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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5564 | serge | 1 | /* |
| 2 | * Copyright © 2014 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_vertex_id.cpp |
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| 26 | * |
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| 27 | * There exists hardware, such as i965, that does not implement the OpenGL |
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| 28 | * semantic for gl_VertexID. Instead, that hardware does not include the |
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| 29 | * value of basevertex in the gl_VertexID value. To implement the OpenGL |
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| 30 | * semantic, we'll have to convert gl_Vertex_ID to |
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| 31 | * gl_VertexIDMESA+gl_BaseVertexMESA. |
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| 32 | */ |
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| 33 | |||
| 34 | #include "glsl_symbol_table.h" |
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| 35 | #include "ir_hierarchical_visitor.h" |
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| 36 | #include "ir.h" |
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| 37 | #include "ir_builder.h" |
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| 38 | #include "linker.h" |
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| 39 | #include "program/prog_statevars.h" |
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| 40 | |||
| 41 | namespace { |
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| 42 | |||
| 43 | class lower_vertex_id_visitor : public ir_hierarchical_visitor { |
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| 44 | public: |
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| 45 | explicit lower_vertex_id_visitor(ir_function_signature *main_sig, |
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| 46 | exec_list *ir_list) |
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| 47 | : progress(false), VertexID(NULL), gl_VertexID(NULL), |
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| 48 | gl_BaseVertex(NULL), main_sig(main_sig), ir_list(ir_list) |
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| 49 | { |
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| 50 | foreach_in_list(ir_instruction, ir, ir_list) { |
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| 51 | ir_variable *const var = ir->as_variable(); |
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| 52 | |||
| 53 | if (var != NULL && var->data.mode == ir_var_system_value && |
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| 54 | var->data.location == SYSTEM_VALUE_BASE_VERTEX) { |
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| 55 | gl_BaseVertex = var; |
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| 56 | break; |
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| 57 | } |
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| 58 | } |
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| 59 | } |
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| 60 | |||
| 61 | virtual ir_visitor_status visit(ir_dereference_variable *); |
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| 62 | |||
| 63 | bool progress; |
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| 64 | |||
| 65 | private: |
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| 66 | ir_variable *VertexID; |
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| 67 | ir_variable *gl_VertexID; |
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| 68 | ir_variable *gl_BaseVertex; |
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| 69 | |||
| 70 | ir_function_signature *main_sig; |
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| 71 | exec_list *ir_list; |
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| 72 | }; |
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| 73 | |||
| 74 | } /* anonymous namespace */ |
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| 75 | |||
| 76 | ir_visitor_status |
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| 77 | lower_vertex_id_visitor::visit(ir_dereference_variable *ir) |
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| 78 | { |
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| 79 | if (ir->var->data.mode != ir_var_system_value || |
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| 80 | ir->var->data.location != SYSTEM_VALUE_VERTEX_ID) |
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| 81 | return visit_continue; |
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| 82 | |||
| 83 | if (VertexID == NULL) { |
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| 84 | const glsl_type *const int_t = glsl_type::int_type; |
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| 85 | void *const mem_ctx = ralloc_parent(ir); |
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| 86 | |||
| 87 | VertexID = new(mem_ctx) ir_variable(int_t, "__VertexID", |
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| 88 | ir_var_temporary); |
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| 89 | ir_list->push_head(VertexID); |
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| 90 | |||
| 91 | gl_VertexID = new(mem_ctx) ir_variable(int_t, "gl_VertexIDMESA", |
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| 92 | ir_var_system_value); |
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| 93 | gl_VertexID->data.how_declared = ir_var_declared_implicitly; |
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| 94 | gl_VertexID->data.read_only = true; |
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| 95 | gl_VertexID->data.location = SYSTEM_VALUE_VERTEX_ID_ZERO_BASE; |
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| 96 | gl_VertexID->data.explicit_location = true; |
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| 97 | gl_VertexID->data.explicit_index = 0; |
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| 98 | ir_list->push_head(gl_VertexID); |
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| 99 | |||
| 100 | if (gl_BaseVertex == NULL) { |
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| 101 | gl_BaseVertex = new(mem_ctx) ir_variable(int_t, "gl_BaseVertex", |
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| 102 | ir_var_system_value); |
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| 103 | gl_BaseVertex->data.how_declared = ir_var_declared_implicitly; |
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| 104 | gl_BaseVertex->data.read_only = true; |
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| 105 | gl_BaseVertex->data.location = SYSTEM_VALUE_BASE_VERTEX; |
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| 106 | gl_BaseVertex->data.explicit_location = true; |
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| 107 | gl_BaseVertex->data.explicit_index = 0; |
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| 108 | ir_list->push_head(gl_BaseVertex); |
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| 109 | } |
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| 110 | |||
| 111 | ir_instruction *const inst = |
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| 112 | ir_builder::assign(VertexID, |
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| 113 | ir_builder::add(gl_VertexID, gl_BaseVertex)); |
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| 114 | |||
| 115 | main_sig->body.push_head(inst); |
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| 116 | } |
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| 117 | |||
| 118 | ir->var = VertexID; |
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| 119 | progress = true; |
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| 120 | |||
| 121 | return visit_continue; |
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| 122 | } |
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| 123 | |||
| 124 | bool |
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| 125 | lower_vertex_id(gl_shader *shader) |
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| 126 | { |
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| 127 | /* gl_VertexID only exists in the vertex shader. |
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| 128 | */ |
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| 129 | if (shader->Stage != MESA_SHADER_VERTEX) |
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| 130 | return false; |
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| 131 | |||
| 132 | ir_function_signature *const main_sig = |
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| 133 | link_get_main_function_signature(shader); |
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| 134 | if (main_sig == NULL) { |
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| 135 | assert(main_sig != NULL); |
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| 136 | return false; |
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| 137 | } |
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| 138 | |||
| 139 | lower_vertex_id_visitor v(main_sig, shader->ir); |
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| 140 | |||
| 141 | v.run(shader->ir); |
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| 142 | |||
| 143 | return v.progress; |
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| 144 | } |