3 files changed, 44 insertions, 3 deletions

diff --git a/src/video_core/shader/shader_interpreter.cpp b/src/video_core/shader/shader_interpreter.cpp
index 063cc38f0..6b83d2c1c 100644
--- a/src/video_core/shader/shader_interpreter.cpp
+++ b/src/video_core/shader/shader_interpreter.cpp
@@ -197,12 +197,19 @@ void RunInterpreter(UnitState<Debug>& state) {
 
             case OpCode::Id::DP3:
             case OpCode::Id::DP4:
+            case OpCode::Id::DPH:
+            case OpCode::Id::DPHI:
             {
                 Record<DebugDataRecord::SRC1>(state.debug, iteration, src1);
                 Record<DebugDataRecord::SRC2>(state.debug, iteration, src2);
                 Record<DebugDataRecord::DEST_IN>(state.debug, iteration, dest);
+
+                OpCode::Id opcode = instr.opcode.Value().EffectiveOpCode();
+                if (opcode == OpCode::Id::DPH || opcode == OpCode::Id::DPHI)
+                    src1[3] = float24::FromFloat32(1.0f);
+
                 float24 dot = float24::FromFloat32(0.f);
-                int num_components = (instr.opcode.Value() == OpCode::Id::DP3) ? 3 : 4;
+                int num_components = (opcode == OpCode::Id::DP3) ? 3 : 4;
                 for (int i = 0; i < num_components; ++i)
                     dot = dot + src1[i] * src2[i];
 
diff --git a/src/video_core/shader/shader_jit_x64.cpp b/src/video_core/shader/shader_jit_x64.cpp
index a1bdd8456..366be3901 100644
--- a/src/video_core/shader/shader_jit_x64.cpp
+++ b/src/video_core/shader/shader_jit_x64.cpp
@@ -23,7 +23,7 @@ const JitFunction instr_table[64] = {
     &JitCompiler::Compile_ADD,      // add
     &JitCompiler::Compile_DP3,      // dp3
     &JitCompiler::Compile_DP4,      // dp4
-    nullptr,                        // dph
+    &JitCompiler::Compile_DPH,      // dph
     nullptr,                        // unknown
     &JitCompiler::Compile_EX2,      // ex2
     &JitCompiler::Compile_LG2,      // lg2
@@ -44,7 +44,7 @@ const JitFunction instr_table[64] = {
     nullptr,                        // unknown
     nullptr,                        // unknown
     nullptr,                        // unknown
-    nullptr,                        // dphi
+    &JitCompiler::Compile_DPH,      // dphi
     nullptr,                        // unknown
     &JitCompiler::Compile_SGE,      // sgei
     &JitCompiler::Compile_SLT,      // slti
@@ -347,6 +347,39 @@ void JitCompiler::Compile_DP4(Instruction instr) {
     Compile_DestEnable(instr, SRC1);
 }
 
+void JitCompiler::Compile_DPH(Instruction instr) {
+    if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::DPHI) {
+        Compile_SwizzleSrc(instr, 1, instr.common.src1i, SRC1);
+        Compile_SwizzleSrc(instr, 2, instr.common.src2i, SRC2);
+    } else {
+        Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
+        Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
+    }
+
+    if (Common::GetCPUCaps().sse4_1) {
+        // Set 4th component to 1.0
+        BLENDPS(SRC1, R(ONE), 0x8); // 0b1000
+        DPPS(SRC1, R(SRC2), 0xff);
+    } else {
+        // Reverse to set the 4th component to 1.0
+        SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 1, 2, 3));
+        MOVSS(SRC1, R(ONE));
+        SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 1, 2, 3));
+
+        MULPS(SRC1, R(SRC2));
+
+        MOVAPS(SRC2, R(SRC1));
+        SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(2, 3, 0, 1)); // XYZW -> ZWXY
+        ADDPS(SRC1, R(SRC2));
+
+        MOVAPS(SRC2, R(SRC1));
+        SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 1, 2, 3)); // XYZW -> WZYX
+        ADDPS(SRC1, R(SRC2));
+    }
+
+    Compile_DestEnable(instr, SRC1);
+}
+
 void JitCompiler::Compile_EX2(Instruction instr) {
     Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
     MOVSS(XMM0, R(SRC1));
diff --git a/src/video_core/shader/shader_jit_x64.h b/src/video_core/shader/shader_jit_x64.h
index b2aa5293c..fbe19fe93 100644
--- a/src/video_core/shader/shader_jit_x64.h
+++ b/src/video_core/shader/shader_jit_x64.h
@@ -37,6 +37,7 @@ public:
     void Compile_ADD(Instruction instr);
     void Compile_DP3(Instruction instr);
     void Compile_DP4(Instruction instr);
+    void Compile_DPH(Instruction instr);
     void Compile_EX2(Instruction instr);
     void Compile_LG2(Instruction instr);
     void Compile_MUL(Instruction instr);