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 <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>

2 files changed, 14 insertions, 0 deletions

diff --git a/src/mesa/program/sampler.cpp b/src/mesa/program/sampler.cpp
index e6532be84d3..29a5408717a 100644
--- a/src/mesa/program/sampler.cpp
+++ b/src/mesa/program/sampler.cpp
@@ -134,3 +134,14 @@ _mesa_get_sampler_uniform_value(class ir_dereference *sampler,
    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;
+}
diff --git a/src/mesa/program/sampler.h b/src/mesa/program/sampler.h
index 22467e99020..8b7c3b63ed5 100644
--- a/src/mesa/program/sampler.h
+++ b/src/mesa/program/sampler.h
@@ -27,3 +27,6 @@ int
 _mesa_get_sampler_uniform_value(class ir_dereference *sampler,
 				struct gl_shader_program *shader_program,
 				const struct gl_program *prog);
+
+class ir_rvalue *
+_mesa_get_sampler_array_nonconst_index(class ir_dereference *sampler);