**
** Copyright 2009, 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.
*/

// This source file is automatically generated

#include "jni.h"
#include "JNIHelp.h"
#include <android_runtime/AndroidRuntime.h>
#include <utils/misc.h>

#include <assert.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>

static int initialized = 0;

static jclass nioAccessClass;
static jclass bufferClass;
static jmethodID getBasePointerID;
static jmethodID getBaseArrayID;
static jmethodID getBaseArrayOffsetID;
static jfieldID positionID;
static jfieldID limitID;
static jfieldID elementSizeShiftID;

/* Cache method IDs each time the class is loaded. */

static void
nativeClassInit(JNIEnv *_env, jclass glImplClass)
{
    jclass nioAccessClassLocal = _env->FindClass("java/nio/NIOAccess");
    nioAccessClass = (jclass) _env->NewGlobalRef(nioAccessClassLocal);

    jclass bufferClassLocal = _env->FindClass("java/nio/Buffer");
    bufferClass = (jclass) _env->NewGlobalRef(bufferClassLocal);

    getBasePointerID = _env->GetStaticMethodID(nioAccessClass,
            "getBasePointer", "(Ljava/nio/Buffer;)J");
    getBaseArrayID = _env->GetStaticMethodID(nioAccessClass,
            "getBaseArray", "(Ljava/nio/Buffer;)Ljava/lang/Object;");
    getBaseArrayOffsetID = _env->GetStaticMethodID(nioAccessClass,
            "getBaseArrayOffset", "(Ljava/nio/Buffer;)I");

    positionID = _env->GetFieldID(bufferClass, "position", "I");
    limitID = _env->GetFieldID(bufferClass, "limit", "I");
    elementSizeShiftID =
        _env->GetFieldID(bufferClass, "_elementSizeShift", "I");
}


static void *
getPointer(JNIEnv *_env, jobject buffer, jarray *array, jint *remaining)
{
    jint position;
    jint limit;
    jint elementSizeShift;
    jlong pointer;
    jint offset;
    void *data;

    position = _env->GetIntField(buffer, positionID);
    limit = _env->GetIntField(buffer, limitID);
    elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
    *remaining = (limit - position) << elementSizeShift;
    pointer = _env->CallStaticLongMethod(nioAccessClass,
            getBasePointerID, buffer);
    if (pointer != 0L) {
        *array = NULL;
        return (void *) (jint) pointer;
    }

    *array = (jarray) _env->CallStaticObjectMethod(nioAccessClass,
            getBaseArrayID, buffer);
    offset = _env->CallStaticIntMethod(nioAccessClass,
            getBaseArrayOffsetID, buffer);
    data = _env->GetPrimitiveArrayCritical(*array, (jboolean *) 0);

    return (void *) ((char *) data + offset);
}


static void
releasePointer(JNIEnv *_env, jarray array, void *data, jboolean commit)
{
    _env->ReleasePrimitiveArrayCritical(array, data,
					   commit ? 0 : JNI_ABORT);
}

static void *
getDirectBufferPointer(JNIEnv *_env, jobject buffer) {
    char* buf = (char*) _env->GetDirectBufferAddress(buffer);
    if (buf) {
        jint position = _env->GetIntField(buffer, positionID);
        jint elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
        buf += position << elementSizeShift;
    } else {
        jniThrowException(_env, "java/lang/IllegalArgumentException",
                          "Must use a native order direct Buffer");
    }
    return (void*) buf;
}

static int
getNumCompressedTextureFormats() {
    int numCompressedTextureFormats = 0;
    glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numCompressedTextureFormats);
    return numCompressedTextureFormats;
}

static void glVertexAttribPointerBounds(GLuint indx, GLint size, GLenum type,
        GLboolean normalized, GLsizei stride, const GLvoid *pointer, GLsizei count) {
    glVertexAttribPointer(indx, size, type, normalized, stride, pointer);
}

// --------------------------------------------------------------------------