test/testrendercopyex.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 23 Apr 2019 07:59:31 -0700
changeset 12714 9b7633bd0aa0
parent 12503 806492103856
child 12732 0280fd2d02ca
permissions -rw-r--r--
Use _Exit() when available
     1 /*
     2   Copyright (C) 1997-2019 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 
    24 
    25 static SDLTest_CommonState *state;
    26 
    27 typedef struct {
    28     SDL_Window *window;
    29     SDL_Renderer *renderer;
    30     SDL_Texture *background;
    31     SDL_Texture *sprite;
    32     SDL_Rect sprite_rect;
    33     int scale_direction;
    34 } DrawState;
    35 
    36 DrawState *drawstates;
    37 int done;
    38 
    39 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
    40 static void
    41 quit(int rc)
    42 {
    43     SDLTest_CommonQuit(state);
    44     exit(rc);
    45 }
    46 
    47 SDL_Texture *
    48 LoadTexture(SDL_Renderer *renderer, const char *file, SDL_bool transparent)
    49 {
    50     SDL_Surface *temp;
    51     SDL_Texture *texture;
    52 
    53     /* Load the sprite image */
    54     temp = SDL_LoadBMP(file);
    55     if (temp == NULL) {
    56         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
    57         return NULL;
    58     }
    59 
    60     /* Set transparent pixel as the pixel at (0,0) */
    61     if (transparent) {
    62         if (temp->format->palette) {
    63             SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
    64         } else {
    65             switch (temp->format->BitsPerPixel) {
    66             case 15:
    67                 SDL_SetColorKey(temp, SDL_TRUE,
    68                                 (*(Uint16 *) temp->pixels) & 0x00007FFF);
    69                 break;
    70             case 16:
    71                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
    72                 break;
    73             case 24:
    74                 SDL_SetColorKey(temp, SDL_TRUE,
    75                                 (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
    76                 break;
    77             case 32:
    78                 SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
    79                 break;
    80             }
    81         }
    82     }
    83 
    84     /* Create textures from the image */
    85     texture = SDL_CreateTextureFromSurface(renderer, temp);
    86     if (!texture) {
    87         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
    88         SDL_FreeSurface(temp);
    89         return NULL;
    90     }
    91     SDL_FreeSurface(temp);
    92 
    93     /* We're ready to roll. :) */
    94     return texture;
    95 }
    96 
    97 void
    98 Draw(DrawState *s)
    99 {
   100     SDL_Rect viewport;
   101     SDL_Texture *target;
   102     SDL_Point *center=NULL;
   103     SDL_Point origin = {0,0};
   104 
   105     SDL_RenderGetViewport(s->renderer, &viewport);
   106 
   107     target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
   108     SDL_SetRenderTarget(s->renderer, target);
   109 
   110     /* Draw the background */
   111     SDL_RenderCopy(s->renderer, s->background, NULL, NULL);
   112 
   113     /* Scale and draw the sprite */
   114     s->sprite_rect.w += s->scale_direction;
   115     s->sprite_rect.h += s->scale_direction;
   116     if (s->scale_direction > 0) {
   117         center = &origin;
   118         if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
   119             s->scale_direction = -1;
   120         }
   121     } else {
   122         if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
   123             s->scale_direction = 1;
   124         }
   125     }
   126     s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
   127     s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
   128 
   129     SDL_RenderCopyEx(s->renderer, s->sprite, NULL, &s->sprite_rect, (double)s->sprite_rect.w, center, (SDL_RendererFlip)s->scale_direction);
   130 
   131     SDL_SetRenderTarget(s->renderer, NULL);
   132     SDL_RenderCopy(s->renderer, target, NULL, NULL);
   133     SDL_DestroyTexture(target);
   134 
   135     /* Update the screen! */
   136     SDL_RenderPresent(s->renderer);
   137     /* SDL_Delay(10); */
   138 }
   139 
   140 void loop()
   141 {
   142     int i;
   143     SDL_Event event;
   144 
   145     /* Check for events */
   146 
   147     while (SDL_PollEvent(&event)) {
   148         SDLTest_CommonEvent(state, &event, &done);
   149     }
   150     for (i = 0; i < state->num_windows; ++i) {
   151         if (state->windows[i] == NULL)
   152             continue;
   153         Draw(&drawstates[i]);
   154     }
   155 #ifdef __EMSCRIPTEN__
   156     if (done) {
   157         emscripten_cancel_main_loop();
   158     }
   159 #endif
   160 }
   161 
   162 int
   163 main(int argc, char *argv[])
   164 {
   165     int i;
   166     int frames;
   167     Uint32 then, now;
   168 
   169     /* Enable standard application logging */
   170     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
   171 
   172     /* Initialize test framework */
   173     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
   174     if (!state) {
   175         return 1;
   176     }
   177     for (i = 1; i < argc;) {
   178         int consumed;
   179 
   180         consumed = SDLTest_CommonArg(state, i);
   181         if (consumed == 0) {
   182             SDL_Log("Usage: %s %s\n", argv[0], SDLTest_CommonUsage(state));
   183             return 1;
   184         }
   185         i += consumed;
   186     }
   187     if (!SDLTest_CommonInit(state)) {
   188         quit(2);
   189     }
   190 
   191     drawstates = SDL_stack_alloc(DrawState, state->num_windows);
   192     for (i = 0; i < state->num_windows; ++i) {
   193         DrawState *drawstate = &drawstates[i];
   194 
   195         drawstate->window = state->windows[i];
   196         drawstate->renderer = state->renderers[i];
   197         drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", SDL_TRUE);
   198         drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", SDL_FALSE);
   199         if (!drawstate->sprite || !drawstate->background) {
   200             quit(2);
   201         }
   202         SDL_QueryTexture(drawstate->sprite, NULL, NULL,
   203                          &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
   204         drawstate->scale_direction = 1;
   205     }
   206 
   207     /* Main render loop */
   208     frames = 0;
   209     then = SDL_GetTicks();
   210     done = 0;
   211 
   212 #ifdef __EMSCRIPTEN__
   213     emscripten_set_main_loop(loop, 0, 1);
   214 #else
   215     while (!done) {
   216         ++frames;
   217         loop();
   218         }
   219 #endif
   220     /* Print out some timing information */
   221     now = SDL_GetTicks();
   222     if (now > then) {
   223         double fps = ((double) frames * 1000) / (now - then);
   224         SDL_Log("%2.2f frames per second\n", fps);
   225     }
   226 
   227     SDL_stack_free(drawstates);
   228 
   229     quit(0);
   230     return 0;
   231 }
   232 
   233 /* vi: set ts=4 sw=4 expandtab: */