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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/**************************************************************************
*
* Copyright 2014 VMware, Inc.
* All Rights Reserved.
*
* 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 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.
*
**************************************************************************/
#include "glprofile.hpp"
#include <assert.h>
#include "os.hpp"
#include "glproc.hpp"
namespace glprofile {
std::ostream &
operator << (std::ostream &os, const Profile & profile) {
os << "OpenGL";
if (profile.api == API_GLES) {
os << " ES";
}
os << " " << profile.major << "." << profile.minor;
if (profile.api == API_GL &&
profile.versionGreaterOrEqual(3, 2)) {
os << " " << (profile.core ? "core" : "compat");
}
return os;
}
static inline bool
isDigit(char c) {
return c >= '0' && c <= '9';
}
static unsigned
parseNumber(const char * & p)
{
unsigned n = 0;
char c = *p;
while (isDigit(c)) {
unsigned digit = c - '0';
n *= 10;
n += digit;
++p;
c = *p;
}
return n;
}
/*
* Parse API and version numbers from a GL_VERSION string.
*
* OpenGL 2.1 specification states that GL_VERSION string is laid out as
*
* <version number><space><vendor-specific information>
*
* Where <version number> is either of the form <major number>.<minor number>
* or <major number>.<minor number>.<release number>, where the numbers all
* have one or more digits. The release number and vendor specific
* information are optional.
*
* OpenGL ES 1.x specification states that GL_VERSION is laid out as
*
* "OpenGL ES-XX 1.x" XX={CM,CL}
*
* OpenGL ES 2 and 3 specifications state that GL_VERSION is laid out as
*
* "OpenGL ES N.M vendor-specific information"
*/
static Profile
parseVersion(const char *version)
{
Profile profile(API_GL, 0, 0, false);
const char *p = version;
if (p[0] == 'O' &&
p[1] == 'p' &&
p[2] == 'e' &&
p[3] == 'n' &&
p[4] == 'G' &&
p[5] == 'L' &&
p[6] == ' ' &&
p[7] == 'E' &&
p[8] == 'S') {
p += 9;
profile.api = API_GLES;
// skip `-{CM,CL}`
if (*p == '-') {
++p;
while (*p != ' ') {
if (*p == '\0') {
goto malformed;
}
++p;
}
}
// skip white-space
while (*p == ' ') {
if (*p == '\0') {
goto malformed;
}
++p;
}
}
if (!isDigit(*p)) {
goto malformed;
}
profile.major = parseNumber(p);
if (*p++ == '.' &&
isDigit(*p)) {
profile.minor = parseNumber(p);
} else {
goto malformed;
}
return profile;
malformed:
os::log("warning: malformed GL_VERSION (\"%s\")\n", version);
return profile;
}
/*
* Get the profile of the current context.
*/
Profile
getCurrentContextProfile(void)
{
Profile profile(API_GL, 0, 0, false);
assert(parseVersion("3.0 Mesa 10.3.2") == Profile(API_GL, 3, 0));
assert(parseVersion("3.3 (Core Profile) Mesa 10.3.2") == Profile(API_GL, 3, 3));
assert(parseVersion("4.4.0 NVIDIA 331.89") == Profile(API_GL, 4, 4));
assert(parseVersion("OpenGL ES 3.0 Mesa 10.3.2") == Profile(API_GLES, 3, 0));
const char *version = (const char *)_glGetString(GL_VERSION);
if (!version) {
os::log("warning: null GL_VERSION\n");
return profile;
}
// Parse the version string.
profile = parseVersion(version);
if (profile.major >= 3) {
/*
* From OpenGL and OpenGL ES version 3 onwards, the GL version may also
* be queried via GL_MAJOR VERSION and GL_MINOR_VERSION, which should
* match the major number and minor number in GL_VERSION string, so use
* it to check we parsed the versions correcly.
*/
GLint majorVersion = 0;
_glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
GLint minorVersion = 0;
_glGetIntegerv(GL_MINOR_VERSION, &minorVersion);
if (majorVersion != profile.major ||
minorVersion != profile.minor) {
os::log("apitrace: warning: OpenGL context version mismatch (GL_VERSION=\"%s\", but GL_MAJOR/MINOR_VERSION=%u.%u)\n",
version, majorVersion, minorVersion);
}
}
if (profile.api == API_GL &&
profile.versionGreaterOrEqual(3, 2)) {
GLint profileMask = 0;
_glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &profileMask);
if (profileMask & GL_CONTEXT_CORE_PROFILE_BIT) {
profile.core = true;
}
}
return profile;
}
} /* namespace glprofile */
|
