readme

include/graphics.hpp

@@ -0,0 +1,45 @@
+#ifndef GRAPHICS_HPP
+#define GRAPHICS_HPP
+#define GL_GLEXT_PROTOTYPES
+
+// Includes
+#include "imgui.h"
+#include "imgui_impl_sdl3.h"
+#include "imgui_impl_opengl3.h"
+#include <SDL3/SDL_opengl.h>
+#include "window.hpp"
+
+// Constants
+const int open_gl_major_version = 3;
+const int open_gl_minor_version = 3;
+const int enable_vsync = 1;
+
+// Variables
+extern Uint32 last_time;
+extern Uint32 current_time;
+extern float frame_time;
+extern float fps;
+extern float frame_time_graph[100];
+extern SDL_GLContext gl_context;
+
+extern ImGuiIO& io;
+extern ImGuiStyle& style;
+
+// Functions
+int initialize_opengl();
+void cleanup_opengl();
+
+// ImGui
+int initialize_imgui();
+void cleanup_imgui();
+void new_frame_imgui();
+void frame_time_ui();
+
+// Frame time calculation
+void calc_frame_time();
+
+// Shader management
+unsigned int compile_shader(const char* shader_source, GLenum shader_type);
+unsigned int create_program(unsigned int vertex_shader, unsigned int fragment_shader);
+
+#endif

include/main.hpp

@@ -1,44 +1,16 @@
 #ifndef MAIN_HPP
 #define MAIN_HPP
 
-// ImGui
+// Includes
-#include "imgui.h"
-#include "imgui_impl_sdl3.h"
-#include "imgui_impl_opengl3.h"
-
-// SDL3 and OpenGL
-#include <SDL3/SDL.h>
-#include <SDL3/SDL_opengl.h>
-
-// C++ Standard Library
 #include <iostream>
-#include <string>
+#include "window.hpp"
-#include <vector>
+#include "graphics.hpp"
-
+#include "utils.hpp"
-// Structs
-
-
 
 // Variables
-int window_width = 1920;
+extern bool running;
-int window_height = 1080;
-
-float main_scale;
-SDL_WindowFlags window_flags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN | SDL_WINDOW_HIGH_PIXEL_DENSITY;
-SDL_Window* window;
-
-bool running;
-SDL_Event event;
-
-Uint32 last_time;
-Uint32 current_time;
-float frame_time;
-float fps;
-float frame_time_graph[100] = {0.0f};
 
 // Functions
 int main(int argc, char* argv[]);
-int initialize();
-void cleanup();
 
 #endif

include/utils.hpp

@@ -0,0 +1,11 @@
+#ifndef UTILS_HPP
+#define UTILS_HPP
+
+// Includes
+#include <fstream>
+#include <iostream>
+
+// Function
+char* read_file(const char* file_path);
+
+#endif

include/window.hpp

@@ -0,0 +1,22 @@
+#ifndef WINDOW_HPP
+#define WINDOW_HPP
+
+// Includes
+#include "iostream"
+#include <SDL3/SDL.h>
+
+// Constants
+const int window_width = 800;
+const int window_height = 600;
+
+// Variables
+const SDL_WindowFlags window_flags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN | SDL_WINDOW_HIGH_PIXEL_DENSITY;
+extern float main_scale;
+extern SDL_Window* window;
+extern SDL_Event event;
+
+// Functions
+int initialize_sdl();
+void cleanup_sdl();
+
+#endif

readme.md

@@ -21,6 +21,7 @@ Cus I cant think of a name and im uncreative.
 
 # Features
 - FPS counter
+- !!! RGB RECTANGLE !!!
 - Thats about it rly ¯\\_(ツ)\_/¯
 
 # Requirements
@@ -35,3 +36,9 @@ Cus I cant think of a name and im uncreative.
 6. If it runs, enjoy the FPS counter
 
 \* we dont like clang here (idk why, i just dont like it cus y not)
+
+# Notes
+OpenGl is scary >.<
+
+# License
+"yes"

shaders/triangle.frag

@@ -0,0 +1,8 @@
+#version 330 core
+
+out vec4 FragColor;
+in vec3 color; // Input color from the vertex shader
+
+void main() {
+    FragColor = vec4(color, 1.0); // Set the fragment color to the input color
+} 

