| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gl/GrGLExtensions.h" |
| #include "gl/GrGLDefines.h" |
| #include "gl/GrGLUtil.h" |
| |
| bool GrGLExtensions::init(GrGLBinding binding, |
| GrGLGetStringProc getString, |
| GrGLGetStringiProc getStringi, |
| GrGLGetIntegervProc getIntegerv) { |
| fStrings.reset(); |
| if (NULL == getString) { |
| return false; |
| } |
| bool indexed = false; |
| if (kDesktop_GrGLBinding == binding) { |
| const GrGLubyte* verString = getString(GR_GL_VERSION); |
| if (NULL == verString) { |
| return false; |
| } |
| GrGLVersion version = GrGLGetVersionFromString((const char*) verString); |
| indexed = version >= GR_GL_VER(3, 0); |
| } |
| if (indexed) { |
| if (NULL == getStringi || NULL == getIntegerv) { |
| return false; |
| } |
| GrGLint extensionCnt = 0; |
| getIntegerv(GR_GL_NUM_EXTENSIONS, &extensionCnt); |
| fStrings.push_back_n(extensionCnt); |
| for (int i = 0; i < extensionCnt; ++i) { |
| const char* ext = (const char*) getStringi(GR_GL_EXTENSIONS, i); |
| fStrings[i] = ext; |
| } |
| } else { |
| const char* extensions = (const char*) getString(GR_GL_EXTENSIONS); |
| if (NULL == extensions) { |
| return false; |
| } |
| // First count the extensions so that we don't cause the array to malloc multiple times. |
| int extensionCnt = 1; |
| const char* e = (const char*) extensions; |
| while (NULL != (e = strchr(e+1, ' '))) { |
| e += 1; |
| ++extensionCnt; |
| } |
| fStrings.push_back_n(extensionCnt); |
| |
| int i = 0; |
| while (true) { |
| size_t length = strcspn(extensions, " "); |
| GrAssert(i < extensionCnt); |
| fStrings[i].set(extensions, length); |
| ++i; |
| if ('\0' == extensions[length]) { |
| break; |
| } |
| extensions += length + 1; |
| } |
| GrAssert(i == extensionCnt); |
| } |
| return true; |
| } |
| |
| bool GrGLExtensions::has(const char* ext) const { |
| // TODO: Sort the extensions and binary search. |
| int count = fStrings.count(); |
| for (int i = 0; i < count; ++i) { |
| if (fStrings[i].equals(ext)) { |
| return true; |
| } |
| } |
| return false; |
| } |