mutter/cogl/tests/conform/test-alpha-test.c
2016-04-22 16:44:31 +02:00

74 lines
2.4 KiB
C

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