src/gallium/tests/graw/clear.c

   1 /* Display a cleared blue window.  This demo has no dependencies on
   2  * any utility code, just the graw interface and gallium.
   3  */
   4
   5 #include <stdio.h>
   6 #include "frontend/graw.h"
   7 #include "pipe/p_screen.h"
   8 #include "pipe/p_context.h"
   9 #include "pipe/p_state.h"
  10 #include "pipe/p_defines.h"
  11
  12 enum pipe_format formats[] = {
  13    PIPE_FORMAT_RGBA8888_UNORM,
  14    PIPE_FORMAT_BGRA8888_UNORM,
  15    PIPE_FORMAT_NONE
  16 };
  17
  18 static const int WIDTH = 300;
  19 static const int HEIGHT = 300;
  20
  21 struct pipe_screen *screen;
  22 struct pipe_context *ctx;
  23 struct pipe_surface *surf;
  24 struct pipe_resource *tex;
  25 static void *window = NULL;
  26
  27 static void draw( void )
  28 {
  29    union pipe_color_union clear_color = { {1, 0, 1, 1} };
  30
  31    ctx->clear(ctx, PIPE_CLEAR_COLOR, NULL, &clear_color, 0, 0);
  32    ctx->flush(ctx, NULL, 0);
  33
  34    graw_save_surface_to_file(ctx, surf, NULL);
  35
  36    screen->flush_frontbuffer(screen, tex, 0, 0, window, NULL);
  37 }
  38
  39 static void init( void )
  40 {
  41    struct pipe_framebuffer_state fb;
  42    struct pipe_resource templat;
  43    struct pipe_surface surf_tmpl;
  44    int i;
  45
  46    /* It's hard to say whether window or screen should be created
  47     * first.  Different environments would prefer one or the other.
  48     *
  49     * Also, no easy way of querying supported formats if the screen
  50     * cannot be created first.
  51     */
  52    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
  53       screen = graw_create_window_and_screen(0, 0, 300, 300,
  54                                              formats[i],
  55                                              &window);
  56       if (window && screen)
  57          break;
  58    }
  59    if (!screen || !window) {
  60       fprintf(stderr, "Unable to create window\n");
  61       exit(1);
  62    }
  63
  64    ctx = screen->context_create(screen, NULL, 0);
  65    if (ctx == NULL)
  66       exit(3);
  67
  68    memset(&templat, 0, sizeof(templat));
  69    templat.target = PIPE_TEXTURE_2D;
  70    templat.format = formats[i];
  71    templat.width0 = WIDTH;
  72    templat.height0 = HEIGHT;
  73    templat.depth0 = 1;
  74    templat.array_size = 1;
  75    templat.last_level = 0;
  76    templat.bind = (PIPE_BIND_RENDER_TARGET |
  77                    PIPE_BIND_DISPLAY_TARGET);
  78
  79    tex = screen->resource_create(screen,
  80                                  &templat);
  81    if (tex == NULL)
  82       exit(4);
  83
  84    surf_tmpl.format = templat.format;
  85    surf_tmpl.u.tex.level = 0;
  86    surf_tmpl.u.tex.first_layer = 0;
  87    surf_tmpl.u.tex.last_layer = 0;
  88    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
  89    if (surf == NULL)
  90       exit(5);
  91
  92    memset(&fb, 0, sizeof fb);
  93    fb.nr_cbufs = 1;
  94    fb.width = WIDTH;
  95    fb.height = HEIGHT;
  96    fb.cbufs[0] = surf;
  97
  98    ctx->set_framebuffer_state(ctx, &fb);
  99 }
 100
 101 static void args(int argc, char *argv[])
 102 {
 103    int i;
 104
 105    for (i = 1; i < argc;) {
 106       if (graw_parse_args(&i, argc, argv)) {
 107          continue;
 108       }
 109       exit(1);
 110    }
 111 }
 112
 113 int main( int argc, char *argv[] )
 114 {
 115    args(argc, argv);
 116    init();
 117
 118    graw_set_display_func( draw );
 119    graw_main_loop();
 120    return 0;
 121 }