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e913b4870a
From the spec (chapter 34, v1.3.283):
````
UNORM: the components are unsigned normalized values in the range [0, 1]
SRGB: the R, G and B components are unsigned normalized value that represent
values using sRGB nonlinear encoding, while the A component (if one
exists) is a regular unsigned normalized value
```
The difference is the storage encoding, the first one is aimed for image
transfers, while the second is for shaders, mostly in the swapchain stage in the
pipeline, and it's done automatically if needed [1].
As far as I have checked, other frameworks (FFmpeg, GTK+), when import or export
images from/to Vulkan, use exclusively UNORM formats, while SRGB formats are
ignored.
My conclusion is that Vulkan formats are related on how bits are stored in
memory rather their transfer functions (colorimetry).
This patch does two interrelated changes:
1. It swaps certain color format maps to try first, in both
gst_vulkan_format_from_video_info() and gst_vulkan_format_from_video_info_2(),
the UNORM formats, when comparing its usage, and later check for SRGB.
2. It removes the code that check for colorimetry in
gst_vulkan_format_from_video_info_2(), since it not storage related.
1. https://community.khronos.org/t/noob-difference-between-unorm-and-srgb/106132/7
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6797>
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* GStreamer
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*
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* Copyright (C) 2023 Igalia, S.L.
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/check/gstcheck.h>
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#include <gst/vulkan/vulkan.h>
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static GstVulkanInstance *instance;
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static GstVulkanDevice *device;
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static void
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setup (void)
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{
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instance = gst_vulkan_instance_new ();
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fail_unless (gst_vulkan_instance_open (instance, NULL));
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device = gst_vulkan_device_new_with_index (instance, 0);
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fail_unless (gst_vulkan_device_open (device, NULL));
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}
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static void
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teardown (void)
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{
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gst_object_unref (instance);
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gst_object_unref (device);
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}
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GST_START_TEST (test_format_from_video_info_2)
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{
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GstVulkanPhysicalDevice *phy_dev = device->physical_device;
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GstVideoInfo vinfo;
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VkFormat vk_fmts[GST_VIDEO_MAX_PLANES];
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int n_imgs;
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VkImageUsageFlags supported_usage;
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fail_unless (gst_video_info_set_format (&vinfo, GST_VIDEO_FORMAT_NV12, 620,
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480));
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fail_unless (gst_vulkan_format_from_video_info_2 (phy_dev, &vinfo,
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VK_IMAGE_TILING_OPTIMAL, TRUE, 0, vk_fmts, &n_imgs,
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&supported_usage));
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fail_unless (n_imgs == 2 && vk_fmts[0] == VK_FORMAT_R8_UNORM
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&& vk_fmts[1] == VK_FORMAT_R8G8_UNORM);
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fail_unless (gst_vulkan_format_from_video_info_2 (phy_dev, &vinfo,
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VK_IMAGE_TILING_LINEAR, FALSE, 0, vk_fmts, &n_imgs,
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&supported_usage));
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fail_unless (n_imgs == 1 && vk_fmts[0] == VK_FORMAT_G8_B8R8_2PLANE_420_UNORM);
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fail_unless (gst_video_info_set_format (&vinfo, GST_VIDEO_FORMAT_RGBA, 620,
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480));
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fail_unless (GST_VIDEO_INFO_COLORIMETRY (&vinfo).transfer ==
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GST_VIDEO_TRANSFER_SRGB);
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fail_unless (gst_vulkan_format_from_video_info_2 (phy_dev, &vinfo,
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VK_IMAGE_TILING_LINEAR, TRUE, 0, vk_fmts, &n_imgs, &supported_usage));
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fail_unless (n_imgs == 1 && vk_fmts[0] == VK_FORMAT_R8G8B8A8_UNORM);
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fail_unless (gst_video_info_set_format (&vinfo, GST_VIDEO_FORMAT_RGBA, 620,
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480));
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fail_unless (gst_video_colorimetry_from_string
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(&GST_VIDEO_INFO_COLORIMETRY (&vinfo), "smpte240m"));
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fail_unless (gst_vulkan_format_from_video_info_2 (phy_dev, &vinfo,
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VK_IMAGE_TILING_LINEAR, TRUE, 0, vk_fmts, &n_imgs, &supported_usage));
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fail_unless (n_imgs == 1 && vk_fmts[0] == VK_FORMAT_R8G8B8A8_UNORM);
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}
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GST_END_TEST;
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static Suite *
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vkformat_suite (void)
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{
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Suite *s = suite_create ("vkmemory");
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TCase *tc_basic = tcase_create ("general");
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gboolean have_instance;
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suite_add_tcase (s, tc_basic);
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tcase_add_checked_fixture (tc_basic, setup, teardown);
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/* FIXME: CI doesn't have a software vulkan renderer (and none exists currently) */
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instance = gst_vulkan_instance_new ();
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have_instance = gst_vulkan_instance_open (instance, NULL);
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gst_object_unref (instance);
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if (have_instance) {
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tcase_add_test (tc_basic, test_format_from_video_info_2);
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}
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return s;
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}
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GST_CHECK_MAIN (vkformat);
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