Fix pointer-to-int and int-to-pointer warnings.

Change-Id: If534cbcf2c3e644270572cbf829ba9b5acab29e6

opengl/tools/glgen/stubs/egl/eglGetDisplay.cpp

@@ -14,7 +14,8 @@ static jobject
 android_eglGetDisplayInt
   (JNIEnv *_env, jobject _this, jint display_id) {
 
-    if ((EGLNativeDisplayType)display_id != EGL_DEFAULT_DISPLAY) {
+    if (static_cast<uintptr_t>(display_id) !=
+        reinterpret_cast<uintptr_t>(EGL_DEFAULT_DISPLAY)) {
         jniThrowException(_env, "java/lang/UnsupportedOperationException", "eglGetDisplay");
         return 0;
     }

opengl/tools/glgen/stubs/gles11/glDrawElementsInstanced.cpp

@@ -32,7 +32,7 @@ android_glDrawElementsInstanced__IIIII
         (GLenum)mode,
         (GLsizei)count,
         (GLenum)type,
-        (GLvoid *)indicesOffset,
+        (GLvoid *)static_cast<uintptr_t>(indicesOffset),
         (GLsizei)instanceCount
     );
 }

opengl/tools/glgen/stubs/gles11/glGetTransformFeedbackVarying.cpp

@@ -157,7 +157,11 @@ android_glGetTransformFeedbackVarying__IIILjava_nio_IntBuffer_2Ljava_nio_IntBuff
         (GLsizei *)length,
         (GLint *)size,
         (GLenum *)type,
-        (char *)name
+        // The cast below is incorrect. The driver will end up writing to the
+        // address specified by name, which will always crash the process since
+        // it is guaranteed to be in low memory. The additional static_cast
+        // suppresses the warning for now. http://b/19478262
+        (char *)static_cast<uintptr_t>(name)
     );
     if (_typeArray) {
         releasePointer(_env, _typeArray, type, JNI_TRUE);