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| 1901 | serge | 1 | /* |
| 2 | * Copyright © 2010 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * \file lower_texture_projection.cpp |
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| 26 | * |
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| 27 | * IR lower pass to perform the division of texture coordinates by the texture |
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| 28 | * projector if present. |
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| 29 | * |
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| 30 | * Many GPUs have a texture sampling opcode that takes the projector |
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| 31 | * and does the divide internally, thus the presence of the projector |
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| 32 | * in the IR. For GPUs that don't, this saves the driver needing the |
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| 33 | * logic for handling the divide. |
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| 34 | * |
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| 35 | * \author Eric Anholt |
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| 36 | */ |
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| 37 | |||
| 38 | #include "ir.h" |
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| 39 | |||
| 40 | class lower_texture_projection_visitor : public ir_hierarchical_visitor { |
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| 41 | public: |
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| 42 | lower_texture_projection_visitor() |
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| 43 | { |
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| 44 | progress = false; |
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| 45 | } |
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| 46 | |||
| 47 | ir_visitor_status visit_leave(ir_texture *ir); |
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| 48 | |||
| 49 | bool progress; |
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| 50 | }; |
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| 51 | |||
| 52 | ir_visitor_status |
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| 53 | lower_texture_projection_visitor::visit_leave(ir_texture *ir) |
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| 54 | { |
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| 55 | if (!ir->projector) |
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| 56 | return visit_continue; |
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| 57 | |||
| 58 | void *mem_ctx = ralloc_parent(ir); |
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| 59 | |||
| 60 | ir_variable *var = new(mem_ctx) ir_variable(ir->projector->type, |
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| 61 | "projector", ir_var_auto); |
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| 62 | base_ir->insert_before(var); |
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| 63 | ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); |
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| 64 | ir_expression *expr = new(mem_ctx) ir_expression(ir_unop_rcp, |
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| 65 | ir->projector->type, |
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| 66 | ir->projector, |
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| 67 | NULL); |
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| 68 | ir_assignment *assign = new(mem_ctx) ir_assignment(deref, expr, NULL); |
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| 69 | base_ir->insert_before(assign); |
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| 70 | |||
| 71 | deref = new(mem_ctx) ir_dereference_variable(var); |
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| 72 | ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, |
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| 73 | ir->coordinate->type, |
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| 74 | ir->coordinate, |
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| 75 | deref); |
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| 76 | |||
| 77 | if (ir->shadow_comparitor) { |
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| 78 | deref = new(mem_ctx) ir_dereference_variable(var); |
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| 79 | ir->shadow_comparitor = new(mem_ctx) ir_expression(ir_binop_mul, |
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| 80 | ir->shadow_comparitor->type, |
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| 81 | ir->shadow_comparitor, |
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| 82 | deref); |
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| 83 | } |
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| 84 | |||
| 85 | ir->projector = NULL; |
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| 86 | |||
| 87 | progress = true; |
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| 88 | return visit_continue; |
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| 89 | } |
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| 90 | |||
| 91 | bool |
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| 92 | do_lower_texture_projection(exec_list *instructions) |
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| 93 | { |
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| 94 | lower_texture_projection_visitor v; |
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| 95 | |||
| 96 | visit_list_elements(&v, instructions); |
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| 97 | |||
| 98 | return v.progress; |
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| 99 | } |