/* Simple program:  Move N sprites around on the screen as fast as possible */

#include <stdlib.h>

#include <stdio.h>

#include <time.h>

#include "common.h"

#define NUM_SPRITES	100

#define MAX_SPEED 	1

#define BACKGROUND  0x00FFFFFF

static CommonState *state;

static int num_sprites;

static SDL_TextureID *sprites;

static SDL_Rect *positions;

static SDL_Rect *velocities;

static int sprite_w, sprite_h;

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

static void

quit(int rc)

{

    if (sprites) {

        SDL_free(sprites);

    }

    if (positions) {

        SDL_free(positions);

    }

    if (velocities) {

        SDL_free(velocities);

    }

    CommonQuit(state);

    exit(rc);

}

int

LoadSprite(char *file)

{

    int i;

    SDL_Surface *temp;

    /* Load the sprite image */

    temp = SDL_LoadBMP(file);

    if (temp == NULL) {

        fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());

        return (-1);

    }

    sprite_w = temp->w;

    sprite_h = temp->h;

    /* Set transparent pixel as the pixel at (0,0) */

    if (temp->format->palette) {

        SDL_SetColorKey(temp, SDL_SRCCOLORKEY, *(Uint8 *) temp->pixels);

    }

    /* Create textures from the image */

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

        SDL_SelectRenderer(state->windows[i]);

        sprites[i] =

            SDL_CreateTextureFromSurface(0, SDL_TextureAccess_Remote, temp);

        if (!sprites[i]) {

            fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());

            SDL_FreeSurface(temp);

            return (-1);

        }

    }

    SDL_FreeSurface(temp);

    /* We're ready to roll. :) */

    return (0);

}

void

MoveSprites(SDL_WindowID window, SDL_TextureID sprite)

{

    int i, n;

    int window_w, window_h;

    SDL_Rect area, *position, *velocity;

    SDL_SelectRenderer(window);

    /* Query the sizes */

    SDL_GetWindowSize(window, &window_w, &window_h);

    /* Move the sprite, bounce at the wall, and draw */

    n = 0;

    SDL_RenderFill(NULL, BACKGROUND);

    /*

       for (i = 0; i < num_sprites; ++i) {

       position = &positions[i];

       SDL_RenderFill(position, BACKGROUND);

       }

     */

    for (i = 0; i < num_sprites; ++i) {

        position = &positions[i];

        velocity = &velocities[i];

        position->x += velocity->x;

        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {

            velocity->x = -velocity->x;

            position->x += velocity->x;

        }

        position->y += velocity->y;

        if ((position->y < 0) || (position->y >= (window_h - sprite_w))) {

            velocity->y = -velocity->y;

            position->y += velocity->y;

        }

        /* Blit the sprite onto the screen */

        SDL_RenderCopy(sprite, NULL, position, SDL_TextureBlendMode_Mask,

                       SDL_TextureScaleMode_None);

    }

    /* Update the screen! */

    SDL_RenderPresent();

}

int

main(int argc, char *argv[])

{

    int i, done;

    SDL_Event event;

    Uint32 then, now, frames;

    /* Initialize parameters */

    num_sprites = NUM_SPRITES;

    /* 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) {

            fprintf(stderr, "Usage: %s %s", argv[0], CommonUsage(state));

            quit(1);

        }

        i += consumed;

    }

    if (!CommonInit(state)) {

        quit(2);

    }

    /* Create the windows, initialize the renderers, and load the textures */

    sprites =

        (SDL_TextureID *) SDL_malloc(state->num_windows * sizeof(*sprites));

    if (!sprites) {

        fprintf(stderr, "Out of memory!\n");

        quit(2);

    }

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

        SDL_SelectRenderer(state->windows[i]);

        SDL_RenderFill(NULL, BACKGROUND);

    }

    if (LoadSprite("icon.bmp") < 0) {

        quit(2);

    }

    /* Allocate memory for the sprite info */

    positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));

    velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));

    if (!positions || !velocities) {

        fprintf(stderr, "Out of memory!\n");

        quit(2);

    }

    srand(time(NULL));

    for (i = 0; i < num_sprites; ++i) {

        positions[i].x = rand() % (state->window_w - sprite_w);

        positions[i].y = rand() % (state->window_h - sprite_h);

        positions[i].w = sprite_w;

        positions[i].h = sprite_h;

        velocities[i].x = 0;

        velocities[i].y = 0;

        while (!velocities[i].x && !velocities[i].y) {

            velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;

            velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;

        }

    }

    frames = 0;

    then = SDL_GetTicks();

    done = 0;

    while (!done) {

        /* Check for events */

        ++frames;

        while (SDL_PollEvent(&event)) {

            CommonEvent(state, &event, &done);

            switch (event.type) {

            case SDL_WINDOWEVENT:

                switch (event.window.event) {

                case SDL_WINDOWEVENT_EXPOSED:

                    SDL_SelectRenderer(event.window.windowID);

                    SDL_RenderFill(NULL, BACKGROUND);

                    break;

                }

                break;

            default:

                break;

            }

        }

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

            MoveSprites(state->windows[i], sprites[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);

}

/* vi: set ts=4 sw=4 expandtab: */