Computer Graphics Programming I - FreeDesktop.Org

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Blending Typically used for one of a few operations:● Translucent / transparent objects• In general this is a hard problem• Objects must be rendered back to front• Polygons can't intersect● Antialiasing• Especially useful for fonts● 2D compositing• Uh...you've seen OS X, right?● Multi-pass rendering20-November-2007 © Copyright Ian D. Romanick 2007
Blend FunctionC srcF src C dst× ×F dstFragment colorSource blending factor:● GL_ZERO●●●●●●●●GL_ONEGL_SRC_ALPHAGL_ONE_MINUS_SRC_ALPHAGL_DST_COLORGL_ONE_MINUS_DST_COLORGL_DST_ALPHAGL_ONE_MINUS_DST_ALPHAGL_SRC_ALPHA_SATURATEF src= min(A s, 1 - A d)20-November-2007 © Copyright Ian D. Romanick 2007Destination blending factor:● GL_ZERO●●●●●●●GL_ONEGL_SRC_COLORGL_ONE_MINUS_SRC_COLORGL_SRC_ALPHAGL_ONE_MINUS_SRC_ALPHAGL_DST_ALPHAGL_ONE_MINUS_DST_ALPHAColor already in framebuffer
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 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 24 and 25: 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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