tests/cogl: Add test checking rgb10 fbo precision
There are two tests; one checks that clearing with a color that cannot be represented using 8 bits per channel doesn't loose precision when painted, then read back using glReadPixels(). Would the texture backing store have 8 bits per channel instead of 10, we'd get a different value back. The other test checks that painting from one fbo to another also doesn't loose that precision. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2461>
This commit is contained in:
Jonas Ådahl
Marge Bot
parent
86b7b5bc06
commit
ca98895185
@ -15,6 +15,7 @@ cogl_tests = [
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[ 'test-sub-texture', [] ],
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[ 'test-sub-texture', [] ],
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[ 'test-custom-attributes', [] ],
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[ 'test-custom-attributes', [] ],
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[ 'test-offscreen', [] ],
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[ 'test-offscreen', [] ],
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[ 'test-offscreen-texture-formats', [] ],
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[ 'test-journal', [] ],
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[ 'test-journal', [] ],
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[ 'test-primitive', [] ],
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[ 'test-primitive', [] ],
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[ 'test-sparse-pipeline', [] ],
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[ 'test-sparse-pipeline', [] ],
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237
src/tests/cogl/conform/test-offscreen-texture-formats.c
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237
src/tests/cogl/conform/test-offscreen-texture-formats.c
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@ -0,0 +1,237 @@
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/*
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* Copyright (C) 2022 Intel Corporation.
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* Copyright (C) 2022 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <cogl/cogl.h>
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#include "tests/cogl-test-utils.h"
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static int
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get_bits (uint32_t in,
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int end,
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int begin)
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{
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int mask = (1 << (end - begin + 1)) - 1;
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return (in >> begin) & mask;
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}
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static int
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rgb10_to_rgb8 (int rgb10)
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{
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float r;
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r = rgb10 / (float) (1 << 10);
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return (int) (r * (float) (1 << 8));
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}
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static int
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rgb8_to_rgb10 (int rgb8)
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{
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float r;
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r = rgb8 / (float) (1 << 8);
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return (int) (r * (float) (1 << 10));
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}
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static void
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test_offscreen_texture_formats_store_rgb10 (void)
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{
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const int rgb10_red = 514;
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const int rgb10_green = 258;
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const int rgb10_blue = 18;
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float red;
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float green;
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float blue;
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GError *error = NULL;
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CoglPixelFormat formats[] = {
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COGL_PIXEL_FORMAT_ABGR_2101010,
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COGL_PIXEL_FORMAT_ARGB_2101010,
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COGL_PIXEL_FORMAT_XRGB_2101010,
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COGL_PIXEL_FORMAT_RGBA_1010102,
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COGL_PIXEL_FORMAT_BGRA_1010102,
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COGL_PIXEL_FORMAT_XBGR_2101010,
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};
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int i;
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/* The extra fraction is there to avoid rounding inconsistencies in OpenGL
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* implementations. */
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red = (rgb10_red / (float) (1 << 10)) + 0.00001;
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green = (rgb10_green / (float) (1 << 10)) + 0.00001;
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blue = (rgb10_blue / (float) (1 << 10)) + 0.00001;
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/* Make sure that that the color value can't be represented using rgb8. */
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_red)), !=, rgb10_red);
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_green)), !=, rgb10_green);
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_blue)), !=, rgb10_blue);
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for (i = 0; i < G_N_ELEMENTS (formats); i++)
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{
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CoglTexture2D *tex;
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CoglOffscreen *offscreen;
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uint32_t rgb8_readback[4];
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uint8_t *rgb8_buf;
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int j;
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/* Allocate 2x2 to ensure we avoid any fast paths. */
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tex = cogl_texture_2d_new_with_format (test_ctx, 2, 2, formats[i]);
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offscreen = cogl_offscreen_new_with_texture (COGL_TEXTURE (tex));
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cogl_framebuffer_allocate (COGL_FRAMEBUFFER (offscreen), &error);
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g_assert_no_error (error);
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cogl_framebuffer_clear4f (COGL_FRAMEBUFFER (offscreen),
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COGL_BUFFER_BIT_COLOR,
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red, green, blue, 1.0);
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for (j = 0; j < G_N_ELEMENTS (formats); j++)
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{
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uint32_t rgb10_readback[4];
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int channels[3];
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int alpha;
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cogl_framebuffer_read_pixels (COGL_FRAMEBUFFER (offscreen), 0, 0, 2, 2,
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formats[j],
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(uint8_t *) &rgb10_readback);
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switch (formats[j])
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{
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case COGL_PIXEL_FORMAT_RGBA_1010102:
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case COGL_PIXEL_FORMAT_BGRA_1010102:
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channels[0] = get_bits (rgb10_readback[0], 31, 22);
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channels[1] = get_bits (rgb10_readback[0], 21, 12);
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channels[2] = get_bits (rgb10_readback[0], 11, 2);
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alpha = get_bits (rgb10_readback[0], 1, 0);
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break;
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case COGL_PIXEL_FORMAT_XRGB_2101010:
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case COGL_PIXEL_FORMAT_ARGB_2101010:
