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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 

#include "main/compiler.h"

#include "main/mtypes.h"

#include "main/macros.h"

#include "util/ralloc.h"

#include "ir.h"

#include "program/hash_table.h"

/**

 * \file varyings_test.cpp

 *

 * Test various aspects of linking shader stage inputs and outputs.

 */

namespace linker {

bool

populate_consumer_input_sets(void *mem_ctx, exec_list *ir,

                             hash_table *consumer_inputs,

                             hash_table *consumer_interface_inputs,

                             ir_variable *consumer_inputs_with_locations[VARYING_SLOT_MAX]);

ir_variable *

get_matching_input(void *mem_ctx,

                   const ir_variable *output_var,

                   hash_table *consumer_inputs,

                   hash_table *consumer_interface_inputs,

                   ir_variable *consumer_inputs_with_locations[VARYING_SLOT_MAX]);

}

class link_varyings : public ::testing::Test {

public:

   link_varyings();

   virtual void SetUp();

   virtual void TearDown();

   char *interface_field_name(const glsl_type *iface, unsigned field = 0)

   {

      return ralloc_asprintf(mem_ctx,

                             "%s.%s",

                             iface->name,

                             iface->fields.structure[field].name);

   }

   void *mem_ctx;

   exec_list ir;

   hash_table *consumer_inputs;

   hash_table *consumer_interface_inputs;

   const glsl_type *simple_interface;

   ir_variable *junk[VARYING_SLOT_MAX];

};

link_varyings::link_varyings()

{

   static const glsl_struct_field f[] = {

      {

         glsl_type::vec(4),

         "v",

         false,

         0,

         0,

         0,

      }

   };

   this->simple_interface =

      glsl_type::get_interface_instance(f,

                                        ARRAY_SIZE(f),

                                        GLSL_INTERFACE_PACKING_STD140,

                                        "simple_interface");

}

void

link_varyings::SetUp()

{

   this->mem_ctx = ralloc_context(NULL);

   this->ir.make_empty();

   this->consumer_inputs

      = hash_table_ctor(0, hash_table_string_hash, hash_table_string_compare);

   this->consumer_interface_inputs

      = hash_table_ctor(0, hash_table_string_hash, hash_table_string_compare);

}

void

link_varyings::TearDown()

{

   ralloc_free(this->mem_ctx);

   this->mem_ctx = NULL;

   hash_table_dtor(this->consumer_inputs);

   this->consumer_inputs = NULL;

   hash_table_dtor(this->consumer_interface_inputs);

   this->consumer_interface_inputs = NULL;

}

/**

 * Hash table callback function that counts the elements in the table

 *

 * \sa num_elements

 */

static void

ht_count_callback(const void *, void *, void *closure)

{

   unsigned int *counter = (unsigned int *) closure;

   (*counter)++;

}

/**

 * Helper function to count the number of elements in a hash table.

 */

static unsigned

num_elements(hash_table *ht)

{

   unsigned int counter = 0;

   hash_table_call_foreach(ht, ht_count_callback, (void *) &counter);

   return counter;

}

/**

 * Helper function to determine whether a hash table is empty.

 */

static bool

is_empty(hash_table *ht)

{

   return num_elements(ht) == 0;

}

TEST_F(link_varyings, single_simple_input)

{

   ir_variable *const v =

      new(mem_ctx) ir_variable(glsl_type::vec(4),

                               "a",

                               ir_var_shader_in);

   ir.push_tail(v);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   EXPECT_EQ((void *) v, hash_table_find(consumer_inputs, "a"));

   EXPECT_EQ(1u, num_elements(consumer_inputs));

   EXPECT_TRUE(is_empty(consumer_interface_inputs));

}

TEST_F(link_varyings, gl_ClipDistance)

{

   const glsl_type *const array_8_of_float =

      glsl_type::get_array_instance(glsl_type::vec(1), 8);

   ir_variable *const clipdistance =

      new(mem_ctx) ir_variable(array_8_of_float,

                               "gl_ClipDistance",

                               ir_var_shader_in);

   clipdistance->data.explicit_location = true;

   clipdistance->data.location = VARYING_SLOT_CLIP_DIST0;

   clipdistance->data.explicit_index = 0;

   ir.push_tail(clipdistance);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   EXPECT_EQ(clipdistance, junk[VARYING_SLOT_CLIP_DIST0]);

