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Side by Side Diff: src/gpu/gl/GrGLExtensions.cpp

Issue 12328111: Use glGetStringi to get extensions when available. (Closed) Base URL: http://skia.googlecode.com/svn/trunk/
Patch Set: Created 7 years, 10 months ago
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1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gl/GrGLExtensions.h"
9 #include "gl/GrGLDefines.h"
10 #include "gl/GrGLUtil.h"
11
12 bool GrGLExtensions::init(GrGLBinding binding,
13 GrGLGetStringProc getString,
14 GrGLGetStringiProc getStringi,
15 GrGLGetIntegervProc getIntegerv) {
16 fStrings.reset();
17 if (NULL == getString) {
18 return false;
19 }
20 bool indexed = false;
21 if (kDesktop_GrGLBinding == binding) {
22 const GrGLubyte* verString = getString(GR_GL_VERSION);
23 if (NULL == verString) {
24 return false;
25 }
26 GrGLVersion version = GrGLGetVersionFromString((const char*) verString);
27 indexed = version >= GR_GL_VER(3, 0);
28 }
29 if (indexed) {
30 if (NULL == getStringi || NULL == getIntegerv) {
31 return false;
32 }
33 GrGLint extensionCnt = 0;
34 getIntegerv(GR_GL_NUM_EXTENSIONS, &extensionCnt);
35 fStrings.push_back_n(extensionCnt);
36 for (int i = 0; i < extensionCnt; ++i) {
37 const char* ext = (const char*) getStringi(GR_GL_EXTENSIONS, i);
38 fStrings[i] = ext;
39 }
40 } else {
41 const char* extensions = (const char*) getString(GR_GL_EXTENSIONS);
42 if (NULL == extensions) {
43 return false;
44 }
45 // First count the extensions so that we don't cause the array to malloc multiple times.
46 int extensionCnt = 1;
47 const char* e = (const char*) extensions;
48 while (NULL != (e = strchr(e+1, ' '))) {
49 e += 1;
50 ++extensionCnt;
51 }
52 fStrings.push_back_n(extensionCnt);
53
54 int i = 0;
55 while (true) {
56 size_t length = strcspn(extensions, " ");
57 GrAssert(i < extensionCnt);
58 fStrings[i].set(extensions, length);
59 ++i;
60 if ('\0' == extensions[length]) {
61 break;
62 }
63 extensions += length + 1;
64 }
65 GrAssert(i == extensionCnt);
66 }
67 return true;
68 }
69
70 bool GrGLExtensions::has(const char* ext) const {
71 // TODO: Sort the extensions and binary search.
72 int count = fStrings.count();
73 for (int i = 0; i < count; ++i) {
74 if (fStrings[i].equals(ext)) {
75 return true;
76 }
77 }
78 return false;
79 }
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