From 56a6012a7c1d7f22f262abca337e6d181e681a4b Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Sat, 21 Feb 2026 14:10:59 +0100
Subject: [PATCH] vulkan: implement all alpha modes

---
 src/gfx_apis/vulkan.rs                        |   5 +++++
 src/gfx_apis/vulkan/alpha_modes.rs            |  15 +++++++++++++++
 src/gfx_apis/vulkan/pipeline.rs               |  15 ++++++++++-----
 src/gfx_apis/vulkan/renderer.rs               |  16 ++++++++++++++--
 src/gfx_apis/vulkan/shaders/alpha_modes.glsl  |   8 ++++++++
 .../vulkan/shaders/frag_spec_const.glsl       |   1 +
 src/gfx_apis/vulkan/shaders/tex.frag          |   8 ++++++--
 .../vulkan/shaders_bin/legacy_fill.frag.spv   | Bin 964 -> 1016 bytes
 .../vulkan/shaders_bin/legacy_tex.frag.spv    | Bin 1800 -> 1852 bytes
 src/gfx_apis/vulkan/shaders_bin/out.frag.spv  | Bin 13824 -> 13876 bytes
 src/gfx_apis/vulkan/shaders_bin/tex.frag.spv  | Bin 14596 -> 15032 bytes
 src/gfx_apis/vulkan/shaders_hash.txt          |   5 +++--
 12 files changed, 62 insertions(+), 11 deletions(-)
 create mode 100644 src/gfx_apis/vulkan/alpha_modes.rs
 create mode 100644 src/gfx_apis/vulkan/shaders/alpha_modes.glsl

diff --git a/src/gfx_apis/vulkan.rs b/src/gfx_apis/vulkan.rs
index ad0a5943..36662e47 100644
--- a/src/gfx_apis/vulkan.rs
+++ b/src/gfx_apis/vulkan.rs
@@ -1,4 +1,5 @@
 mod allocator;
+mod alpha_modes;
 mod blend_buffer;
 mod bo_allocator;
 mod buffer_cache;
@@ -387,6 +388,10 @@ impl GfxContext for Context {
         self.0.device.descriptor_buffer.is_some()
     }
 
+    fn supports_alpha_modes(&self) -> bool {
+        self.0.device.descriptor_buffer.is_some()
+    }
+
     fn create_dmabuf_buffer(
         &self,
         dmabuf: &OwnedFd,
diff --git a/src/gfx_apis/vulkan/alpha_modes.rs b/src/gfx_apis/vulkan/alpha_modes.rs
new file mode 100644
index 00000000..9480c2b0
--- /dev/null
+++ b/src/gfx_apis/vulkan/alpha_modes.rs
@@ -0,0 +1,15 @@
+use crate::gfx_api::AlphaMode;
+
+pub const AM_PREMULTIPLIED_ELECTRICAL: u32 = 0;
+pub const AM_PREMULTIPLIED_OPTICAL: u32 = 1;
+pub const AM_STRAIGHT: u32 = 2;
+
+impl AlphaMode {
+    pub fn to_vulkan(self) -> u32 {
+        match self {
+            AlphaMode::PremultipliedElectrical => AM_PREMULTIPLIED_ELECTRICAL,
+            AlphaMode::PremultipliedOptical => AM_PREMULTIPLIED_OPTICAL,
+            AlphaMode::Straight => AM_STRAIGHT,
+        }
+    }
+}
diff --git a/src/gfx_apis/vulkan/pipeline.rs b/src/gfx_apis/vulkan/pipeline.rs
index 3e446eb2..5351a483 100644
--- a/src/gfx_apis/vulkan/pipeline.rs
+++ b/src/gfx_apis/vulkan/pipeline.rs
@@ -1,7 +1,10 @@
 use {
-    crate::gfx_apis::vulkan::{
-        VulkanError, descriptor::VulkanDescriptorSetLayout, device::VulkanDevice,
-        shaders::VulkanShader,
+    crate::{
+        gfx_api::AlphaMode,
+        gfx_apis::vulkan::{
+            VulkanError, descriptor::VulkanDescriptorSetLayout, device::VulkanDevice,
+            shaders::VulkanShader,
+        },
     },
     arrayvec::ArrayVec,
     ash::{
@@ -37,6 +40,7 @@ pub(super) struct PipelineCreateInfo {
     pub(super) blend: bool,
     pub(super) src_has_alpha: bool,
     pub(super) has_alpha_mult: bool,
+    pub(super) alpha_mode: AlphaMode,
     pub(super) eotf: u32,
     pub(super) inv_eotf: u32,
