forked from bartvdbraak/blender
Bugfix: avoid reading from an OpenGL buffer mapped write-only.
When set to solid-shading, GPU_update_grid_buffers was calling normal_quad_v3 to output into a mapped buffer, but normal_quad_v3 reads as well as writes. This fix actually makes a huge performance difference with my drivers (Gallium/Radeon).
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@ -1427,11 +1427,14 @@ void GPU_update_grid_buffers(GPU_Buffers *buffers, DMGridData **grids,
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that is what opengl will use */
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for(j = 0; j < gridsize-1; ++j) {
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for(k = 0; k < gridsize-1; ++k) {
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normal_quad_v3(vert_data[(j+1)*gridsize + (k+1)].no,
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float fno[3];
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normal_quad_v3(fno,
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grid[(j+1)*gridsize + k].co,
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grid[(j+1)*gridsize + k+1].co,
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grid[j*gridsize + k+1].co,
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grid[j*gridsize + k].co);
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copy_v3_v3(vert_data[(j+1)*gridsize + (k+1)].no, fno);
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}
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}
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}
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