#include <SDL.h>
#include <oglplus/gl.hpp>
#include <oglplus/all.hpp>

using namespace oglplus;

#define WIDTH 800
#define HEIGHT 600

static void init();
static void display(SDL_Window * window);

int main(int argc, char * argv[])
{
    if (SDL_Init(SDL_INIT_VIDEO))
    {
        printf("Failed to initialize SDL!\n");
        return 1;
    }

    atexit(SDL_Quit);

    SDL_Window * window = SDL_CreateWindow("OGLplus example",
                                           SDL_WINDOWPOS_UNDEFINED,
                                           SDL_WINDOWPOS_UNDEFINED,
                                           WIDTH,
                                           HEIGHT,
                                           SDL_WINDOW_OPENGL);
    if (!window)
    {
        printf("Failed to create window!\n");
        SDL_Quit();
        return 1;
    }

    SDL_GLContext gl_context = SDL_GL_CreateContext(window);

    init();
    display(window);

    SDL_Event event;
    while (SDL_WaitEvent(&event))
    {
        if (event.type == SDL_QUIT)
            break;
        else if (event.type == SDL_KEYDOWN)
        {
            if (event.key.keysym.sym == SDLK_ESCAPE)
                break;
            if (event.key.keysym.sym == SDLK_RETURN)
                display(window);
        }
    }

    return 0;
}

static void init()
{
    VertexShader vs;
    FragmentShader fs;
    Program program;
    VertexArray cube;
    Buffer verts;

    vs.Source("#version 330\n"
              "uniform mat4 projection;\n"
              "uniform mat4 modelview;\n"
              "in vec4 position;\n"
              "in vec3 normal;\n"
              "in vec2 texture;\n"
              "out vec3 normal_i;\n"
              "out vec2 texture_i;\n"
              "void main(void)\n"
              "{\n"
              "  normal_i = normal;\n"
              "  texture_i = texture;\n"
              "  gl_Position = projection * modelview * position\n"
              "}");
    vs.Compile();
    fs.Source("#version 330\n"
              "in vec3 normal_i;\n"
              "in vec2 texture_i;\n"
              "out vec4 frag_color;\n"
              "void main(void)\n"
              "{\n"
              "  frag_color = vec4(texture_i, 1.0, 1.0);\n"
              "}");
    fs.Compile();
}

static void display(SDL_Window * window)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    SDL_GL_SwapWindow(window);
}