Example usage for com.google.gwt.typedarrays.client Uint8Array get

Introduction

In this page you can find the example usage for com.google.gwt.typedarrays.client Uint8Array get.

Prototype

public native final int get(int index) ;

Source Link

Document

Returns the element at the given numeric index.

Usage

From source file:forplay.html.HtmlGraphicsGL.java

License:Apache License

/**
 * Try basic GL operations to detect failure cases early.
 * //from w  w w .ja v a  2s  . c om
 * @return true if calls succeed, false otherwise.
 */
private boolean tryBasicGlCalls() {
    int err;

    try {
        // test that our Float32 arrays work (a technique found in other WebGL checks)
        Float32Array testFloat32Array = Float32Array.create(new float[] { 0.0f, 1.0f, 2.0f });
        if (testFloat32Array.get(0) != 0.0f || testFloat32Array.get(1) != 1.0f
                || testFloat32Array.get(2) != 2.0f) {
            throw new RuntimeException("Typed Float32Array check failed");
        }

        // test that our Int32 arrays work
        Int32Array testInt32Array = Int32Array.create(new int[] { 0, 1, 2 });
        if (testInt32Array.get(0) != 0 || testInt32Array.get(1) != 1 || testInt32Array.get(2) != 2) {
            throw new RuntimeException("Typed Int32Array check failed");
        }

        // test that our Uint16 arrays work
        Uint16Array testUint16Array = Uint16Array.create(new int[] { 0, 1, 2 });
        if (testUint16Array.get(0) != 0 || testUint16Array.get(1) != 1 || testUint16Array.get(2) != 2) {
            throw new RuntimeException("Typed Uint16Array check failed");
        }

        // test that our Uint8 arrays work
        Uint8Array testUint8Array = Uint8Array.create(new int[] { 0, 1, 2 });
        if (testUint8Array.get(0) != 0 || testUint8Array.get(1) != 1 || testUint8Array.get(2) != 2) {
            throw new RuntimeException("Typed Uint8Array check failed");
        }

        // Perform GL read back test where we paint rgba(1, 1, 1, 1) and then read back that data.
        // (should be 100% opaque white).
        bindFramebuffer();
        gl.clearColor(1, 1, 1, 1);
        err = gl.getError();
        if (err != NO_ERROR) {
            throw new RuntimeException("Read back GL test failed to clear color (error " + err + ")");
        }
        updateLayers();
        Uint8Array pixelData = Uint8Array.create(4);
        gl.readPixels(0, 0, 1, 1, RGBA, UNSIGNED_BYTE, pixelData);
        if (pixelData.get(0) != 255 || pixelData.get(1) != 255 || pixelData.get(2) != 255) {
            throw new RuntimeException("Read back GL test failed to read back correct color");
        }
    } catch (RuntimeException e) {
        ForPlay.log().info("Basic GL check failed: " + e.getMessage());
        return false;
    } catch (Throwable t) {
        ForPlay.log().info("Basic GL check failed with an unknown error: " + t.getMessage());
        return false;
    }

    return true;
}

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From source file:playn.html.HtmlGLContext.java

License:Apache License

private void tryBasicGLCalls() throws RuntimeException {
    // test that our Float32 arrays work (a technique found in other WebGL checks)
    Float32Array testFloat32Array = Float32Array.create(new float[] { 0.0f, 1.0f, 2.0f });
    if (testFloat32Array.get(0) != 0.0f || testFloat32Array.get(1) != 1.0f || testFloat32Array.get(2) != 2.0f) {
        throw new RuntimeException("Typed Float32Array check failed");
    }//from   w  w  w. j ava 2s  . c  om

    // test that our Int32 arrays work
    Int32Array testInt32Array = Int32Array.create(new int[] { 0, 1, 2 });
    if (testInt32Array.get(0) != 0 || testInt32Array.get(1) != 1 || testInt32Array.get(2) != 2) {
        throw new RuntimeException("Typed Int32Array check failed");
    }

    // test that our Uint16 arrays work
    Uint16Array testUint16Array = Uint16Array.create(new int[] { 0, 1, 2 });
    if (testUint16Array.get(0) != 0 || testUint16Array.get(1) != 1 || testUint16Array.get(2) != 2) {
        throw new RuntimeException("Typed Uint16Array check failed");
    }

    // test that our Uint8 arrays work
    Uint8Array testUint8Array = Uint8Array.create(new int[] { 0, 1, 2 });
    if (testUint8Array.get(0) != 0 || testUint8Array.get(1) != 1 || testUint8Array.get(2) != 2) {
        throw new RuntimeException("Typed Uint8Array check failed");
    }

    // Perform GL read back test where we paint rgba(1, 1, 1, 1) and then read back that data.
    // (should be 100% opaque white).
    bindFramebuffer();
    clear(1, 1, 1, 1);
    int err = glc.getError();
    if (err != NO_ERROR) {
        throw new RuntimeException("Read back GL test failed to clear color (error " + err + ")");
    }
    Uint8Array pixelData = Uint8Array.create(4);
    glc.readPixels(0, 0, 1, 1, RGBA, UNSIGNED_BYTE, pixelData);
    if (pixelData.get(0) != 255 || pixelData.get(1) != 255 || pixelData.get(2) != 255) {
        throw new RuntimeException("Read back GL test failed to read back correct color");
    }
}

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