EGL: Add stubs for EGL_ANDROID_blob_cache

This change adds a stub cache implementation that gets passed to the
underlying EGL implementation at initialization time.

Change-Id: I14437c5b6f91b7a34a19bb02ad802e6e54f88d2a

Author: Jamie Gennis

opengl/libs/Android.mk

@@ -8,6 +8,7 @@ include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= 	       \
 	EGL/egl_tls.cpp        \
+	EGL/egl_cache.cpp      \
 	EGL/egl_display.cpp    \
 	EGL/egl_object.cpp     \
 	EGL/egl.cpp 	       \
@@ -157,4 +158,3 @@ LOCAL_MODULE:= libETC1
 include $(BUILD_SHARED_LIBRARY)
 
 include $(call all-makefiles-under,$(LOCAL_PATH))
-

opengl/libs/EGL/eglApi.cpp

@@ -858,10 +858,17 @@ __eglMustCastToProperFunctionPointerType eglGetProcAddress(const char *procname)
         return  NULL;
     }
 
+    // The EGL_ANDROID_blob_cache extension should not be exposed to
+    // applications.  It is used internally by the Android EGL layer.
+    if (!strcmp(procname, "eglSetBlobCacheFuncs")) {
+        return NULL;
+    }
+
     __eglMustCastToProperFunctionPointerType addr;
     addr = findProcAddress(procname, sExtentionMap, NELEM(sExtentionMap));
     if (addr) return addr;
 
+
     // this protects accesses to sGLExtentionMap and sGLExtentionSlot
     pthread_mutex_lock(&sExtensionMapMutex);
 

opengl/libs/EGL/egl_cache.cpp

@@ -0,0 +1,95 @@
+/*
+ ** Copyright 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 "egl_cache.h"
+#include "egl_display.h"
+#include "egl_impl.h"
+#include "egldefs.h"
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+#define BC_EXT_STR "EGL_ANDROID_blob_cache"
+
+//
+// EGL_ANDROID_blob_cache types and functions
+//
+typedef khronos_ssize_t EGLsizei;
+
+typedef void (*EGLSetBlobFunc) (const void* key, EGLsizei keySize,
+        const void* value, EGLsizei valueSize);
+
+typedef EGLsizei (*EGLGetBlobFunc) (const void* key, EGLsizei keySize,
+        void* value, EGLsizei valueSize);
+
+typedef void (EGLAPIENTRYP PFNEGLSETBLOBCACHEFUNCSPROC) (EGLDisplay dpy,
+        EGLSetBlobFunc set, EGLGetBlobFunc get);
+
+//
+// egl_cache_t definition
+//
+static void setBlob(const void* key, EGLsizei keySize, const void* value,
+        EGLsizei valueSize) {
+}
+
+static EGLsizei getBlob(const void* key, EGLsizei keySize, void* value,
+        EGLsizei valueSize) {
+    return 0;
+}
+
+egl_cache_t* egl_cache_t::get() {
+    static egl_cache_t theCache;
+    return &theCache;
+}
+
+void egl_cache_t::initialize(egl_display_t *display) {
+    for (int i = 0; i < IMPL_NUM_IMPLEMENTATIONS; i++) {
+        egl_connection_t* const cnx = &gEGLImpl[i];
+        if (cnx->dso && cnx->major >= 0 && cnx->minor >= 0) {
+            const char* exts = display->disp[i].queryString.extensions;
+            size_t bcExtLen = strlen(BC_EXT_STR);
+            size_t extsLen = strlen(exts);
+            bool equal = !strcmp(BC_EXT_STR, exts);
+            bool atStart = !strncmp(BC_EXT_STR " ", exts, bcExtLen+1);
+            bool atEnd = (bcExtLen+1) < extsLen &&
+                    !strcmp(" " BC_EXT_STR, exts + extsLen - (bcExtLen+1));
+            bool inMiddle = strstr(" " BC_EXT_STR " ", exts);
+            if (equal || atStart || atEnd || inMiddle) {
+                PFNEGLSETBLOBCACHEFUNCSPROC eglSetBlobCacheFuncs;
+                eglSetBlobCacheFuncs =
+                        reinterpret_cast<PFNEGLSETBLOBCACHEFUNCSPROC>(
+                            cnx->egl.eglGetProcAddress("eglSetBlobCacheFuncs"));
+                if (eglSetBlobCacheFuncs == NULL) {
+                    LOGE("EGL_ANDROID_blob_cache advertised by display %d, "
+                            "but unable to get eglSetBlobCacheFuncs", i);
+                    continue;
+                }
+
+                eglSetBlobCacheFuncs(display->disp[i].dpy, setBlob, getBlob);
+                EGLint err = cnx->egl.eglGetError();
+                if (err != EGL_SUCCESS) {
+                    LOGE("eglSetBlobCacheFuncs resulted in an error: %#x",
+                            err);
+                }
+            }
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------

opengl/libs/EGL/egl_cache.h

@@ -0,0 +1,33 @@
+/*
+ ** Copyright 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.
+ */
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+class egl_display_t;
+
+class egl_cache_t {
+public:
+
+    static egl_cache_t* get();
+
+    void initialize(egl_display_t* display);
+};
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------

opengl/libs/EGL/egl_display.cpp

@@ -14,6 +14,7 @@
  ** limitations under the License.
  */
 
+#include "egl_cache.h"
 #include "egl_display.h"
 #include "egl_object.h"
 #include "egl_tls.h"
@@ -170,6 +171,8 @@ EGLBoolean egl_display_t::initialize(EGLint *major, EGLint *minor) {
         }
     }
 
+    egl_cache_t::get()->initialize(this);
+
     EGLBoolean res = EGL_FALSE;
     for (int i = 0; i < IMPL_NUM_IMPLEMENTATIONS; i++) {
         egl_connection_t* const cnx = &gEGLImpl[i];