Neil Roberts <[email protected]> writes: > When submitting the vertex buffers the i965 driver will try to recognise when > multiple attributes are using the same buffer so that it can submit a single > relocation for it and set a different offset in the attribute. Previously > however if the application happens to have the attributes in a struct with an > order that doesn't match the order they are listed in the gl_vert_attrib enum > then the loop would end up processing the attributes with a greater offset > first and the optimisation wouldn't be used. > > To make the optmisation more likely to be used this patch makes it always > process the elements in increasing order of offset. This is done copying the > element pointers into a separate array and sorting it with qsort. This only > affects the order that the elements are processed and doesn't change the order > that they are submitted to the hardware.
I would expect the sorting to cost more than the potential win you're looking for. Performance patches should come with performance data.
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