shaders/triangle.vert

@@ -0,0 +1,9 @@
+#version 330 core
+
+layout(location = 0) in vec3 position; // Vertex position
+out vec3 color; // Output color to the fragment shader
+
+void main() {
+    gl_Position = vec4(position, 1.0); // Set the position of the vertex
+    color = position + vec3(0.5); // Set the color based on the vertex position
+}

src/graphics.cpp

@@ -0,0 +1,158 @@
+#include "graphics.hpp"
+
+// Variables
+Uint32 last_time;
+Uint32 current_time;
+float frame_time;
+float fps;
+float frame_time_graph[100];
+
+SDL_GLContext gl_context;
+
+// Functions
+int initialize_opengl() {
+    // Initialize OpenGL
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, open_gl_major_version);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, open_gl_minor_version);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+
+    // Initialize OpenGL context
+    gl_context = SDL_GL_CreateContext(window);
+    if (!gl_context) {
+        std::cerr << "OpenGL context could not be created! SDL_Error: " << SDL_GetError() << std::endl;
+        return 1; // OpenGL context creation failed
+    }
+
+    // Initialize OpenGL settings for the window
+    SDL_GL_MakeCurrent(window, gl_context);
+    SDL_GL_SetSwapInterval(enable_vsync);
+    SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
+    SDL_ShowWindow(window);
+
+    glViewport(0, 0, (int)(window_width * main_scale), (int)(window_height * main_scale));
+
+    return 0; // OpenGL initialization successful
+}
+
+void cleanup_opengl() {
+    // Destroy OpenGL context
+    if (gl_context) {
+        SDL_GL_MakeCurrent(NULL, NULL);
+        SDL_GL_DestroyContext(gl_context);
+        gl_context = nullptr;
+    }
+    std::cout << "OpenGL cleanup successful." << std::endl;
+}
+
+unsigned int compile_shader(const char* shader_source, GLenum shader_type) {
+    unsigned int shader = glCreateShader(shader_type);
+    if (shader == 0) {
+        std::cerr << "Failed to create shader." << std::endl;
+        return 0; // Shader creation failed
+    }
+
+    glShaderSource(shader, 1, &shader_source, nullptr);
+    glCompileShader(shader);
+
+    // Check for compilation errors
+    int success;
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+    if (!success) {
+        char info_log[512];
+        glGetShaderInfoLog(shader, sizeof(info_log), nullptr, info_log);
+        std::cerr << "Shader compilation error: " << info_log << std::endl;
+        glDeleteShader(shader);
+        return 0; // Shader compilation failed
+    }
+
+    return shader; // Shader compiled successfully
+}
+
+unsigned int create_program(unsigned int vertex_shader, unsigned int fragment_shader) {
+    unsigned int program = glCreateProgram();
+    if (program == 0) {
+        std::cerr << "Failed to create shader program." << std::endl;
+        return 0; // Program creation failed
+    }
+
+    glAttachShader(program, vertex_shader);
+    glAttachShader(program, fragment_shader);
+    glLinkProgram(program);
+
+    // Check for linking errors
+    int success;
+    glGetProgramiv(program, GL_LINK_STATUS, &success);
+    if (!success) {
+        char info_log[512];
+        glGetProgramInfoLog(program, sizeof(info_log), nullptr, info_log);
+        std::cerr << "Shader program linking error: " << info_log << std::endl;
+        glDeleteProgram(program);
+        return 0; // Program linking failed
+    }
+
+    return program; // Program created successfully
+}
+
+int initialize_imgui() {
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+    ImGui::StyleColorsDark();
+    ImGuiStyle& style = ImGui::GetStyle();
+    style.ScaleAllSizes(main_scale);
+    style.FontScaleDpi = main_scale;
+
+    if (!ImGui_ImplSDL3_InitForOpenGL(window, gl_context)) {
+        std::cerr << "ImGui_ImplSDL3_InitForOpenGL failed!" << std::endl;
+        return 1; // Initialization failed
+    }
+
+    char glsl_version[32];
+    snprintf(glsl_version, sizeof(glsl_version), "#version %d%d0", open_gl_major_version, open_gl_minor_version);
+    if (!ImGui_ImplOpenGL3_Init(glsl_version)) {
+        std::cerr << "ImGui_ImplOpenGL3_Init failed!" << std::endl;
+        ImGui_ImplSDL3_Shutdown();
+        ImGui::DestroyContext();
+        return 1; // Initialization failed
+    }
+
+    return 0;
+}
+
+void cleanup_imgui() {
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplSDL3_Shutdown();
+    ImGui::DestroyContext();
+    std::cout << "ImGui cleanup successful." << std::endl;
+}
+
+void calc_frame_time() {
+    // Calculate frame time
+    current_time = SDL_GetTicks();
+    frame_time = (current_time - last_time) / 1000.0f; // Convert milliseconds to seconds
+    fps = 1.0f / frame_time;
+    last_time = current_time;
+
+    // Update frame time graph
+    for (int i = 99; i > 0; --i) {
+        frame_time_graph[i] = frame_time_graph[i - 1]; // Shift old values
+    }
+    frame_time_graph[0] = frame_time; // Add new frame time
+}
+
+void new_frame_imgui() {
+    ImGui_ImplOpenGL3_NewFrame();
+    ImGui_ImplSDL3_NewFrame();
+    ImGui::NewFrame();
+}
+
+void frame_time_ui() {
+    ImGui::Begin("Frame Time");
+    ImGui::Text("Current FPS: %.2f", fps);
+    ImGui::Text("Current Frame Time: %.3f ms", frame_time * 1000.0f);
+    ImGui::PlotLines("##Frame Time Graph", frame_time_graph, 100, 0, "Frame Time (ms)", 0.0f, 0.1f, ImVec2(200, 80));
+    ImGui::End();
+}

