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/*

 * Copyright © 2009 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.

 */

/**

 * \file prog_parameter_layout.c

 * \brief Helper functions to layout storage for program parameters

 *

 * \author Ian Romanick 

 */

#include "main/compiler.h"

#include "main/mtypes.h"

#include "prog_parameter.h"

#include "prog_parameter_layout.h"

#include "prog_instruction.h"

#include "program_parser.h"

unsigned

_mesa_combine_swizzles(unsigned base, unsigned applied)

{

   unsigned swiz = 0;

   unsigned i;

   for (i = 0; i < 4; i++) {

      const unsigned s = GET_SWZ(applied, i);

      swiz |= ((s <= SWIZZLE_W) ? GET_SWZ(base, s) : s) << (i * 3);

   }

   return swiz;

}

/**

 * Copy indirect access array from one parameter list to another

 *

 * \param src   Parameter array copied from

 * \param dst   Parameter array copied to

 * \param first Index of first element in \c src to copy

 * \param count Number of elements to copy

 *

 * \return

 * The location in \c dst of the first element copied from \c src on

 * success.  -1 on failure.

 *

 * \warning

 * This function assumes that there is already enough space available in

 * \c dst to hold all of the elements that will be copied over.

 */

static int

copy_indirect_accessed_array(struct gl_program_parameter_list *src,

			     struct gl_program_parameter_list *dst,

			     unsigned first, unsigned count)

{

   const int base = dst->NumParameters;

   unsigned i, j;

   for (i = first; i < (first + count); i++) {

      struct gl_program_parameter *curr = & src->Parameters[i];

      if (curr->Type == PROGRAM_CONSTANT) {

	 j = dst->NumParameters;

      } else {

	 for (j = 0; j < dst->NumParameters; j++) {

	    if (memcmp(dst->Parameters[j].StateIndexes, curr->StateIndexes,

		       sizeof(curr->StateIndexes)) == 0) {

	       return -1;

	    }

	 }

      }

      assert(j == dst->NumParameters);

      /* copy src parameter [i] to dest parameter [j] */

      memcpy(& dst->Parameters[j], curr,

	     sizeof(dst->Parameters[j]));

      memcpy(dst->ParameterValues[j], src->ParameterValues[i],

	     sizeof(GLfloat) * 4);

      /* Pointer to the string name was copied.  Null-out src param name

       * to prevent double free later.

       */

      curr->Name = NULL;

      dst->NumParameters++;

   }

   return base;

}

/**

 * XXX description???

 * \return GL_TRUE for success, GL_FALSE for failure

 */

GLboolean

_mesa_layout_parameters(struct asm_parser_state *state)

{

   struct gl_program_parameter_list *layout;

   struct asm_instruction *inst;

   unsigned i;

   layout =

      _mesa_new_parameter_list_sized(state->prog->Parameters->NumParameters);

   /* PASS 1:  Move any parameters that are accessed indirectly from the

    * original parameter list to the new parameter list.

    */

   for (inst = state->inst_head; inst != NULL; inst = inst->next) {

      for (i = 0; i < 3; i++) {

	 if (inst->SrcReg[i].Base.RelAddr) {

	    /* Only attempt to add the to the new parameter list once.

	     */

	    if (!inst->SrcReg[i].Symbol->pass1_done) {

	       const int new_begin =

		  copy_indirect_accessed_array(state->prog->Parameters, layout,

		      inst->SrcReg[i].Symbol->param_binding_begin,

		      inst->SrcReg[i].Symbol->param_binding_length);

	       if (new_begin < 0) {

		  return GL_FALSE;

	       }

	       inst->SrcReg[i].Symbol->param_binding_begin = new_begin;

	       inst->SrcReg[i].Symbol->pass1_done = 1;

	    }

	    /* Previously the Index was just the offset from the parameter

	     * array.  Now that the base of the parameter array is known, the

	     * index can be updated to its actual value.

	     */

	    inst->Base.SrcReg[i] = inst->SrcReg[i].Base;

	    inst->Base.SrcReg[i].Index +=

	       inst->SrcReg[i].Symbol->param_binding_begin;

	 }

      }

   }

   /* PASS 2:  Move any parameters that are not accessed indirectly from the

    * original parameter list to the new parameter list.

    */

   for (inst = state->inst_head; inst != NULL; inst = inst->next) {

      for (i = 0; i < 3; i++) {

	 const struct gl_program_parameter *p;

	 const int idx = inst->SrcReg[i].Base.Index;

	 unsigned swizzle = SWIZZLE_NOOP;

	 /* All relative addressed operands were processed on the first

	  * pass.  Just skip them here.

	  */

	 if (inst->SrcReg[i].Base.RelAddr) {

	    continue;

	 }

	 if ((inst->SrcReg[i].Base.File <= PROGRAM_VARYING )

	     || (inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY)) {

	    continue;

	 }

	 inst->Base.SrcReg[i] = inst->SrcReg[i].Base;

	 p = & state->prog->Parameters->Parameters[idx];

	 switch (p->Type) {

	 case PROGRAM_CONSTANT: {

	    const float *const v =

	       state->prog->Parameters->ParameterValues[idx];

	    inst->Base.SrcReg[i].Index =

	       _mesa_add_unnamed_constant(layout, v, p->Size, & swizzle);

	    inst->Base.SrcReg[i].Swizzle =

	       _mesa_combine_swizzles(swizzle, inst->Base.SrcReg[i].Swizzle);

	    break;

	 }

	 case PROGRAM_STATE_VAR:

	    inst->Base.SrcReg[i].Index =

	       _mesa_add_state_reference(layout, p->StateIndexes);

	    break;

	 default:

	    break;

	 }

	 inst->SrcReg[i].Base.File = p->Type;

	 inst->Base.SrcReg[i].File = p->Type;

      }

   }

   _mesa_free_parameter_list(state->prog->Parameters);

   state->prog->Parameters = layout;

   return GL_TRUE;

}