diff options
| -rw-r--r-- | src/mesa/shader/shader_api.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/mesa/shader/shader_api.c b/src/mesa/shader/shader_api.c index 95b7490ca9..c36fc271a0 100644 --- a/src/mesa/shader/shader_api.c +++ b/src/mesa/shader/shader_api.c @@ -1624,6 +1624,7 @@ set_program_uniform(GLcontext *ctx, struct gl_program *program, if (param->Type == PROGRAM_SAMPLER) { /* This controls which texture unit which is used by a sampler */ + GLboolean changed = GL_FALSE; GLint i; /* data type for setting samplers must be int */ @@ -1655,13 +1656,23 @@ set_program_uniform(GLcontext *ctx, struct gl_program *program, _mesa_printf("Set program %p sampler %d '%s' to unit %u\n", program, sampler, param->Name, texUnit); #endif - program->SamplerUnits[sampler] = texUnit; + if (program->SamplerUnits[sampler] != texUnit) { + program->SamplerUnits[sampler] = texUnit; + changed = GL_TRUE; + } } } - _mesa_update_shader_textures_used(program); - - FLUSH_VERTICES(ctx, _NEW_TEXTURE); + if (changed) { + /* When a sampler's value changes it usually requires rewriting + * a GPU program's TEX instructions since there may not be a + * sampler->texture lookup table. We signal this with the + * ProgramStringNotify() callback. + */ + FLUSH_VERTICES(ctx, _NEW_TEXTURE | _NEW_PROGRAM); + _mesa_update_shader_textures_used(program); + ctx->Driver.ProgramStringNotify(ctx, program->Target, program); + } } else { /* ordinary uniform variable */ |