src/main.cpp

@@ -1,170 +1,135 @@
 #include "main.hpp"
+#include <GL/glu.h>
 
-
+// Variables
-// Init
+bool running = true;
-int initialize() {
-    // Initialize SDL
-    if (!SDL_Init(SDL_INIT_VIDEO)) {
-        std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
-        return 1; // Initialization failed
-    }
-
-    // Create a window with OpenGL context
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
-    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
-    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
-
-    main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
-    window = SDL_CreateWindow("Untitled", (int)(window_width * main_scale), (int)(window_height * main_scale), window_flags);
-    if (!window) {
-        std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
-        SDL_Quit();
-        return 1; // Window creation failed
-    }
-    
-    // Initialize OpenGL context
-    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
-    if (!gl_context) {
-        std::cerr << "OpenGL context could not be created! SDL_Error: " << SDL_GetError() << std::endl;
-        SDL_DestroyWindow(window);
-        SDL_Quit();
-        return 1; // OpenGL context creation failed
-    }
-
-    SDL_GL_MakeCurrent(window, gl_context);
-    SDL_GL_SetSwapInterval(1); // Enable VSync
-    SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
-    SDL_ShowWindow(window);
-
-    // Initialize ImGui
-    IMGUI_CHECKVERSION();
-    ImGui::CreateContext();
-    ImGuiIO& io = ImGui::GetIO(); (void)io;
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
-
-    // Setup Dear ImGui style
-    ImGui::StyleColorsDark();
-
-    // Setup scale
-    ImGuiStyle& style = ImGui::GetStyle();
-    style.ScaleAllSizes(main_scale);
-    style.FontScaleDpi = main_scale;
-
-    // Setup Platform/Renderer bindings
-    if (!ImGui_ImplSDL3_InitForOpenGL(window, gl_context)) {
-        std::cerr << "ImGui_ImplSDL3_InitForOpenGL failed!" << std::endl;
-        SDL_GL_DestroyContext(gl_context);
-        SDL_DestroyWindow(window);
-        SDL_Quit();
-        return 1; // Initialization failed
-    }
-
-    if (!ImGui_ImplOpenGL3_Init("#version 330")) {
-        std::cerr << "ImGui_ImplOpenGL3_Init failed!" << std::endl;
-        ImGui_ImplSDL3_Shutdown();
-        SDL_GL_DestroyContext(gl_context);
-        SDL_DestroyWindow(window);
-        SDL_Quit();
-        return 1; // Initialization failed
-    }
-
-    return 0; // Initialization successful
-}
-
-
-// Cleanup
-void cleanup() {
-    // Shutdown ImGui
-    ImGui_ImplOpenGL3_Shutdown();
-    ImGui_ImplSDL3_Shutdown();
-    ImGui::DestroyContext();
-
-    // Destroy OpenGL context
-    SDL_GLContext gl_context = SDL_GL_GetCurrentContext();
-    if (gl_context) {
-        SDL_GL_MakeCurrent(NULL, NULL);
-        SDL_GL_DestroyContext(gl_context);
-    }
-
-    // Destroy window
-    if (window) {
-        SDL_DestroyWindow(window);
-        window = nullptr;
-    }
-
-    // Quit SDL
-    SDL_Quit();
-    std::cout << "Cleanup successful." << std::endl;
-}
-
 
