---
src/compiler/nir/nir.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index fab2110f619..e52a1006896 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -351,6 +351,37 @@ typedef struct nir_variable {
#define nir_foreach_variable_safe(var, var_list) \
foreach_list_typed_safe(nir_variable, var, node, var_list)
+/**
+ * Returns the bits in the inputs_read, outputs_written, or
+ * system_values_read bitfield corresponding to this variable.
+ */
+static inline uint64_t
+nir_variable_get_io_mask(nir_variable *var, gl_shader_stage stage)
+{
+ /* TODO: add support for tess patches */
+ if (var->data.patch || var->data.location < 0)
+ return 0;
+
+ assert(var->data.mode == nir_var_shader_in ||
+ var->data.mode == nir_var_shader_out ||
+ var->data.mode == nir_var_system_value);
+ assert(var->data.location >= 0);
+
+ const struct glsl_type *var_type = var->type;
+ if ((var->data.mode == nir_var_shader_in &&
+ (stage == MESA_SHADER_GEOMETRY ||
+ stage == MESA_SHADER_TESS_CTRL ||
+ stage == MESA_SHADER_TESS_EVAL)) ||
+ (var->data.mode == nir_var_shader_out &&
+ stage == MESA_SHADER_TESS_CTRL)) {
+ if (glsl_type_is_array(var_type))
+ var_type = glsl_get_array_element(var_type);
+ }
+
+ unsigned slots = glsl_count_attribute_slots(var_type, false);
+ return ((1ull << slots) - 1) << var->data.location;
+}
+
static inline bool
nir_variable_is_global(const nir_variable *var)
{
--
2.13.5
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