     pub(super) descriptor_set_layouts: ArrayVec<Rc<VulkanDescriptorSetLayout>, 2>,
@@ -76,8 +80,8 @@ impl VulkanDevice {
         };
         let destroy_layout =
             on_drop(|| unsafe { self.device.destroy_pipeline_layout(pipeline_layout, None) });
-        let mut frag_spec_data = ArrayVec::<_, { 5 * 4 }>::new();
-        let mut frag_spec_entries = ArrayVec::<_, 5>::new();
+        let mut frag_spec_data = ArrayVec::<_, { 6 * 4 }>::new();
+        let mut frag_spec_entries = ArrayVec::<_, 6>::new();
         let mut frag_spec_entry = |data: &[u8]| {
             let entry = SpecializationMapEntry::default()
                 .constant_id(frag_spec_entries.len() as _)
@@ -91,6 +95,7 @@ impl VulkanDevice {
         frag_spec_entry(&info.eotf.to_ne_bytes());
         frag_spec_entry(&info.inv_eotf.to_ne_bytes());
         frag_spec_entry(&(info.has_color_management_data as u32).to_ne_bytes());
+        frag_spec_entry(&info.alpha_mode.to_vulkan().to_ne_bytes());
         let frag_spec = SpecializationInfo::default()
             .map_entries(&frag_spec_entries)
             .data(&frag_spec_data);
diff --git a/src/gfx_apis/vulkan/renderer.rs b/src/gfx_apis/vulkan/renderer.rs
index 29a983a2..44d11c2c 100644
--- a/src/gfx_apis/vulkan/renderer.rs
+++ b/src/gfx_apis/vulkan/renderer.rs
@@ -8,8 +8,8 @@ use {
         },
         cpu_worker::PendingJob,
         gfx_api::{
-            AcquireSync, BufferResv, BufferResvUser, GfxApiOpt, GfxBlendBuffer, GfxFormat,
-            GfxTexture, GfxWriteModifier, ReleaseSync, SyncFile,
+            AcquireSync, AlphaMode, BufferResv, BufferResvUser, GfxApiOpt, GfxBlendBuffer,
+            GfxFormat, GfxTexture, GfxWriteModifier, ReleaseSync, SyncFile,
         },
         gfx_apis::vulkan::{
             VulkanError,
@@ -209,6 +209,7 @@ struct VulkanTexOp {
     alpha: f32,
     source_type: TexSourceType,
     copy_type: TexCopyType,
+    alpha_mode: AlphaMode,
     range_address: DeviceAddress,
     instances: u32,
     tex_cd: Rc<ColorDescription>,
@@ -258,6 +259,7 @@ type FillPipelines = Rc<StaticMap<TexSourceType, Rc<VulkanPipeline>>>;
 struct TexPipelineKey {
     tex_copy_type: TexCopyType,
     tex_source_type: TexSourceType,
+    tex_alpha_mode: AlphaMode,
     eotf: VulkanEotf,
     has_color_management_data: bool,
 }
@@ -431,6 +433,7 @@ impl VulkanRenderer {
                 blend: src_has_alpha,
                 src_has_alpha,
                 has_alpha_mult: false,
+                alpha_mode: AlphaMode::PremultipliedOptical,
                 // all transformations are applied in the compositor
                 eotf: EOTF_LINEAR,
                 inv_eotf: EOTF_LINEAR,
@@ -474,11 +477,16 @@ impl VulkanRenderer {
         tex_cd: &ColorDescription,
         tex_copy_type: TexCopyType,
         tex_source_type: TexSourceType,
+        mut tex_alpha_mode: AlphaMode,
         has_color_management_data: bool,
     ) -> Result<Rc<VulkanPipeline>, VulkanError> {
+        if tex_source_type == TexSourceType::Opaque {
+            tex_alpha_mode = AlphaMode::PremultipliedElectrical;
+        }
         let key = TexPipelineKey {
             tex_copy_type,
             tex_source_type,
+            tex_alpha_mode,
             eotf: tex_cd.eotf.to_vulkan(),
             has_color_management_data,
