/*

   Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied

   warranty.  In no event will the authors be held liable for any damages

   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,

   including commercial applications, and to alter it and redistribute it

   freely.

 */

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

 #include <stdlib.h>

 #include <stdio.h>

 #include <time.h>

 #include "SDL.h"

 #include "common.h"

 #define WINDOW_WIDTH    640

 #define WINDOW_HEIGHT   480

 static CommonState *state;

 typedef struct {

     SDL_Window *window;

     SDL_Renderer *renderer;

     SDL_Texture *background;

     SDL_Texture *sprite;

     SDL_Rect sprite_rect;

     int scale_direction;

 } DrawState;

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

 static void

 quit(int rc)

 {

     CommonQuit(state);

     exit(rc);

 }

 SDL_Texture *

 LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)

 {

     SDL_Surface *temp;

     SDL_Texture *texture;

     /* Load the sprite image */

     temp = SDL_LoadBMP(file);

     if (temp == NULL) {

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

         return NULL;

     }

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

     if (transparent) {

         if (temp->format->palette) {

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

         } else {

             switch (temp->format->BitsPerPixel) {

             case 15:

                 SDL_SetColorKey(temp, SDL_TRUE,

                                 (*(Uint16 *) temp->pixels) & 0x00007FFF);

                 break;

             case 16:

                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);

                 break;

             case 24:

                 SDL_SetColorKey(temp, SDL_TRUE,

                                 (*(Uint32 *) temp->pixels) & 0x00FFFFFF);

                 break;

             case 32:

                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);

                 break;

             }

         }

     }

     /* Create textures from the image */

     texture = SDL_CreateTextureFromSurface(renderer, temp);

     if (!texture) {

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

         SDL_FreeSurface(temp);

         return NULL;

     }

     SDL_FreeSurface(temp);

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

     return texture;

 }

 void

 Draw(DrawState *s)

 {

     SDL_Rect viewport;

     SDL_Texture *target;

     SDL_Point *center=NULL;

     SDL_Point origin = {0,0};

     SDL_RenderGetViewport(s->renderer, &viewport);

     target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);

     SDL_SetRenderTarget(s->renderer, target);

     /* Draw the background */

     SDL_RenderCopy(s->renderer, s->background, NULL, NULL);

     /* Scale and draw the sprite */

     s->sprite_rect.w += s->scale_direction;

     s->sprite_rect.h += s->scale_direction;

     if (s->scale_direction > 0) {

         center = &origin;

         if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {

             s->scale_direction = -1;

         }

     } else {

         if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {

             s->scale_direction = 1;

         }

     }

     s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;

     s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;

     SDL_RenderCopyEx(s->renderer, s->sprite, NULL, &s->sprite_rect, (double)s->sprite_rect.w, center, s->scale_direction);

     SDL_SetRenderTarget(s->renderer, NULL);

     SDL_RenderCopy(s->renderer, target, NULL, NULL);

     SDL_DestroyTexture(target);

     /* Update the screen! */

     SDL_RenderPresent(s->renderer);

     //SDL_Delay(10);

 }

 int

 main(int argc, char *argv[])

 {

     DrawState *drawstates;

     int i, done;

     SDL_Event event;

     int frames;

     Uint32 then, now;

     /* 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\n", argv[0], CommonUsage(state));

             return 1;

         }

         i += consumed;

     }

     if (!CommonInit(state)) {

         quit(2);

     }

     drawstates = SDL_stack_alloc(DrawState, state->num_windows);

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

         DrawState *drawstate = &drawstates[i];

         drawstate->window = state->windows[i];

         drawstate->renderer = state->renderers[i];

         drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", SDL_TRUE);

         drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", SDL_FALSE);

         if (!drawstate->sprite || !drawstate->background) {

             quit(2);

         }

         SDL_QueryTexture(drawstate->sprite, NULL, NULL,

                          &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);

         drawstate->scale_direction = 1;

     }

     /* 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) {

             Draw(&drawstates[i]);

         }

     }

     /* Print out some timing information */

     now = SDL_GetTicks();

     if (now > then) {

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

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

     }

     SDL_stack_free(drawstates);

     quit(0);

     return 0;

 }

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