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cogl/tests: Do not blend for texture format paint tests

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The default cogl blend string is
`RGBA = ADD (SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))` which is alpha
blending with premult fragment results. We do not clear the src
framebuffer and even if we did set alpha to 1 in the src fb, the
resulting alpha would be 1 and we want to check the alpha of the
fragment color.

Just turn off any kind of blending instead and write out the fragment
color to the fb.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3065>
This commit is contained in:
Sebastian Wick 2023-07-12 18:34:07 +02:00 committed by Marge Bot
parent d79e4c182e
commit ae5512bc05
1 changed files with 4 additions and 0 deletions
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4
src/tests/cogl/conform/test-offscreen-texture-formats.c
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@ -344,6 +344,8 @@ test_offscreen_texture_formats_paint_rgb10 (void)
red, green, blue, alpha);
pipeline = cogl_pipeline_new (test_ctx);
cogl_pipeline_set_blend (pipeline,
"RGBA = ADD (SRC_COLOR, 0)", NULL);
cogl_pipeline_set_layer_texture (pipeline, 0, tex_src);
cogl_framebuffer_draw_rectangle (COGL_FRAMEBUFFER (offscreen_dst),
pipeline,
@ -468,6 +470,8 @@ test_offscreen_texture_formats_paint_rgb8 (void)
&color);
pipeline = cogl_pipeline_new (test_ctx);
cogl_pipeline_set_blend (pipeline,
"RGBA = ADD (SRC_COLOR, 0)", NULL);
cogl_pipeline_set_layer_texture (pipeline, 0, tex_src);
cogl_framebuffer_draw_rectangle (COGL_FRAMEBUFFER (offscreen_dst),
pipeline,