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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ClientAPIExts.h"
#include "EglGlobalInfo.h"
#include "GLcommon/GLutils.h"
#include "GLcommon/TranslatorIfaces.h"
#include "ThreadInfo.h"
#include <GLES/gl.h>
#include <GLES/glext.h>
namespace ClientAPIExts
{
//
// define function pointer type for each extention function
// typename has the form __egl_{funcname}_t
//
#define FUNC_TYPE(fname) __egl_ ## fname ## _t
#define API_ENTRY(fname,params,args) \
typedef void (GL_APIENTRY *FUNC_TYPE(fname)) params;
#define API_ENTRY_RET(rtype,fname,params,args) \
typedef rtype (GL_APIENTRY *FUNC_TYPE(fname)) params;
#include "ClientAPIExts.in"
#undef API_ENTRY
#undef API_ENTRY_RET
/////
// Define static table to store the function value for each
// client API. functions pointers will get initialized through
// ClientAPIExts::initClientFuncs function after each client API has been
// loaded.
/////
#define API_ENTRY(fname,params,args) \
FUNC_TYPE(fname) fname;
#define API_ENTRY_RET(rtype,fname,params,args) \
API_ENTRY(fname,params,args)
static struct _ext_table
{
#include "ClientAPIExts.in"
} s_client_extensions[MAX_GLES_VERSION-1];
#undef API_ENTRY
#undef API_ENTRY_RET
//
// This function initialized each entry in the s_client_extensions
// struct at the givven index using the givven client interface
//
void initClientFuncs(GLESiface *iface, int idx)
{
#define API_ENTRY(fname,params,args) \
s_client_extensions[idx].fname = \
(FUNC_TYPE(fname))iface->getProcAddress(#fname);
#define API_ENTRY_RET(rtype,fname,params,args) \
API_ENTRY(fname,params,args)
//
// reset all func pointers to NULL
//
memset(&s_client_extensions[idx], 0, sizeof(struct _ext_table));
//
// And now query the GLES library for each proc address
//
#include "ClientAPIExts.in"
#undef API_ENTRY
#undef API_ENTRY_RET
}
//
// Define implementation for each extension function which checks
// the current context version and calls to the correct client API
// function.
//
#define API_ENTRY(fname,params,args) \
static void _egl_ ## fname params \
{ \
ThreadInfo* thread = getThreadInfo(); \
if (!thread->eglContext.Ptr()) { \
return; \
} \
int idx = (int)thread->eglContext->version() - 1; \
if (!s_client_extensions[idx].fname) { \
return; \
} \
(*s_client_extensions[idx].fname) args; \
}
#define API_ENTRY_RET(rtype,fname,params,args) \
static rtype _egl_ ## fname params \
{ \
ThreadInfo* thread = getThreadInfo(); \
if (!thread->eglContext.Ptr()) { \
return (rtype)0; \
} \
int idx = (int)thread->eglContext->version() - 1; \
if (!s_client_extensions[idx].fname) { \
return (rtype)0; \
} \
return (*s_client_extensions[idx].fname) args; \
}
#include "ClientAPIExts.in"
#undef API_ENTRY
#undef API_ENTRY_RET
//
// Define a table to map function names to the local _egl_ version of
// the extension function, to be used in eglGetProcAddress.
//
#define API_ENTRY(fname,params,args) \
{ #fname, (__translatorMustCastToProperFunctionPointerType)_egl_ ## fname},
#define API_ENTRY_RET(rtype,fname,params,args) \
API_ENTRY(fname,params,args)
static struct _client_ext_funcs {
const char *fname;
__translatorMustCastToProperFunctionPointerType proc;
} s_client_ext_funcs[] = {
#include "ClientAPIExts.in"
};
static const int numExtFuncs = sizeof(s_client_ext_funcs) /
sizeof(s_client_ext_funcs[0]);
#undef API_ENTRY
#undef API_ENTRY_RET
//
// returns the __egl_ version of the givven extension function name.
//
__translatorMustCastToProperFunctionPointerType getProcAddress(const char *fname)
{
for (int i=0; i<numExtFuncs; i++) {
if (!strcmp(fname, s_client_ext_funcs[i].fname)) {
return s_client_ext_funcs[i].proc;
}
}
return NULL;
}
} // of namespace ClientAPIExts
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