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test/testrendertarget.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 02 Feb 2014 00:53:27 -0800
changeset 8149 681eb46b8ac4
parent 7787 e6f3e8fc96ea
child 9278 8900afb78a19
permissions -rw-r--r--
Fixed bug 2374 - Update copyright for 2014...

Is it that time already?? 
     1 /*

     2   Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>

     3 

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

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

     6   arising from the use of this software.

     7 

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

     9   including commercial applications, and to alter it and redistribute it

    10   freely.

    11 */

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

    13 

    14 #include <stdlib.h>

    15 #include <stdio.h>

    16 #include <time.h>

    17 

    18 #include "SDL_test_common.h"

    19 

    20 

    21 static SDLTest_CommonState *state;

    22 

    23 typedef struct {

    24     SDL_Window *window;

    25     SDL_Renderer *renderer;

    26     SDL_Texture *background;

    27     SDL_Texture *sprite;

    28     SDL_Rect sprite_rect;

    29     int scale_direction;

    30 } DrawState;

    31 

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

    33 static void

    34 quit(int rc)

    35 {

    36     SDLTest_CommonQuit(state);

    37     exit(rc);

    38 }

    39 

    40 SDL_Texture *

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

    42 {

    43     SDL_Surface *temp;

    44     SDL_Texture *texture;

    45 

    46     /* Load the sprite image */

    47     temp = SDL_LoadBMP(file);

    48     if (temp == NULL) {

    49         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());

    50         return NULL;

    51     }

    52 

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

    54     if (transparent) {

    55         if (temp->format->palette) {

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

    57         } else {

    58             switch (temp->format->BitsPerPixel) {

    59             case 15:

    60                 SDL_SetColorKey(temp, SDL_TRUE,

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

    62                 break;

    63             case 16:

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

    65                 break;

    66             case 24:

    67                 SDL_SetColorKey(temp, SDL_TRUE,

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

    69                 break;

    70             case 32:

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

    72                 break;

    73             }

    74         }

    75     }

    76 

    77     /* Create textures from the image */

    78     texture = SDL_CreateTextureFromSurface(renderer, temp);

    79     if (!texture) {

    80         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());

    81         SDL_FreeSurface(temp);

    82         return NULL;

    83     }

    84     SDL_FreeSurface(temp);

    85 

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

    87     return texture;

    88 }

    89 

    90 SDL_bool

    91 DrawComposite(DrawState *s)

    92 {

    93     SDL_Rect viewport, R;

    94     SDL_Texture *target;

    95 

    96     static SDL_bool blend_tested = SDL_FALSE;

    97     if (!blend_tested) {

    98         SDL_Texture *A, *B;

    99         Uint32 P;

   100 

   101         A = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);

   102         SDL_SetTextureBlendMode(A, SDL_BLENDMODE_BLEND);

   103 

   104         B = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);

   105         SDL_SetTextureBlendMode(B, SDL_BLENDMODE_BLEND);

   106 

   107         SDL_SetRenderTarget(s->renderer, A);

   108         SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x80);

   109         SDL_RenderFillRect(s->renderer, NULL);

   110 

   111         SDL_SetRenderTarget(s->renderer, B);

   112         SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);

   113         SDL_RenderFillRect(s->renderer, NULL);

   114         SDL_RenderCopy(s->renderer, A, NULL, NULL);

   115         SDL_RenderReadPixels(s->renderer, NULL, SDL_PIXELFORMAT_ARGB8888, &P, sizeof(P));

   116 

   117         SDL_Log("Blended pixel: 0x%8.8X\n", P);

   118 

   119         SDL_DestroyTexture(A);

   120         SDL_DestroyTexture(B);

   121         blend_tested = SDL_TRUE;

   122     }

   123 

   124     SDL_RenderGetViewport(s->renderer, &viewport);

   125 

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

   127     SDL_SetTextureBlendMode(target, SDL_BLENDMODE_BLEND);

   128     SDL_SetRenderTarget(s->renderer, target);

   129 

   130     /* Draw the background.

