Computer Graphics Programming I - FreeDesktop.Org

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Problems with Multipass Why do we want to avoid multi-passing?● It's slower.• The memory for each pixel gets accessed multiple times• Have to process the same geometry multiple times• Have to change state (e.g., textures) between passes● Less accurate• Common best-case framebuffer has 8-bits of precisionper color component• Common best-case texture combiners have 12-bits ofprecision per color component20-November-2007 © Copyright Ian D. Romanick 2007
Problems with Multipass (cont.) Why do we want to avoid multi-passing?● Can't always achieve desired result• Doesn't work well with translucent objects• Can't alway break the math down20-November-2007 © Copyright Ian D. Romanick 2007
Page 1 and 2: Computer Graphics Programming I Age
Page 3: Fog Parameters Fog has 4 main param
Page 6 and 7: Heightbased Fog Fog factor is giv
Page 8 and 9: Heightbased Fog (cont.) Store a l
Page 10 and 11: Radial Fog GL_FRAGMENT_DEPTH based
Page 12 and 13: Blending Typically used for one of
Page 14 and 15: GL_EXT_blend_colorC srcF src C dst
Page 16 and 17: Blend Equation C dstC src× ×F src
Page 18 and 19: Referenceshttp://en.wikipedia.org/w
Page 20 and 21: Multipass Rendering Please...no 5
Page 22 and 23: Problems with Multipass Why do we
Page 26 and 27: Referenceshttp://www.bluesnews.com/
Page 28: Legal Statement This work represent

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