diff --git a/opengl/libs/EGL/egl.cpp b/opengl/libs/EGL/egl.cpp
index bc944a0..f744b72 100644
--- a/opengl/libs/EGL/egl.cpp
+++ b/opengl/libs/EGL/egl.cpp
@@ -285,6 +285,58 @@
 EGLAPI gl_hooks_t gHooksNoContext;
 EGLAPI pthread_key_t gGLWrapperKey = -1;
 
+#if EGL_TRACE
+
+EGLAPI pthread_key_t gGLTraceKey = -1;
+
+// ----------------------------------------------------------------------------
+
+static int gEGLTraceLevel;
+static int gEGLApplicationTraceLevel;
+extern EGLAPI gl_hooks_t gHooksTrace;
+
+static inline void setGlTraceThreadSpecific(gl_hooks_t const *value) {
+    pthread_setspecific(gGLTraceKey, value);
+}
+
+gl_hooks_t const* getGLTraceThreadSpecific() {
+    return static_cast<gl_hooks_t*>(pthread_getspecific(gGLTraceKey));
+}
+
+static void initEglTraceLevel() {
+    char value[PROPERTY_VALUE_MAX];
+    property_get("debug.egl.trace", value, "0");
+    int propertyLevel = atoi(value);
+    int applicationLevel = gEGLApplicationTraceLevel;
+    gEGLTraceLevel = propertyLevel > applicationLevel ? propertyLevel : applicationLevel;
+}
+
+static void setGLHooksThreadSpecific(gl_hooks_t const *value) {
+    if (gEGLTraceLevel > 0) {
+        setGlTraceThreadSpecific(value);
+        setGlThreadSpecific(&gHooksTrace);
+    } else {
+        setGlThreadSpecific(value);
+    }
+}
+
+/*
+ * Global entry point to allow applications to modify their own trace level.
+ * The effective trace level is the max of this level and the value of debug.egl.trace.
+ */
+extern "C"
+void setGLTraceLevel(int level) {
+    gEGLApplicationTraceLevel = level;
+}
+
+#else
+
+static inline void setGLHooksThreadSpecific(gl_hooks_t const *value) {
+    setGlThreadSpecific(value);
+}
+
+#endif
+
 // ----------------------------------------------------------------------------
 
 static __attribute__((noinline))
@@ -459,13 +511,17 @@
 #if !USE_FAST_TLS_KEY
     pthread_key_create(&gGLWrapperKey, NULL);
 #endif
+#if EGL_TRACE
+    pthread_key_create(&gGLTraceKey, NULL);
+    initEglTraceLevel();
+#endif
     uint32_t addr = (uint32_t)((void*)gl_no_context);
     android_memset32(
             (uint32_t*)(void*)&gHooksNoContext, 
             addr, 
             sizeof(gHooksNoContext));
 
-    setGlThreadSpecific(&gHooksNoContext);
+    setGLHooksThreadSpecific(&gHooksNoContext);
 }
 
 static pthread_once_t once_control = PTHREAD_ONCE_INIT;
@@ -677,9 +733,17 @@
         dp->refs++;
         return EGL_TRUE;
     }
-    
-    setGlThreadSpecific(&gHooksNoContext);
-    
+
+#if EGL_TRACE
+
+    // Called both at early_init time and at this time. (Early_init is pre-zygote, so
+    // the information from that call may be stale.)
+    initEglTraceLevel();
+
+#endif
+
+    setGLHooksThreadSpecific(&gHooksNoContext);
+
     // initialize each EGL and
     // build our own extension string first, based on the extension we know
     // and the extension supported by our client implementation
@@ -1238,11 +1302,11 @@
 
