public static void GenerateStandardTransforms(
int interpolatorStartIndex,
int maxInterpolators,
ShaderGenerator interpolators,
ShaderGenerator vertexShader,
ShaderGenerator pixelShader,
ShaderGenerator surfaceInputs,
ShaderGraphRequirements graphRequiements,
ShaderGraphRequirements modelRequiements,
CoordinateSpace preferedCoordinateSpace)
{
if (preferedCoordinateSpace == CoordinateSpace.Tangent)
{
preferedCoordinateSpace = CoordinateSpace.World;
}
// step 1:
// *generate needed interpolators
// *generate output from the vertex shader that writes into these interpolators
// *generate the pixel shader code that declares needed variables in the local scope
var combinedRequierments = graphRequiements.Union(modelRequiements);
int interpolatorIndex = interpolatorStartIndex;
// bitangent needs normal for x product
if (combinedRequierments.requiresNormal > 0 || combinedRequierments.requiresBitangent > 0)
{
var name = preferedCoordinateSpace.ToVariableName(InterpolatorType.Normal);
interpolators.AddShaderChunk(string.Format("float3 {0} : TEXCOORD{1};", name, interpolatorIndex), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = {1};", name, ConvertBetweenSpace("v.normal", CoordinateSpace.Object, preferedCoordinateSpace, InputType.Normal)), false);
pixelShader.AddShaderChunk(string.Format("float3 {0} = normalize(IN.{0});", name), false);
interpolatorIndex++;
}
if (combinedRequierments.requiresTangent > 0 || combinedRequierments.requiresBitangent > 0)
{
var name = preferedCoordinateSpace.ToVariableName(InterpolatorType.Tangent);
interpolators.AddShaderChunk(string.Format("float3 {0} : TEXCOORD{1};", name, interpolatorIndex), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = {1};", name, ConvertBetweenSpace("v.tangent", CoordinateSpace.Object, preferedCoordinateSpace, InputType.Vector)), false);
pixelShader.AddShaderChunk(string.Format("float3 {0} = IN.{0};", name), false);
interpolatorIndex++;
}
if (combinedRequierments.requiresBitangent > 0)
{
var name = preferedCoordinateSpace.ToVariableName(InterpolatorType.BiTangent);
interpolators.AddShaderChunk(string.Format("float3 {0} : TEXCOORD{1};", name, interpolatorIndex), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = normalize(cross(o.{1}, o.{2}.xyz) * {3});",
name,
preferedCoordinateSpace.ToVariableName(InterpolatorType.Normal),
preferedCoordinateSpace.ToVariableName(InterpolatorType.Tangent),
"v.tangent.w"), false);
pixelShader.AddShaderChunk(string.Format("float3 {0} = IN.{0};", name), false);
interpolatorIndex++;
}
if (combinedRequierments.requiresViewDir > 0)
{
var name = preferedCoordinateSpace.ToVariableName(InterpolatorType.ViewDirection);
interpolators.AddShaderChunk(string.Format("float3 {0} : TEXCOORD{1};", name, interpolatorIndex), false);
var worldSpaceViewDir = "SafeNormalize(_WorldSpaceCameraPos.xyz - mul(GetObjectToWorldMatrix(), float4(v.vertex.xyz, 1.0)).xyz)";
vertexShader.AddShaderChunk(string.Format("o.{0} = {1};", name, ConvertBetweenSpace(worldSpaceViewDir, CoordinateSpace.World, preferedCoordinateSpace, InputType.Vector)), false);
pixelShader.AddShaderChunk(string.Format("float3 {0} = normalize(IN.{0});", name), false);
interpolatorIndex++;
}
if (combinedRequierments.requiresPosition > 0)
{
var name = preferedCoordinateSpace.ToVariableName(InterpolatorType.Position);
interpolators.AddShaderChunk(string.Format("float3 {0} : TEXCOORD{1};", name, interpolatorIndex), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = {1};", name, ConvertBetweenSpace("v.vertex", CoordinateSpace.Object, preferedCoordinateSpace, InputType.Position)), false);
pixelShader.AddShaderChunk(string.Format("float3 {0} = IN.{0};", name), false);
interpolatorIndex++;
}
if (combinedRequierments.NeedsTangentSpace())
{
pixelShader.AddShaderChunk(string.Format("float3x3 tangentSpaceTransform = float3x3({0},{1},{2});",
