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path: root/src/mesa/shader/slang/slang_assemble_assignment.c
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/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 2005-2006  Brian Paul   All Rights Reserved.
 *
 * 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 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
 * BRIAN PAUL 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 slang_assemble_assignment.c
 * slang assignment expressions assembler
 * \author Michal Krol
 */

#include "imports.h"
#include "slang_assemble.h"
#include "slang_storage.h"

/*
 * _slang_assemble_assignment()
 *
 * Copies values on the stack (<component 0> to <component N-1>) to a memory
 * location pointed by <addr of variable>.
 *
 * in:
 *      +------------------+
 *      | addr of variable |
 *      +------------------+
 *      | component N-1    |
 *      | ...              |
 *      | component 0      |
 *      +------------------+
 *
 * out:
 *      +------------------+
 *      | addr of variable |
 *      +------------------+
 */

static GLboolean
assign_basic (slang_assemble_ctx *A, slang_storage_type type, GLuint *index, GLuint size)
{
   GLuint dst_offset, dst_addr_loc;
   slang_assembly_type ty;

   /* Calculate the offset within destination variable to write. */
   if (A->swz.num_components != 0)
      dst_offset = A->swz.swizzle[*index / 4] * 4;
   else
      dst_offset = *index;

   switch (type) {
   case slang_stor_bool:
      ty = slang_asm_bool_copy;
      break;
   case slang_stor_int:
      ty = slang_asm_int_copy;
      break;
   case slang_stor_float:
      ty = slang_asm_float_copy;
      break;
#if defined(USE_X86_ASM) || defined(SLANG_X86)
   case slang_stor_vec4:
      ty = slang_asm_vec4_copy;
      break;
#endif
   default:
      _mesa_problem(NULL, "Unexpected arr->type in assign_basic");
      ty = slang_asm_none;
   }

  /* Calculate the distance from top of the stack to the destination address. As the
   * copy operation progresses, components of the source are being successively popped
   * off the stack by the amount of *index increase step.
   */
   dst_addr_loc = size - *index;

   if (!slang_assembly_file_push_label2 (A->file, ty, dst_addr_loc, dst_offset))
      return GL_FALSE;
   *index += _slang_sizeof_type (type);

   return GL_TRUE;
}

static GLboolean
assign_aggregate (slang_assemble_ctx *A, const slang_storage_aggregate *agg, GLuint *index,
                  GLuint size)
{
   GLuint i;

   for (i = 0; i < agg->count; i++) {
      const slang_storage_array *arr = &agg->arrays[i];
      GLuint j;

      for (j = 0; j < arr->length; j++) {
         if (arr->type == slang_stor_aggregate) {
            if (!assign_aggregate (A, arr->aggregate, index, size))
               return GL_FALSE;
         }
         else {
            /* When the destination is swizzled, we are forced to do float_copy, even if
             * vec4 extension is enabled with vec4_copy operation.
             */
            if (A->swz.num_components != 0 && arr->type == slang_stor_vec4) {
               if (!assign_basic (A, slang_stor_float, index, size))
                  return GL_FALSE;
               if (!assign_basic (A, slang_stor_float, index, size))
                  return GL_FALSE;
               if (!assign_basic (A, slang_stor_float, index, size))
                  return GL_FALSE;
               if (!assign_basic (A, slang_stor_float, index, size))
                  return GL_FALSE;
            }
            else {
               if (!assign_basic (A, arr->type, index, size))
                  return GL_FALSE;
            }
         }
      }
   }

   return GL_TRUE;
}

GLboolean _slang_assemble_assignment (slang_assemble_ctx *A, slang_operation *op)
{
	slang_assembly_typeinfo ti;
	GLboolean result = GL_FALSE;
	slang_storage_aggregate agg;
	GLuint index, size;

	if (!slang_assembly_typeinfo_construct (&ti))
		return GL_FALSE;
	if (!_slang_typeof_operation (A, op, &ti))
		goto end1;

	if (!slang_storage_aggregate_construct (&agg))
		goto end1;
	if (!_slang_aggregate_variable (&agg, &ti.spec, 0, A->space.funcs, A->space.structs,
			A->space.vars, A->mach, A->file, A->atoms))
		goto end;

	index = 0;
	size = _slang_sizeof_aggregate (&agg);
	result = assign_aggregate (A, &agg, &index, size);

end1:
	slang_storage_aggregate_destruct (&agg);
end:
	slang_assembly_typeinfo_destruct (&ti);
	return result;
}

/*
 * _slang_assemble_assign()
 *
 * Performs unary (pre ++ and --) or binary (=, +=, -=, *=, /=) assignment on the operation's
 * children.
 */

GLboolean _slang_assemble_assign (slang_assemble_ctx *A, slang_operation *op, const char *oper,
	slang_ref_type ref)
{
	slang_swizzle swz;

	if (ref == slang_ref_forbid)
	{
		if (!slang_assembly_file_push_label2 (A->file, slang_asm_local_addr, A->local.addr_tmp, 4))
			return GL_FALSE;
	}

	if (slang_string_compare ("=", oper) == 0)
	{
		if (!_slang_assemble_operation (A, &op->children[0], slang_ref_force))
			return GL_FALSE;
		swz = A->swz;
		if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
			return GL_FALSE;
		A->swz = swz;
		if (!_slang_assemble_assignment (A, op->children))
			return GL_FALSE;
	}
	else
	{
		if (!_slang_assemble_function_call_name (A, oper, op->children, op->num_children, GL_TRUE))
			return GL_FALSE;
	}

	if (ref == slang_ref_forbid)
	{
		if (!slang_assembly_file_push (A->file, slang_asm_addr_copy))
			return GL_FALSE;
		if (!slang_assembly_file_push_label (A->file, slang_asm_local_free, 4))
			return GL_FALSE;
		if (!_slang_dereference (A, op->children))
			return GL_FALSE;
	}

	return GL_TRUE;
}