mesa: Add a new function for getting the nonconst sampler array index
If the array index is not a constant expression, the existing support
will assume a zero offset (giving us the sampler index of the base of
the array).
For dynamically uniform indexing of sampler arrays, we need both that
and the indexing expression.
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
diff --git a/src/mesa/program/sampler.cpp b/src/mesa/program/sampler.cpp
index e6532be..29a5408 100644
--- a/src/mesa/program/sampler.cpp
+++ b/src/mesa/program/sampler.cpp
@@ -134,3 +134,14 @@
return shader_program->UniformStorage[location].sampler[shader].index +
getname.offset;
}
+
+
+extern "C" class ir_rvalue *
+_mesa_get_sampler_array_nonconst_index(class ir_dereference *sampler)
+{
+ ir_dereference_array *deref_arr = sampler->as_dereference_array();
+ if (!deref_arr || deref_arr->array_index->as_constant())
+ return NULL;
+
+ return deref_arr->array_index;
+}