From: Paul Berry Date: Mon, 9 Jan 2012 22:45:04 +0000 (-0800) Subject: i965 gen4-6: Fix off-by-one errors brw_create_constant_surface() X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f6f43bd5a276990c58c021bc047e60f9763df479;p=mesa.git i965 gen4-6: Fix off-by-one errors brw_create_constant_surface() Commit 9bdc44a52804a64219a0ca1a061b18596863e524 (i965: Replace struct with bit shifting for WM pull constant surfaces) accidentally introduced off-by-one errors into the calculation of the surface width, height, and depth. This patch restores the correct computation. The reason this wasn't noticed by Piglit tests is that the size of our constant surfaces is always less than 2^20, therefore the off-by-one error was causing the "depth" field of the surface to be set to all 1's. The hardware interpreted this as an extremely large surface, so overflow checking was effectively disabled. No Piglit regressions on Sandy Bridge. NOTE: This is a candidate for the 7.11 and 8.0 branches. Reviewed-by: Eric Anholt Reviewed-by: Kenneth Graunke --- diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c index dedf59437c9..b40f5e1b87a 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c +++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c @@ -698,10 +698,10 @@ brw_create_constant_surface(struct brw_context *brw, surf[1] = bo->offset; /* reloc */ - surf[2] = (((w & 0x7f) - 1) << BRW_SURFACE_WIDTH_SHIFT | - (((w >> 7) & 0x1fff) - 1) << BRW_SURFACE_HEIGHT_SHIFT); + surf[2] = ((w & 0x7f) << BRW_SURFACE_WIDTH_SHIFT | + ((w >> 7) & 0x1fff) << BRW_SURFACE_HEIGHT_SHIFT); - surf[3] = ((((w >> 20) & 0x7f) - 1) << BRW_SURFACE_DEPTH_SHIFT | + surf[3] = (((w >> 20) & 0x7f) << BRW_SURFACE_DEPTH_SHIFT | (width * 16 - 1) << BRW_SURFACE_PITCH_SHIFT); surf[4] = 0;