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/*

 * Copyright © 2013 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 */

#include "link_uniform_block_active_visitor.h"

#include "program.h"

link_uniform_block_active *

process_block(void *mem_ctx, struct hash_table *ht, ir_variable *var)

{

   const hash_entry *const existing_block =

      _mesa_hash_table_search(ht, var->get_interface_type()->name);

   const glsl_type *const block_type = var->is_interface_instance()

      ? var->type : var->get_interface_type();

   /* If a block with this block-name has not previously been seen, add it.

    * If a block with this block-name has been seen, it must be identical to

    * the block currently being examined.

    */

   if (existing_block == NULL) {

      link_uniform_block_active *const b =

	 rzalloc(mem_ctx, struct link_uniform_block_active);

      b->type = block_type;

      b->has_instance_name = var->is_interface_instance();

      if (var->data.explicit_binding) {

         b->has_binding = true;

         b->binding = var->data.binding;

      } else {

         b->has_binding = false;

         b->binding = 0;

      }

      _mesa_hash_table_insert(ht, var->get_interface_type()->name, (void *) b);

      return b;

   } else {

      link_uniform_block_active *const b =

	 (link_uniform_block_active *) existing_block->data;

      if (b->type != block_type

	  || b->has_instance_name != var->is_interface_instance())

	 return NULL;

      else

	 return b;

   }

   assert(!"Should not get here.");

   return NULL;

}

ir_visitor_status

link_uniform_block_active_visitor::visit(ir_variable *var)

{

   if (!var->is_in_uniform_block())

      return visit_continue;

   const glsl_type *const block_type = var->is_interface_instance()

      ? var->type : var->get_interface_type();

   /* Section 2.11.6 (Uniform Variables) of the OpenGL ES 3.0.3 spec says:

    *

    *     "All members of a named uniform block declared with a shared or

    *     std140 layout qualifier are considered active, even if they are not

    *     referenced in any shader in the program. The uniform block itself is

    *     also considered active, even if no member of the block is

    *     referenced."

    */

   if (block_type->interface_packing == GLSL_INTERFACE_PACKING_PACKED)

      return visit_continue;

   /* Process the block.  Bail if there was an error.

    */

   link_uniform_block_active *const b =

      process_block(this->mem_ctx, this->ht, var);

   if (b == NULL) {

      linker_error(this->prog,

                   "uniform block `%s' has mismatching definitions",

                   var->get_interface_type()->name);

      this->success = false;

      return visit_stop;

   }

   assert(b->num_array_elements == 0);

   assert(b->array_elements == NULL);

   assert(b->type != NULL);

   return visit_continue;

}

ir_visitor_status

link_uniform_block_active_visitor::visit_enter(ir_dereference_array *ir)

{

   ir_dereference_variable *const d = ir->array->as_dereference_variable();

   ir_variable *const var = (d == NULL) ? NULL : d->var;

   /* If the r-value being dereferenced is not a variable (e.g., a field of a

    * structure) or is not a uniform block instance, continue.

    *

    * WARNING: It is not enough for the variable to be part of uniform block.

    * It must represent the entire block.  Arrays (or matrices) inside blocks

    * that lack an instance name are handled by the ir_dereference_variable

    * function.

    */

   if (var == NULL

       || !var->is_in_uniform_block()

       || !var->is_interface_instance())

      return visit_continue;

   /* Process the block.  Bail if there was an error.

    */

   link_uniform_block_active *const b =

      process_block(this->mem_ctx, this->ht, var);

   if (b == NULL) {

      linker_error(prog,

		   "uniform block `%s' has mismatching definitions",

		   var->get_interface_type()->name);

      this->success = false;

      return visit_stop;

   }

   /* Block arrays must be declared with an instance name.

    */

   assert(b->has_instance_name);

   assert((b->num_array_elements == 0) == (b->array_elements == NULL));

   assert(b->type != NULL);

   ir_constant *c = ir->array_index->as_constant();

   if (c) {

      /* Index is a constant, so mark just that element used, if not already */

      const unsigned idx = c->get_uint_component(0);

      unsigned i;

      for (i = 0; i < b->num_array_elements; i++) {

         if (b->array_elements[i] == idx)

            break;

      }

      assert(i <= b->num_array_elements);

      if (i == b->num_array_elements) {

         b->array_elements = reralloc(this->mem_ctx,

                                      b->array_elements,

                                      unsigned,

                                      b->num_array_elements + 1);

         b->array_elements[b->num_array_elements] = idx;

         b->num_array_elements++;

      }

   } else {

      /* The array index is not a constant, so mark the entire array used. */

      assert(b->type->is_array());

      if (b->num_array_elements < b->type->length) {

         b->num_array_elements = b->type->length;

         b->array_elements = reralloc(this->mem_ctx,

                                      b->array_elements,

                                      unsigned,

                                      b->num_array_elements);

         for (unsigned i = 0; i < b->num_array_elements; i++) {

            b->array_elements[i] = i;

         }

      }

   }

   return visit_continue_with_parent;

}

ir_visitor_status

link_uniform_block_active_visitor::visit(ir_dereference_variable *ir)

{

   ir_variable *var = ir->var;

   if (!var->is_in_uniform_block())

      return visit_continue;

   assert(!var->is_interface_instance() || !var->type->is_array());

   /* Process the block.  Bail if there was an error.

    */

   link_uniform_block_active *const b =

      process_block(this->mem_ctx, this->ht, var);

   if (b == NULL) {

      linker_error(this->prog,

		   "uniform block `%s' has mismatching definitions",

		   var->get_interface_type()->name);

      this->success = false;

      return visit_stop;

   }

   assert(b->num_array_elements == 0);

   assert(b->array_elements == NULL);

   assert(b->type != NULL);

   return visit_continue;

}