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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5564 | serge | 1 | /* |
| 2 | * Copyright © 2013 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_offset_array.cpp |
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| 26 | * |
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| 27 | * IR lower pass to decompose ir_texture ir_tg4 with an array of offsets |
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| 28 | * into four ir_tg4s with a single ivec2 offset, select the .w component of each, |
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| 29 | * and return those four values packed into a gvec4. |
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| 30 | * |
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| 31 | * \author Chris Forbes |
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| 32 | */ |
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| 33 | |||
| 34 | #include "glsl_types.h" |
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| 35 | #include "ir.h" |
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| 36 | #include "ir_builder.h" |
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| 37 | #include "ir_optimization.h" |
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| 38 | #include "ir_rvalue_visitor.h" |
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| 39 | |||
| 40 | using namespace ir_builder; |
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| 41 | |||
| 42 | class lower_offset_array_visitor : public ir_rvalue_visitor { |
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| 43 | public: |
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| 44 | lower_offset_array_visitor() |
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| 45 | { |
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| 46 | progress = false; |
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| 47 | } |
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| 48 | |||
| 49 | void handle_rvalue(ir_rvalue **rv); |
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| 50 | |||
| 51 | bool progress; |
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| 52 | }; |
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| 53 | |||
| 54 | void |
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| 55 | lower_offset_array_visitor::handle_rvalue(ir_rvalue **rv) |
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| 56 | { |
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| 57 | if (*rv == NULL || (*rv)->ir_type != ir_type_texture) |
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| 58 | return; |
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| 59 | |||
| 60 | ir_texture *ir = (ir_texture *) *rv; |
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| 61 | if (ir->op != ir_tg4 || !ir->offset || !ir->offset->type->is_array()) |
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| 62 | return; |
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| 63 | |||
| 64 | void *mem_ctx = ralloc_parent(ir); |
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| 65 | |||
| 66 | ir_variable *var = |
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| 67 | new (mem_ctx) ir_variable(ir->type, "result", ir_var_temporary); |
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| 68 | base_ir->insert_before(var); |
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| 69 | |||
| 70 | for (int i = 0; i < 4; i++) { |
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| 71 | ir_texture *tex = ir->clone(mem_ctx, NULL); |
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| 72 | tex->offset = new (mem_ctx) ir_dereference_array(tex->offset, |
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| 73 | new (mem_ctx) ir_constant(i)); |
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| 74 | |||
| 75 | base_ir->insert_before(assign(var, swizzle_w(tex), 1 << i)); |
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| 76 | } |
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| 77 | |||
| 78 | *rv = new (mem_ctx) ir_dereference_variable(var); |
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| 79 | |||
| 80 | progress = true; |
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| 81 | } |
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| 82 | |||
| 83 | bool |
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| 84 | lower_offset_arrays(exec_list *instructions) |
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| 85 | { |
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| 86 | lower_offset_array_visitor v; |
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| 87 | |||
| 88 | visit_list_elements(&v, instructions); |
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| 89 | |||
| 90 | return v.progress; |
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| 91 | } |