28 lines
931 B
HLSL
28 lines
931 B
HLSL
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sampler2D inputTex : register(S0);
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float2 mousePos : register(C0);
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float2 uiSize : register(C1);
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float lightSize : register(C2);
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float intensity : register(C3);
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float4 lightColor : register(C4);
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static const float PI = 3.14159265f;
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float4 main(float2 uv : TEXCOORD) : COLOR
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{
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//UI的源颜色
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float4 sourceColor = tex2D(inputTex, uv);
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//计算当前UV值的实际尺寸坐标
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float xPos = uv.x * uiSize.x;
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float yPos = uv.y * uiSize.y;
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//计算当前片元和鼠标位置的实际距离
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float distanceMouseFrag = length(float2(xPos - mousePos.x, yPos - mousePos.y));
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//归一化距离(0~1)
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float uniformedDistance = min(distanceMouseFrag / lightSize,1);
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//距离转渐进强度(1~0)
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float intensityFrag = cos(uniformedDistance * PI) / 2.0f + 0.5f;
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//计算线性减淡
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float3 linearDodge = sourceColor.xyz + lightColor.xyz * intensityFrag * intensity * sourceColor.a;
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return float4(linearDodge, sourceColor.a);
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}
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