blob: 451969611ec383b1710c8e5ac19bdec49c2c3c71 [file] [log] [blame]
cbuffer UniformBlock0 : register(b0)
{
float4x4 model_view_matrix;
float4x4 proj_matrix;
float4x4 model_view_proj_matrix;
float3x3 normal_matrix;
float3 color;
float3 view_dir;
float3 tess_factor;
};
// =============================================================================
// Hull Shader
// =============================================================================
struct HSInput {
float3 PositionWS : POSITION;
float3 NormalWS : NORMAL;
};
struct HSOutput {
float3 PositionWS : POSITION;
};
struct HSTrianglePatchConstant {
float EdgeTessFactor[3] : SV_TessFactor;
float InsideTessFactor : SV_InsideTessFactor;
float3 NormalWS[3] : NORMAL;
};
HSTrianglePatchConstant HSPatchConstant(InputPatch<HSInput, 3> patch)
{
float3 roundedEdgeTessFactor = tess_factor;
float roundedInsideTessFactor = 3;
float insideTessFactor = 1;
HSTrianglePatchConstant result;
// Edge and inside tessellation factors
result.EdgeTessFactor[0] = roundedEdgeTessFactor.x;
result.EdgeTessFactor[1] = roundedEdgeTessFactor.y;
result.EdgeTessFactor[2] = roundedEdgeTessFactor.z;
result.InsideTessFactor = roundedInsideTessFactor;
// Constant data
result.NormalWS[0] = patch[0].NormalWS;
result.NormalWS[1] = patch[1].NormalWS;
result.NormalWS[2] = patch[2].NormalWS;
return result;
}
[domain("tri")]
[partitioning("fractional_odd")]
[outputtopology("triangle_ccw")]
[outputcontrolpoints(3)]
[patchconstantfunc("HSPatchConstant")]
HSOutput HSMain(
InputPatch<HSInput, 3> patch,
uint id : SV_OutputControlPointID
)
{
HSOutput output;
output.PositionWS = patch[id].PositionWS;
return output;
}
// =============================================================================
// Geometry Shader
// =============================================================================
struct GSVertexInput {
float3 PositionWS : POSITION;
float3 NormalWS : NORMAL;
};
struct GSVertexOutput {
float4 PositionCS : SV_POSITION;
};
[maxvertexcount(6)]
void GSMain(
triangle GSVertexInput input[3],
inout LineStream<GSVertexOutput> output
)
{
float3 P0 = input[0].PositionWS.xyz;
float3 P1 = input[1].PositionWS.xyz;
float3 P2 = input[2].PositionWS.xyz;
GSVertexOutput vertex;
// Totally hacky...
P0.z += 0.001;
P1.z += 0.001;
P2.z += 0.001;
float4 Q0 = mul(proj_matrix, float4(P0, 1.0));
float4 Q1 = mul(proj_matrix, float4(P1, 1.0));
float4 Q2 = mul(proj_matrix, float4(P2, 1.0));
// Edge 0
vertex.PositionCS = Q0;
output.Append(vertex);
vertex.PositionCS = Q1;
output.Append(vertex);
output.RestartStrip();
// Edge 1
vertex.PositionCS = Q1;
output.Append(vertex);
vertex.PositionCS = Q2;
output.Append(vertex);
output.RestartStrip();
// Edge 2
vertex.PositionCS = Q2;
output.Append(vertex);
vertex.PositionCS = Q0;
output.Append(vertex);
output.RestartStrip();
}