wehub-resource-sync
31 lines
830 B
HLSL
31 lines
830 B
HLSL
// Blur while downsampling (Kawase-style 4-tap). DC gain = 1.0.
|
|
|
|
cbuffer DownParams : register(b0)
|
|
{
|
|
float2 InvSrcSize; // 1/srcWidth, 1/srcHeight
|
|
float OffsetPx; // in SOURCE pixels
|
|
float _pad0;
|
|
};
|
|
|
|
Texture2D Src : register(t0);
|
|
SamplerState LinearSampler : register(s0);
|
|
|
|
struct PS_INPUT
|
|
{
|
|
float4 pos : SV_POSITION;
|
|
float2 uv : TEXCOORD0;
|
|
};
|
|
|
|
float4 psMain(PS_INPUT i) : SV_Target
|
|
{
|
|
float2 d = InvSrcSize * OffsetPx;
|
|
|
|
// 4 taps on a square (bilinear fetches)
|
|
float4 c =
|
|
Src.SampleLevel(LinearSampler, i.uv + float2(-d.x, -d.y), 0) +
|
|
Src.SampleLevel(LinearSampler, i.uv + float2(d.x, -d.y), 0) +
|
|
Src.SampleLevel(LinearSampler, i.uv + float2(-d.x, d.y), 0) +
|
|
Src.SampleLevel(LinearSampler, i.uv + float2(d.x, d.y), 0);
|
|
|
|
return c * 0.25f; // weights sum to 1
|
|
} |