 // Main
 int main(int argc, char* argv[]) {
-    // Initialize
+    // Initialize SDL
-    if (initialize() != 0) {
+    if (initialize_sdl() != 0) {
-        std::cerr << "Initialization failed." << std::endl;
+        std::cerr << "SDL initialization failed." << std::endl;
-        return -1; // Initialization failed
+        return 1; // SDL initialization failed
     }
 
+    // Initialize OpenGL
+    if (initialize_opengl() != 0) {
+        std::cerr << "OpenGL initialization failed." << std::endl;
+        cleanup_sdl();
+        return 1; // OpenGL initialization failed
+    }
+
+    // Initialize ImGui
+    if (initialize_imgui() != 0) {
+        std::cerr << "ImGui initialization failed." << std::endl;
+        cleanup_opengl();
+        cleanup_sdl();
+        return 1; // ImGui initialization failed
+    }
+
+    // Triangle vertices
+    float vertices[] = {
+        0.5f,  0.5f, 0.0f,  // top right
+        0.5f, -0.5f, 0.0f,  // bottom right
+        -0.5f, -0.5f, 0.0f,  // bottom left
+        -0.5f,  0.5f, 0.0f   // top left 
+    };
+
+    unsigned int indices[] = {
+        0, 1, 3,   // first triangle
+        1, 2, 3    // second triangle
+    };  
+
+    // Vertex buffer object (VBO) and vertex array object (VAO) and element buffer object (EBO)
+    unsigned int VBO, VAO, EBO;
+
+    glGenVertexArrays(1, &VAO); // Generate a vertex array object
+    glGenBuffers(1, &VBO); // Generate a vertex buffer object
+    glGenBuffers(1, &EBO); // Generate an element buffer object
+
+    glBindVertexArray(VAO); // Bind the vertex array object
+    glBindBuffer(GL_ARRAY_BUFFER, VBO); // Bind the vertex buffer object
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO); // Bind the element buffer object
+
+    // Upload vertex data to the buffer
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+    // Set up vertex attributes
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+
+    glBindVertexArray(0); // Unbind the vertex array object
+
+    // Load shaders
+    const char* vertex_shader_source = read_file("shaders/triangle.vert");
+    const char* fragment_shader_source = read_file("shaders/triangle.frag");
+
+    unsigned int vertex_shader = compile_shader(vertex_shader_source, GL_VERTEX_SHADER);
+    unsigned int fragment_shader = compile_shader(fragment_shader_source, GL_FRAGMENT_SHADER);
+    unsigned int shader_program = create_program(vertex_shader, fragment_shader);
+
+    // Set the shader program
+    glUseProgram(shader_program);
+
+    // Wireframe toggle
+    bool wireframe_mode = false;
+
     // Main loop
-    running = true;
-    last_time = SDL_GetTicks();
     while (running) {
 
         // Handle events
         while (SDL_PollEvent(&event)) {
-            ImGui_ImplSDL3_ProcessEvent(&event);
+            ImGui_ImplSDL3_ProcessEvent(&event); // Process ImGui events
             if (event.type == SDL_EVENT_QUIT) {
                 running = false; // Exit loop on quit event
             }
         }
 
         // Start the ImGui frame
-        ImGui_ImplOpenGL3_NewFrame();
+        new_frame_imgui();
-        ImGui_ImplSDL3_NewFrame();
-        ImGui::NewFrame();
 