         };
@@ -505,6 +513,7 @@ impl VulkanRenderer {
             blend: src_has_alpha || has_alpha_mult,
             src_has_alpha,
             has_alpha_mult,
+            alpha_mode: key.tex_alpha_mode,
             eotf: key.eotf.to_vulkan(),
             inv_eotf: pipelines.eotf.to_vulkan(),
             descriptor_set_layouts: self.tex_descriptor_set_layouts.clone(),
@@ -543,6 +552,7 @@ impl VulkanRenderer {
                 blend: false,
                 src_has_alpha: true,
                 has_alpha_mult: false,
+                alpha_mode: AlphaMode::PremultipliedElectrical,
                 eotf: key.eotf.to_vulkan(),
                 inv_eotf: fb_eotf.to_vulkan(),
                 descriptor_set_layouts,
@@ -886,6 +896,7 @@ impl VulkanRenderer {
                             alpha: ct.alpha.unwrap_or_default(),
                             source_type,
                             copy_type,
+                            alpha_mode: ct.alpha_mode,
                             range_address: 0,
                             instances: 0,
                             tex_cd: ct.cd.clone(),
@@ -1333,6 +1344,7 @@ impl VulkanRenderer {
                         &c.tex_cd,
                         c.copy_type,
                         c.source_type,
+                        c.alpha_mode,
                         c.color_management_data_address.is_some(),
                     )?;
                     bind(&pipeline);
diff --git a/src/gfx_apis/vulkan/shaders/alpha_modes.glsl b/src/gfx_apis/vulkan/shaders/alpha_modes.glsl
new file mode 100644
index 00000000..1bb87a3e
--- /dev/null
+++ b/src/gfx_apis/vulkan/shaders/alpha_modes.glsl
@@ -0,0 +1,8 @@
+#ifndef ALPHA_MODES_GLSL
+#define ALPHA_MODES_GLSL
+
+#define AM_PREMULTIPLIED_ELECTRICAL 0
+#define AM_PREMULTIPLIED_OPTICAL 1
+#define AM_STRAIGHT 2
+
+#endif
diff --git a/src/gfx_apis/vulkan/shaders/frag_spec_const.glsl b/src/gfx_apis/vulkan/shaders/frag_spec_const.glsl
index cf7f8a7c..29e3b2ef 100644
--- a/src/gfx_apis/vulkan/shaders/frag_spec_const.glsl
+++ b/src/gfx_apis/vulkan/shaders/frag_spec_const.glsl
@@ -6,5 +6,6 @@ layout(constant_id = 1) const bool has_alpha_multiplier = false;
 layout(constant_id = 2) const uint eotf = 0;
 layout(constant_id = 3) const uint inv_eotf = 0;
 layout(constant_id = 4) const bool has_matrix = false;
+layout(constant_id = 5) const uint alpha_mode = 0;
 
 #endif
diff --git a/src/gfx_apis/vulkan/shaders/tex.frag b/src/gfx_apis/vulkan/shaders/tex.frag
index df6ee5ec..e1ccacda 100644
--- a/src/gfx_apis/vulkan/shaders/tex.frag
+++ b/src/gfx_apis/vulkan/shaders/tex.frag
@@ -8,6 +8,7 @@
 #include "tex.common.glsl"
 #include "tex_set.glsl"
 #include "eotfs.glsl"
+#include "alpha_modes.glsl"
 
 layout(set = 0, binding = 0) uniform sampler sam;
 layout(location = 0) in vec2 tex_pos;
@@ -15,12 +16,15 @@ layout(location = 0) out vec4 out_color;
 
 void main() {
 	vec4 c = textureLod(sampler2D(tex, sam), tex_pos, 0);
-	if (eotf != inv_eotf || has_matrix) {
+	if (eotf != inv_eotf || has_matrix || alpha_mode != AM_PREMULTIPLIED_ELECTRICAL) {
 		vec3 rgb = c.rgb;
-		if (src_has_alpha) {
+		if (src_has_alpha && alpha_mode == AM_PREMULTIPLIED_ELECTRICAL) {
 			rgb /= mix(c.a, 1.0, c.a == 0.0);
 		}
 		rgb = apply_eotf(rgb);
