From 7c181fd4f4940e34bf911dd8f32857b9059a974b Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Mon, 4 Jun 2018 11:12:03 -0500
Subject: [PATCH] GPU: Implemented the ISETP_R and ISETP_C shader instructions.

---
 src/video_core/engines/shader_bytecode.h      | 10 +++++
 .../renderer_opengl/gl_shader_decompiler.cpp  | 38 +++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index da64430e99..83f7cc3a98 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -238,6 +238,16 @@ union Instruction {
         BitField<56, 1, u64> neg_b;
     } fsetp;
 
+    union {
+        BitField<0, 3, u64> pred0;
+        BitField<3, 3, u64> pred3;
+        BitField<39, 3, u64> pred39;
+        BitField<42, 1, u64> neg_pred;
+        BitField<45, 2, PredOperation> op;
+        BitField<48, 1, u64> is_signed;
+        BitField<49, 3, PredCondition> cond;
+    } isetp;
+
     union {
         BitField<39, 3, u64> pred39;
         BitField<42, 1, u64> neg_pred;
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index bb5209a7ef..b27543a656 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -1017,6 +1017,44 @@ private:
             }
             break;
         }
+        case OpCode::Type::IntegerSetPredicate: {
+            std::string op_a = regs.GetRegisterAsInteger(instr.gpr8, 0, instr.isetp.is_signed);
+
+            std::string op_b{};
+
+            ASSERT_MSG(!instr.is_b_imm, "ISETP_IMM not implemented");
+
+            if (instr.is_b_gpr) {
+                op_b += regs.GetRegisterAsInteger(instr.gpr20, 0, instr.isetp.is_signed);
+            } else {
+                // TODO(Subv): This family of instructions don't store to a GPR, but GetUniform
+                // needs to know the type of the output register.
+                op_b += regs.GetUniform(instr.uniform, instr.gpr0);
+            }
+
+            using Tegra::Shader::Pred;
+            // We can't use the constant predicate as destination.
+            ASSERT(instr.isetp.pred3 != static_cast<u64>(Pred::UnusedIndex));
+
+            std::string second_pred =
+                GetPredicateCondition(instr.isetp.pred39, instr.isetp.neg_pred != 0);
+
+            std::string comparator = GetPredicateComparison(instr.isetp.cond);
+            std::string combiner = GetPredicateCombiner(instr.isetp.op);
+
+            std::string predicate = '(' + op_a + ") " + comparator + " (" + op_b + ')';
+            // Set the primary predicate to the result of Predicate OP SecondPredicate
+            SetPredicate(instr.isetp.pred3,
+                         '(' + predicate + ") " + combiner + " (" + second_pred + ')');
+
+            if (instr.isetp.pred0 != static_cast<u64>(Pred::UnusedIndex)) {
+                // Set the secondary predicate to the result of !Predicate OP SecondPredicate,
+                // if enabled
+                SetPredicate(instr.isetp.pred0,
+                             "!(" + predicate + ") " + combiner + " (" + second_pred + ')');
+            }
+            break;
+        }
         case OpCode::Type::FloatSet: {
             std::string op_a = instr.fset.neg_a ? "-" : "";
             op_a += regs.GetRegisterAsFloat(instr.gpr8);