Example usage for com.google.gwt.webgl.client WebGLRenderingContext RGBA

Introduction

In this page you can find the example usage for com.google.gwt.webgl.client WebGLRenderingContext RGBA.

Prototype

int RGBA

To view the source code for com.google.gwt.webgl.client WebGLRenderingContext RGBA.

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Usage

From source file:com.badlogic.gdx.backends.gwt.GwtGL20.java

License:Apache License

@Override
public void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    // verify request
    if ((format != WebGLRenderingContext.RGBA) || (type != WebGLRenderingContext.UNSIGNED_BYTE)) {
        throw new GdxRuntimeException(
                "Only format RGBA and type UNSIGNED_BYTE are currently supported for glReadPixels(...).");
    }//  ww  w  .j  av  a 2  s .  co  m
    if (!(pixels instanceof ByteBuffer)) {
        throw new GdxRuntimeException(
                "Inputed pixels buffer needs to be of type ByteBuffer for glReadPixels(...).");
    }

    // create new ArrayBufferView (4 bytes per pixel)
    int size = 4 * width * height;
    Uint8Array buffer = Uint8ArrayNative.create(size);

    // read bytes to ArrayBufferView
    gl.readPixels(x, y, width, height, format, type, buffer);

    // copy ArrayBufferView to our pixels array
    ByteBuffer pixelsByte = (ByteBuffer) pixels;
    for (int i = 0; i < size; i++) {
        pixelsByte.put((byte) (buffer.get(i) & 0x000000ff));
    }
}

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From source file:org.parallax3d.parallax.platforms.gwt.GwtGL20.java

License:Open Source License

@Override
public void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    // verify request
    if ((format != WebGLRenderingContext.RGBA) || (type != WebGLRenderingContext.UNSIGNED_BYTE)) {
        throw new ParallaxRuntimeException(
                "Only format RGBA and type UNSIGNED_BYTE are currently supported for glReadPixels(...).");
    }//from ww  w  .j a  v a  2 s.com
    if (!(pixels instanceof ByteBuffer)) {
        throw new ParallaxRuntimeException(
                "Inputed pixels buffer needs to be of type ByteBuffer for glReadPixels(...).");
    }

    // create new ArrayBufferView (4 bytes per pixel)
    int size = 4 * width * height;
    Uint8Array buffer = Uint8ArrayNative.create(size);

    // read bytes to ArrayBufferView
    gl.readPixels(x, y, width, height, format, type, buffer);

    // copy ArrayBufferView to our pixels array
    ByteBuffer pixelsByte = (ByteBuffer) pixels;
    for (int i = 0; i < size; i++) {
        pixelsByte.put((byte) (buffer.get(i) & 0x000000ff));
    }
}

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