| cbuffer ConstantBuffer : register(b0) |
| { |
| float4x4 qt_Matrix; |
| float qt_Opacity; |
| float relativeSizeX; |
| float relativeSizeY; |
| float spread; |
| float4 color; |
| } |
| |
| float linearstep(float e0, float e1, float x) { return clamp((x - e0) / (e1 - e0), 0.0, 1.0); } |
| |
| float4 main(float4 position : SV_POSITION, float2 coord : TEXCOORD0) : SV_TARGET |
| { |
| float alpha = |
| smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - coord.x)) * |
| smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - coord.y)); |
| |
| float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha); |
| return color * qt_Opacity * spreadMultiplier * spreadMultiplier; |
| } |