161 lines
4.5 KiB
C++
161 lines
4.5 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ClientAPIExts.h"
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#include "ThreadInfo.h"
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#include <GLES/gl.h>
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#include <GLES/glext.h>
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#include "eglContext.h"
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namespace ClientAPIExts
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{
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//
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// define function pointer type for each extention function
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// typename has the form __egl_{funcname}_t
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//
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#define FUNC_TYPE(fname) __egl_ ## fname ## _t
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// NOLINT: clang-tidy adds parentheses around 'params'.
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#define API_ENTRY(fname,params,args) \
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typedef void (GL_APIENTRY *FUNC_TYPE(fname)) params; // NOLINT
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#define API_ENTRY_RET(rtype,fname,params,args) \
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typedef rtype (GL_APIENTRY *FUNC_TYPE(fname)) params; // NOLINT
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#include "ClientAPIExts.in"
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#undef API_ENTRY
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#undef API_ENTRY_RET
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/////
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// Define static table to store the function value for each
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// client API. functions pointers will get initialized through
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// ClientAPIExts::initClientFuncs function after each client API has been
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// loaded.
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/////
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#define API_ENTRY(fname,params,args) \
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FUNC_TYPE(fname) (fname);
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#define API_ENTRY_RET(rtype,fname,params,args) \
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API_ENTRY(fname,params,args)
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static struct _ext_table
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{
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#include "ClientAPIExts.in"
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} s_client_extensions[2];
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#undef API_ENTRY
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#undef API_ENTRY_RET
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//
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// This function initialized each entry in the s_client_extensions
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// struct at the givven index using the givven client interface
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//
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void initClientFuncs(const EGLClient_glesInterface *iface, int idx)
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{
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#define API_ENTRY(fname,params,args) \
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s_client_extensions[idx].fname = \
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(FUNC_TYPE(fname))iface->getProcAddress(#fname);
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#define API_ENTRY_RET(rtype,fname,params,args) \
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API_ENTRY(fname,params,args)
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//
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// reset all func pointers to NULL
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//
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memset(&s_client_extensions[idx], 0, sizeof(struct _ext_table));
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//
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// And now query the GLES library for each proc address
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//
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#include "ClientAPIExts.in"
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#undef API_ENTRY
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#undef API_ENTRY_RET
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}
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//
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// Define implementation for each extension function which checks
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// the current context version and calls to the correct client API
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// function.
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//
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// NOLINT: clang-tidy adds parentheses around 'args'.
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#define API_ENTRY(fname,params,args) \
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static void _egl_ ## fname params \
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{ \
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EGLThreadInfo* thread = getEGLThreadInfo(); \
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if (!thread->currentContext) { \
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return; \
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} \
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int clientMajorVersion = (int)thread->currentContext->majorVersion; \
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int idx = clientMajorVersion == 1 ? 0 : 1; \
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if (!s_client_extensions[idx].fname) { \
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return; \
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} \
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(*s_client_extensions[idx].fname) args; /* NOLINT */ \
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}
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#define API_ENTRY_RET(rtype,fname,params,args) \
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static rtype _egl_ ## fname params \
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{ \
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EGLThreadInfo* thread = getEGLThreadInfo(); \
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if (!thread->currentContext) { \
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return (rtype)0; \
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} \
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int idx = (int)thread->currentContext->majorVersion - 1; \
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if (!s_client_extensions[idx].fname) { \
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return (rtype)0; \
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} \
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return (*s_client_extensions[idx].fname) args; /* NOLINT */ \
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}
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#include "ClientAPIExts.in"
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#undef API_ENTRY
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#undef API_ENTRY_RET
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//
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// Define a table to map function names to the local _egl_ version of
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// the extension function, to be used in eglGetProcAddress.
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//
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#define API_ENTRY(fname,params,args) \
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{ #fname, (void*)_egl_ ## fname},
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#define API_ENTRY_RET(rtype,fname,params,args) \
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API_ENTRY(fname,params,args)
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static const struct _client_ext_funcs {
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const char *fname;
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void* proc;
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} s_client_ext_funcs[] = {
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#include "ClientAPIExts.in"
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};
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static const int numExtFuncs = sizeof(s_client_ext_funcs) /
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sizeof(s_client_ext_funcs[0]);
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#undef API_ENTRY
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#undef API_ENTRY_RET
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//
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// returns the __egl_ version of the givven extension function name.
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//
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void* getProcAddress(const char *fname)
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{
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for (int i=0; i<numExtFuncs; i++) {
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if (!strcmp(fname, s_client_ext_funcs[i].fname)) {
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return s_client_ext_funcs[i].proc;
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}
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}
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return NULL;
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}
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} // of namespace ClientAPIExts
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