-        // Show a simple ImGui window
+        // Frame time UI
-        ImGui::Begin("Hello, World!");
+        frame_time_ui();
-        ImGui::Text("This is a simple ImGui window.");
+
-        if (ImGui::Button("Close")) {
+        // Toggle wireframe mode ui
-            running = false; // Close button clicked
+        ImGui::Begin("Wireframe Mode");
+        if (ImGui::Checkbox("Enable Wireframe Mode", &wireframe_mode)) {
+            if (wireframe_mode) {
+                glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); // Enable wireframe mode
+            } else {
+                glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); // Disable wireframe mode
+            }
         }
         ImGui::End();
 
-        // Display FPS in the ImGui window
-        ImGui::Begin("FPS Counter");
-        ImGui::Text("Current FPS: %.2f", fps);
-        // Frame time graph
-        ImGui::PlotLines("##FrameTime", frame_time_graph, 100, 0, "Frame Time (ms)", 0.0f, 0.1f, ImVec2(200, 80));
-        ImGui::Text("Current Time: %u ms", current_time);
-
-        ImGui::End();
-
         // Render
         ImGui::Render();
-        glViewport(0, 0, (int)(window_width * main_scale), (int)(window_height * main_scale));
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
-        glClearColor(0.45f, 0.55f, 0.60f, 1.00f);
         glClear(GL_COLOR_BUFFER_BIT);
+
+        glBindVertexArray(VAO); // Bind the vertex array object
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); // Draw the triangles
+
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
         SDL_GL_SwapWindow(window);
 
         // Calculate FPS
-        current_time = SDL_GetTicks();
+        calc_frame_time();
-        frame_time = (current_time - last_time) / 1000.0f; // Convert milliseconds to seconds
-        fps = 1.0f / frame_time;
-        last_time = current_time;
-
-        // Update frame time graph
-        for (int i = 99; i > 0; --i) {
-            frame_time_graph[i] = frame_time_graph[i - 1]; // Shift old values
-        }
-        frame_time_graph[0] = frame_time; // Add new frame time
     }
 
     // Cleanup
-    cleanup();
+    glDeleteVertexArrays(1, &VAO);
+    glDeleteBuffers(1, &VBO);
+    glDeleteBuffers(1, &EBO);
+    glDeleteProgram(shader_program);
+    glDeleteShader(vertex_shader);
+    glDeleteShader(fragment_shader);
+    free((void*)vertex_shader_source);
+    free((void*)fragment_shader_source);
+    cleanup_imgui();
+    cleanup_opengl();
+    cleanup_sdl();
+    std::cout << "Application exited successfully." << std::endl;
+    return 0; // Exit code
 }

src/utils.cpp

@@ -0,0 +1,24 @@
+#include "utils.hpp"
+
+char* read_file(const char* file_path) {
+    std::ifstream file(file_path);
+    if (!file) {
+        std::cerr << "Could not open file: " << file_path << std::endl;
+        return nullptr; // Return null if file cannot be opened
+    }
+
+    file.seekg(0, std::ios::end);
+    size_t file_size = file.tellg();
+    file.seekg(0, std::ios::beg);
+
+    char* buffer = new char[file_size + 1];
+    if (!buffer) {
+        std::cerr << "Memory allocation failed" << std::endl;
+        return nullptr;
+    }
+
+    file.read(buffer, file_size);
+    buffer[file_size] = '\0'; // Null-terminate the string
+
+    return buffer;
+}

src/window.cpp

@@ -0,0 +1,37 @@
+#include "window.hpp"
+
+// Variables
+float main_scale;
+SDL_Window* window;
+SDL_Event event;
+
+// Functions
+int initialize_sdl() {
+    // Initialize SDL
+    if (!SDL_Init(SDL_INIT_VIDEO)) {
+        std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
+        return 1; // Initialization failed
+    }
+
+    main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
+    window = SDL_CreateWindow("Untitled", (int)(window_width * main_scale), (int)(window_height * main_scale), window_flags);
+    if (!window) {
+        std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
+        SDL_Quit();
+        return 1; // Window creation failed
+    }
+
+    return 0; // Initialization successful
+}
+
+void cleanup_sdl() {
+    if (window) {
+        // Destroy window
+        SDL_DestroyWindow(window);
+        window = nullptr;
+    }
+
+    // Quit SDL
+    SDL_Quit();
+    std::cout << "SDL cleanup successful." << std::endl;
+}