+/*
+* 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 "OpenGLESDispatch/GLESv2Dispatch.h"
+#include "OpenGLESDispatch/EGLDispatch.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "emugl/common/shared_library.h"
+
+extern EGLDispatch s_egl;
+
+static emugl::SharedLibrary *s_gles2_lib = NULL;
+
+namespace {
+constexpr const char *glesv2_lib_env_var{"ANDROID_GLESv2_LIB"};
+}
+
+// An unimplemented function which prints out an error message.
+// To make it consistent with the guest, all GLES2 functions not supported by
+// the driver should be redirected to this function.
+
+static void gles2_unimplemented() {
+ fprintf(stderr, "Called unimplemented GLESv2 API\n");
+}
+
+//
+// This function is called only once during initialiation before
+// any thread has been created - hence it should NOT be thread safe.
+//
+bool gles2_dispatch_init(const char *path, GLESv2Dispatch *dispatch_table)
+{
+ const char *libName = getenv(glesv2_lib_env_var);
+ if (!libName)
+ libName = path;
+ if (!libName)
+ return false;
+
+ char error[256];
+ s_gles2_lib = emugl::SharedLibrary::open(libName, error, sizeof(error));
+ if (!s_gles2_lib) {
+ fprintf(stderr, "%s: Could not load %s [%s]\n", __FUNCTION__,
+ libName, error);
+ return false;
+ }
+
+ //
+ // init the GLES dispatch table
+ //
+#define LOOKUP_SYMBOL(return_type,function_name,signature,callargs) \
+ dispatch_table-> function_name = reinterpret_cast< function_name ## _t >( \
+ s_gles2_lib->findSymbol(#function_name));
+
+#define LOOKUP_EXT_SYMBOL(return_type,function_name,signature,callargs) \
+ dispatch_table-> function_name = reinterpret_cast< function_name ## _t >( \
+ s_egl.eglGetProcAddress(#function_name));
+
+ LIST_GLES2_FUNCTIONS(LOOKUP_SYMBOL,LOOKUP_EXT_SYMBOL)
+
+ dispatch_table->initialized = true;
+
+ return true;
+}
+
+//
+// This function is called only during initialization before
+// any thread has been created - hence it should NOT be thread safe.
+//
+void *gles2_dispatch_get_proc_func(const char *name, void *userData)
+{
+ void* func = NULL;
+
+ if (s_gles2_lib && !func) {
+ func = (void *)s_gles2_lib->findSymbol(name);
+ }
+
+ if (!func) {
+ func = (void *)s_egl.eglGetProcAddress(name);
+ }
+
+ // To make it consistent with the guest, redirect any unsupported functions
+ // to gles2_unimplemented.
+ if (!func) {
+ func = (void *)gles2_unimplemented;
+ }
+ return func;
+}