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/*
* Copyright © 2010 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 brw_cubemap_normalize.cpp
*
* IR lower pass to perform the normalization of the cubemap coordinates to
* have the largest magnitude component be -1.0 or 1.0.
*
* \author Eric Anholt <eric@anholt.net>
*/
#include "compiler/glsl_types.h"
#include "compiler/glsl/ir.h"
#include "program/prog_instruction.h" /* For WRITEMASK_* */
class brw_cubemap_normalize_visitor : public ir_hierarchical_visitor {
public:
brw_cubemap_normalize_visitor()
{
progress = false;
}
ir_visitor_status visit_leave(ir_texture *ir);
bool progress;
};
ir_visitor_status
brw_cubemap_normalize_visitor::visit_leave(ir_texture *ir)
{
if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_CUBE)
return visit_continue;
if (!ir->coordinate)
return visit_continue;
void *mem_ctx = ralloc_parent(ir);
ir_variable *var = new(mem_ctx) ir_variable(ir->coordinate->type,
"coordinate", ir_var_auto);
base_ir->insert_before(var);
ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var);
ir_assignment *assign = new(mem_ctx) ir_assignment(deref, ir->coordinate,
NULL);
base_ir->insert_before(assign);
deref = new(mem_ctx) ir_dereference_variable(var);
ir_rvalue *swiz0 = new(mem_ctx) ir_swizzle(deref, 0, 0, 0, 0, 1);
deref = new(mem_ctx) ir_dereference_variable(var);
ir_rvalue *swiz1 = new(mem_ctx) ir_swizzle(deref, 1, 0, 0, 0, 1);
deref = new(mem_ctx) ir_dereference_variable(var);
ir_rvalue *swiz2 = new(mem_ctx) ir_swizzle(deref, 2, 0, 0, 0, 1);
swiz0 = new(mem_ctx) ir_expression(ir_unop_abs, swiz0->type, swiz0, NULL);
swiz1 = new(mem_ctx) ir_expression(ir_unop_abs, swiz1->type, swiz1, NULL);
swiz2 = new(mem_ctx) ir_expression(ir_unop_abs, swiz2->type, swiz2, NULL);
ir_expression *expr;
expr = new(mem_ctx) ir_expression(ir_binop_max,
glsl_type::float_type,
swiz0, swiz1);
expr = new(mem_ctx) ir_expression(ir_binop_max,
glsl_type::float_type,
expr, swiz2);
expr = new(mem_ctx) ir_expression(ir_unop_rcp,
glsl_type::float_type,
expr, NULL);
/* coordinate.xyz *= expr */
assign = new(mem_ctx) ir_assignment(
new(mem_ctx) ir_dereference_variable(var),
new(mem_ctx) ir_swizzle(
new(mem_ctx) ir_expression(ir_binop_mul,
ir->coordinate->type,
new(mem_ctx) ir_dereference_variable(var),
expr),
0, 1, 2, 0, 3));
assign->write_mask = WRITEMASK_XYZ;
base_ir->insert_before(assign);
ir->coordinate = new(mem_ctx) ir_dereference_variable(var);
progress = true;
return visit_continue;
}
extern "C" {
bool
brw_do_cubemap_normalize(exec_list *instructions)
{
brw_cubemap_normalize_visitor v;
visit_list_elements(&v, instructions);
return v.progress;
}
}
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