Vignette Shader

Krythic

Aug 15th, 2020

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struct Vertex
{
float4 pos : POSITION;
float2 tex : TEXTURE;
float3 norm : NORMAL;
};
struct PixelShaderArgs
{
float4 pos : SV_POSITION;
float2 col : TEXTURE;
float3 norm : NORMAL;
};
struct VignetteShaderData
{
float2 Resolution;
float Padding1;
float Padding2;
float3 Color;
float Intensity;
};
Texture2D ShaderTexture : register(t0);
SamplerState Sampler : register(s0);
float4x4 localMatrix : register(b0);
cbuffer VignetteShaderDataBuffer : register(b1)
{
VignetteShaderData VignetteData;
};
PixelShaderArgs VertexShaderMain(Vertex vertex)
{
PixelShaderArgs output;
output.pos = vertex.pos;
output.col = vertex.tex;
return output;
}
float4 PixelShaderMain(PixelShaderArgs pixelShaderArgs) : SV_Target
{
float outerRadius = 1.2;
float innerRadius = .50;
float curvature = .31; // Because 31 is dank as fuck.
float oneOverCurve = 1.0f / curvature;
float4 diffuse = ShaderTexture.Sample(Sampler, pixelShaderArgs.col);
float2 fragmentPosition = pixelShaderArgs.pos.xy / VignetteData.Resolution;
float2 curve = pow(abs(fragmentPosition * 2.0 - 1.0), float2(oneOverCurve,oneOverCurve));
float cameraEdge = pow(length(curve), curvature);
float vignette = smoothstep(innerRadius, outerRadius, cameraEdge) * VignetteData.Intensity;
diffuse.rgb = lerp(diffuse.rgb, VignetteData.Color, vignette);
return diffuse;
}

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