diff options
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/Makefile | 1 | ||||
| -rw-r--r-- | src/glsl/ir_optimization.h | 1 | ||||
| -rw-r--r-- | src/glsl/lower_texture_projection.cpp | 100 |
3 files changed, 102 insertions, 0 deletions
diff --git a/src/glsl/Makefile b/src/glsl/Makefile index 47ac42667c7..83869b1d846 100644 --- a/src/glsl/Makefile +++ b/src/glsl/Makefile @@ -76,6 +76,7 @@ CXX_SOURCES = \ loop_controls.cpp \ loop_unroll.cpp \ lower_noise.cpp \ + lower_texture_projection.cpp \ lower_variable_index_to_cond_assign.cpp \ opt_redundant_jumps.cpp \ s_expression.cpp diff --git a/src/glsl/ir_optimization.h b/src/glsl/ir_optimization.h index 6a37e167fe5..ffdc66b9f75 100644 --- a/src/glsl/ir_optimization.h +++ b/src/glsl/ir_optimization.h @@ -44,6 +44,7 @@ bool do_div_to_mul_rcp(exec_list *instructions); bool do_explog_to_explog2(exec_list *instructions); bool do_function_inlining(exec_list *instructions); bool do_lower_jumps(exec_list *instructions, bool pull_out_jumps = true, bool lower_sub_return = true, bool lower_main_return = false, bool lower_continue = false, bool lower_break = false); +bool do_lower_texture_projection(exec_list *instructions); bool do_if_simplification(exec_list *instructions); bool do_if_to_cond_assign(exec_list *instructions); bool do_mat_op_to_vec(exec_list *instructions); diff --git a/src/glsl/lower_texture_projection.cpp b/src/glsl/lower_texture_projection.cpp new file mode 100644 index 00000000000..f82ca0a9fd9 --- /dev/null +++ b/src/glsl/lower_texture_projection.cpp @@ -0,0 +1,100 @@ +/* + * 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 <[email protected]> + */ + +#include "ir.h" +#include "ir_rvalue_visitor.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 = talloc_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; +} |