From: Richard Sandiford Date: Mon, 21 Jul 2014 15:53:36 +0000 (+0100) Subject: llvmpipe: Fix PIPE_FORMAT_Z32_FLOAT_S8X24_UINT handling for big-endian. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9cd4dced06aaa73d6f7b92fed5b4433569f22aca;p=mesa.git llvmpipe: Fix PIPE_FORMAT_Z32_FLOAT_S8X24_UINT handling for big-endian. llvmpipe treats PIPE_FORMAT_Z32_FLOAT_S8X24_UINT as a bit of a special case, handling it as two 32-bit pieces rather than a single 64-bit block: /* 64bit d/s format is special already extracted 32 bits */ total_bits = format_desc->block.bits > 32 ? 32 : format_desc->block.bits; The format_desc describes the whole 64-bit block, so the z shift will be 32 for big-endian. But since we're accessing the z channel as a 32-bit value rather than a 64-bit value, we need to mask the shift with 31. Signed-off-by: Richard Sandiford Reviewed-by: Roland Scheidegger Signed-off-by: Dave Airlie --- diff --git a/src/gallium/drivers/llvmpipe/lp_bld_depth.c b/src/gallium/drivers/llvmpipe/lp_bld_depth.c index 5c13ee5a58e..b6c32ffb979 100644 --- a/src/gallium/drivers/llvmpipe/lp_bld_depth.c +++ b/src/gallium/drivers/llvmpipe/lp_bld_depth.c @@ -363,7 +363,8 @@ get_z_shift_and_mask(const struct util_format_description *format_desc, return FALSE; *width = format_desc->channel[z_swizzle].size; - *shift = format_desc->channel[z_swizzle].shift; + /* & 31 is for the same reason as the 32-bit limit above */ + *shift = format_desc->channel[z_swizzle].shift & 31; if (*width == total_bits) { *mask = 0xffffffff;