From 91dddca26eca0c2e00bb2974099908bf26d34f43 Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Wed, 13 May 2020 04:32:41 -0300 Subject: vk_rasterizer: Implement constant attributes Constant attributes (in OpenGL known disabled attributes) are not supported on Vulkan, even with extensions. To emulate this behavior we return zero on reads from disabled vertex attributes in shader code. This has no caching cost because attribute formats are not dynamic state on Vulkan and we have to store it in the pipeline cache anyway. - Fixes Animal Crossing: New Horizons terrain borders --- .../renderer_vulkan/vk_shader_decompiler.cpp | 30 ++++++++++++++-------- 1 file changed, 20 insertions(+), 10 deletions(-) (limited to 'src/video_core/renderer_vulkan/vk_shader_decompiler.cpp') diff --git a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp index 18678968c..6ce6bfcb5 100644 --- a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp +++ b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp @@ -731,8 +731,10 @@ private: if (!IsGenericAttribute(index)) { continue; } - const u32 location = GetGenericAttributeLocation(index); + if (!IsAttributeEnabled(location)) { + continue; + } const auto type_descriptor = GetAttributeType(location); Id type; if (IsInputAttributeArray()) { @@ -976,6 +978,10 @@ private: return stage == ShaderType::TesselationControl; } + bool IsAttributeEnabled(u32 location) const { + return stage != ShaderType::Vertex || specialization.enabled_attributes[location]; + } + u32 GetNumInputVertices() const { switch (stage) { case ShaderType::Geometry: @@ -1192,16 +1198,20 @@ private: UNIMPLEMENTED_MSG("Unmanaged FrontFacing element={}", element); return {v_float_zero, Type::Float}; default: - if (IsGenericAttribute(attribute)) { - const u32 location = GetGenericAttributeLocation(attribute); - const auto type_descriptor = GetAttributeType(location); - const Type type = type_descriptor.type; - const Id attribute_id = input_attributes.at(attribute); - const std::vector elements = {element}; - const Id pointer = ArrayPass(type_descriptor.scalar, attribute_id, elements); - return {OpLoad(GetTypeDefinition(type), pointer), type}; + if (!IsGenericAttribute(attribute)) { + break; } - break; + const u32 location = GetGenericAttributeLocation(attribute); + if (!IsAttributeEnabled(location)) { + // Disabled attributes (also known as constant attributes) always return zero. + return {v_float_zero, Type::Float}; + } + const auto type_descriptor = GetAttributeType(location); + const Type type = type_descriptor.type; + const Id attribute_id = input_attributes.at(attribute); + const std::vector elements = {element}; + const Id pointer = ArrayPass(type_descriptor.scalar, attribute_id, elements); + return {OpLoad(GetTypeDefinition(type), pointer), type}; } UNIMPLEMENTED_MSG("Unhandled input attribute: {}", static_cast(attribute)); return {v_float_zero, Type::Float}; -- cgit v1.2.3