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// python -m glad --out-path=build --api="gl=2.1" --extensions="" --generator="c"
// g++ example/c++/sdl.cpp build/src/glad.c -Ibuild/include -lSDL2 -ldl
#include <iostream>
#include <glad/glad.h>
#include <SDL2/SDL.h>
int main(int argc, char **argv) {
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
std::cerr << "SDL2 video subsystem couldn't be initialized. Error: "
<< SDL_GetError()
<< std::endl;
exit(1);
}
SDL_Window* window = SDL_CreateWindow("Glad Sample",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
800, 600, SDL_WINDOW_SHOWN |
SDL_WINDOW_OPENGL);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1,
SDL_RENDERER_ACCELERATED);
if (renderer == nullptr) {
std::cerr << "SDL2 Renderer couldn't be created. Error: "
<< SDL_GetError()
<< std::endl;
exit(1);
}
// Create a OpenGL context on SDL2
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
// Load GL extensions using glad
if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress)) {
std::cerr << "Failed to initialize the OpenGL context." << std::endl;
exit(1);
}
// Loaded OpenGL successfully.
std::cout << "OpenGL version loaded: " << GLVersion.major << "."
<< GLVersion.minor << std::endl;
// Create an event handler
SDL_Event event;
// Loop condition
bool running = true;
while (running) {
SDL_PollEvent(&event);
switch (event.type) {
case SDL_QUIT:
running = false;
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_ESCAPE:
running = false;
break;
}
}
glClearColor(0, 0, 0, 1);
// You'd want to use modern OpenGL here
glColor3d(0, 1, 0);
glBegin(GL_TRIANGLES);
glVertex2f(.2, 0);
glVertex2f(.01, .2);
glVertex2f(-.2, 0);
glEnd();
SDL_GL_SwapWindow(window);
}
// Destroy everything to not leak memory.
SDL_GL_DeleteContext(gl_context);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
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