Example usage for com.google.gwt.typedarrays.client ArrayBufferView getByteOffset

Introduction

In this page you can find the example usage for com.google.gwt.typedarrays.client ArrayBufferView getByteOffset.

Prototype

public final native int getByteOffset() ;

Source Link

Document

The length of the ArrayBufferView in bytes, as fixed at construction time.

Usage

From source file:playn.html.HtmlGL20.java

License:Apache License

/**
 * Returns the typed array of the given native buffer.
 * Set byteSize to -1 to use remaining()
 *///from ww  w . j av a  2 s . c om
protected ArrayBufferView getTypedArray(Buffer buffer, int type, int byteSize) {
    if (!(buffer instanceof HasArrayBufferView)) {
        throw new RuntimeException("Native buffer required " + buffer);
    }
    HasArrayBufferView arrayHolder = (HasArrayBufferView) buffer;
    int bufferElementSize = arrayHolder.getElementSize();

    ArrayBufferView webGLArray = arrayHolder.getTypedArray();
    if (byteSize == -1) {
        byteSize = buffer.remaining() * bufferElementSize;
    }
    if (byteSize == buffer.capacity() * bufferElementSize && type == arrayHolder.getElementType()) {
        return webGLArray;
    }

    int byteOffset = webGLArray.getByteOffset() + buffer.position() * bufferElementSize;

    switch (type) {
    case FLOAT:
        return Float32Array.create(webGLArray.getBuffer(), byteOffset, byteSize / 4);
    case UNSIGNED_BYTE:
        return Uint8Array.create(webGLArray.getBuffer(), byteOffset, byteSize);
    case UNSIGNED_SHORT:
        return Uint16Array.create(webGLArray.getBuffer(), byteOffset, byteSize / 2);
    case INT:
        return Int32Array.create(webGLArray.getBuffer(), byteOffset, byteSize / 4);
    case SHORT:
        return Int16Array.create(webGLArray.getBuffer(), byteOffset, byteSize / 2);
    case BYTE:
        return Int8Array.create(webGLArray.getBuffer(), byteOffset, byteSize);
    default:
        throw new IllegalArgumentException("Type: " + type);
    }
}

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