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mesa: Use bitmask/ffs to iterate the active_samplers bitmask.

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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 34f741b080
commit 22e5d4a1ee
1 changed files with 5 additions and 3 deletions
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8
src/mesa/main/uniform_query.cpp
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@ -36,6 +36,7 @@
#include "compiler/glsl/glsl_parser_extras.h"
#include "compiler/glsl/program.h"
#include "program/hash_table.h"
#include "util/bitscan.h"
extern "C" void GLAPIENTRY
@ -843,9 +844,10 @@ _mesa_uniform(struct gl_context *ctx, struct gl_shader_program *shProg,
* been modified.
*/
bool changed = false;
for (unsigned j = 0; j < ARRAY_SIZE(prog->SamplerUnits); j++) {
if ((sh->active_samplers & (1U << j)) != 0
&& (prog->SamplerUnits[j] != sh->SamplerUnits[j])) {
GLbitfield mask = sh->active_samplers;
while (mask) {
const int j = u_bit_scan(&mask);
if (prog->SamplerUnits[j] != sh->SamplerUnits[j]) {
changed = true;
break;
}