6d1765c63a
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file lower_texture_projection.cpp
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*
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* IR lower pass to perform the division of texture coordinates by the texture
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* projector if present.
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*
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* Many GPUs have a texture sampling opcode that takes the projector
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* and does the divide internally, thus the presence of the projector
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* in the IR. For GPUs that don't, this saves the driver needing the
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* logic for handling the divide.
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*
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* \author Eric Anholt <eric@anholt.net>
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*/
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#include "ir.h"
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namespace {
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class lower_texture_projection_visitor : public ir_hierarchical_visitor {
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public:
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lower_texture_projection_visitor()
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{
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progress = false;
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}
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ir_visitor_status visit_leave(ir_texture *ir);
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bool progress;
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};
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} /* anonymous namespace */
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ir_visitor_status
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lower_texture_projection_visitor::visit_leave(ir_texture *ir)
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{
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if (!ir->projector)
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return visit_continue;
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void *mem_ctx = ralloc_parent(ir);
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ir_variable *var = new(mem_ctx) ir_variable(ir->projector->type,
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"projector", ir_var_temporary);
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base_ir->insert_before(var);
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ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var);
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ir_expression *expr = new(mem_ctx) ir_expression(ir_unop_rcp,
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ir->projector->type,
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ir->projector,
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NULL);
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ir_assignment *assign = new(mem_ctx) ir_assignment(deref, expr);
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base_ir->insert_before(assign);
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deref = new(mem_ctx) ir_dereference_variable(var);
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ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul,
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ir->coordinate->type,
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ir->coordinate,
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deref);
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if (ir->shadow_comparator) {
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deref = new(mem_ctx) ir_dereference_variable(var);
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ir->shadow_comparator = new(mem_ctx) ir_expression(ir_binop_mul,
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ir->shadow_comparator->type,
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ir->shadow_comparator,
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deref);
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}
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ir->projector = NULL;
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progress = true;
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return visit_continue;
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}
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bool
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do_lower_texture_projection(exec_list *instructions)
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{
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lower_texture_projection_visitor v;
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visit_list_elements(&v, instructions);
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return v.progress;
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}
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