Initial commit - some engine bugs stopping compiling

third-party/glad/example/c/gl_sdl2.c

@@ -0,0 +1,64 @@
+// gcc example/c/gl_sdl2.c build/src/gl.c -Ibuild/include `sdl2-config --libs --cflags` -ldl
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <glad/gl.h>
+#include <SDL.h>
+#include <SDL_opengl.h>
+
+
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+int main(void) {
+    // code without checking for errors
+    SDL_Init(SDL_INIT_VIDEO);
+
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+
+    SDL_Window *window = SDL_CreateWindow(
+        "[glad] GL with SDL",
+        SDL_WINDOWPOS_CENTERED,
+        SDL_WINDOWPOS_CENTERED,
+        WIDTH, HEIGHT,
+        SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN
+    );
+
+    SDL_GLContext context = SDL_GL_CreateContext(window);
+
+    int version = gladLoadGL((GLADloadfunc) SDL_GL_GetProcAddress);
+    printf("GL %d.%d\n", GLAD_VERSION_MAJOR(version), GLAD_VERSION_MINOR(version));
+
+    int exit = 0;
+    while(!exit) {
+        SDL_Event event;
+        while (SDL_PollEvent(&event)) {
+            switch(event.type) {
+                case SDL_QUIT:
+                    exit = 1;
+                    break;
+                case SDL_KEYUP:
+                    if (event.key.keysym.sym == SDLK_ESCAPE) {
+                        exit = 1;
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        glClearColor(0.7f, 0.9f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        SDL_GL_SwapWindow(window);
+        SDL_Delay(1);
+    }
+
+    SDL_GL_DeleteContext(context);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return 0;
+}