Implementing DPH/DPHI vertex shader opcodes

src/video_core/vertex_shader.cpp

@@ -230,6 +230,21 @@ static void ProcessShaderCode(VertexShaderState& state) {
                 break;
             }
 
+            case OpCode::Id::DPH:
+            case OpCode::Id::DPHI:
+            {
+                float24 dot = src2[3];
+                for (int i = 0; i < 3; ++i)
+                    dot += src1[i] * src2[i];
+
+                for (int i = 0; i < 4; ++i) {
+                    if (!swizzle.DestComponentEnabled(i))
+                        continue;
+                    dest[i] = dot;
+                }
+                break;
+            }
+
             // Reciprocal
             case OpCode::Id::RCP:
             {