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case COGL_PIXEL_FORMAT_XBGR_2101010:
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case COGL_PIXEL_FORMAT_ABGR_2101010:
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alpha = get_bits (rgb10_readback[0], 31, 30);
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channels[0] = get_bits (rgb10_readback[0], 29, 20);
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channels[1] = get_bits (rgb10_readback[0], 19, 10);
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channels[2] = get_bits (rgb10_readback[0], 9, 0);
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break;
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default:
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g_assert_not_reached ();
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}
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g_assert_cmpint (alpha, ==, 0x3);
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switch (formats[j])
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{
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case COGL_PIXEL_FORMAT_RGBA_1010102:
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case COGL_PIXEL_FORMAT_XRGB_2101010:
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case COGL_PIXEL_FORMAT_ARGB_2101010:
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g_assert_cmpint (channels[0], ==, rgb10_red);
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g_assert_cmpint (channels[1], ==, rgb10_green);
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g_assert_cmpint (channels[2], ==, rgb10_blue);
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break;
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case COGL_PIXEL_FORMAT_BGRA_1010102:
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case COGL_PIXEL_FORMAT_XBGR_2101010:
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case COGL_PIXEL_FORMAT_ABGR_2101010:
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g_assert_cmpint (channels[0], ==, rgb10_blue);
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g_assert_cmpint (channels[1], ==, rgb10_green);
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g_assert_cmpint (channels[2], ==, rgb10_red);
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break;
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default:
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g_assert_not_reached ();
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}
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}
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cogl_framebuffer_read_pixels (COGL_FRAMEBUFFER (offscreen), 0, 0, 2, 2,
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COGL_PIXEL_FORMAT_RGBA_8888,
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(uint8_t *) &rgb8_readback);
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rgb8_buf = (uint8_t *) &rgb8_readback[0];
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g_assert_cmpint (rgb8_buf[0], ==, rgb10_to_rgb8 (rgb10_red));
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g_assert_cmpint (rgb8_buf[1], ==, rgb10_to_rgb8 (rgb10_green));
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g_assert_cmpint (rgb8_buf[2], ==, rgb10_to_rgb8 (rgb10_blue));
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g_assert_cmpint (rgb8_buf[3], ==, 0xff);
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g_object_unref (offscreen);
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cogl_object_unref (tex);
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}
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}
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static void
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test_offscreen_texture_formats_paint_rgb10 (void)
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{
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const int rgb10_red = 514;
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const int rgb10_green = 258;
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const int rgb10_blue = 18;
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float red;
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float green;
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float blue;
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CoglTexture2D *tex_src;
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CoglOffscreen *offscreen_src;
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CoglTexture2D *tex_dst;
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CoglOffscreen *offscreen_dst;
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CoglPipeline *pipeline;
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uint32_t rgb10_readback[4];
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GError *error = NULL;
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/* The extra fraction is there to avoid rounding inconsistencies in OpenGL
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* implementations. */
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red = (rgb10_red / (float) (1 << 10)) + 0.00001;
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green = (rgb10_green / (float) (1 << 10)) + 0.00001;
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blue = (rgb10_blue / (float) (1 << 10)) + 0.00001;
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/* Make sure that that the color value can't be represented using rgb8. */
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_red)), !=, rgb10_red);
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_green)), !=, rgb10_green);
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g_assert_cmpint (rgb8_to_rgb10 (rgb10_to_rgb8 (rgb10_blue)), !=, rgb10_blue);
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tex_src = cogl_texture_2d_new_with_format (test_ctx, 2, 2,
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COGL_PIXEL_FORMAT_RGBA_1010102);
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offscreen_src = cogl_offscreen_new_with_texture (COGL_TEXTURE (tex_src));
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cogl_framebuffer_allocate (COGL_FRAMEBUFFER (offscreen_src), &error);
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g_assert_no_error (error);
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tex_dst = cogl_texture_2d_new_with_format (test_ctx, 2, 2,
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COGL_PIXEL_FORMAT_ABGR_2101010);
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offscreen_dst = cogl_offscreen_new_with_texture (COGL_TEXTURE (tex_dst));
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cogl_framebuffer_allocate (COGL_FRAMEBUFFER (offscreen_dst), &error);
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g_assert_no_error (error);
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cogl_framebuffer_clear4f (COGL_FRAMEBUFFER (offscreen_src),
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COGL_BUFFER_BIT_COLOR,
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red, green, blue, 1.0);
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pipeline = cogl_pipeline_new (test_ctx);
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cogl_pipeline_set_layer_texture (pipeline, 0, tex_src);
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cogl_framebuffer_draw_rectangle (COGL_FRAMEBUFFER (offscreen_dst),
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pipeline,
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-1.0, -1.0, 1.0, 1.0);
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cogl_object_unref (pipeline);
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cogl_framebuffer_read_pixels (COGL_FRAMEBUFFER (offscreen_dst), 0, 0, 2, 2,
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COGL_PIXEL_FORMAT_ABGR_2101010,
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(uint8_t *) &rgb10_readback);
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g_assert_cmpint (get_bits (rgb10_readback[0], 31, 30), ==, 0x3);
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g_assert_cmpint (get_bits (rgb10_readback[0], 29, 20), ==, rgb10_blue);
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g_assert_cmpint (get_bits (rgb10_readback[0], 19, 10), ==, rgb10_green);
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g_assert_cmpint (get_bits (rgb10_readback[0], 9, 0), ==, rgb10_red);
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}
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COGL_TEST_SUITE (
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g_test_add_func ("/offscreen/texture-formats/store-rgb10",
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test_offscreen_texture_formats_store_rgb10);
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g_test_add_func ("/offscreen/texture-formats/paint-rgb10",
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test_offscreen_texture_formats_paint_rgb10);
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)
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