Fix rendering entities

CMakeLists.txt

@@ -48,11 +48,7 @@ cmrc_add_resource_library(
 # Link dependencies
 target_link_libraries(simpleengine PUBLIC GLEW::GLEW)
 target_link_libraries(simpleengine PUBLIC glfw)
-if (WIN32)
-    target_link_libraries(simpleengine PUBLIC glm::glm)
-else()
-    target_link_libraries(simpleengine PUBLIC glm)
-endif()
+target_link_libraries(simpleengine PUBLIC ${GLM_LIBRARIES})
 target_link_libraries(simpleengine PUBLIC soil2)
 target_link_libraries(simpleengine PUBLIC ${OPENGL_LIBRARIES})
 target_link_libraries(simpleengine PRIVATE simpleengine_resources)

cmrc

@@ -1 +1 @@
-Subproject commit a64bea50c05594c8e7cf1f08e441bb9507742e2e
+Subproject commit e386a629eb537d384811e598a3c96b9ca928f65e

examples/dev_testing/src/main.cpp

@@ -7,6 +7,7 @@
 #include "simpleengine/gfx/renderer.h"
 #include "simpleengine/gfx/texture.h"
 #include "simpleengine/vector.h"
+#include <GLFW/glfw3.h>
 #include <simpleengine/gfx/shader.h>
 #include <simpleengine/renderable.h>
 #include <simpleengine/event/event.h>
@@ -37,6 +38,31 @@ CMRC_DECLARE(resource_shaders);
 
 namespace se = simpleengine;
 
+class FPSCounterEvent : public se::Event {
+public:
+    double last_frame_time;
+    int frame_count;
+
+    FPSCounterEvent() : se::Event() {
+        this->last_frame_time = glfwGetTime();
+        frame_count = 0;
+    }
+
+    virtual void update(const float& delta_time) {
+        double current_time = glfwGetTime();
+        frame_count++;
+
+        // Check if the last print was 1 second ago.
+        if (current_time - last_frame_time >= 1.0) {
+            double ms_per_frame = 1000 / (double) frame_count;
+            
+            printf("%d fps, %f ms/frame\n", frame_count, ms_per_frame);
+            frame_count = 0;
+            last_frame_time += 1.0;
+        }
+    }
+};
+
 std::string read_resource_shader(const std::string& path) {
     auto fs = cmrc::resource_shaders::get_filesystem();
     cmrc::file vertex_file = fs.open(path);
@@ -161,7 +187,7 @@ int main(int argc, char *argv[]) {
     auto renderer  = std::make_shared<se::gfx::Renderer>(game.get_window(), core_shader);
     renderer->enable_debug();
     renderer->submit_entity(entity);
-    game.add_event(renderer);
+    game.add_renderable(renderer);
     /* renderer->add_model(white_texture, cube);
     game.add_event(renderer); */
 
@@ -171,6 +197,11 @@ int main(int argc, char *argv[]) {
     auto camera = std::make_shared<se::Camera>(game.get_window(), core_shader, 70, glm::vec3(0, 0, 0));
     game.add_event(camera);
 
+    auto fps_counter = std::make_shared<FPSCounterEvent>();
+    game.add_event(fps_counter);
+
+    game.set_enable_vsync(true);
+    //game.set_fps_limit(120);
     int res = game.run();
 
     renderer->destroy();

include/simpleengine/game.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <chrono>
 #include <string>
 #include <memory>
 #include <vector>
@@ -13,6 +14,7 @@
 #include <GLFW/glfw3.h>
 
 #include "event/event.h"
+#include "simpleengine/renderable.h"
 
 namespace simpleengine {
     class Game {
@@ -34,6 +36,9 @@ namespace simpleengine {
         void enable_gl_option(GLenum option) const;
 
         void add_event(std::shared_ptr<simpleengine::Event> event);
+        void add_renderable(std::shared_ptr<simpleengine::Renderable> renderable_event);
+        void set_fps_limit(const int& fps_limit);
+        void set_enable_vsync(const bool& enabled);
 
         void update(const float& delta_time);
         void handle_input(const float& delta_time);
@@ -52,12 +57,17 @@ namespace simpleengine {
 