preferedCoordinateSpace.ToVariableName(InterpolatorType.Tangent), preferedCoordinateSpace.ToVariableName(InterpolatorType.BiTangent), preferedCoordinateSpace.ToVariableName(InterpolatorType.Normal)), false);
}
ShaderGenerator.GenerateSpaceTranslationPixelShader(combinedRequierments.requiresNormal, InterpolatorType.Normal, preferedCoordinateSpace,
InputType.Normal, pixelShader, Dimension.Three);
ShaderGenerator.GenerateSpaceTranslationPixelShader(combinedRequierments.requiresTangent, InterpolatorType.Tangent, preferedCoordinateSpace,
InputType.Vector, pixelShader, Dimension.Three);
ShaderGenerator.GenerateSpaceTranslationPixelShader(combinedRequierments.requiresBitangent, InterpolatorType.BiTangent, preferedCoordinateSpace,
InputType.Vector, pixelShader, Dimension.Three);
ShaderGenerator.GenerateSpaceTranslationPixelShader(combinedRequierments.requiresViewDir, InterpolatorType.ViewDirection, preferedCoordinateSpace,
InputType.Vector, pixelShader, Dimension.Three);
ShaderGenerator.GenerateSpaceTranslationPixelShader(combinedRequierments.requiresPosition, InterpolatorType.Position, preferedCoordinateSpace,
InputType.Position, pixelShader, Dimension.Three);
if (combinedRequierments.requiresVertexColor)
{
interpolators.AddShaderChunk(string.Format("float4 {0} : COLOR;", ShaderGeneratorNames.VertexColor), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = v.color;", ShaderGeneratorNames.VertexColor), false);
pixelShader.AddShaderChunk(string.Format("float4 {0} = IN.{0};", ShaderGeneratorNames.VertexColor), false);
}
if (combinedRequierments.requiresScreenPosition)
{
interpolators.AddShaderChunk(string.Format("float4 {0} : TEXCOORD{1};", ShaderGeneratorNames.ScreenPosition, interpolatorIndex), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = ComputeScreenPos(UnityObjectToClipPos(v.vertex));", ShaderGeneratorNames.ScreenPosition), false);
pixelShader.AddShaderChunk(string.Format("float4 {0} = IN.{0};", ShaderGeneratorNames.ScreenPosition), false);
interpolatorIndex++;
}
foreach (var channel in combinedRequierments.requiresMeshUVs.Distinct())
{
interpolators.AddShaderChunk(string.Format("half4 {0} : TEXCOORD{1};", channel.GetUVName(), interpolatorIndex == 0 ? "" : interpolatorIndex.ToString()), false);
vertexShader.AddShaderChunk(string.Format("o.{0} = v.texcoord{1};", channel.GetUVName(), (int)channel), false);
pixelShader.AddShaderChunk(string.Format("float4 {0} = IN.{0};", channel.GetUVName()), false);
interpolatorIndex++;
}
// step 2
// copy the locally defined values into the surface description
// structure using the requirements for ONLY the shader graph
// additional requirements have come from the lighting model
// and are not needed in the shader graph
var replaceString = "surfaceInput.{0} = {0};";
GenerateSpaceTranslationSurfaceInputs(graphRequiements.requiresNormal, InterpolatorType.Normal, surfaceInputs, replaceString);
GenerateSpaceTranslationSurfaceInputs(graphRequiements.requiresTangent, InterpolatorType.Tangent, surfaceInputs, replaceString);
GenerateSpaceTranslationSurfaceInputs(graphRequiements.requiresBitangent, InterpolatorType.BiTangent, surfaceInputs, replaceString);
GenerateSpaceTranslationSurfaceInputs(graphRequiements.requiresViewDir, InterpolatorType.ViewDirection, surfaceInputs, replaceString);
GenerateSpaceTranslationSurfaceInputs(graphRequiements.requiresPosition, InterpolatorType.Position, surfaceInputs, replaceString);
if (graphRequiements.requiresVertexColor)
{
surfaceInputs.AddShaderChunk(string.Format("surfaceInput.{0} = {0};", ShaderGeneratorNames.VertexColor), false);
}
if (graphRequiements.requiresScreenPosition)
{
surfaceInputs.AddShaderChunk(string.Format("surfaceInput.{0} = {0};", ShaderGeneratorNames.ScreenPosition), false);
}
foreach (var channel in graphRequiements.requiresMeshUVs.Distinct())
{
surfaceInputs.AddShaderChunk(string.Format("surfaceInput.{0} = {0};", channel.GetUVName()), false);
}
}