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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.
*/
/**
* \file lower_offset_array.cpp
*
* IR lower pass to decompose ir_texture ir_tg4 with an array of offsets
* into four ir_tg4s with a single ivec2 offset, select the .w component of each,
* and return those four values packed into a gvec4.
*
* \author Chris Forbes <chrisf@ijw.co.nz>
*/
#include "glsl_types.h"
#include "ir.h"
#include "ir_builder.h"
#include "ir_optimization.h"
#include "ir_rvalue_visitor.h"
using namespace ir_builder;
class lower_offset_array_visitor : public ir_rvalue_visitor {
public:
lower_offset_array_visitor()
{
progress = false;
}
void handle_rvalue(ir_rvalue **rv);
bool progress;
};
void
lower_offset_array_visitor::handle_rvalue(ir_rvalue **rv)
{
if (*rv == NULL || (*rv)->ir_type != ir_type_texture)
return;
ir_texture *ir = (ir_texture *) *rv;
if (ir->op != ir_tg4 || !ir->offset || !ir->offset->type->is_array())
return;
void *mem_ctx = ralloc_parent(ir);
ir_variable *var =
new (mem_ctx) ir_variable(ir->type, "result", ir_var_temporary);
base_ir->insert_before(var);
for (int i = 0; i < 4; i++) {
ir_texture *tex = ir->clone(mem_ctx, NULL);
tex->offset = new (mem_ctx) ir_dereference_array(tex->offset,
new (mem_ctx) ir_constant(i));
base_ir->insert_before(assign(var, swizzle_w(tex), 1 << i));
}
*rv = new (mem_ctx) ir_dereference_variable(var);
progress = true;
}
bool
lower_offset_arrays(exec_list *instructions)
{
lower_offset_array_visitor v;
visit_list_elements(&v, instructions);
return v.progress;
}
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