Implement OpDot

renderdoc/driver/shaders/spirv/spirv_debug.cpp

@@ -1168,6 +1168,25 @@ void ThreadState::StepNext(ShaderDebugState *state,
       SetDst(state, math.result, var);
       break;
     }
+    case Op::Dot:
+    {
+      OpDot dot(it);
+
+      ShaderVariable var = GetSrc(dot.vector1);
+      ShaderVariable b = GetSrc(dot.vector2);
+
+      RDCASSERTEQUAL(var.columns, b.columns);
+
+      float ret = 0;
+      for(uint8_t c = 0; c < var.columns; c++)
+        ret += var.value.fv[c] * b.value.fv[c];
+
+      var.columns = 1;
+      var.value.f.x = ret;
+
+      SetDst(state, dot.result, var);
+      break;
+    }
     case Op::VectorTimesScalar:
     {
       OpVectorTimesScalar mul(it);

util/test/demos/vk/vk_shader_debug_zoo.cpp

@@ -264,6 +264,13 @@ void main()
       Color = vec4(cross(a, b), 1.0f);
       break;
     }
+    case 25:
+    {
+      vec4 a = vec4(posone*2.5f, negone*1.8f, posone*8.5f, posone*3.9f);
+      vec4 b = vec4(negone*6.3f, posone*3.2f, negone*0.4f, zerof);
+      Color = vec4(dot(a.xyz, b.xyz), dot(a.w, b.w), dot(a, b), dot(a.wz, b.ww));
+      break;
+    }
     default: break;
   }
 }