diff options
| author | Simon Ser <contact@emersion.fr> | 2022-11-29 09:47:08 +0100 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2022-12-02 10:24:00 +0100 |
| commit | ad165f7daf94dec5e7c91984bfffe122a1d2b8d7 (patch) | |
| tree | e92304565d853d90a7e7ce617fab68be8590a36e /render/vulkan | |
| parent | 8b9a48c9848644c008fe1f9e5902fe4246b322f1 (diff) | |
render/vulkan: explain format mapping with DRM
Diffstat (limited to 'render/vulkan')
| -rw-r--r-- | render/vulkan/pixel_format.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/render/vulkan/pixel_format.c b/render/vulkan/pixel_format.c index 30a44b91..911cd217 100644 --- a/render/vulkan/pixel_format.c +++ b/render/vulkan/pixel_format.c @@ -5,8 +5,11 @@ #include <xf86drm.h> #include "render/vulkan.h" -// Reversed endianess of shm and vulkan format names 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, .vk = VK_FORMAT_B8G8R8A8_SRGB, @@ -27,6 +30,9 @@ static const struct wlr_vk_format formats[] = { .vk = VK_FORMAT_R8G8B8A8_SRGB, .is_srgb = true, }, + + // Vulkan packed formats have the same channel order as DRM formats on + // little endian systems. #if WLR_LITTLE_ENDIAN { .drm = DRM_FORMAT_RGB565, |