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cogl/tests: Avoid converting 16bpc -> float -> 16bpc

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Instead just assign 16bpc -> 16bpc

This avoids variations in CPU and GL driver behaviour when using
floats as intermediate values.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3582
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3903>

(cherry picked from commit 5360c58fe5)
This commit is contained in:
Daniel van Vugt 2024-07-25 18:17:13 +08:00 committed by Robert Mader
parent c2c694464c
commit d6a4ffc843
1 changed files with 17 additions and 16 deletions
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33
src/tests/cogl/conform/test-offscreen-texture-formats.c
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@ -61,35 +61,36 @@ test_offscreen_texture_formats_store_rgba16161616 (void)
const uint16_t rgba16_green = 61133;
const uint16_t rgba16_blue = 2;
const uint16_t rgba16_alpha = 1111;
float red;
float green;
float blue;
float alpha;
int i;
red = (rgba16_red / (float) ((1 << 16) - 1));
green = (rgba16_green / (float) ((1 << 16) - 1));
blue = (rgba16_blue / (float) ((1 << 16) - 1));
alpha = (rgba16_alpha / (float) ((1 << 16) - 1));
uint16_t tex_data[16];
g_assert_cmpint (rgb8_to_rgb16 (rgb16_to_rgb8 (rgba16_red)), !=, rgba16_red);
g_assert_cmpint (rgb8_to_rgb16 (rgb16_to_rgb8 (rgba16_green)), !=, rgba16_green);
g_assert_cmpint (rgb8_to_rgb16 (rgb16_to_rgb8 (rgba16_blue)), !=, rgba16_blue);
g_assert_cmpint (rgb8_to_rgb16 (rgb16_to_rgb8 (rgba16_alpha)), !=, rgba16_alpha);
for (i = 0; i < 4; i++)
{
uint16_t *pixel_data = (uint16_t *) &tex_data [i * 4];
pixel_data[0] = rgba16_red;
pixel_data[1] = rgba16_green;
pixel_data[2] = rgba16_blue;
pixel_data[3] = rgba16_alpha;
}
/* Allocate 2x2 to ensure we avoid any fast paths. */
tex = cogl_texture_2d_new_with_format (test_ctx,
2, 2,
COGL_PIXEL_FORMAT_RGBA_16161616_PRE);
tex = cogl_texture_2d_new_from_data (test_ctx,
2, 2,
COGL_PIXEL_FORMAT_RGBA_16161616_PRE,
16,
(const uint8_t *) tex_data,
NULL);
offscreen = cogl_offscreen_new_with_texture (tex);
cogl_framebuffer_allocate (COGL_FRAMEBUFFER (offscreen), &error);
g_assert_no_error (error);
cogl_framebuffer_clear4f (COGL_FRAMEBUFFER (offscreen),
COGL_BUFFER_BIT_COLOR,
red, green, blue, alpha);
cogl_framebuffer_read_pixels (COGL_FRAMEBUFFER (offscreen), 0, 0, 2, 2,
COGL_PIXEL_FORMAT_RG_1616,
(uint8_t *) &readback);