Reducing startup time significantly

res/shaders/lib/MaterialParameter.slang

@@ -1,17 +1,80 @@
+import Common;
+
 struct MaterialParameter
 {
-	float3 position_TS;
-	float3 worldPosition;
-	float2 texCoords;
-	float3 normal;
-	float3 tangent;
-	float3 biTangent;
-	float3 viewDir_TS;
-	float3 vertexColor;
-}
+	float3 position_TS : POSITION0;
+	float3 position_WS : POSITION1;
+	float2 texCoords : TEXCOORDS0;
+	float3 vertexColor : COLOR0;
+};
 
+// data used by light environment
+struct LightingParameter
+{
+	// world to tangent space
+	float3x3 tbn;
+	float3 position_TS;
+	float3 viewDir_TS;
+};
+
+// data passed to fragment shader
+struct FragmentParameter
+{
+	float3 position_TS;
+	float3 viewDir_TS;
+	float3 normal_WS;
+	float3 tangent_WS;
+	float3 biTangent_WS;
+	float3 position_WS;
+	float4 position_CS : SV_Position;
+	float2 texCoords;
+	float3 vertexColor;
+	MaterialParameter getMaterialParameter()
+	{
+		MaterialParameter result;
+		result.position_TS = position_TS;
+		result.position_WS = position_WS;
+		result.texCoords = texCoords;
+		result.vertexColor = vertexColor;
+		return result;
+	}
+	LightingParameter getLightingParameter()
+	{
+		LightingParameter result;
+		result.tbn = transpose(float3x3(normalize(tangent_WS), normalize(biTangent_WS), normalize(normal_WS)));
+		result.position_TS = position_TS;
+		result.viewDir_TS = viewDir_TS;
+		return result;
+	}
+};
+
+// data retrieved from VertexData
 struct VertexAttributes
 {
-	MaterialParameter parameter : PARAMETER;
-	float4 clipPosition: SV_POSITION;
+	float3 normal_MS;
+	float3 tangent_MS;
+	float3 biTangent_MS;
+	float3 position_WS;
+	float4 position_CS;
+	float2 texCoords;
+	float3 vertexColor;
+	FragmentParameter getParameter(float4x4 transformMatrix)
+	{
+		float3 tangent_WS = mul(transformMatrix, float4(normalize(tangent_MS), 0)).xyz;
+		float3 biTangent_WS = mul(transformMatrix, float4(normalize(biTangent_MS), 0)).xyz;
+		float3 normal_WS = mul(transformMatrix, float4(normalize(normal_MS), 0)).xyz;
+		// Transforms from world space into tangent space
+		float3x3 tbn = transpose(float3x3(tangent_WS, biTangent_WS, normal_WS));
+		FragmentParameter result;
+		result.position_TS = mul(tbn, position_WS);
+		result.viewDir_TS = mul(tbn, pViewParams.cameraPos_WS.xyz - position_WS);
+		result.normal_WS = normal_WS;
+		result.tangent_WS = tangent_WS;
+		result.biTangent_WS = biTangent_WS;
+		result.position_WS = position_WS;
+		result.position_CS = position_CS;
+		result.texCoords = texCoords;
+		result.vertexColor = vertexColor;
+		return result;
+	}
 };