   EXPECT_TRUE(is_empty(consumer_inputs));

   EXPECT_TRUE(is_empty(consumer_interface_inputs));

}

TEST_F(link_varyings, single_interface_input)

{

   ir_variable *const v =

      new(mem_ctx) ir_variable(simple_interface->fields.structure[0].type,

                               simple_interface->fields.structure[0].name,

                               ir_var_shader_in);

   v->init_interface_type(simple_interface);

   ir.push_tail(v);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   char *const full_name = interface_field_name(simple_interface);

   EXPECT_EQ((void *) v, hash_table_find(consumer_interface_inputs, full_name));

   EXPECT_EQ(1u, num_elements(consumer_interface_inputs));

   EXPECT_TRUE(is_empty(consumer_inputs));

}

TEST_F(link_varyings, one_interface_and_one_simple_input)

{

   ir_variable *const v =

      new(mem_ctx) ir_variable(glsl_type::vec(4),

                               "a",

                               ir_var_shader_in);

   ir.push_tail(v);

   ir_variable *const iface =

      new(mem_ctx) ir_variable(simple_interface->fields.structure[0].type,

                               simple_interface->fields.structure[0].name,

                               ir_var_shader_in);

   iface->init_interface_type(simple_interface);

   ir.push_tail(iface);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   char *const iface_field_name = interface_field_name(simple_interface);

   EXPECT_EQ((void *) iface, hash_table_find(consumer_interface_inputs,

                                             iface_field_name));

   EXPECT_EQ(1u, num_elements(consumer_interface_inputs));

   EXPECT_EQ((void *) v, hash_table_find(consumer_inputs, "a"));

   EXPECT_EQ(1u, num_elements(consumer_inputs));

}

TEST_F(link_varyings, invalid_interface_input)

{

   ir_variable *const v =

      new(mem_ctx) ir_variable(simple_interface,

                               "named_interface",

                               ir_var_shader_in);

   ASSERT_EQ(simple_interface, v->get_interface_type());

   ir.push_tail(v);

   EXPECT_FALSE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                     consumer_interface_inputs,

                                                     junk));

}

TEST_F(link_varyings, interface_field_doesnt_match_noninterface)

{

   char *const iface_field_name = interface_field_name(simple_interface);

   /* The input shader has a single input variable name "a.v"

    */

   ir_variable *const in_v =

      new(mem_ctx) ir_variable(glsl_type::vec(4),

                               iface_field_name,

                               ir_var_shader_in);

   ir.push_tail(in_v);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   /* Create an output variable, "v", that is part of an interface block named

    * "a".  They should not match.

    */

   ir_variable *const out_v =

      new(mem_ctx) ir_variable(simple_interface->fields.structure[0].type,

                               simple_interface->fields.structure[0].name,

                               ir_var_shader_in);

   out_v->init_interface_type(simple_interface);

   ir_variable *const match =

      linker::get_matching_input(mem_ctx,

                                 out_v,

                                 consumer_inputs,

                                 consumer_interface_inputs,

                                 junk);

   EXPECT_EQ(NULL, match);

}

TEST_F(link_varyings, interface_field_doesnt_match_noninterface_vice_versa)

{

   char *const iface_field_name = interface_field_name(simple_interface);

   /* In input shader has a single variable, "v", that is part of an interface

    * block named "a".

    */

   ir_variable *const in_v =

      new(mem_ctx) ir_variable(simple_interface->fields.structure[0].type,

                               simple_interface->fields.structure[0].name,

                               ir_var_shader_in);

   in_v->init_interface_type(simple_interface);

   ir.push_tail(in_v);

   ASSERT_TRUE(linker::populate_consumer_input_sets(mem_ctx,

                                                    &ir,

                                                    consumer_inputs,

                                                    consumer_interface_inputs,

                                                    junk));

   /* Create an output variable "a.v".  They should not match.

    */

   ir_variable *const out_v =

      new(mem_ctx) ir_variable(glsl_type::vec(4),

                               iface_field_name,

                               ir_var_shader_out);

   ir_variable *const match =

      linker::get_matching_input(mem_ctx,

                                 out_v,

                                 consumer_inputs,

                                 consumer_interface_inputs,

                                 junk);

   EXPECT_EQ(NULL, match);

}