1 /**************************************************************************
3 * Copyright 2011 Jose Fonseca
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
28 * Manipulation of GL extensions.
30 * So far we insert GREMEDY extensions, but in the future we could also clamp
31 * the GL extensions to core GL versions here.
42 #include "gltrace.hpp"
48 typedef std::map<std::string, const char *> ExtensionsMap;
50 // Cache of the translated extensions strings
51 static ExtensionsMap extensionsMap;
54 // Additional extensions to be advertised
55 static const char *extra_extensions[] = {
56 "GL_GREMEDY_string_marker",
57 "GL_GREMEDY_frame_terminator",
59 #define NUM_EXTRA_EXTENSIONS (sizeof(extra_extensions)/sizeof(extra_extensions[0]))
63 * Translate the GL extensions string, adding new extensions.
66 overrideExtensionsString(const char *extensions)
70 ExtensionsMap::const_iterator it = extensionsMap.find(extensions);
71 if (it != extensionsMap.end()) {
75 size_t extensions_len = strlen(extensions);
77 size_t extra_extensions_len = 0;
78 for (i = 0; i < NUM_EXTRA_EXTENSIONS; ++i) {
79 const char * extra_extension = extra_extensions[i];
80 size_t extra_extension_len = strlen(extra_extension);
81 extra_extensions_len += extra_extension_len + 1;
84 char *new_extensions = (char *)malloc(extensions_len + 1 + extra_extensions_len);
85 if (!new_extensions) {
90 memcpy(new_extensions, extensions, extensions_len);
92 // Add space separator if necessary
93 if (new_extensions[extensions_len - 1] != ' ') {
94 new_extensions[extensions_len++] = ' ';
98 for (i = 0; i < NUM_EXTRA_EXTENSIONS; ++i) {
99 const char * extra_extension = extra_extensions[i];
100 size_t extra_extension_len = strlen(extra_extension);
101 memcpy(new_extensions + extensions_len, extra_extension, extra_extension_len);
102 extensions_len += extra_extension_len;
103 new_extensions[extensions_len++] = ' ';
105 new_extensions[extensions_len] = '\0';
107 extensionsMap[extensions] = new_extensions;
109 return new_extensions;
114 __glGetString_override(GLenum name)
116 const GLubyte *result = __glGetString(name);
121 result = (const GLubyte *)overrideExtensionsString((const char *)result);
133 __glGetIntegerv_override(GLenum pname, GLint *params)
135 __glGetIntegerv(pname, params);
139 case GL_NUM_EXTENSIONS:
140 *params += NUM_EXTRA_EXTENSIONS;
150 __glGetStringi_override(GLenum name, GLuint index)
155 GLint num_extensions = 0;
156 __glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
157 if (num_extensions <= index && index < num_extensions + NUM_EXTRA_EXTENSIONS) {
158 return (const GLubyte *)extra_extensions[index - num_extensions];
166 return __glGetStringi(name, index);
170 } /* namespace gltrace */