glsl: Don't generate misleading debug names when packing gs inputs.

Previously, when packing geometry shader input varyings like this:

    in float foo[3];
    in float bar[3];

lower_packed_varyings would declare a packed varying like this:

    (declare (shader_in flat) (array ivec4 3) packed:foo[0],bar[0])

That's confusing, since the packed varying acutally stores all three
values of foo and all three values of bar.

This patch causes it to generate the more sensible declaration:

    (declare (shader_in flat) (array ivec4 3) packed:foo,bar)

Note that there should be no functional change for users of geometry
shaders, since the packed name is only used for generating debug
output.  But this should reduce confusion when using INTEL_DEBUG=gs.

Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/glsl/lower_packed_varyings.cpp b/src/glsl/lower_packed_varyings.cpp
index 2bcadfd55bc759311feda507365b6a54b3c03897..61ee692f6b0cbd3d788cae11c848f6e27daf93bb 100644 (file)
--- a/src/glsl/lower_packed_varyings.cpp
+++ b/src/glsl/lower_packed_varyings.cpp
@@ -506,17 +506,16 @@ lower_packed_varyings_visitor::lower_arraylike(ir_rvalue *rvalue,
       ir_constant *constant = new(this->mem_ctx) ir_constant(i);
       ir_dereference_array *dereference_array = new(this->mem_ctx)
          ir_dereference_array(rvalue, constant);
-      char *subscripted_name
-         = ralloc_asprintf(this->mem_ctx, "%s[%d]", name, i);
       if (gs_input_toplevel) {
          /* Geometry shader inputs are a special case.  Instead of storing
           * each element of the array at a different location, all elements
           * are at the same location, but with a different vertex index.
           */
          (void) this->lower_rvalue(dereference_array, fine_location,
-                                   unpacked_var, subscripted_name,
-                                   false, i);
+                                   unpacked_var, name, false, i);
       } else {
+         char *subscripted_name
+            = ralloc_asprintf(this->mem_ctx, "%s[%d]", name, i);
          fine_location =
             this->lower_rvalue(dereference_array, fine_location,
                                unpacked_var, subscripted_name,