Improve glsl shader performance #211
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Riiight, forgot to rebase. |
Use fragment depth from built-in gl_FragCoord instead of our own depth attribute
Adds few fps. Function seems to be too complex for my understanding.
Saturated sum of positive values is equal to saturated sum of saturated values
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There is room for improvement, for example texture matrix, but it will require changing rendering code, so it will not be here for sake of simplicity. |
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Most optimizations are done by abusing mathematical properties and replacing slow on some hardware(e.g. Inetl) min and max with saturation.
For example dot product is in range [-1, 1], so
max(0, dot(...))=sat(dot(...)).In places where this potentially can mess with HDR comments were added.