Adaptive Glare Bloom Steerable Streaks

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Adaptive GlareBloomSteerable Streaks
???? ??????? garret-lit_at_yandex.ru peter.sikachev_at_g
mail.com
?? ?????????? Cg Tutorial, GPU Gems, ShaderX3,
GDC 2003
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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Fixed Pipeline
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Programmable Pipeline
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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Image Processing on GPU
texture
geometry
pixel shader
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Image-Space Effects

• render scene to texture
• use this texture during image processing
• render at quad with ortho camera projection

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Samples
streaks
glare
ghost (lens flare)
motion blur
adaptive antialiasing
depth of field
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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Alpha-Channel Glow Overview
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Designating Glow Sources
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Blurring Glow with Separable Convolution
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Results
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Bloom

• Repeatedly apply small blur filters

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Bloom Filter (1st pass)
1st pass
Texture sampling points
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Bloom Filter (2nd, 3rd, pass)
2nd pass
3rd pass

• SetTexture(0-3, 1st render target)

• SetTexture(0-3, 2nd render target)

Repeat as many times as you like
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Demo
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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Adaptive Glare Overview
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Luminance Computation
blending with the result of the previous frame
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Glare Texture Creation
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Final Image Composition

• Straightforward method too bright!

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Demo
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Contents

• GPU Pipeline
• Image Processing on GPU Image-Space Effects
• Alpha-Channel Glow
• Adaptive Glare
• Steerable Streaks

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Streaks Overview
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Streak Filter (1st pass)
4-pixel blur
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Streak Filter (2nd pass)
16-pixel blur
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Streaks Direction
streaks direction texture
x4 directions
3rd pass
2nd pass
1st pass
4 pixels
16 pixels
64 pixels
644 pixels
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Results
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Demo
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