ShaderlessOpenGL

gistfile1.cpp

#include <SDL.h>
#include <Windows.h>
#include <gl/glew.h>
#include <gl/GL.h>
#include <stdexcept>
#undef main

struct Vector3 {
	float x, y, z;
	Vector3(float _x, float _y, float _z) {
		x = _x;
		y = _y;
		z = _z;
	}
};

int main(int argc, char* argv[]) {
	SDL_Init(SDL_INIT_EVERYTHING);
	SDL_SetVideoMode(800, 600, 16, SDL_OPENGL);
	SDL_Event event;

	GLenum status = glewInit();
	if (status != GLEW_OK)
		throw std::runtime_error(reinterpret_cast<const GLchar*>(status));

	Vector3 vertices[] = {
		Vector3(0.0f,  1.0f, 0.0f),
		Vector3(-1.0f, -1.0f, 0.0f),
		Vector3(1.0f, -1.0f, 0.0f),
	};

	GLuint vbo;
	glGenBuffers(1, &vbo);
	glBindBuffer(GL_ARRAY_BUFFER, vbo);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices, GL_STATIC_DRAW);

	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, nullptr);

	bool running = true;
	while (running) {
		while (SDL_PollEvent(&event)) {
			if (event.type == SDL_QUIT)
				running = false;
			else if (event.type == SDL_KEYDOWN) {
				if (event.key.keysym.sym == SDLK_F4 && SDL_GetModState() & KMOD_ALT)
					running = false;
			}
		}

		glClear(GL_COLOR_BUFFER_BIT);
		glDrawArrays(GL_TRIANGLES, 0, 3);
		SDL_GL_SwapBuffers();
	}
	return 0;
}