From 98c730a644a15e37cc7e32d64b4bdb8180d45a2d Mon Sep 17 00:00:00 2001
From: PixelyIon <pixelyion@protonmail.com>
Date: Fri, 6 May 2022 14:58:20 +0530
Subject: [PATCH] Implement linked TIC/TSC handle in Maxwell3D

Maxwell3D has a register for linking the TIC/TSC index in bindless texture handles, this is used by games to implement bindless combined texture-sampler handles.
---
 .../main/cpp/skyline/gpu/interconnect/graphics_context.h  | 8 ++++++++
 app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp | 4 ++++
 app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.h   | 2 ++
 3 files changed, 14 insertions(+)

diff --git a/app/src/main/cpp/skyline/gpu/interconnect/graphics_context.h b/app/src/main/cpp/skyline/gpu/interconnect/graphics_context.h
index d725b86e..639915aa 100644
--- a/app/src/main/cpp/skyline/gpu/interconnect/graphics_context.h
+++ b/app/src/main/cpp/skyline/gpu/interconnect/graphics_context.h
@@ -1176,6 +1176,8 @@ namespace skyline::gpu::interconnect {
 
                         auto &constantBuffer{pipelineStage.constantBuffers[texture.cbuf_index]};
                         BindlessTextureHandle handle{constantBuffer.Read<u32>(executor, texture.cbuf_offset)};
+                        if (tscIndexLinked)
+                            handle.samplerIndex = handle.textureIndex;
 
                         auto sampler{GetSampler(handle.samplerIndex)};
                         auto textureView{GetPoolTextureView(handle.textureIndex)};
@@ -2292,6 +2294,8 @@ namespace skyline::gpu::interconnect {
 
         /* Samplers */
       private:
+        bool tscIndexLinked{}; //!< If the TSC index in bindless texture handles is the same as the TIC index or if it's independent from the TIC index
+
         struct Sampler : public vk::raii::Sampler, public FenceCycleDependency {
             using vk::raii::Sampler::Sampler;
         };
@@ -2319,6 +2323,10 @@ namespace skyline::gpu::interconnect {
             samplerPool.samplerControls = nullptr;
         }
 
+        void SetTscIndexLinked(bool isTscIndexLinked) {
+            tscIndexLinked = isTscIndexLinked;
+        }
+
       private:
         vk::Filter ConvertSamplerFilter(TextureSamplerControl::Filter filter) {
             using TscFilter = TextureSamplerControl::Filter;
diff --git a/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp b/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp
index a67a96b5..5bde3d22 100644
--- a/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp
+++ b/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.cpp
@@ -129,6 +129,10 @@ namespace skyline::soc::gm20b::engine::maxwell3d {
                     context.SetDepthRenderTargetArrayMode(depthTargetArrayMode);
                 })
 
+                ENGINE_CASE(linkedTscHandle, {
+                    context.SetTscIndexLinked(linkedTscHandle);
+                });
+
                 #define VIEWPORT_TRANSFORM_CALLBACKS(_z, index, data)                                     \
                 ENGINE_ARRAY_STRUCT_CASE(viewportTransforms, index, scaleX, {                             \
                     context.SetViewportX(index, scaleX, registers.viewportTransforms[index].translateX);  \
diff --git a/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.h b/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.h
index 27582f41..27900fe8 100644
--- a/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.h
+++ b/app/src/main/cpp/skyline/soc/gm20b/engines/maxwell_3d.h
@@ -151,6 +151,8 @@ namespace skyline::soc::gm20b::engine::maxwell3d {
             Register<0x48B, u32> depthTargetHeight;
             Register<0x48C, type::RenderTargetArrayMode> depthTargetArrayMode;
 
+            Register<0x48D, bool> linkedTscHandle; //!< If enabled, the TSC index in a bindless texture handle is ignored and the TIC index is used as the TSC index, otherwise the TSC index from the bindless texture handle is used
+
             Register<0x4B3, u32> depthTestEnable;
             Register<0x4B9, u32> independentBlendEnable;
             Register<0x4BA, u32> depthWriteEnable;