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Dynamic branching 3
Tuesday, April 25, 2006 | Permalink

Executable
Source code
DynamicBranching3.zip (1.1 MB)

Required:
GL_ARB_shader_objects
GL_ARB_vertex_shader
GL_ARB_fragment_shader
GL_ARB_shading_language_100
GL_EXT_framebuffer_object
This demo illustrates the benefit of dynamic branching in a per pixel lighting scenario. On the F1 dialog you can toggle dynamic branching, as well as shadows and single/multi pass. Branching is used at several places in the shader. It skips past instructions if the pixel is outside the light range, is backfacing the light, or is in shadow.

This demo should run on Radeon 9500 and on and GeForce FX and up. Only those cards supporting dynamic branching will see a performance benefit by enabling this path, that is X1300 and up and possibly also the GeForce 6 series.