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df06745c5a
Previously, we allocated space in brw_vs_prog_data's params and pull_params arrays for MAX_CLIP_PLANES vec4s---even when it wasn't necessary. On a 64-bit architecture, this used 0.5 kB of space (8 clip planes * 4 floats per plane * 8 bytes per float pointer * 2 arrays of pointers = 512 bytes). Since this cost was per-vertex shader, it added up. Conveniently, we already store the number of clip plane constants in the program key. By using that, we can allocate the exact amount of space needed. For the common case where user clipping is disabled, this means 0 bytes. While we're here, mention exactly what code requires this extra space, since it wasn't obvious. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Paul Berry <stereotype441@gmail.com> |
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