mesa: Use bitmask/ffs to iterate the active_samplers bitmask.
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>
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@ -36,6 +36,7 @@
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#include "compiler/glsl/glsl_parser_extras.h"
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#include "compiler/glsl/program.h"
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#include "program/hash_table.h"
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#include "util/bitscan.h"
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extern "C" void GLAPIENTRY
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@ -843,9 +844,10 @@ _mesa_uniform(struct gl_context *ctx, struct gl_shader_program *shProg,
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* been modified.
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*/
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bool changed = false;
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for (unsigned j = 0; j < ARRAY_SIZE(prog->SamplerUnits); j++) {
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if ((sh->active_samplers & (1U << j)) != 0
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&& (prog->SamplerUnits[j] != sh->SamplerUnits[j])) {
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GLbitfield mask = sh->active_samplers;
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while (mask) {
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const int j = u_bit_scan(&mask);
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if (prog->SamplerUnits[j] != sh->SamplerUnits[j]) {
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changed = true;
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break;
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}
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