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/*
* 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;
}
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