Transcript
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Game Programming Tricks
Part INext-Gen Shaders
Korhan BircanApril 8th, 2008
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Shader Models
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Post Processing EffectsBlur – Combine pixel color with surrounding pixel colorsMotion Blur – Combine current frame with previous frame(s)Depth of Field – Blur pixel based on their depth valueHDR effects – Bloom, lens flare etc.Magnify bright spots Edge Glow – Find edges and blur themParallax Mapping – improved bump mapping
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Gaussian Blur// f(x) = a*e^-((x-b)^2)/r// a = 1; b = 0; r = radius;// f(x) = pow(e, -(x)^2/r)weights[i*width + j] = pow(E, -pow(dist, 2.0)*_1_over_r) );// usually just have a precomputed table
float4 PostProcessPS(float2 Tex : TEXCOORD0) : COLOR0{
float4 Color = 0;
for (int i = 0; i < m_KernelSize; i++){
Color += tex2D(m_SrcColor, Tex + TexelKernel[i].xy ) * weights[i];
}
return Color;}
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Gaussian Blur
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Radial Blur
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Radial Blur
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Motion Blur
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Depth of Field
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Depth of Field
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Depth of Field
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Depth of Field
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Haze
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Haze
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Haze
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Haze
1
32
64
96
128
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Haze
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Haze – Particle System
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High Dynamic Range (HDR) Rendering
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HDR Rendering
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HDR Rendering
•down filter 4x
•bright pass
•bloom horizontal
•bloom vertical
•up filter 4x
•combine
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HDR Rendering
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Exposure Control
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Glow
•edge detection
•down filter 4x
•blur horizontal
•blur vertical
•combine 4x
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Light Streaks
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Lens Flare
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Parallax Mapping
diffuse shading bump mapping parallax mapping
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Bump Mapping
texture map
height map
bump map
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Parallax Mappingbump mapping:
naive parallax mapping:
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Parallax Mapping
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Steep Parallax Mapping
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References•Shaders for Game Programmers and Artists, Sebastian St-Laurent
•Programming Vertex and Pixel Shaders, Wolfgang Engel
•DirectX SDK Documentation
•NVIDIA Gpu Gems Series
•Steep Parallax Mapping, Morgan McGuire, Max McGuire
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