test/testrendertarget.c

   1 /*
   2   Copyright (C) 1997-2018 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 #ifdef __EMSCRIPTEN__
  19 #include <emscripten/emscripten.h>
  20 #endif
  21
  22 #include "SDL_test_common.h"
  23 #define WINDOW_WIDTH 720
  24 #define WINDOW_HEIGHT 1280
  25
  26 static SDLTest_CommonState *state;
  27
  28 typedef struct {
  29     SDL_Window *window;
  30     SDL_Renderer *renderer;
  31     SDL_Texture *background;
  32     SDL_Texture *sprite;
  33     SDL_Rect sprite_rect;
  34     int scale_direction;
  35 } DrawState;
  36
  37 DrawState *drawstates;
  38 int done;
  39 SDL_bool test_composite = SDL_FALSE;
  40
  41 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
  42 static void
  43 quit(int rc)
  44 {
  45     SDLTest_CommonQuit(state);
  46     exit(rc);
  47 }
  48
  49 SDL_Texture *
  50 LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
  51 {
  52     SDL_Surface *temp;
  53     SDL_Texture *texture;
  54
  55     /* Load the sprite image */
  56     temp = SDL_LoadBMP(file);
  57     if (temp == NULL) {
  58         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
  59         return NULL;
  60     }
  61
  62     /* Set transparent pixel as the pixel at (0,0) */
  63     if (transparent) {
  64         if (temp->format->palette) {
  65             SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
  66         } else {
  67             switch (temp->format->BitsPerPixel) {
  68             case 15:
  69                 SDL_SetColorKey(temp, SDL_TRUE,
  70                                 (*(Uint16 *) temp->pixels) & 0x00007FFF);
  71                 break;
  72             case 16:
  73                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
  74                 break;
  75             case 24:
  76                 SDL_SetColorKey(temp, SDL_TRUE,
  77                                 (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
  78                 break;
  79             case 32:
  80                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
  81                 break;
  82             }
  83         }
  84     }
  85
  86     /* Create textures from the image */
  87     texture = SDL_CreateTextureFromSurface(renderer, temp);
  88     if (!texture) {
  89         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
  90         SDL_FreeSurface(temp);
  91         return NULL;
  92     }
  93     SDL_FreeSurface(temp);
  94
  95     /* We're ready to roll. :) */
  96     return texture;
  97 }
  98
  99 SDL_bool
 100 DrawComposite(DrawState *s)
 101 {
 102     SDL_Rect viewport, R;
 103     SDL_Texture *target;
 104
 105     static SDL_bool blend_tested = SDL_FALSE;
 106     if (!blend_tested) {
 107         SDL_Texture *A, *B;
 108         Uint32 P;
 109
 110         A = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);
 111         SDL_SetTextureBlendMode(A, SDL_BLENDMODE_BLEND);
 112
 113         B = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);
 114         SDL_SetTextureBlendMode(B, SDL_BLENDMODE_BLEND);
 115
 116         SDL_SetRenderTarget(s->renderer, A);
 117         SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x80);
 118         SDL_RenderFillRect(s->renderer, NULL);
 119
 120         SDL_SetRenderTarget(s->renderer, B);
 121         SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);
 122         SDL_RenderFillRect(s->renderer, NULL);
 123         SDL_RenderCopy(s->renderer, A, NULL, NULL);
 124         SDL_RenderReadPixels(s->renderer, NULL, SDL_PIXELFORMAT_ARGB8888, &P, sizeof(P));
 125
 126         SDL_Log("Blended pixel: 0x%8.8X\n", P);
 127
 128         SDL_DestroyTexture(A);
 129         SDL_DestroyTexture(B);
 130         blend_tested = SDL_TRUE;
 131     }
 132
 133     SDL_RenderGetViewport(s->renderer, &viewport);
 134
 135     target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
 136     SDL_SetTextureBlendMode(target, SDL_BLENDMODE_BLEND);
 137     SDL_SetRenderTarget(s->renderer, target);
 138
 139     /* Draw the background.
