1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
* Copyright © 2014 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_vertex_id.cpp
*
* There exists hardware, such as i965, that does not implement the OpenGL
* semantic for gl_VertexID. Instead, that hardware does not include the
* value of basevertex in the gl_VertexID value. To implement the OpenGL
* semantic, we'll have to convert gl_Vertex_ID to
* gl_VertexIDMESA+gl_BaseVertexMESA.
*/
#include "glsl_symbol_table.h"
#include "ir_hierarchical_visitor.h"
#include "ir.h"
#include "ir_builder.h"
#include "linker.h"
#include "program/prog_statevars.h"
namespace {
class lower_vertex_id_visitor : public ir_hierarchical_visitor {
public:
explicit lower_vertex_id_visitor(ir_function_signature *main_sig,
exec_list *ir_list)
: progress(false), VertexID(NULL), gl_VertexID(NULL),
gl_BaseVertex(NULL), main_sig(main_sig), ir_list(ir_list)
{
foreach_in_list(ir_instruction, ir, ir_list) {
ir_variable *const var = ir->as_variable();
if (var != NULL && var->data.mode == ir_var_system_value &&
var->data.location == SYSTEM_VALUE_BASE_VERTEX) {
gl_BaseVertex = var;
break;
}
}
}
virtual ir_visitor_status visit(ir_dereference_variable *);
bool progress;
private:
ir_variable *VertexID;
ir_variable *gl_VertexID;
ir_variable *gl_BaseVertex;
ir_function_signature *main_sig;
exec_list *ir_list;
};
} /* anonymous namespace */
ir_visitor_status
lower_vertex_id_visitor::visit(ir_dereference_variable *ir)
{
if (ir->var->data.mode != ir_var_system_value ||
ir->var->data.location != SYSTEM_VALUE_VERTEX_ID)
return visit_continue;
if (VertexID == NULL) {
const glsl_type *const int_t = glsl_type::int_type;
void *const mem_ctx = ralloc_parent(ir);
VertexID = new(mem_ctx) ir_variable(int_t, "__VertexID",
ir_var_temporary);
ir_list->push_head(VertexID);
gl_VertexID = new(mem_ctx) ir_variable(int_t, "gl_VertexIDMESA",
ir_var_system_value);
gl_VertexID->data.how_declared = ir_var_declared_implicitly;
gl_VertexID->data.read_only = true;
gl_VertexID->data.location = SYSTEM_VALUE_VERTEX_ID_ZERO_BASE;
gl_VertexID->data.explicit_location = true;
gl_VertexID->data.explicit_index = 0;
ir_list->push_head(gl_VertexID);
if (gl_BaseVertex == NULL) {
gl_BaseVertex = new(mem_ctx) ir_variable(int_t, "gl_BaseVertex",
ir_var_system_value);
gl_BaseVertex->data.how_declared = ir_var_declared_implicitly;
gl_BaseVertex->data.read_only = true;
gl_BaseVertex->data.location = SYSTEM_VALUE_BASE_VERTEX;
gl_BaseVertex->data.explicit_location = true;
gl_BaseVertex->data.explicit_index = 0;
ir_list->push_head(gl_BaseVertex);
}
ir_instruction *const inst =
ir_builder::assign(VertexID,
ir_builder::add(gl_VertexID, gl_BaseVertex));
main_sig->body.push_head(inst);
}
ir->var = VertexID;
progress = true;
return visit_continue;
}
bool
lower_vertex_id(gl_shader *shader)
{
/* gl_VertexID only exists in the vertex shader.
*/
if (shader->Stage != MESA_SHADER_VERTEX)
return false;
ir_function_signature *const main_sig =
link_get_main_function_signature(shader);
if (main_sig == NULL) {
assert(main_sig != NULL);
return false;
}
lower_vertex_id_visitor v(main_sig, shader->ir);
v.run(shader->ir);
return v.progress;
}
|
