112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
#define GL_GLEXT_PROTOTYPES
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#include<stdio.h>
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#include<stdbool.h>
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#include<stdlib.h>
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#include<stdint.h>
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#include <SDL2/SDL.h>
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <GL/glu.h>
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#include <GL/glext.h>
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#include "shader.h"
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#define CANVAS_WIDTH 1920
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#define CANVAS_HEIGHT 1080
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// #define KEY_HANDLING
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// #define DEBUG
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static void on_render ()
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{
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glRecti(-1,-1,1,1);
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}
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static void on_realize()
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{
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// compile shader
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GLuint f = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(f, 1, &shader_frag, NULL);
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glCompileShader(f);
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#ifdef DEBUG
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GLint isCompiled = 0;
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glGetShaderiv(f, GL_COMPILE_STATUS, &isCompiled);
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if(isCompiled == GL_FALSE) {
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GLint maxLength = 0;
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glGetShaderiv(f, GL_INFO_LOG_LENGTH, &maxLength);
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char* error = malloc(maxLength);
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glGetShaderInfoLog(f, maxLength, &maxLength, error);
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printf("%s\n", error);
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exit(-10);
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}
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#endif
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// link shader
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GLuint p = glCreateProgram();
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glAttachShader(p,f);
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glLinkProgram(p);
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#ifdef DEBUG
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GLint isLinked = 0;
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glGetProgramiv(p, GL_LINK_STATUS, (int *)&isLinked);
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if (isLinked == GL_FALSE) {
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GLint maxLength = 0;
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glGetProgramiv(p, GL_INFO_LOG_LENGTH, &maxLength);
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char* error = malloc(maxLength);
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glGetProgramInfoLog(p, maxLength, &maxLength,error);
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printf("%s\n", error);
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exit(-10);
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}
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#endif
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glUseProgram(p);
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}
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void _start() {
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asm volatile("sub $8, %rsp\n");
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SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
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SDL_Window* mainwindow = SDL_CreateWindow(
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"",
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0,
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0,
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CANVAS_WIDTH,
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CANVAS_HEIGHT,
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SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN
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);
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SDL_GL_CreateContext(mainwindow);
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SDL_ShowCursor(false);
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on_realize();
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while (true) {
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SDL_Event Event;
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while (SDL_PollEvent(&Event)) {
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if (Event.type == SDL_QUIT
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#if defined(KEY_HANDLING)
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|| (Event.type == SDL_KEYDOWN && Event.key.keysym.sym == SDLK_ESCAPE)
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#endif
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) {
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exit(0);
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}
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if (Event.type == SDL_WINDOWEVENT) {
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switch(Event.window.event) {
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case SDL_WINDOWEVENT_EXPOSED:
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on_render();
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SDL_GL_SwapWindow(mainwindow);
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default:
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break;
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}
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}
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}
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}
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__builtin_unreachable();
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}
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