Implement scaled vertex buffer format emulation

These formats are unsupported by mobile GPUs so they need to be emulated in shaders instead.

2 files changed, 13 insertions, 2 deletions

diff --git a/src/video_core/renderer_vulkan/maxwell_to_vk.cpp b/src/video_core/renderer_vulkan/maxwell_to_vk.cpp
index b75d7220d..9a0b10568 100644
--- a/src/video_core/renderer_vulkan/maxwell_to_vk.cpp
+++ b/src/video_core/renderer_vulkan/maxwell_to_vk.cpp
@@ -347,6 +347,14 @@ VkPrimitiveTopology PrimitiveTopology([[maybe_unused]] const Device& device,
 
 VkFormat VertexFormat(const Device& device, Maxwell::VertexAttribute::Type type,
                       Maxwell::VertexAttribute::Size size) {
+    if (device.MustEmulateScaledFormats()) {
+        if (type == Maxwell::VertexAttribute::Type::SScaled) {
+            type = Maxwell::VertexAttribute::Type::SInt;
+        } else if (type == Maxwell::VertexAttribute::Type::UScaled) {
+            type = Maxwell::VertexAttribute::Type::UInt;
+        }
+    }
+
     const VkFormat format{([&]() {
         switch (type) {
         case Maxwell::VertexAttribute::Type::UnusedEnumDoNotUseBecauseItWillGoAway:
diff --git a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
index ec55e11b1..e39713761 100644
--- a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
@@ -114,14 +114,16 @@ Shader::AttributeType CastAttributeType(const FixedPipelineState::VertexAttribut
         return Shader::AttributeType::Disabled;
     case Maxwell::VertexAttribute::Type::SNorm:
     case Maxwell::VertexAttribute::Type::UNorm:
-    case Maxwell::VertexAttribute::Type::UScaled:
-    case Maxwell::VertexAttribute::Type::SScaled:
     case Maxwell::VertexAttribute::Type::Float:
         return Shader::AttributeType::Float;
     case Maxwell::VertexAttribute::Type::SInt:
         return Shader::AttributeType::SignedInt;
     case Maxwell::VertexAttribute::Type::UInt:
         return Shader::AttributeType::UnsignedInt;
+    case Maxwell::VertexAttribute::Type::UScaled:
+        return Shader::AttributeType::UnsignedScaled;
+    case Maxwell::VertexAttribute::Type::SScaled:
+        return Shader::AttributeType::SignedScaled;
     }
     return Shader::AttributeType::Float;
 }
@@ -331,6 +333,7 @@ PipelineCache::PipelineCache(RasterizerVulkan& rasterizer_, const Device& device
         .support_derivative_control = true,
         .support_geometry_shader_passthrough = device.IsNvGeometryShaderPassthroughSupported(),
         .support_native_ndc = device.IsExtDepthClipControlSupported(),
+        .support_scaled_attributes = !device.MustEmulateScaledFormats(),
 
         .warp_size_potentially_larger_than_guest = device.IsWarpSizePotentiallyBiggerThanGuest(),