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Deferred Shading – Lighting ⇨ For each light, draw simplified bounding geometry Perform lighting for each fragment drawn Only light the areas of the scene that need lighting Read from G-buffer at the screen X/Y position Add calculated lighting to existing values Examples: Directional light: box Point light: sphere Spot light: cone 8-December-2010 © Copyright Ian D. Romanick 2009, 2010
Deferred Shading – Lighting ⇨ Optimize by letting the early stencil test discard many fragments Draw the light volume once: Disable color writes Set depth function to GL_LESS and stencil function to GL_ALWAYS Set Z-fail stencil operation to GL_REPLACE and all others to GL_KEEP Draw the light volume again: Enable color writes Set depth function to GL_LEQUAL and stencil function to GL_EQUAL Set 8-December-2010 all stencil operations GL_KEEP © Copyright Ian D. Romanick 2009, 2010
Page 1 and 2: VGP352 - Week 10 ⇨ Agenda: Mul
Page 3 and 4: MRT Uniforms Textures Varying 0 Var
Page 5 and 6: MRT - FBO Usage ⇨ Use additional
Page 7 and 8: MRT - GLSL Usage ⇨ gl_FragColor i
Page 9 and 10: Deferred Shading ⇨ Scenes with hi
Page 11 and 12: Deferred Shading ⇨ General idea:
Page 13 and 14: Deferred Shading - G-Buffer ⇨ Exa
Page 15: Deferred Shading - G-Buffer ⇨ Cry
Page 19 and 20: Deferred Shading - Lighting Light v
Page 21 and 22: Deferred Shading - Drawbacks ⇨ Wh
Page 23 and 24: References Hargreaves, S., Harris,
Page 25 and 26: Virtual Point Lights ⇨ Generate V
Page 27 and 28: Next week... ⇨ The final 8-Decemb

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