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Viewing changes to cogl/tests/conform/test-alpha-test.c

  • Committer: RabbitBot
  • Date: 2018-04-11 14:49:36 UTC
  • Revision ID: rabbitbot@elementary.io-20180411144936-hgymqa9d8d1xfpbh
Initial import, version 3.28.0-2

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cogl/tests/conform/test-alpha-test.c
 
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#include <cogl/cogl.h>
 
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#include <string.h>
 
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#include "test-utils.h"
 
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static CoglTexture2D *
 
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create_texture (CoglContext *context)
 
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{
 
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  static const uint8_t data[] =
 
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    {
 
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      0xff, 0x00, 0x00, 0xff,
 
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      0x00, 0xfa, 0x00, 0xfa
 
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    };
 
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  return cogl_texture_2d_new_from_data (context,
 
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                                        2, 1, /* width/height */
 
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                                        COGL_PIXEL_FORMAT_RGBA_8888_PRE,
 
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                                        4, /* rowstride */
 
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                                        data,
 
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                                        NULL /* error */);
 
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}
 
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void
 
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test_alpha_test (void)
 
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{
 
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  CoglTexture *tex = create_texture (test_ctx);
 
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  CoglPipeline *pipeline = cogl_pipeline_new (test_ctx);
 
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  int fb_width = cogl_framebuffer_get_width (test_fb);
 
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  int fb_height = cogl_framebuffer_get_height (test_fb);
 
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  CoglColor clear_color;
 
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  cogl_pipeline_set_layer_texture (pipeline, 0, tex);
 
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  cogl_pipeline_set_layer_filters (pipeline, 0,
 
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                                   COGL_PIPELINE_FILTER_NEAREST,
 
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                                   COGL_PIPELINE_FILTER_NEAREST);
 
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  cogl_pipeline_set_alpha_test_function (pipeline,
 
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                                         COGL_PIPELINE_ALPHA_FUNC_GEQUAL,
 
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                                         254 / 255.0f /* alpha reference */);
 
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  cogl_color_init_from_4ub (&clear_color, 0x00, 0x00, 0xff, 0xff);
 
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  cogl_framebuffer_clear (test_fb,
 
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                          COGL_BUFFER_BIT_COLOR,
 
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                          &clear_color);
 
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  cogl_framebuffer_draw_rectangle (test_fb,
 
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                                   pipeline,
 
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                                   -1, -1,
 
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                                   1, 1);
 
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  cogl_object_unref (pipeline);
 
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  cogl_object_unref (tex);
 
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  /* The left side of the framebuffer should use the first pixel from
 
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   * the texture which is red */
 
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  test_utils_check_region (test_fb,
 
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                           2, 2,
 
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                           fb_width / 2 - 4,
 
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                           fb_height - 4,
 
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                           0xff0000ff);
 
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  /* The right side of the framebuffer should use the clear color
 
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   * because the second pixel from the texture is clipped from the
 
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   * alpha test */
 
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  test_utils_check_region (test_fb,
 
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                           fb_width / 2 + 2,
 
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                           2,
 
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                           fb_width / 2 - 4,
 
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                           fb_height - 4,
 
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                           0x0000ffff);
 
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  if (cogl_test_verbose ())
 
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    g_print ("OK\n");
 
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}
 
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