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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;
}
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