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render/vulkan: don't use UNDEFINED layout for imported DMA-BUFs

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UNDEFINED when used as source layout means that the contents of
the underlying memory becomes undefined. This isn't what we want
here: we don't want to mutate the imported pixel data.

The Vulkan spec isn't really clear what the proper value should be
here, but after discussing with driver developers [1] it seems like
UNDEFINED isn't the right one. The recommendation is to use GENERAL
instead.

[1]: https://github.com/ValveSoftware/gamescope/issues/356
This commit is contained in:
Simon Ser 2024-05-14 13:14:28 +02:00
parent 56ebfde540
commit 2c4d3ad12d
2 changed files with 2 additions and 4 deletions
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4
render/vulkan/pass.c
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@ -187,9 +187,7 @@ static bool render_pass_submit(struct wlr_render_pass *wlr_pass) {
size_t idx = 0;
uint32_t render_wait_len = 0;
wl_list_for_each_safe(texture, tmp_tex, &renderer->foreign_textures, foreign_link) {
VkImageLayout src_layout = VK_IMAGE_LAYOUT_GENERAL;
if (!texture->transitioned) {
src_layout = VK_IMAGE_LAYOUT_UNDEFINED;
texture->transitioned = true;
}
@ -199,7 +197,7 @@ static bool render_pass_submit(struct wlr_render_pass *wlr_pass) {
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_FOREIGN_EXT,
.dstQueueFamilyIndex = renderer->dev->queue_family,
.image = texture->image,
.oldLayout = src_layout,
.oldLayout = VK_IMAGE_LAYOUT_GENERAL,
.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
.srcAccessMask = 0, // ignored anyways
.dstAccessMask = VK_ACCESS_SHADER_READ_BIT,

2
render/vulkan/texture.c
View File

@ -842,7 +842,7 @@ void wlr_vk_texture_get_image_attribs(struct wlr_texture *texture,
attribs->image = vk_texture->image;
attribs->format = vk_texture->format->vk;
attribs->layout = vk_texture->transitioned ?
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL : VK_IMAGE_LAYOUT_UNDEFINED;
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL : VK_IMAGE_LAYOUT_GENERAL;
}
bool wlr_vk_texture_has_alpha(struct wlr_texture *texture) {