         GLFWwindow* window;
         std::vector<std::shared_ptr<simpleengine::Event>> events;
+        std::vector<std::shared_ptr<simpleengine::Renderable>> renderable_events;
         const bool& window_resizeable;
 
+        // FPS related stuff
+        void update_enabled_vsync() const;
+        void limit_framerate(const float& delta_time) const; // Triggered at the end of a draw to help limit the FPS to `fps_limit`.
+        int fps_limit;
+        bool enable_vsync;
+
         float get_delta_time();
 
-        float last_frame_time;
-        /* float currentFrameTime;
-        float deltaTime; */
+        std::chrono::high_resolution_clock::time_point last_frame_time;
     };
 }

include/simpleengine/gfx/light.h

@@ -23,7 +23,7 @@ namespace simpleengine::gfx {
             shader.unuse();
         }
 
-        virtual void render(GLFWwindow* target) override {
+        virtual void render() override {
 
         }
     };

include/simpleengine/gfx/renderer.h

@@ -54,6 +54,6 @@ namespace simpleengine::gfx {
 
         virtual void update(const float& delta_time) override;
         
-        virtual void render(GLFWwindow* target) override;
+        virtual void render() override;
     };
 }

include/simpleengine/renderable.h

@@ -2,10 +2,10 @@
  
 #include "event/event.h"
 
-#include <memory>
-
 #include <GLFW/glfw3.h>
 
+#include <memory>
+
 namespace simpleengine {
     class Renderable : public simpleengine::Event {
     private:
@@ -14,6 +14,6 @@ namespace simpleengine {
         Renderable() = default;
         virtual ~Renderable() = default;
 
-        virtual void render(GLFWwindow* target) = 0;
+        virtual void render() = 0;
     };
 }

include/simpleengine/shader_program.h

@@ -111,9 +111,5 @@ namespace simpleengine {
         virtual void update(const float& delta_time) {
 
         }
-
-        virtual void render(GLFWwindow* target) {
-            glUseProgram(program);
-        }
     };
 }

shell.nix

@@ -0,0 +1,16 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  # nativeBuildInputs is usually what you want -- tools you need to run
+  nativeBuildInputs = with pkgs; [
+    gdb
+    lldb
+    cmake
+    pkg-config
+    ninja
+    glew
+    glfw
+    glm
+    (callPackage ./soil2.nix { })
+  ];
+}

soil2.nix

@@ -0,0 +1,37 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, libGL
+, libX11
+}:
+
+stdenv.mkDerivation rec {
+  version = "39028e64921c03cabbc53b937da4a85aba264e00";
+  pname = "soil2";
+
+  src = fetchFromGitHub {
+    owner = "SpartanJ";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-zQQ8lwOkMCxdlf6zfnIOYVUTGVqnJuHL/LL8fbzxwHY=";
+  };
+
+  nativeBuildInputs = [ cmake libGL libX11 ];
+
+  installPhase = ''
+    runHook preInstall
+
+    cmake --build . --target install --config Release
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "SOIL2 is a tiny C library used primarily for uploading textures into OpenGL.";
+    homepage = "https://github.com/SpartanJ/SOIL2";
+    license = licenses.mit0;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ seanomik ];
+  };
+}

src/game.cpp

@@ -1,7 +1,11 @@
 #include "game.h"
 #include "event/event.h"
+#include "renderable.h"
 
+#include <chrono>
 #include <iostream>
+#include <ratio>
+#include <thread>
 
 #ifdef __linux__
 #include <GL/glew.h>
@@ -14,7 +18,8 @@
 #endif
 
 simpleengine::Game::Game(int w, int h, const std::string& window_name, const int& gl_profile, const int& major_version,
-        const int& minor_version, const bool& resizeable, const int& forward_compat) : window_resizeable(resizeable) {
+        const int& minor_version, const bool& resizeable, const int& forward_compat) : window_resizeable(resizeable),
+        enable_vsync(true), fps_limit(-1) {
     initialize(gl_profile, major_version, minor_version, window_resizeable, forward_compat);
 
