111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
#define GL_GLEXT_PROTOTYPES
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#include <stdio.h>
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#include <GL/gl.h>
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#include <SDL3/SDL.h>
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void checkGlError() {
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const char *err = SDL_GetError();
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if (*err != 0) {
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printf("OpenGL error: %s", err);
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}
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}
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const char *fragment_shader_source =
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"#version 330 core\n"
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"out vec4 FragColor;\n"
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"in vec2 uv;\n"
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"\n"
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"void main()\n"
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"{\n"
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" FragColor = vec4(gl_FragCoord.xy / 800, 0.0, 1.0);\n"
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"}\n";
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GLuint compile_shader(GLuint type, const char *src) {
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GLuint id = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(id, 1, &src, 0);
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glCompileShader(id);
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int result;
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glGetShaderiv(id, GL_COMPILE_STATUS, &result);
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if (result == GL_FALSE) {
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int length;
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glGetShaderiv(id, GL_INFO_LOG_LENGTH, &result);
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char *message = alloca(length * sizeof(char));
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glGetShaderInfoLog(id, length, &length, message);
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printf("failed to compile %s shader\n", type == GL_VERTEX_SHADER ? "vertex" : "fragment");
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printf("%s\n", message);
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glDeleteShader(id);
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return 0;
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}
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return id;
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}
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GLuint create_shader(const char *fragment_src) {
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GLuint program = glCreateProgram();
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GLuint fragment_shader = compile_shader(GL_FRAGMENT_SHADER, fragment_src);
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glAttachShader(program, fragment_shader);
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glLinkProgram(program);
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glValidateProgram(program);
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glDeleteShader(fragment_shader);
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return program;
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}
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int main() {
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printf("Good Morning 🍵\n");
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SDL_Init(SDL_INIT_VIDEO);
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SDL_Window* window = SDL_CreateWindow("SDL3 OpenGL Cube",
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800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
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if (!window) {
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printf("CreateWindow Error: %s\n", SDL_GetError());
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SDL_Quit();
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return 1;
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}
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SDL_GLContext glContext = SDL_GL_CreateContext(window);
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if (!glContext) {
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printf("GL Context Error: %s\n", SDL_GetError());
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 1;
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}
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glEnable(GL_DEPTH_TEST);
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SDL_Event e;
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int running = 1;
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float angle = 0.0;
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GLuint shader = create_shader(fragment_shader_source);
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glUseProgram(shader);
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while (running) {
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while (SDL_PollEvent(&e)) {
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if (e.type == SDL_EVENT_QUIT) running = false;
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}
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checkGlError();
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// Rendorrrr
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glViewport(0, 0, 800, 800);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f); // Dark gray background
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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//drawCube();
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// Front
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glBegin(GL_QUADS);
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glVertex2f(-1, 1);
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glVertex2f(-1,-1);
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glVertex2f( 1,-1);
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glVertex2f( 1, 1);
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glEnd();
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SDL_GL_SwapWindow(window);
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angle += 0.5;
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}
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checkGlError();
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}
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