From 90466b8830b1f08d26e12bda08fc178e143ffaed Mon Sep 17 00:00:00 2001
From: Billy Laws <blaws05@gmail.com>
Date: Fri, 21 Oct 2022 21:57:12 +0100
Subject: [PATCH] Implement depth clamp rasterisation state

Used in SMO for shadows.
---
 .../gpu/interconnect/maxwell_3d/packed_pipeline_state.cpp     | 4 ++++
 .../gpu/interconnect/maxwell_3d/packed_pipeline_state.h       | 3 +++
 .../skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp  | 2 +-
 .../skyline/gpu/interconnect/maxwell_3d/pipeline_state.cpp    | 1 +
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.cpp b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.cpp
index c28f6c39..ca5e4a69 100644
--- a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.cpp
+++ b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.cpp
@@ -340,6 +340,10 @@ namespace skyline::gpu::interconnect::maxwell3d {
         // Vulkan enum values match 1-1 with hades
         return static_cast<Shader::CompareFunction>(alphaFunc);
     }
+
+    void PackedPipelineState::SetDepthClampEnable(engine::ViewportClipControl::GeometryClip clip) {
+        depthClampEnable = (clip != engine::ViewportClipControl::GeometryClip::Passthru) && (clip != engine::ViewportClipControl::GeometryClip::FrustrumXYZClip) && (clip != engine::ViewportClipControl::GeometryClip::FrustrumZClip);
+    }
 }
 
 #pragma clang diagnostic pop
\ No newline at end of file
diff --git a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.h b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.h
index 5987331a..4920810f 100644
--- a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.h
+++ b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/packed_pipeline_state.h
@@ -57,6 +57,7 @@ namespace skyline::gpu::interconnect::maxwell3d {
             bool transformFeedbackEnable : 1;
             u8 alphaFunc : 3; //!< Use {Set,Get}AlphaFunc
             bool alphaTestEnable : 1;
+            bool depthClampEnable : 1; // Use SetDepthClampEnable
         };
 
         u32 patchSize;
@@ -141,6 +142,8 @@ namespace skyline::gpu::interconnect::maxwell3d {
 
         Shader::CompareFunction GetAlphaFunc() const;
 
+        void SetDepthClampEnable(engine::ViewportClipControl::GeometryClip clip);
+
         bool operator==(const PackedPipelineState &other) const {
             // Only hash transform feedback state if it's enabled
             if (other.transformFeedbackEnable && transformFeedbackEnable)
diff --git a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp
index f51711f5..53bc6061 100644
--- a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp
+++ b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_manager.cpp
@@ -493,6 +493,7 @@ namespace skyline::gpu::interconnect::maxwell3d {
         rasterizationCreateInfo.cullMode = vk::CullModeFlags{packedState.cullMode};
         rasterizationCreateInfo.frontFace = packedState.frontFaceClockwise ? vk::FrontFace::eClockwise : vk::FrontFace::eCounterClockwise;
         rasterizationCreateInfo.depthBiasEnable = packedState.depthBiasEnable;
+        rasterizationCreateInfo.depthClampEnable = packedState.depthClampEnable;
         rasterizationState.get<vk::PipelineRasterizationProvokingVertexStateCreateInfoEXT>().provokingVertexMode = ConvertProvokingVertex(packedState.provokingVertex);
 
         constexpr vk::PipelineMultisampleStateCreateInfo multisampleState{
@@ -651,7 +652,6 @@ namespace skyline::gpu::interconnect::maxwell3d {
 
         view.GetBuffer()->BlockSequencedCpuBackingWrites();
 
-
         return view;
     }
 
diff --git a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_state.cpp b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_state.cpp
index 32cbe5b6..0f63e10a 100644
--- a/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_state.cpp
+++ b/app/src/main/cpp/skyline/gpu/interconnect/maxwell_3d/pipeline_state.cpp
@@ -446,6 +446,7 @@ namespace skyline::gpu::interconnect::maxwell3d {
         packedState.provokingVertex = engine->provokingVertex.value;
         packedState.pointSize = engine->pointSize;
         packedState.openGlNdc = engine->zClipRange == engine::ZClipRange::NegativeWToPositiveW;
+        packedState.SetDepthClampEnable(engine->viewportClipControl.geometryClip);
     }
 
     /* Depth Stencil State */