Mesa (master): glsl: fix varying slot allocation for blocks and structs with explicit locations

[Timothy Arceri]

Module: Mesa
Branch: master
Commit: e58be8ac0e7ce53ed02721e1432a15f95b026b57
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e58be8ac0e7ce53ed02721e1432a15f95b026b57

Author: Timothy Arceri <timothy.arceri at collabora.com>
Date:   Wed Jan  6 20:22:46 2016 +1100

glsl: fix varying slot allocation for blocks and structs with explicit locations

Previously each member was being counted as using a single slot,
count_attribute_slots() fixes the count for array and struct members.

Also don't assign a negitive to the unsigned expl_location variable.

Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>

---

 src/glsl/ast_to_hir.cpp |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index dbf05ac..e6aec36 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -6375,12 +6375,13 @@ ast_process_struct_or_iface_block_members(exec_list *instructions,
             if (process_qualifier_constant(state, &loc, "location",
                                            qual->location, &qual_location)) {
                fields[i].location = VARYING_SLOT_VAR0 + qual_location;
-               expl_location = fields[i].location + 1;
+               expl_location = fields[i].location +
+                  fields[i].type->count_attribute_slots(false);
             }
          } else {
             if (layout && layout->flags.q.explicit_location) {
                fields[i].location = expl_location;
-               expl_location = expl_location + 1;
+               expl_location += fields[i].type->count_attribute_slots(false);
             } else {
                fields[i].location = -1;
             }
@@ -6484,7 +6485,7 @@ ast_struct_specifier::hir(exec_list *instructions,
 
    state->struct_specifier_depth++;
 
-   unsigned expl_location = -1;
+   unsigned expl_location = 0;
    if (layout && layout->flags.q.explicit_location) {
       if (!process_qualifier_constant(state, &loc, "location",
                                       layout->location, &expl_location)) {
@@ -6671,7 +6672,7 @@ ast_interface_block::hir(exec_list *instructions,
       return NULL;
    }
 
-   unsigned expl_location = -1;
+   unsigned expl_location = 0;
    if (layout.flags.q.explicit_location) {
       if (!process_qualifier_constant(state, &loc, "location",
                                       layout.location, &expl_location)) {