Import EGL/GLES translator

external/android-emugl/host/libs/Translator/EGL/ClientAPIExts.cpp

@@ -0,0 +1,159 @@
+/*
+* 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(const 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