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i965: Use bitmask/ffs to iterate used vertex attributes.

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Replaces an iterate and test bit in a bitmask loop by a
loop only iterating over the bits set in the bitmask.

v2: Use _mesa_bit_scan{,64} instead of open coding.
v3: Use u_bit_scan{,64} instead of _mesa_bit_scan{,64}.

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
This commit is contained in:
Mathias Fröhlich 2016-05-22 14:10:19 +02:00
parent b670f0d1d7
commit 53691b7cb1
1 changed files with 5 additions and 5 deletions
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10
src/mesa/drivers/dri/i965/brw_draw.c
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@ -38,6 +38,7 @@
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "drivers/common/meta.h"
#include "util/bitscan.h"
#include "brw_blorp.h"
#include "brw_draw.h"
@ -301,16 +302,15 @@ brw_merge_inputs(struct brw_context *brw,
}
if (brw->gen < 8 && !brw->is_haswell) {
struct gl_program *vp = &ctx->VertexProgram._Current->Base;
GLbitfield64 mask = ctx->VertexProgram._Current->Base.InputsRead;
/* Prior to Haswell, the hardware can't natively support GL_FIXED or
* 2_10_10_10_REV vertex formats. Set appropriate workaround flags.
*/
for (i = 0; i < VERT_ATTRIB_MAX; i++) {
if (!(vp->InputsRead & BITFIELD64_BIT(i)))
continue;
while (mask) {
uint8_t wa_flags = 0;
i = u_bit_scan64(&mask);
switch (brw->vb.inputs[i].glarray->Type) {
case GL_FIXED: