| /* |
| * 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 lower_texture_projection.cpp |
| * |
| * IR lower pass to perform the division of texture coordinates by the texture |
| * projector if present. |
| * |
| * Many GPUs have a texture sampling opcode that takes the projector |
| * and does the divide internally, thus the presence of the projector |
| * in the IR. For GPUs that don't, this saves the driver needing the |
| * logic for handling the divide. |
| * |
| * \author Eric Anholt <eric@anholt.net> |
| */ |
| |
| #include "ir.h" |
| |
| namespace { |
| |
| class lower_texture_projection_visitor : public ir_hierarchical_visitor { |
| public: |
| lower_texture_projection_visitor() |
| { |
| progress = false; |
| } |
| |
| ir_visitor_status visit_leave(ir_texture *ir); |
| |
| bool progress; |
| }; |
| |
| } /* anonymous namespace */ |
| |
| ir_visitor_status |
| lower_texture_projection_visitor::visit_leave(ir_texture *ir) |
| { |
| if (!ir->projector) |
| return visit_continue; |
| |
| void *mem_ctx = ralloc_parent(ir); |
| |
| ir_variable *var = new(mem_ctx) ir_variable(ir->projector->type, |
| "projector", ir_var_temporary); |
| base_ir->insert_before(var); |
| ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); |
| ir_expression *expr = new(mem_ctx) ir_expression(ir_unop_rcp, |
| ir->projector->type, |
| ir->projector, |
| NULL); |
| ir_assignment *assign = new(mem_ctx) ir_assignment(deref, expr, NULL); |
| base_ir->insert_before(assign); |
| |
| deref = new(mem_ctx) ir_dereference_variable(var); |
| ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, |
| ir->coordinate->type, |
| ir->coordinate, |
| deref); |
| |
| if (ir->shadow_comparitor) { |
| deref = new(mem_ctx) ir_dereference_variable(var); |
| ir->shadow_comparitor = new(mem_ctx) ir_expression(ir_binop_mul, |
| ir->shadow_comparitor->type, |
| ir->shadow_comparitor, |
| deref); |
| } |
| |
| ir->projector = NULL; |
| |
| progress = true; |
| return visit_continue; |
| } |
| |
| bool |
| do_lower_texture_projection(exec_list *instructions) |
| { |
| lower_texture_projection_visitor v; |
| |
| visit_list_elements(&v, instructions); |
| |
| return v.progress; |
| } |