     // Create a window
@@ -47,6 +52,8 @@ void simpleengine::Game::enable_default_gl_options() const {
     glEnable(GL_CULL_FACE);
     glCullFace(GL_BACK);
     //glFrontFace(GL_CW);
+
+    update_enabled_vsync();
 }
 
 void simpleengine::Game::enable_gl_option(GLenum option) const {
@@ -73,6 +80,33 @@ void simpleengine::Game::add_event(std::shared_ptr<simpleengine::Event> event) {
     events.push_back(event);
 }
 
+void simpleengine::Game::add_renderable(std::shared_ptr<simpleengine::Renderable> renderable_event) {
+    renderable_events.push_back(renderable_event);
+    
+    // Also push to normal events to trigger updates.
+    // Instead of this, we could instead loop renderable_events in the update function,
+    // but that would cause multiple loops.
+    events.push_back(renderable_event);
+}
+
+void simpleengine::Game::set_fps_limit(const int& fps_limit) {
+    this->fps_limit = fps_limit;
+}
+
+void simpleengine::Game::set_enable_vsync(const bool& enabled) {
+    this->enable_vsync = enabled;
+
+    this->update_enabled_vsync();
+}
+
+void simpleengine::Game::update_enabled_vsync() const {
+    if (enable_vsync) {
+        //glfwSwapInterval(1);
+    } else {
+        glfwSwapInterval(0);
+    }
+}
+
 void simpleengine::Game::update(const float& delta_time) {
     handle_input(delta_time);
 
@@ -83,7 +117,7 @@ void simpleengine::Game::update(const float& delta_time) {
 }
 
 void simpleengine::Game::handle_input(const float& delta_time) {
-
+    // TODO
 }
 
 void simpleengine::Game::render_window(const float& delta_time) {
@@ -93,17 +127,30 @@ void simpleengine::Game::render_window(const float& delta_time) {
 }
 
 void simpleengine::Game::render_items(const float& delta_time) {
-    for (const std::shared_ptr<Event>& event : events) {
-        //event->render(window);
+    for (const std::shared_ptr<Renderable>& renderable : renderable_events) {
+        renderable->render();
     }
 }
 
 float simpleengine::Game::get_delta_time() {
-    float current_frame_time = glfwGetTime();
-    float delta_time = current_frame_time - last_frame_time;
+    auto current_frame_time = std::chrono::high_resolution_clock::now();
+    std::chrono::duration delta_dur = current_frame_time - last_frame_time;
     last_frame_time = current_frame_time;
 
-    return delta_time;
+    return std::chrono::duration_cast<std::chrono::duration<float>>(delta_dur).count();
+}
+
+void simpleengine::Game::limit_framerate(const float& delta_time) const {
+    if (!enable_vsync && fps_limit >= 15) {
+        auto delta_time_duration = std::chrono::duration<float>(delta_time);
+        auto limit_duration = std::chrono::duration<float>(1 / ( (float) fps_limit / 2));
+
+        if (delta_time_duration < limit_duration) {
+            auto sleep_duration = limit_duration - delta_time_duration;
+
+            std::this_thread::sleep_for(sleep_duration);
+        }
+    }
 }
 
 int simpleengine::Game::run() {
@@ -111,16 +158,17 @@ int simpleengine::Game::run() {
         // Get delta time first thing
         float delta_time = get_delta_time();
 
-        // Update input
+        // Poll input events
         glfwPollEvents();
 
         update(delta_time);
-
         render_window(delta_time);
 
         // End draw
         glfwSwapBuffers(window);
         glFlush();
+        
+        limit_framerate(delta_time);
     }
 
     return 0;

src/gfx/renderer.cpp

@@ -100,7 +100,7 @@ namespace simpleengine::gfx {
     }
 
     void Renderer::update(const float& delta_time) {
-        this->render(nullptr);
+        
     }
 
     void Renderer::initialize() {
@@ -115,7 +115,7 @@ namespace simpleengine::gfx {
         }
     }
 
-    void Renderer::render(GLFWwindow* target) {
+    void Renderer::render() {
         shader.use();
         
         for (auto& [handle, rendering] : rendering_models) {