 140        This is solid black so when the sprite is copied to it, any per-pixel alpha will be blended through.
 141      */
 142     SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);
 143     SDL_RenderFillRect(s->renderer, NULL);
 144
 145     /* Scale and draw the sprite */
 146     s->sprite_rect.w += s->scale_direction;
 147     s->sprite_rect.h += s->scale_direction;
 148     if (s->scale_direction > 0) {
 149         if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
 150             s->scale_direction = -1;
 151         }
 152     } else {
 153         if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
 154             s->scale_direction = 1;
 155         }
 156     }
 157     s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
 158     s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
 159
 160     SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);
 161
 162     SDL_SetRenderTarget(s->renderer, NULL);
 163     SDL_RenderCopy(s->renderer, s->background, NULL, NULL);
 164
 165     SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_BLEND);
 166     SDL_SetRenderDrawColor(s->renderer, 0xff, 0x00, 0x00, 0x80);
 167     R.x = 0;
 168     R.y = 0;
 169     R.w = 100;
 170     R.h = 100;
 171     SDL_RenderFillRect(s->renderer, &R);
 172     SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_NONE);
 173
 174     SDL_RenderCopy(s->renderer, target, NULL, NULL);
 175     SDL_DestroyTexture(target);
 176
 177     /* Update the screen! */
 178     SDL_RenderPresent(s->renderer);
 179     return SDL_TRUE;
 180 }
 181
 182 SDL_bool
 183 Draw(DrawState *s)
 184 {
 185     SDL_Rect viewport;
 186     SDL_Texture *target;
 187
 188     SDL_RenderGetViewport(s->renderer, &viewport);
 189
 190     target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
 191     if (!target) {
 192         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create render target texture: %s\n", SDL_GetError());
 193         return SDL_FALSE;
 194     }
 195     SDL_SetRenderTarget(s->renderer, target);
 196
 197     /* Draw the background */
 198     SDL_RenderCopy(s->renderer, s->background, NULL, NULL);
 199
 200     /* Scale and draw the sprite */
 201     s->sprite_rect.w += s->scale_direction;
 202     s->sprite_rect.h += s->scale_direction;
 203     if (s->scale_direction > 0) {
 204         if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
 205             s->scale_direction = -1;
 206         }
 207     } else {
 208         if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
 209             s->scale_direction = 1;
 210         }
 211     }
 212     s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
 213     s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
 214
 215     SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);
 216
 217     SDL_SetRenderTarget(s->renderer, NULL);
 218     SDL_RenderCopy(s->renderer, target, NULL, NULL);
 219     SDL_DestroyTexture(target);
 220
 221     /* Update the screen! */
 222     SDL_RenderPresent(s->renderer);
 223     return SDL_TRUE;
 224 }
 225
 226 void
 227 loop()
 228 {
 229     int i;
 230     SDL_Event event;
 231
 232     /* Check for events */
 233     while (SDL_PollEvent(&event)) {
 234         SDLTest_CommonEvent(state, &event, &done);
 235                 switch(event.type) {
 236                 case SDL_KEYDOWN:
 237                         if(event.key.keysym.sym == 0)
 238                         {
 239                                 done = 1;
 240                         }
 241                         break;
 242         }
 243     }
 244     for (i = 0; i < state->num_windows; ++i) {
 245         if (state->windows[i] == NULL)
 246             continue;
 247         if (test_composite) {
 248             if (!DrawComposite(&drawstates[i])) done = 1;
 249         } else {
 250             if (!Draw(&drawstates[i])) done = 1;
 251         }
 252     }
 253 #ifdef __EMSCRIPTEN__
 254     if (done) {
 255         emscripten_cancel_main_loop();
 256     }
 257 #endif
 258 }
 259
 260 int
 261 main(int argc, char *argv[])
 262 {
 263     int i;
 264     int frames;
 265     Uint32 then, now;
 266
 267     /* Enable standard application logging */
 268     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
 269
 270     /* Initialize test framework */
 271     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
 272         state->window_w = WINDOW_WIDTH;
 273     state->window_h = WINDOW_HEIGHT;
 274     if (!state) {
 275         return 1;
 276     }
 277     for (i = 1; i < argc;) {
 278         int consumed;
 279
 280         consumed = SDLTest_CommonArg(state, i);
 281         if (consumed == 0) {
 282             consumed = -1;
 283             if (SDL_strcasecmp(argv[i], "--composite") == 0) {
 284                 test_composite = SDL_TRUE;
 285                 consumed = 1;
 286             }
 287         }
 288         if (consumed < 0) {
 289             SDL_Log("Usage: %s %s [--composite]\n",
 290                     argv[0], SDLTest_CommonUsage(state));
 291             quit(1);
 292         }
 293         i += consumed;
 294     }
 295     if (!SDLTest_CommonInit(state)) {
 296         quit(2);
 297     }
 298
 299     drawstates = SDL_stack_alloc(DrawState, state->num_windows);
 300     for (i = 0; i < state->num_windows; ++i) {
 301         DrawState *drawstate = &drawstates[i];
 302
 303         drawstate->window = state->windows[i];
 304         drawstate->renderer = state->renderers[i];
 305         if (test_composite) {
 306             drawstate->sprite = LoadTexture(drawstate->renderer, "res/icon-alpha.bmp", SDL_TRUE);
 307         } else {
 308             drawstate->sprite = LoadTexture(drawstate->renderer, "res/icon.bmp", SDL_TRUE);
 309         }
 310         drawstate->background = LoadTexture(drawstate->renderer, "res/sample.bmp", SDL_FALSE);
 311         if (!drawstate->sprite || !drawstate->background) {
 312             quit(2);
 313         }
 314         SDL_QueryTexture(drawstate->sprite, NULL, NULL,
 315                          &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
 316         drawstate->scale_direction = 1;
 317     }
 318
 319     /* Main render loop */
 320     frames = 0;
 321     then = SDL_GetTicks();
 322     done = 0;
 323
 324 #ifdef __EMSCRIPTEN__
 325     emscripten_set_main_loop(loop, 0, 1);
 326 #else
 327     while (!done) {
 328         ++frames;
 329         loop();
 330     }
 331 #endif
 332
 333     /* Print out some timing information */
 334     now = SDL_GetTicks();
 335     if (now > then) {
 336         double fps = ((double) frames * 1000) / (now - then);
 337         SDL_Log("%2.2f frames per second\n", fps);
 338     }
 339
 340     SDL_stack_free(drawstates);
 341
 342     quit(0);
 343     return 0;
 344 }
 345
 346 /* vi: set ts=4 sw=4 expandtab: */