[Mesa-dev] [PATCH 14/28] glsl: pass disable_varying_packing bool to the lowering pass

[Timothy Arceri]

This will allow us to choose to ignore the disable which will be
useful for allowing support of the component layout qualifier while
still disabling packing for varyings without an explicit component.
---
 src/glsl/ir_optimization.h         |  3 ++-
 src/glsl/link_varyings.cpp         | 18 +++++++++---------
 src/glsl/lower_packed_varyings.cpp | 18 +++++++++++++-----
 3 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/src/glsl/ir_optimization.h b/src/glsl/ir_optimization.h
index dabd80a..19ebf86 100644
--- a/src/glsl/ir_optimization.h
+++ b/src/glsl/ir_optimization.h
@@ -128,7 +128,8 @@ void lower_shared_reference(struct gl_shader *shader, unsigned *shared_size);
 void lower_ubo_reference(struct gl_shader *shader);
 void lower_packed_varyings(void *mem_ctx,
                            unsigned locations_used, ir_variable_mode mode,
-                           unsigned gs_input_vertices, gl_shader *shader);
+                           unsigned gs_input_vertices, gl_shader *shader,
+                           bool disable_varying_packing);
 bool lower_vector_insert(exec_list *instructions, bool lower_nonconstant_index);
 bool lower_vector_derefs(gl_shader *shader);
 void lower_named_interface_blocks(void *mem_ctx, gl_shader *shader);
diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp
index ed9ab47..7e6089d 100644
--- a/src/glsl/link_varyings.cpp
+++ b/src/glsl/link_varyings.cpp
@@ -1874,15 +1874,15 @@ assign_varying_locations(struct gl_context *ctx,
                                               ir_var_shader_in);
    }
 
-   if (!disable_varying_packing) {
-      if (producer) {
-         lower_packed_varyings(mem_ctx, slots_used, ir_var_shader_out,
-                               0, producer);
-      }
-      if (consumer) {
-         lower_packed_varyings(mem_ctx, slots_used, ir_var_shader_in,
-                               consumer_vertices, consumer);
-      }
+   if (producer) {
+      lower_packed_varyings(mem_ctx, slots_used, ir_var_shader_out,
+                            0, producer, disable_varying_packing);
+   }
+
+   if (consumer) {
+      lower_packed_varyings(mem_ctx, slots_used, ir_var_shader_in,
+                            consumer_vertices, consumer,
+                            disable_varying_packing);
    }
 
    return true;
diff --git a/src/glsl/lower_packed_varyings.cpp b/src/glsl/lower_packed_varyings.cpp
index 8d1eb17..d91aa22 100644
--- a/src/glsl/lower_packed_varyings.cpp
+++ b/src/glsl/lower_packed_varyings.cpp
@@ -168,7 +168,8 @@ public:
                                  ir_variable_mode mode,
                                  unsigned gs_input_vertices,
                                  exec_list *out_instructions,
-                                 exec_list *out_variables);
+                                 exec_list *out_variables,
+                                 bool disable_varying_packing);
 
    void run(struct gl_shader *shader);
 
@@ -231,6 +232,8 @@ private:
     * Exec list into which the visitor should insert any new variables.
     */
    exec_list *out_variables;
+
+   bool disable_varying_packing;
 };
 
 } /* anonymous namespace */
@@ -238,7 +241,7 @@ private:
 lower_packed_varyings_visitor::lower_packed_varyings_visitor(
       void *mem_ctx, unsigned locations_used, ir_variable_mode mode,
       unsigned gs_input_vertices, exec_list *out_instructions,
-      exec_list *out_variables)
+      exec_list *out_variables, bool disable_varying_packing)
    : mem_ctx(mem_ctx),
      locations_used(locations_used),
      packed_varyings((ir_variable **)
@@ -247,7 +250,8 @@ lower_packed_varyings_visitor::lower_packed_varyings_visitor(
      mode(mode),
      gs_input_vertices(gs_input_vertices),
      out_instructions(out_instructions),
-     out_variables(out_variables)
+     out_variables(out_variables),
+     disable_varying_packing(disable_varying_packing)
 {
 }
 
@@ -656,6 +660,9 @@ lower_packed_varyings_visitor::needs_lowering(ir_variable *var)
    if (var->data.explicit_location)
       return false;
 
+   if (disable_varying_packing)
+      return false;
+
    const glsl_type *type = var->type->without_array();
    if (type->vector_elements == 4 && !type->is_double())
       return false;
@@ -709,7 +716,7 @@ lower_packed_varyings_gs_splicer::visit_leave(ir_emit_vertex *ev)
 void
 lower_packed_varyings(void *mem_ctx, unsigned locations_used,
                       ir_variable_mode mode, unsigned gs_input_vertices,
-                      gl_shader *shader)
+                      gl_shader *shader, bool disable_varying_packing)
 {
    exec_list *instructions = shader->ir;
    ir_function *main_func = shader->symbols->get_function("main");
@@ -720,7 +727,8 @@ lower_packed_varyings(void *mem_ctx, unsigned locations_used,
    lower_packed_varyings_visitor visitor(mem_ctx, locations_used, mode,
                                          gs_input_vertices,
                                          &new_instructions,
-                                         &new_variables);
+                                         &new_variables,
+                                         disable_varying_packing);
    visitor.run(shader);
    if (mode == ir_var_shader_out) {
       if (shader->Stage == MESA_SHADER_GEOMETRY) {
-- 
2.4.3