#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <math.h>

#include "common.h"

#ifdef __IPHONEOS__

#define HAVE_OPENGLES

#endif

#ifdef HAVE_OPENGLES

#include "SDL_opengles.h"

static CommonState *state;

static SDL_GLContext context;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */

static void

quit(int rc)

{

    if (context) {

        /* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */

        SDL_GL_DeleteContext(context);

    }

    CommonQuit(state);

    exit(rc);

}

static void

Render()

{

	static GLubyte color[8][4] = { {255, 0, 0, 0},

		{ 255,	0, 0, 255},

		{	0, 255, 0, 255},

		{	0, 255, 0, 255},

		{	0, 255, 0, 255},

		{ 255, 255, 255, 255},

		{ 255,	0, 255, 255},

		{	0,	0, 255, 255}

    };

    static GLfloat cube[8][3] = { {0.5, 0.5, -0.5},

		{0.5f, -0.5f, -0.5f},

		{-0.5f, -0.5f, -0.5f},

		{-0.5f, 0.5f, -0.5f},

		{-0.5f, 0.5f, 0.5f},

		{0.5f, 0.5f, 0.5f},

		{0.5f, -0.5f, 0.5f},

		{-0.5f, -0.5f, 0.5f}

    };

	static GLubyte indices[36] = { 0, 3, 4,\

								   4, 5, 0,\

								   0, 5, 6,\

								   6, 1, 0,\

								   6, 7, 2,\

								   2, 1, 6,\

								   7, 4, 3,\

								   3, 2, 7,\

								   5, 4, 7,\

								   7, 6, 5,\

								   2, 3, 1,\

								   3, 0, 1 };

    /* Do our drawing, too. */

    glClearColor(0.0, 0.0, 0.0, 1.0);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	/* Draw the cube */

	glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);

	glEnableClientState(GL_COLOR_ARRAY);

	glVertexPointer(3, GL_FLOAT, 0, cube);

	glEnableClientState(GL_VERTEX_ARRAY);

	glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices);

    glMatrixMode(GL_MODELVIEW);

    glRotatef(5.0, 1.0, 1.0, 1.0);

}

int

main(int argc, char *argv[])

{

    int fsaa, accel;

    int value;

    int i, done;

    SDL_DisplayMode mode;

    SDL_Event event;

    Uint32 then, now, frames;

    /* Initialize parameters */

    fsaa = 0;

    accel = 0;

    /* Initialize test framework */

    state = CommonCreateState(argv, SDL_INIT_VIDEO);

    if (!state) {

        return 1;

    }

    for (i = 1; i < argc;) {

        int consumed;

        consumed = CommonArg(state, i);

        if (consumed == 0) {

            if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {

                ++fsaa;

                consumed = 1;

            } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {

                ++accel;

                consumed = 1;

            } else {

                consumed = -1;

            }

        }

        if (consumed < 0) {

            fprintf(stderr, "Usage: %s %s [--fsaa] [--accel]\n", argv[0],

                    CommonUsage(state));

            quit(1);

        }

        i += consumed;

    }

    /* Set OpenGL parameters */

    state->window_flags |= SDL_WINDOW_OPENGL;

    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);

    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);

    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);

    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);

    if (fsaa) {

        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);

        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);

    }

    if (accel) {

        SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);

    }

    if (!CommonInit(state)) {

        quit(2);

    }

    /* Create OpenGL context */

    context = SDL_GL_CreateContext(state->windows[0]);

    if (!context) {

        fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());

        quit(2);

    }

    if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {

        SDL_GL_SetSwapInterval(1);

    } else {

        SDL_GL_SetSwapInterval(0);

    }

    SDL_GetCurrentDisplayMode(&mode);

    printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format));

    printf("\n");

    printf("Vendor     : %s\n", glGetString(GL_VENDOR));

    printf("Renderer   : %s\n", glGetString(GL_RENDERER));

    printf("Version    : %s\n", glGetString(GL_VERSION));

    printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));

    printf("\n");

    SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);

    printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);

    SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);

    printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);

    SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);

    printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);

    SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);

    printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value);

    if (fsaa) {

        SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);

        printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);

        SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);

        printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,

               value);

    }

    if (accel) {

        SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);

        printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);

    }

    /* Set rendering settings */

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrthof(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glShadeModel(GL_SMOOTH);

    /* Main render loop */

    frames = 0;

    then = SDL_GetTicks();

    done = 0;

    while (!done) {

        /* Check for events */

        ++frames;

        while (SDL_PollEvent(&event)) {

            CommonEvent(state, &event, &done);

        }

        for (i = 0; i < state->num_windows; ++i) {

            int w, h;

            SDL_GL_MakeCurrent(state->windows[i], context);

            SDL_GetWindowSize(state->windows[i], &w, &h);

            glViewport(0, 0, w, h);

            Render();

            SDL_GL_SwapWindow(state->windows[i]);

        }

    }

    /* Print out some timing information */

    now = SDL_GetTicks();

    if (now > then) {

        printf("%2.2f frames per second\n",

               ((double) frames * 1000) / (now - then));

    }

    quit(0);

    return 0;

}

#else /* HAVE_OPENGLES */

int

main(int argc, char *argv[])

{

    printf("No OpenGL ES support on this system\n");

    return 1;

}

#endif /* HAVE_OPENGLES */