73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
#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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