// Compile with c++ $(pkg-config --cflags --libs gl sdl2) ssbo_limit.cc -o ssbo_limit
#include <SDL.h>
#define GL_GLEXT_PROTOTYPES 1
#include <GL/gl.h>
#include <cassert>
#include <cstring>

int main()
{
	SDL_Init(SDL_INIT_VIDEO);
	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);
	const Uint32 window_flags = SDL_WINDOW_OPENGL | SDL_WINDOW_HIDDEN;
	SDL_Window * window = SDL_CreateWindow("", 0, 0, 8, 8, window_flags);
	assert(window);
	SDL_GLContext context = SDL_GL_CreateContext(window);
	assert(context);
	
	GLint extension_count;
	glGetIntegerv(GL_NUM_EXTENSIONS, &extension_count);
	bool has_extension = false;
	for (GLint i = 0; i < extension_count; i++)
	{
		const char * const extension = reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i));
		if (std::strcmp("GL_ARB_shader_storage_buffer_object", extension) == 0)
		{
			has_extension = true;
			break;
		}
	}

	if (has_extension)
	{
		GLint max_blocks;
		glGetIntegerv (GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS, &max_blocks);
		// The GL_ARB_shader_storage_buffer_object spec requires at
		// least 8.
		assert(max_blocks >= 8);
	}
}