Solid wireframe (2 стр)

truct PS_INPUT
{
    float4 position    : SV_POSITION; 
    float2 texcoords   : TEXCOORD;
    float3 barycentric : BARYCENTRIC;
};

[maxvertexcount(4)] 
void GSmain( triangle DS_OUTPUT input[3], inout TriangleStream<PS_INPUT> SpriteStream) 
{ 
  PS_INPUT output;
  
  float SCALE = 700.f;
  float2 p0 = SCALE * input[0].position.xy / input[0].position.w;
  float2 p1 = SCALE * input[1].position.xy / input[1].position.w;
  float2 p2 = SCALE * input[2].position.xy / input[2].position.w;
  float2 v0 = p2-p1;
  float2 v1 = p2-p0;
  float2 v2 = p1-p0;
  float area = abs(v1.x*v2.y - v1.y * v2.x);
  
  output.position = input[0].position;
  output.texcoords = input[0].texcoords;
  output.barycentric = float3(area/length(v0)/*area*/,0,0);
  SpriteStream.Append(output); 
  
  output.position = input[1].position;
  output.texcoords = input[1].texcoords;
  output.barycentric = float3(0,area/length(v1)/*area*/,0);
  SpriteStream.Append(output); 

  output.position = input[2].position;
  output.texcoords = input[2].texcoords;
  output.barycentric = float3(0,0,area/length(v2)/*area*/);
  SpriteStream.Append(output); 
  
  SpriteStream.RestartStrip(); 
} 

const static float4 WIRE_COL = float4(0.0,0.0,0.0,1);
const static float4 FILL_COL = float4(1,1,0.8,1);

float4 PSmain( PS_INPUT input ) : SV_TARGET 
{ 
  float4 color;
  
  float d = min(input.barycentric.x, min(input.barycentric.y, input.barycentric.z));
  float I = exp2(-2 * d * d);
 
  color = I * WIRE_COL + (1.0 - I) * FILL_COL;
  
  return color;
}