vulkan: Fix rescaling push constant usage

4 files changed, 36 insertions, 34 deletions

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 8646fe989..723455462 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -1006,47 +1006,47 @@ void EmitContext::DefineRescalingInput(const Info& info) {
         return;
     }
     if (profile.unified_descriptor_binding) {
-        DefineRescalingInputPushConstant(info);
+        DefineRescalingInputPushConstant();
     } else {
         DefineRescalingInputUniformConstant();
     }
 }
 
-void EmitContext::DefineRescalingInputPushConstant(const Info& info) {
-    boost::container::static_vector<Id, 3> members{F32[1]};
+void EmitContext::DefineRescalingInputPushConstant() {
+    boost::container::static_vector<Id, 3> members{};
     u32 member_index{0};
-    if (!info.texture_descriptors.empty()) {
-        rescaling_textures_type = TypeArray(U32[1], Const(4u));
-        Decorate(rescaling_textures_type, spv::Decoration::ArrayStride, 4u);
-        members.push_back(rescaling_textures_type);
-        rescaling_textures_member_index = ++member_index;
-    }
-    if (!info.image_descriptors.empty()) {
-        rescaling_images_type = TypeArray(U32[1], Const(NUM_IMAGE_SCALING_WORDS));
-        if (rescaling_textures_type.value != rescaling_images_type.value) {
-            Decorate(rescaling_images_type, spv::Decoration::ArrayStride, 4u);
-        }
-        members.push_back(rescaling_images_type);
-        rescaling_images_member_index = ++member_index;
+
+    rescaling_textures_type = TypeArray(U32[1], Const(4u));
+    Decorate(rescaling_textures_type, spv::Decoration::ArrayStride, 4u);
+    members.push_back(rescaling_textures_type);
+    rescaling_textures_member_index = member_index++;
+
+    rescaling_images_type = TypeArray(U32[1], Const(NUM_IMAGE_SCALING_WORDS));
+    Decorate(rescaling_images_type, spv::Decoration::ArrayStride, 4u);
+    members.push_back(rescaling_images_type);
+    rescaling_images_member_index = member_index++;
+
+    if (stage != Stage::Compute) {
+        members.push_back(F32[1]);
+        rescaling_downfactor_member_index = member_index++;
     }
     const Id push_constant_struct{TypeStruct(std::span(members.data(), members.size()))};
     Decorate(push_constant_struct, spv::Decoration::Block);
     Name(push_constant_struct, "ResolutionInfo");
 
-    MemberDecorate(push_constant_struct, 0u, spv::Decoration::Offset, 0u);
-    MemberName(push_constant_struct, 0u, "down_factor");
+    MemberDecorate(push_constant_struct, rescaling_textures_member_index, spv::Decoration::Offset,
+                   static_cast<u32>(offsetof(RescalingLayout, rescaling_textures)));
+    MemberName(push_constant_struct, rescaling_textures_member_index, "rescaling_textures");
 
-    const u32 offset_bias = stage == Stage::Compute ? sizeof(u32) : 0;
-    if (!info.texture_descriptors.empty()) {
-        MemberDecorate(
-            push_constant_struct, rescaling_textures_member_index, spv::Decoration::Offset,
-            static_cast<u32>(offsetof(RescalingLayout, rescaling_textures) - offset_bias));
-        MemberName(push_constant_struct, rescaling_textures_member_index, "rescaling_textures");
-    }
-    if (!info.image_descriptors.empty()) {
-        MemberDecorate(push_constant_struct, rescaling_images_member_index, spv::Decoration::Offset,
-                       static_cast<u32>(offsetof(RescalingLayout, rescaling_images) - offset_bias));
-        MemberName(push_constant_struct, rescaling_images_member_index, "rescaling_images");
+    MemberDecorate(push_constant_struct, rescaling_images_member_index, spv::Decoration::Offset,
+                   static_cast<u32>(offsetof(RescalingLayout, rescaling_images)));
+    MemberName(push_constant_struct, rescaling_images_member_index, "rescaling_images");
+
+    if (stage != Stage::Compute) {
+        MemberDecorate(push_constant_struct, rescaling_downfactor_member_index,
+                       spv::Decoration::Offset,
+                       static_cast<u32>(offsetof(RescalingLayout, down_factor)));
+        MemberName(push_constant_struct, rescaling_downfactor_member_index, "down_factor");
     }
     const Id pointer_type{TypePointer(spv::StorageClass::PushConstant, push_constant_struct)};
     rescaling_push_constants = AddGlobalVariable(pointer_type, spv::StorageClass::PushConstant);
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index b67704baa..63f8185d9 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -244,6 +244,7 @@ public:
     Id rescaling_images_type{};
     u32 rescaling_textures_member_index{};
     u32 rescaling_images_member_index{};
+    u32 rescaling_downfactor_member_index{};
     u32 texture_rescaling_index{};
     u32 image_rescaling_index{};
 
@@ -324,7 +325,7 @@ private:
     void DefineAttributeMemAccess(const Info& info);
     void DefineGlobalMemoryFunctions(const Info& info);
     void DefineRescalingInput(const Info& info);
-    void DefineRescalingInputPushConstant(const Info& info);
+    void DefineRescalingInputPushConstant();
     void DefineRescalingInputUniformConstant();
 
     void DefineInputs(const IR::Program& program);
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv.h b/src/shader_recompiler/backend/spirv/emit_spirv.h
index cf59f2572..4b25534ce 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv.h
+++ b/src/shader_recompiler/backend/spirv/emit_spirv.h
@@ -22,11 +22,12 @@ constexpr u32 NUM_TEXTURE_AND_IMAGE_SCALING_WORDS =
     NUM_TEXTURE_SCALING_WORDS + NUM_IMAGE_SCALING_WORDS;
 
 struct RescalingLayout {
-    u32 down_factor;
     alignas(16) std::array<u32, NUM_TEXTURE_SCALING_WORDS> rescaling_textures;
     alignas(16) std::array<u32, NUM_IMAGE_SCALING_WORDS> rescaling_images;
+    alignas(16) u32 down_factor;
 };
-constexpr u32 RESCALING_PUSH_CONSTANT_WORDS_OFFSET = offsetof(RescalingLayout, rescaling_textures);
+constexpr u32 RESCALING_LAYOUT_WORDS_OFFSET = offsetof(RescalingLayout, rescaling_textures);
+constexpr u32 RESCALING_LAYOUT_DOWN_FACTOR_OFFSET = offsetof(RescalingLayout, down_factor);
 
 [[nodiscard]] std::vector<u32> EmitSPIRV(const Profile& profile, const RuntimeInfo& runtime_info,
                                          IR::Program& program, Bindings& bindings);
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index c0db7452f..bac683ae1 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -529,8 +529,8 @@ Id EmitYDirection(EmitContext& ctx) {
 Id EmitResolutionDownFactor(EmitContext& ctx) {
     if (ctx.profile.unified_descriptor_binding) {
         const Id pointer_type{ctx.TypePointer(spv::StorageClass::PushConstant, ctx.F32[1])};
-        const Id pointer{
-            ctx.OpAccessChain(pointer_type, ctx.rescaling_push_constants, ctx.u32_zero_value)};
+        const Id index{ctx.Const(ctx.rescaling_downfactor_member_index)};
+        const Id pointer{ctx.OpAccessChain(pointer_type, ctx.rescaling_push_constants, index)};
         return ctx.OpLoad(ctx.F32[1], pointer);
     } else {
         const Id composite{ctx.OpLoad(ctx.F32[4], ctx.rescaling_uniform_constant)};