test/testviewport.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Fri, 04 Apr 2014 23:56:15 +0200
changeset 8692 715d401184a2
parent 8149 681eb46b8ac4
child 9278 8900afb78a19
permissions -rw-r--r--
Removed unused variable from test program.
     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:  Check viewports */
    13 
    14 #include <stdlib.h>
    15 #include <stdio.h>
    16 #include <time.h>
    17 
    18 #include "SDL_test.h"
    19 #include "SDL_test_common.h"
    20 
    21 
    22 static SDLTest_CommonState *state;
    23 
    24 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
    25 static void
    26 quit(int rc)
    27 {
    28     SDLTest_CommonQuit(state);
    29     exit(rc);
    30 }
    31 
    32 void
    33 DrawOnViewport(SDL_Renderer * renderer, SDL_Rect viewport)
    34 {    
    35     SDL_Rect rect;
    36 
    37     /* Set the viewport */
    38     SDL_RenderSetViewport(renderer, &viewport);
    39     
    40     /* Draw a gray background */
    41     SDL_SetRenderDrawColor(renderer, 0x80, 0x80, 0x80, 0xFF);
    42     SDL_RenderClear(renderer);
    43 
    44     /* Test inside points */
    45     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xF, 0xFF);
    46     SDL_RenderDrawPoint(renderer, viewport.h/2 + 10, viewport.w/2);
    47     SDL_RenderDrawPoint(renderer, viewport.h/2 - 10, viewport.w/2);
    48     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 - 10);
    49     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 + 10);
    50 
    51     /* Test horizontal and vertical lines */
    52     SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
    53     SDL_RenderDrawLine(renderer, 1, 0, viewport.w-2, 0);
    54     SDL_RenderDrawLine(renderer, 1, viewport.h-1, viewport.w-2, viewport.h-1);
    55     SDL_RenderDrawLine(renderer, 0, 1, 0, viewport.h-2);
    56     SDL_RenderDrawLine(renderer, viewport.w-1, 1, viewport.w-1, viewport.h-2);
    57 
    58     /* Test diagonal lines */
    59     SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xFF, 0xFF);
    60     SDL_RenderDrawLine(renderer, 0, 0,
    61                        viewport.w-1, viewport.h-1);
    62     SDL_RenderDrawLine(renderer, viewport.w-1, 0,
    63                        0, viewport.h-1);                      
    64 
    65     /* Test outside points */
    66     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xF, 0xFF);
    67     SDL_RenderDrawPoint(renderer, viewport.h/2 + viewport.h, viewport.w/2);
    68     SDL_RenderDrawPoint(renderer, viewport.h/2 - viewport.h, viewport.w/2);
    69     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 - viewport.w);
    70     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 + viewport.w);
    71 
    72     /* Add a box at the top */
    73     rect.w = 8;
    74     rect.h = 8;
    75     rect.x = (viewport.w - rect.w) / 2;
    76     rect.y = 0;
    77     SDL_RenderFillRect(renderer, &rect);
    78 }
    79 
    80 int
    81 main(int argc, char *argv[])
    82 {
    83     int i, j, done;
    84     SDL_Event event;
    85     Uint32 then, now, frames;
    86     SDL_Rect viewport;
    87     SDL_bool use_target = SDL_FALSE;
    88 
    89     /* Initialize test framework */
    90     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    91     if (!state) {
    92         return 1;
    93     }
    94 
    95     for (i = 1; i < argc;) {
    96         int consumed;
    97 
    98         consumed = SDLTest_CommonArg(state, i);
    99         if (consumed == 0) {
   100             consumed = -1;
   101             if (SDL_strcasecmp(argv[i], "--target") == 0) {
   102                 use_target = SDL_TRUE;
   103                 consumed = 1;
   104             }
   105         }
   106         if (consumed < 0) {
   107             SDL_Log("Usage: %s %s [--target]\n",
   108                     argv[0], SDLTest_CommonUsage(state));
   109             quit(1);
   110         }
   111         i += consumed;
   112     }
   113     if (!SDLTest_CommonInit(state)) {
   114         quit(2);
   115     }
   116 
   117     if (use_target) {
   118         int w, h;
   119 
   120         for (i = 0; i < state->num_windows; ++i) {
   121             SDL_GetWindowSize(state->windows[i], &w, &h);
   122             state->targets[i] = SDL_CreateTexture(state->renderers[i], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
   123             SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
   124         }
   125     }
   126 
   127     for (i = 0; i < state->num_windows; ++i) {
   128         SDL_Renderer *renderer = state->renderers[i];
   129         SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
   130         SDL_RenderClear(renderer);
   131     }
   132 
   133     /* Main render loop */
   134     frames = 0;
   135     then = SDL_GetTicks();
   136     done = 0;
   137     j = 0;
   138     while (!done) {
   139         /* Check for events */
   140         ++frames;
   141         while (SDL_PollEvent(&event)) {
   142             SDLTest_CommonEvent(state, &event, &done);
   143         }
   144         
   145         /* Move a viewport box in steps around the screen */                
   146         viewport.x = j * 100;
   147         viewport.y = viewport.x;
   148         viewport.w = 100 + j * 50;
   149         viewport.h = 100 + j * 50;
   150         j = (j + 1) % 4;            
   151         SDL_Log("Current Viewport x=%i y=%i w=%i h=%i", viewport.x, viewport.y, viewport.w, viewport.h);
   152         
   153         for (i = 0; i < state->num_windows; ++i) {
   154             if (state->windows[i] == NULL)
   155                 continue;
   156                 
   157             /* Draw using viewport */        
   158             DrawOnViewport(state->renderers[i], viewport);
   159 
   160             /* Update the screen! */
   161             if (use_target) {
   162                 SDL_SetRenderTarget(state->renderers[i], NULL);
   163                 SDL_RenderCopy(state->renderers[i], state->targets[i], NULL, NULL);
   164                 SDL_RenderPresent(state->renderers[i]);
   165                 SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
   166             } else {
   167                 SDL_RenderPresent(state->renderers[i]);
   168             }
   169         }
   170         
   171         SDL_Delay(1000);
   172     }
   173 
   174     /* Print out some timing information */
   175     now = SDL_GetTicks();
   176     if (now > then) {
   177         double fps = ((double) frames * 1000) / (now - then);
   178         SDL_Log("%2.2f frames per second\n", fps);
   179     }
   180     quit(0);
   181     return 0;
   182 }
   183 
   184 /* vi: set ts=4 sw=4 expandtab: */