   131        This is solid black so when the sprite is copied to it, any per-pixel alpha will be blended through.

   132      */

   133     SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);

   134     SDL_RenderFillRect(s->renderer, NULL);

   135 

   136     /* Scale and draw the sprite */

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

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

   139     if (s->scale_direction > 0) {

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

   141             s->scale_direction = -1;

   142         }

   143     } else {

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

   145             s->scale_direction = 1;

   146         }

   147     }

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

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

   150 

   151     SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);

   152 

   153     SDL_SetRenderTarget(s->renderer, NULL);

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

   155 

   156     SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_BLEND);

   157     SDL_SetRenderDrawColor(s->renderer, 0xff, 0x00, 0x00, 0x80);

   158     R.x = 0;

   159     R.y = 0;

   160     R.w = 100;

   161     R.h = 100;

   162     SDL_RenderFillRect(s->renderer, &R);

   163     SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_NONE);

   164 

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

   166     SDL_DestroyTexture(target);

   167 

   168     /* Update the screen! */

   169     SDL_RenderPresent(s->renderer);

   170     return SDL_TRUE;

   171 }

   172 

   173 SDL_bool

   174 Draw(DrawState *s)

   175 {

   176     SDL_Rect viewport;

   177     SDL_Texture *target;

   178 

   179     SDL_RenderGetViewport(s->renderer, &viewport);

   180 

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

   182     if (!target) {

   183         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create render target texture: %s\n", SDL_GetError());

   184         return SDL_FALSE;

   185     }

   186     SDL_SetRenderTarget(s->renderer, target);

   187 

   188     /* Draw the background */

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

   190 

   191     /* Scale and draw the sprite */

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

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

   194     if (s->scale_direction > 0) {

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

   196             s->scale_direction = -1;

   197         }

   198     } else {

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

   200             s->scale_direction = 1;

   201         }

   202     }

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

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

   205 

   206     SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);

   207 

   208     SDL_SetRenderTarget(s->renderer, NULL);

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

   210     SDL_DestroyTexture(target);

   211 

   212     /* Update the screen! */

   213     SDL_RenderPresent(s->renderer);

   214     return SDL_TRUE;

   215 }

   216 

   217 int

   218 main(int argc, char *argv[])

   219 {

   220     DrawState *drawstates;

   221     int i, done;

   222     SDL_Event event;

   223     int frames;

   224     Uint32 then, now;

   225     SDL_bool test_composite = SDL_FALSE;

   226 

   227     /* Enable standard application logging */

   228     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

   229 

   230     /* Initialize test framework */

   231     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);

   232     if (!state) {

   233         return 1;

   234     }

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

   236         int consumed;

   237 

   238         consumed = SDLTest_CommonArg(state, i);

   239         if (consumed == 0) {

   240             consumed = -1;

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

   242                 test_composite = SDL_TRUE;

   243                 consumed = 1;

   244             }

   245         }

   246         if (consumed < 0) {

   247             SDL_Log("Usage: %s %s [--composite]\n",

   248                     argv[0], SDLTest_CommonUsage(state));

   249             quit(1);

   250         }

   251         i += consumed;

   252     }

   253     if (!SDLTest_CommonInit(state)) {

   254         quit(2);

   255     }

   256 

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

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

   259         DrawState *drawstate = &drawstates[i];

   260 

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

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

   263         if (test_composite) {

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

   265         } else {

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

   267         }

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

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

   270             quit(2);

   271         }

   272         SDL_QueryTexture(drawstate->sprite, NULL, NULL,

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

   274         drawstate->scale_direction = 1;

   275     }

   276 

   277     /* Main render loop */

   278     frames = 0;

   279     then = SDL_GetTicks();

   280     done = 0;

   281     while (!done) {

   282         /* Check for events */

   283         ++frames;

   284         while (SDL_PollEvent(&event)) {

   285             SDLTest_CommonEvent(state, &event, &done);

   286         }

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

   288             if (state->windows[i] == NULL)

   289                 continue;

   290             if (test_composite) {

   291                 if (!DrawComposite(&drawstates[i])) done = 1;

   292             } else {

   293                 if (!Draw(&drawstates[i])) done = 1;

   294             }

   295         }

   296     }

   297 

   298     /* Print out some timing information */

   299     now = SDL_GetTicks();

   300     if (now > then) {

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

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

   303     }

   304 

   305     SDL_stack_free(drawstates);

   306 

   307     quit(0);

   308     return 0;

   309 }

   310 

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