From 183855e396cc6918d36fbf3e38ea426e934b4e3e Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Thu, 15 Apr 2021 22:46:11 -0300
Subject: shader: Implement tessellation shaders, polygon mode and invocation
 id

---
 src/shader_recompiler/frontend/maxwell/program.cpp |  5 ++++
 .../translate/impl/load_store_attribute.cpp        | 33 +++++++++++++---------
 .../translate/impl/move_special_register.cpp       |  2 ++
 3 files changed, 27 insertions(+), 13 deletions(-)

(limited to 'src/shader_recompiler/frontend/maxwell')

diff --git a/src/shader_recompiler/frontend/maxwell/program.cpp b/src/shader_recompiler/frontend/maxwell/program.cpp
index ab67446c8..20a1d61cc 100644
--- a/src/shader_recompiler/frontend/maxwell/program.cpp
+++ b/src/shader_recompiler/frontend/maxwell/program.cpp
@@ -70,6 +70,11 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
     program.stage = env.ShaderStage();
     program.local_memory_size = env.LocalMemorySize();
     switch (program.stage) {
+    case Stage::TessellationControl: {
+        const ProgramHeader& sph{env.SPH()};
+        program.invocations = sph.common2.threads_per_input_primitive;
+        break;
+    }
     case Stage::Geometry: {
         const ProgramHeader& sph{env.SPH()};
         program.output_topology = sph.common3.output_topology;
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/load_store_attribute.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/load_store_attribute.cpp
index eb6a80de2..7d7dcc3cb 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/load_store_attribute.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/load_store_attribute.cpp
@@ -70,12 +70,6 @@ void TranslatorVisitor::ALD(u64 insn) {
         BitField<47, 2, Size> size;
     } const ald{insn};
 
-    if (ald.o != 0) {
-        throw NotImplementedException("O");
-    }
-    if (ald.patch != 0) {
-        throw NotImplementedException("P");
-    }
     const u64 offset{ald.absolute_offset.Value()};
     if (offset % 4 != 0) {
         throw NotImplementedException("Unaligned absolute offset {}", offset);
@@ -84,11 +78,19 @@ void TranslatorVisitor::ALD(u64 insn) {
     const u32 num_elements{NumElements(ald.size)};
     if (ald.index_reg == IR::Reg::RZ) {
         for (u32 element = 0; element < num_elements; ++element) {
-            const IR::Attribute attr{offset / 4 + element};
-            F(ald.dest_reg + element, ir.GetAttribute(attr, vertex));
+            if (ald.patch != 0) {
+                const IR::Patch patch{offset / 4 + element};
+                F(ald.dest_reg + element, ir.GetPatch(patch));
+            } else {
+                const IR::Attribute attr{offset / 4 + element};
+                F(ald.dest_reg + element, ir.GetAttribute(attr, vertex));
+            }
         }
         return;
     }
+    if (ald.patch != 0) {
+        throw NotImplementedException("Indirect patch read");
+    }
     HandleIndexed(*this, ald.index_reg, num_elements, [&](u32 element, IR::U32 final_offset) {
         F(ald.dest_reg + element, ir.GetAttributeIndexed(final_offset, vertex));
     });
@@ -106,9 +108,6 @@ void TranslatorVisitor::AST(u64 insn) {
         BitField<47, 2, Size> size;
     } const ast{insn};
 
-    if (ast.patch != 0) {
-        throw NotImplementedException("P");
-    }
     if (ast.index_reg != IR::Reg::RZ) {
         throw NotImplementedException("Indexed store");
     }
@@ -120,11 +119,19 @@ void TranslatorVisitor::AST(u64 insn) {
     const u32 num_elements{NumElements(ast.size)};
     if (ast.index_reg == IR::Reg::RZ) {
         for (u32 element = 0; element < num_elements; ++element) {
-            const IR::Attribute attr{offset / 4 + element};
-            ir.SetAttribute(attr, F(ast.src_reg + element), vertex);
+            if (ast.patch != 0) {
+                const IR::Patch patch{offset / 4 + element};
+                ir.SetPatch(patch, F(ast.src_reg + element));
+            } else {
+                const IR::Attribute attr{offset / 4 + element};
+                ir.SetAttribute(attr, F(ast.src_reg + element), vertex);
+            }
         }
         return;
     }
+    if (ast.patch != 0) {
+        throw NotImplementedException("Indexed tessellation patch store");
+    }
     HandleIndexed(*this, ast.index_reg, num_elements, [&](u32 element, IR::U32 final_offset) {
         ir.SetAttributeIndexed(final_offset, F(ast.src_reg + element), vertex);
     });
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/move_special_register.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/move_special_register.cpp
index bc822d585..660b84c20 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/move_special_register.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/move_special_register.cpp
@@ -113,6 +113,8 @@ enum class SpecialRegister : u64 {
 
 [[nodiscard]] IR::U32 Read(IR::IREmitter& ir, SpecialRegister special_register) {
     switch (special_register) {
+    case SpecialRegister::SR_INVOCATION_ID:
+        return ir.InvocationId();
     case SpecialRegister::SR_THREAD_KILL:
         return IR::U32{ir.Select(ir.IsHelperInvocation(), ir.Imm32(-1), ir.Imm32(0))};
     case SpecialRegister::SR_INVOCATION_INFO:
-- 
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