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render/vulkan: explain format mapping with DRM

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This commit is contained in:
Simon Ser 2022-11-29 09:47:08 +01:00
parent 8b9a48c984
commit ad165f7daf
1 changed files with 7 additions and 1 deletions
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8
render/vulkan/pixel_format.c
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@ -5,8 +5,11 @@
#include <xf86drm.h> #include <xf86drm.h>
#include "render/vulkan.h" #include "render/vulkan.h"
// Reversed endianess of shm and vulkan format names
static const struct wlr_vk_format formats[] = { static const struct wlr_vk_format formats[] = {
// Vulkan non-packed 8-bits-per-channel formats have an inverted channel
// order compared to the DRM formats, because DRM format channel order
// is little-endian while Vulkan format channel order is in memory byte
// order.
{ {
.drm = DRM_FORMAT_ARGB8888, .drm = DRM_FORMAT_ARGB8888,
.vk = VK_FORMAT_B8G8R8A8_SRGB, .vk = VK_FORMAT_B8G8R8A8_SRGB,
@ -27,6 +30,9 @@ static const struct wlr_vk_format formats[] = {
.vk = VK_FORMAT_R8G8B8A8_SRGB, .vk = VK_FORMAT_R8G8B8A8_SRGB,
.is_srgb = true, .is_srgb = true,
}, },
// Vulkan packed formats have the same channel order as DRM formats on
// little endian systems.
#if WLR_LITTLE_ENDIAN #if WLR_LITTLE_ENDIAN
{ {
.drm = DRM_FORMAT_RGB565, .drm = DRM_FORMAT_RGB565,