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render/vulkan: explain format mapping with DRM
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1 changed files with 7 additions and 1 deletions
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@ -5,8 +5,11 @@
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#include <xf86drm.h>
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#include "render/vulkan.h"
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// Reversed endianess of shm and vulkan format names
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static const struct wlr_vk_format formats[] = {
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// Vulkan non-packed 8-bits-per-channel formats have an inverted channel
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// order compared to the DRM formats, because DRM format channel order
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// is little-endian while Vulkan format channel order is in memory byte
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// order.
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{
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.drm = DRM_FORMAT_ARGB8888,
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.vk = VK_FORMAT_B8G8R8A8_SRGB,
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@ -27,6 +30,9 @@ static const struct wlr_vk_format formats[] = {
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.vk = VK_FORMAT_R8G8B8A8_SRGB,
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.is_srgb = true,
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},
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// Vulkan packed formats have the same channel order as DRM formats on
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// little endian systems.
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#if WLR_LITTLE_ENDIAN
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{
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.drm = DRM_FORMAT_RGB565,
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