Merge pull request #2695 from ReinUsesLisp/layer-viewport

gl_shader_decompiler: Implement gl_ViewportIndex and gl_Layer in vertex shaders

src/video_core/shader/shader_ir.cpp

@@ -89,6 +89,22 @@ Node ShaderIR::GetPhysicalInputAttribute(Tegra::Shader::Register physical_addres
 }
 
 Node ShaderIR::GetOutputAttribute(Attribute::Index index, u64 element, Node buffer) {
+    if (index == Attribute::Index::LayerViewportPointSize) {
+        switch (element) {
+        case 0:
+            UNIMPLEMENTED();
+            break;
+        case 1:
+            uses_layer = true;
+            break;
+        case 2:
+            uses_viewport_index = true;
+            break;
+        case 3:
+            uses_point_size = true;
+            break;
+        }
+    }
     if (index == Attribute::Index::ClipDistances0123 ||
         index == Attribute::Index::ClipDistances4567) {
         const auto clip_index =

src/video_core/shader/shader_ir.h

@@ -115,6 +115,18 @@ public:
         return static_cast<std::size_t>(coverage_end * sizeof(u64));
     }
 
+    bool UsesLayer() const {
+        return uses_layer;
+    }
+
+    bool UsesViewportIndex() const {
+        return uses_viewport_index;
+    }
+
+    bool UsesPointSize() const {
+        return uses_point_size;
+    }
+
     bool HasPhysicalAttributes() const {
         return uses_physical_attributes;
     }
@@ -346,6 +358,9 @@ private:
     std::set<Image> used_images;
     std::array<bool, Tegra::Engines::Maxwell3D::Regs::NumClipDistances> used_clip_distances{};
     std::map<GlobalMemoryBase, GlobalMemoryUsage> used_global_memory;
+    bool uses_layer{};
+    bool uses_viewport_index{};
+    bool uses_point_size{};
     bool uses_physical_attributes{}; // Shader uses AL2P or physical attribute read/writes
 
     Tegra::Shader::Header header;