nir: Allow using nir_lower_io_to_scalar_early on VS input vars.

This will be used on V3D to cut down the size of the VS inputs in the VPM
(memory area for sharing data between shader stages).

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

diff --git a/src/compiler/nir/nir_lower_io_to_scalar.c b/src/compiler/nir/nir_lower_io_to_scalar.c
index 2b98e298cce4d1048d094c2bc5c71b299263fc2f..929761fa888394dda92ce96a4d2eec0ac7232f37 100644 (file)
--- a/src/compiler/nir/nir_lower_io_to_scalar.c
+++ b/src/compiler/nir/nir_lower_io_to_scalar.c
@@ -320,7 +320,9 @@ nir_lower_io_to_scalar_early(nir_shader *shader, nir_variable_mode mask)
                if (glsl_type_is_64bit(glsl_without_array(var->type)))
                   continue;
 
-               if (var->data.location < VARYING_SLOT_VAR0 &&
+               if (!(shader->info.stage == MESA_SHADER_VERTEX &&
+                     mode == nir_var_shader_in) &&
+                   var->data.location < VARYING_SLOT_VAR0 &&
                    var->data.location >= 0)
                   continue;