         // cur_c has to be valid here (but could be terminated)
         if (ctx != EGL_NO_CONTEXT) {
-            setGlThreadSpecific(c->cnx->hooks[c->version]);
+            setGLHooksThreadSpecific(c->cnx->hooks[c->version]);
             setContext(ctx);
             _c.acquire();
         } else {
-            setGlThreadSpecific(&gHooksNoContext);
+            setGLHooksThreadSpecific(&gHooksNoContext);
             setContext(EGL_NO_CONTEXT);
         }
         _cur_c.release();
@@ -1434,6 +1498,9 @@
                     // Extensions are independent of the bound context
                     cnx->hooks[GLESv1_INDEX]->ext.extensions[slot] =
                     cnx->hooks[GLESv2_INDEX]->ext.extensions[slot] =
+#if EGL_TRACE
+                    gHooksTrace.ext.extensions[slot] =
+#endif
                             cnx->egl.eglGetProcAddress(procname);
                 }
             }
diff --git a/opengl/libs/EGL/trace.cpp b/opengl/libs/EGL/trace.cpp
new file mode 100644
index 0000000..48eeaff
--- /dev/null
+++ b/opengl/libs/EGL/trace.cpp
@@ -0,0 +1,247 @@
+/*
+ ** Copyright 2010, 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.
+ */
+
+#if EGL_TRACE
+
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#include <cutils/log.h>
+
+#include "hooks.h"
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+struct GLenumString {
+    GLenum e;
+    const char* s;
+};
+
+#undef GL_ENUM
+#define GL_ENUM(VAL,NAME) {VAL, #NAME},
+
+static GLenumString g_enumnames[] = {
+#include "enums.in"
+};
+#undef GL_ENUM
+
+static int compareGLEnum(const void* a, const void* b) {
+    return ((const GLenumString*) a)->e - ((const GLenumString*) b)->e;
+}
+
+static const char* GLEnumToString(GLenum e) {
+    GLenumString key = {e, ""};
+    const GLenumString* result = (const GLenumString*) bsearch(
+        &key, g_enumnames,
+        sizeof(g_enumnames) / sizeof(g_enumnames[0]),
+        sizeof(g_enumnames[0]), compareGLEnum);
+    if (result) {
+        return result->s;
+    }
+    return NULL;
+}
+
+static GLenumString g_bitfieldNames[] = {
+    {0x00004000, "GL_COLOR_BUFFER_BIT"},
+    {0x00000400, "GL_STENCIL_BUFFER_BIT"},
+    {0x00000100, "GL_DEPTH_BUFFER_BIT"}
+};
+
+
+static void TraceGLShaderSource(GLuint shader, GLsizei count,
+    const GLchar** string, const GLint* length) {
+    LOGD("const char* shaderSrc[] = {");
+    for (GLsizei i = 0; i < count; i++) {
+        const char* comma = i < count-1 ? "," : "";
+        const GLchar* s = string[i];
+        if (length) {
+            GLint len = length[i];
+            LOGD("    \"%*s\"%s", len, s, comma);
+        } else {
+            LOGD("    \"%s\"%s", s, comma);
+        }
+    }
+    LOGD("};");
+    if (length) {
+        LOGD("const GLint* shaderLength[] = {");
+        for (GLsizei i = 0; i < count; i++) {
+            const char* comma = i < count-1 ? "," : "";
+            GLint len = length[i];
+            LOGD("    \"%d\"%s", len, comma);
+        }
+        LOGD("};");
+        LOGD("glShaderSource(%u, %u, shaderSrc, shaderLength);",
+            shader, count);
+    } else {
+        LOGD("glShaderSource(%u, %u, shaderSrc, (const GLint*) 0);",
+            shader, count);
+    }
+}
+
+static void TraceGL(const char* name, int numArgs, ...) {
+    va_list argp;
+    va_start(argp, numArgs);
+    if (strcmp(name, "glShaderSource") == 0) {
+        va_arg(argp, const char*);
+        GLuint shader = va_arg(argp, GLuint);
+        va_arg(argp, const char*);
+        GLsizei count = va_arg(argp, GLsizei);
+        va_arg(argp, const char*);
+        const GLchar** string = (const GLchar**) va_arg(argp, void*);
+        va_arg(argp, const char*);
+        const GLint* length = (const GLint*) va_arg(argp, void*);
+        TraceGLShaderSource(shader, count, string, length);
+        va_end(argp);
+        return;
+    }
+    const int lineSize = 500;
+    char line[lineSize];
+    int line_index = 0;
+    #define APPEND(...) \
+        line_index += snprintf(line + line_index, lineSize-line_index, __VA_ARGS__);
+    APPEND("%s(", name);
+    for (int i = 0; i < numArgs; i++) {
+        if (i > 0) {
+            APPEND(", ");
