The open source OpenXR runtime
a/vk: On Android create sRGB images as linear and use views to sample with gamma
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src/xrt/auxiliary/vk/vk_helpers.c
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src/xrt/auxiliary/vk/vk_helpers.c
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// This is the format we allocate the image in, can be changed further down.
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VkFormat image_format = (VkFormat)info->format;
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#ifdef XRT_GRAPHICS_BUFFER_HANDLE_IS_AHARDWAREBUFFER
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/*
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* Some Vulkan drivers will natively support importing and exporting
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* SRGB formats (Qualcomm) even tho technically that's not intended
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* by the AHardwareBuffer since they don't support sRGB formats.
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* While others (Mail) does not support importing and exporting sRGB
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* formats. So we need to create the image without sRGB and then create
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* the image views with sRGB which is allowed by the Vulkan spec. It
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* seems to be safe to do with on all drivers, so to reduce the logic
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* do that instead.
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*/
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if (image_format == VK_FORMAT_R8G8B8A8_SRGB) {
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image_format = VK_FORMAT_R8G8B8A8_UNORM;
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}
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#endif
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VkImageUsageFlags image_usage = vk_csci_get_image_usage_flags( //
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vk, //
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image_format, //