0,0 → 1,99 |
/* |
* 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" |
|
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; |
}; |
|
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_auto); |
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; |
} |