+		if (src_has_alpha && alpha_mode == AM_PREMULTIPLIED_OPTICAL) {
+			rgb /= mix(c.a, 1.0, c.a == 0.0);
+		}
 		if (has_matrix) {
 			rgb = (cm_data.matrix * vec4(rgb, 1.0)).rgb;
 		}
diff --git a/src/gfx_apis/vulkan/shaders_bin/legacy_fill.frag.spv b/src/gfx_apis/vulkan/shaders_bin/legacy_fill.frag.spv
index 961877a707b4260e86b4b1b16952ea5f26bbee82..b1377f0a9e52111fdeb7bb355adeacd7c54a8d4c 100644
GIT binary patch
delta 82
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delta 35
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diff --git a/src/gfx_apis/vulkan/shaders_bin/legacy_tex.frag.spv b/src/gfx_apis/vulkan/shaders_bin/legacy_tex.frag.spv
index 1c2f806fe51e1ec312cfd5c9dec4662ec5d4ec97..9664f0444b53972c0abb7953a50d28a075bb07be 100644
GIT binary patch
delta 83
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delta 36
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diff --git a/src/gfx_apis/vulkan/shaders_bin/out.frag.spv b/src/gfx_apis/vulkan/shaders_bin/out.frag.spv
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GIT binary patch
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diff --git a/src/gfx_apis/vulkan/shaders_hash.txt b/src/gfx_apis/vulkan/shaders_hash.txt
index 9d144084..ab855a2d 100644
--- a/src/gfx_apis/vulkan/shaders_hash.txt
+++ b/src/gfx_apis/vulkan/shaders_hash.txt
@@ -1,8 +1,9 @@
+302a9f250bdc4f8e0e71a9f77c9a8a7aa55fd003bc91c2422a700c4abd83f54e src/gfx_apis/vulkan/shaders/alpha_modes.glsl
 b6a0df1e231fab533499329636b7a580384784418baee06c147af5fcc384cf5c src/gfx_apis/vulkan/shaders/eotfs.glsl
 8a38df18851cd13884499820f26939fb7319f45d913d867f254d8118d59fb117 src/gfx_apis/vulkan/shaders/fill.common.glsl
 21c488d12aa5ad2f109ec44cb856dfe837e02ea9025b5ed64439d742c17cbf30 src/gfx_apis/vulkan/shaders/fill.frag
 4fb481d8d73afdfb0d8f077eb8665d86f06c8a32a91e44ed369ef5dff554646d src/gfx_apis/vulkan/shaders/fill.vert
-63af15c4e00587a7bb8494934c88d9874712a511217829b50f3c08fa3c461082 src/gfx_apis/vulkan/shaders/frag_spec_const.glsl
+f93524fd077bc9984702b1e0f92232f80bfe28a0a92439dc164c1ea41fd16d64 src/gfx_apis/vulkan/shaders/frag_spec_const.glsl
 c315a064b48dd5bdb607a6b79c30d31b6e59ffec69e93d50ab875abf97c41bbf src/gfx_apis/vulkan/shaders/legacy/fill.common.glsl
 590d061b97446fc501158609eaf098b71bc7b328c008b586ff36613ce690d618 src/gfx_apis/vulkan/shaders/legacy/fill.frag
 ad22a79e1a88a12daa40c0a2b953084c129a408297c8ca544d60e0b6001470b9 src/gfx_apis/vulkan/shaders/legacy/fill.vert
@@ -13,6 +14,6 @@ e0a8769dd7938dd02e66db9e9048ed6bef8f8c42671f2e2c7a7976a6d498f685 src/gfx_apis/vu
 5069f619c7d722815a022e2d84720a2d8290af49a3ed49ea0cd26b52115cc39a src/gfx_apis/vulkan/shaders/out.frag
 0adc7e12328c15fb3e7e6c8b8701a182223c2f15337e14131f41dd247e697809 src/gfx_apis/vulkan/shaders/out.vert
 e22d4d3318a350def8ef19c7b27dc6a308a84c2fe9d7c02b81107f72073cd481 src/gfx_apis/vulkan/shaders/tex.common.glsl
-06993d4d882fe5c651e5ab54f0116b9622352a97f3575985076ef464b472dd39 src/gfx_apis/vulkan/shaders/tex.frag
+1f196cee646a934072beb3e5648a5042c035953d9a0c26b0a22e330c2f8bb994 src/gfx_apis/vulkan/shaders/tex.frag
 423cf327c9fcc4070dbf75321c1224a1589b6cf3d2f1ea5e8bd0362e1a9f3aa1 src/gfx_apis/vulkan/shaders/tex.vert
 b982f7101c22931a33b32dce3408387f3392c0f0ad0ca5852da265b0d12856bb src/gfx_apis/vulkan/shaders/tex_set.glsl