
+ };
+
+ struct MouseInputState {
+ std::array<double, 2> cursor;
+ std::array<double, 2> scroll;
+ char buttons;
+ };
+
+ struct Joystick {
+ const char* name = nullptr;
+ const float* axes = nullptr;
+ const unsigned char* buttons = nullptr;
+ const unsigned char* hats = nullptr;
+ int hatCount = 0;
+ int axisCount = 0;
+ int buttonCount = 0;
+ };
+
+ class Input {
+ public:
+ // this is a neccerry evil due to glfw's design :'(
+ static Input& instance() {
+ static Input *instance = new Input();
+ return *instance;
+ }
+
+ void clear();
+ void frame();
+
+ // state motification
+ void mousePos(double x, double y);
+ void mouseScroll(double deltaX, double deltaY);
+ void mouseBtn(const MouseButton btn, bool state);
+
+ // mouse position
+ const double* mousePos() const;
+ double cursorDeltaX() const;
+ double cursorDeltaY() const;
+
+ // mouse scroll
+ const double* mouseScroll() const;
+ double scrollDeltaX() const;
+ double scrollDeltaY() const;
+
+ /**
+ * is the mouse button down this frame?
+ *
+ * True is the mouse button is down
+ */
+ bool mouseDown(const MouseButton btn) const;
+
+ /**
+ * Was the mouse button pressed this frame?
+ *
+ * True if the mouse button is down, but was up last frame
+ */
+ bool mousePressed(const MouseButton btn) const;
+
+ /**
+ * Was the mouse button released this frame?
+ *
+ * True if the mouse button is up, but was down last frame
+ */
+ bool mouseReleased(const MouseButton btn) const;
+
+ // joysticks
+ void joystickConnect(int id, Joystick& data);
+ void joystickDisconnect(int id);
+
+ bool joystick(int id) const;
+
+ private:
+ Input();
+ MouseInputState m_mouse_curr;
+ MouseInputState m_mouse_last;
+ std::bitset<16> m_joysticks;
+ std::array<Joystick, 16> m_joydata;
+ };
+
+};
+
+#endif
diff --git a/fggl/gfx/window.cpp b/fggl/gfx/window.cpp
index f160f03..9cde13b 100644
--- a/fggl/gfx/window.cpp
+++ b/fggl/gfx/window.cpp
@@ -21,7 +21,41 @@ static void framebuffer_resize(GLFWwindow* window, int width, int height) {
fgglWindow->framesize( width, height );
}
+static void fggl_input_cursor(GLFWwindow* window, double x, double y) {
+ Input& input = Input::instance();
+ input.mousePos(x, y);
+}
+
+static void fggl_input_scroll(GLFWwindow* window, double x, double y) {
+ Input& input = Input::instance();
+ input.mouseScroll(x, y);
+}
+
+static void fggl_input_mouse_btn(GLFWwindow* window, int btn, int action, int mods) {
+ // as we need the singleton for joysticks, might as well use it for these as well...
+ Input& input = Input::instance();
+ fggl::gfx::MouseButton buttonBit = (fggl::gfx::MouseButton)(1 << btn);
+ input.mouseBtn( buttonBit, action == GLFW_PRESS );
+}
+
+static void fggl_joystick(int jid, int state) {
+ Input& input = Input::instance();
+ if ( state == GLFW_CONNECTED ) {
+ fggl::gfx::Joystick data;
+ data.name = glfwGetJoystickName(jid);
+ data.axes = glfwGetJoystickAxes(jid, &data.axisCount);
+ data.buttons = glfwGetJoystickButtons(jid, &data.buttonCount);
+ data.hats = glfwGetJoystickHats(jid, &data.hatCount);
+
+ input.joystickConnect(jid, data);
+ } else if ( state == GLFW_DISCONNECTED ) {
+ input.joystickDisconnect(jid);
+ }
+}
+
Context::Context() {
+ glfwInitHint(GLFW_JOYSTICK_HAT_BUTTONS, GLFW_FALSE);
+
int state = glfwInit();
if ( state == GLFW_FALSE ) {
const char** error;
@@ -38,7 +72,7 @@ void Context::pollEvents() {
glfwPollEvents();
}
-Window::Window() : m_window(nullptr), m_input(nullptr) {
+Window::Window(Input& input) : m_window(nullptr), m_input(input) {
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
@@ -52,6 +86,12 @@ Window::Window() : m_window(nullptr), m_input(nullptr) {
m_framesize = glm::vec2(1920, 1080);
glfwSetWindowUserPointer(m_window, this);
glfwSetFramebufferSizeCallback( m_window, framebuffer_resize );
+
+ // input functions
+ glfwSetScrollCallback(m_window, fggl_input_scroll);
+ glfwSetCursorPosCallback(m_window, fggl_input_cursor);
+ glfwSetMouseButtonCallback(m_window, fggl_input_mouse_btn);
+ glfwSetJoystickCallback(fggl_joystick);
}
Window::~Window() {
diff --git a/fggl/gfx/window.hpp b/fggl/gfx/window.hpp
index 3045983..eaff910 100644
--- a/fggl/gfx/window.hpp
+++ b/fggl/gfx/window.hpp
@@ -6,6 +6,7 @@
#include <fggl/math/types.hpp>
#include <fggl/gfx/rendering.hpp>
+#include <fggl/gfx/input.hpp>
namespace fggl::gfx {
@@ -17,10 +18,6 @@ namespace fggl::gfx {
void pollEvents();
};
- class Input {
- private:
- };
-
enum MutWindowHint {
Decorated = GLFW_DECORATED,
Resizable = GLFW_RESIZABLE,
@@ -42,7 +39,7 @@ namespace fggl::gfx {
};
class Window {
public:
- Window();
+ Window(Input& input);
~Window();
// window <-> opengl stuff
@@ -123,9 +120,17 @@ namespace fggl::gfx {
return m_window;
}
+ inline Input& input() {
+ return m_input;
+ }
+
+/* inline const Input* input() const {
+ return m_input;
+ }*/
+
private:
GLFWwindow* m_window;
- Input* m_input;
+ Input& m_input;
math::vec2 m_framesize;
inline void set_hint(int hint, bool state) const {
--
GitLab