+        }
+        const char* type = va_arg(argp, const char*);
+        bool isPtr = type[strlen(type)-1] == '*'
+            || strcmp(type, "GLeglImageOES") == 0;
+        if (isPtr) {
+            const void* arg = va_arg(argp, const void*);
+            APPEND("(%s) 0x%08x", type, (size_t) arg);
+        } else if (strcmp(type, "GLbitfield") == 0) {
+            size_t arg = va_arg(argp, size_t);
+            bool first = true;
+            for (size_t i = 0; i < sizeof(g_bitfieldNames) / sizeof(g_bitfieldNames[0]); i++) {
+                const GLenumString* b = &g_bitfieldNames[i];
+                if (b->e & arg) {
+                    if (first) {
+                        first = false;
+                    } else {
+                        APPEND(" | ");
+                    }
+                    APPEND("%s", b->s);
+                    arg &= ~b->e;
+                }
+            }
+            if (first || arg != 0) {
+                if (!first) {
+                    APPEND(" | ");
+                }
+                APPEND("0x%08x", arg);
+            }
+        } else if (strcmp(type, "GLboolean") == 0) {
+            int arg = va_arg(argp, int);
+            APPEND("%s", arg ? "GL_TRUE" : "GL_FALSE");
+        } else if (strcmp(type, "GLclampf") == 0) {
+            double arg = va_arg(argp, double);
+            APPEND("%g", arg);
+        } else if (strcmp(type, "GLenum") == 0) {
+            GLenum arg = va_arg(argp, int);
+            const char* s = GLEnumToString(arg);
+            if (s) {
+                APPEND("%s", s);
+            } else {
+                APPEND("0x%x", arg);
+            }
+        } else if (strcmp(type, "GLfixed") == 0) {
+            int arg = va_arg(argp, int);
+            APPEND("0x%08x", arg);
+        } else if (strcmp(type, "GLfloat") == 0) {
+            double arg = va_arg(argp, double);
+            APPEND("%g", arg);
+        } else if (strcmp(type, "GLint") == 0) {
+            int arg = va_arg(argp, int);
+            const char* s = NULL;
+            if (strcmp(name, "glTexParameteri") == 0) {
+                s = GLEnumToString(arg);
+            }
+            if (s) {
+                APPEND("%s", s);
+            } else {
+                APPEND("%d", arg);
+            }
+        } else if (strcmp(type, "GLintptr") == 0) {
+            int arg = va_arg(argp, unsigned int);
+            APPEND("%u", arg);
+        } else if (strcmp(type, "GLsizei") == 0) {
+            int arg = va_arg(argp, size_t);
+            APPEND("%u", arg);
+        } else if (strcmp(type, "GLsizeiptr") == 0) {
+            int arg = va_arg(argp, size_t);
+            APPEND("%u", arg);
+        } else if (strcmp(type, "GLuint") == 0) {
+            int arg = va_arg(argp, unsigned int);
+            APPEND("%u", arg);
+        } else {
+            APPEND("/* ??? %s */", type);
+            break;
+        }
+    }
+    APPEND(");");
+    line[lineSize-1] = '\0';
+    LOGD("%s", line);
+    va_end(argp);
+}
+
+#undef TRACE_GL_VOID
+#undef TRACE_GL
+
+#define TRACE_GL_VOID(_api, _args, _argList, ...)                         \
+static void Tracing_ ## _api _args {                                      \
+    TraceGL(#_api, __VA_ARGS__);                                          \
+    gl_hooks_t::gl_t const * const _c = &getGLTraceThreadSpecific()->gl;  \
+    _c->_api _argList;                                                    \
+}
+
+#define TRACE_GL(_type, _api, _args, _argList, ...)                       \
+static _type Tracing_ ## _api _args {                                     \
+    TraceGL(#_api, __VA_ARGS__);                                          \
+    gl_hooks_t::gl_t const * const _c = &getGLTraceThreadSpecific()->gl;  \
+    return _c->_api _argList;                                             \
+}
+
+extern "C" {
+#include "../trace.in"
+}
+#undef TRACE_GL_VOID
+#undef TRACE_GL
+
+#define GL_ENTRY(_r, _api, ...) Tracing_ ## _api,
+
+EGLAPI gl_hooks_t gHooksTrace = {
+    {
+        #include "entries.in"
+    },
+    {
+        {0}
+    }
+};
+#undef GL_ENTRY
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------
+
+#endif // EGL_TRACE