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6 float in 32 bits

Light Pre Pass Deferred lighting

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Page 1: Light Pre Pass Deferred lighting

6 float in 32 bits

Page 2: Light Pre Pass Deferred lighting
Page 3: Light Pre Pass Deferred lighting

• Model

• Camera

• Light

• Shader

Page 4: Light Pre Pass Deferred lighting
Page 5: Light Pre Pass Deferred lighting

• For each object

• Encontrar las luces que afectan al objeto

• Renderizar todas las luces y materiales en una pasada

• Explosión de combinaciones• Shader por cada material y tipo de luz

• Perdida de ciclos de GPU• Overdraw

• Triangles fuera del rango de la luz

Page 6: Light Pre Pass Deferred lighting

• For each light

• For each object

• Añadir la contribución de luz

• Shaders para cada tipo de material y luz

• Perdida de ciclos de GPU• Overdraw

• Triangles fuera del rango de la luz

Page 7: Light Pre Pass Deferred lighting
Page 8: Light Pre Pass Deferred lighting

• For each object

• Almacenar todo lo necesario en el G-Buffer

• For each light and pixel iluminado• Usar el G-Buffer para el cálculo de luz

• Añadir el resultado al frame buffer

• Shaders simples

• Elimina la limitación del número de luces

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G-Buffer Final Image

Page 17: Light Pre Pass Deferred lighting
Page 18: Light Pre Pass Deferred lighting

• Multi Render Target (MRT)

• Ancho de banda elevado

• MSAA

• No contempla objetos transparentes

• Materiales limitados a la información en G-Buffer

Page 19: Light Pre Pass Deferred lighting

• For each object

• Almacenar Position y Normal

• For each light • Dibujar un volumen de luz

• Calculo de luz con la información almacenada

• Acumular el calculo sobre un lightingRT

• For each object• Dibujar cada pixel utilizando la iluminación

almacenada

Page 20: Light Pre Pass Deferred lighting

• Compresión de normales• Store X & Y, reconstruct Z

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• Reconstrucción de Position• Almacenar depth (z / w)

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• Reconstrucción de Position

Screen Space

TexCoord X

TexCoord Y

Page 23: Light Pre Pass Deferred lighting

• Reconstrucción de Position

Page 24: Light Pre Pass Deferred lighting

• Desktop (Windows, Linux, MacOS)• DepthBuffer supported

8R (8bits) G (8 bits) B (8 bits) A (8 bits)

Normal X Normal Y Normal Z Specular Power

Depth (24 bits) S8

Page 25: Light Pre Pass Deferred lighting

• Windows Metro• DirectX 9_1 (No Depth, no MRT)

• Windows Phone• DirectX 9_3 (Depth supported)

R (8 bits) G (8 bits) B (8 bits) A (8 bits)

Normal X Normal Y Normal Z Specular Power

Depth (24 bits) S8

R (8 bits) G (8 bits) B (8 bits) A (8 bits)

Normal 1 Normal 2 Depth (16 bits)

Page 26: Light Pre Pass Deferred lighting

• iOS• DepthTexture extensión

R (8 bits) G (8 bits) B (8 bits) A (8 bits)

Normal X Normal Y Normal Z Specular Power

Depth (24 bits) S8

Page 27: Light Pre Pass Deferred lighting

• Android• DepthTexture extensión (OpenGL ES 2.0)

• Tegra GPU (MRT supported)

R (8 bits) G (8 bits) B (8 bits) A (8 bits)

Normal X Normal Y Normal Z Specular Power

Depth (24 bits) S8

R (8 bits) G (8 bits) B (8 bits) A (8 bits)

Normal X Normal Y Normal Z Specular Power

Depth (32 bits)

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Thank you

Javier Cantón Ferrero

@jcant0n

http://geeks.ms/blogs/jcanton/


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