Posted by Aksenov239 on Nov 01, 2016; 7:25pm
URL: https://forum.jogamp.org/TextRegionUtil-not-rendering-with-right-color-tp4037371.html

Hello, I'm trying to draw strings with variable color depending on time, but couldn't succeed. I think, I misunderstood something about opengl and jogl, so, do not judge me.

I've put everything into the simple code.

<code>
RenderState renderState;
RegionRenderer renderer;
TextRegionUtil textRegionUtil;

public void init(GLAutoDrawable drawable) {
        GL2 gl = drawable.getGL().getGL2();

        RenderState renderState = RenderState.createRenderState(SVertex.factory());
        regionRenderer = RegionRenderer.create(GraphicsGL.renderState,
                RegionRenderer.defaultBlendEnable, RegionRenderer.defaultBlendDisable);
        regionRenderer.init(gl, Region.MAX_QUALITY |  Region.COLORCHANNEL_RENDERING_BIT);

        textRegionUtil = new TextRegionUtil(Region.MAX_QUALITY |
                Region.COLORCHANNEL_RENDERING_BIT);

        regionRenderer.enable(gl, true);
        regionRenderer.reshapeOrtho(width, height, 0.1f, 1000f);
        regionRenderer.enable(gl, false);

        gl.glClearDepth(1f);
        gl.glEnable(GL.GL_DEPTH_TEST);
        gl.glDepthFunc(GL.GL_LEQUAL);
}

public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
        GL2 gl = drawable.getGL().getGL2();
        if (height == 0) height = 1;
        this.width = width;
        this.height = height;
        gl.glViewport(0, 0, width, height);

        gl.glMatrixMode(GL2.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glOrtho(0, Widget.BASE_WIDTH, 0, Widget.BASE_HEIGHT, -1, 1);

        gl.glMatrixMode(GL2.GL_MODELVIEW);
        gl.glLoadIdentity();

        regionRenderer.enable(gl, true);
        regionRenderer.reshapeOrtho(width, height, 0.1f, 1000.0f);
        regionRenderer.enable(gl, false);
}

public void display(GLAutoDrawable drawable) {
        GL2 gl = drawable.getGL().getGL2();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glLoadIdentity();
        gl.glClearColor(1, 0, 1, 0);

        PMVMatrix pmv = GraphicsGL.renderState.getMatrix();
        pmv.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
        pmv.glLoadIdentity();
        pmv.glTranslatef(0, 0, -300);
        Font font = null;
        try {
            font = FontFactory.getDefault().getDefault();//GraphicsGL.fonts.get("Open Sans Light");
        } catch (IOException e) {}
        float pixelSize = font.getPixelSize(32, 96);
//        regionRenderer.enable(gl, true);
        textRegionUtil.drawString3D(gl,
                regionRenderer, font, pixelSize, "Test4", new float[] {1, 1, 1, 1}, new int[]{4});
//        regionRenderer.enable(gl, false);
}
</code>

I'm expecting from this code to draw me a purple background with white colored text in lower-bottom corner.

The code, as it is, draws me a purple background but with black colored text.
If I uncomment - the code doesn't draw any text.

Also, I've tried unsuccessfully instead of creating TextRegionUtil:

TextRegionUtil.drawString3D(gl, Region.MAX_QUALITY | Region.COLORCHANNEL_RENDERING_BIT,
                GraphicsGL.regionRenderer, font, pixelSize, "Test",
                new float[] {1, 1, 1, 1}, new int[] {4}, new AffineTransform(), new AffineTransform());

Again black text with comments and without - even black background.

Could you help me with that? Unfortunately, setStaticColor is not an option, because I need to change the alpha of the string depending on time, while to renew static color I need to call textRegionUtil.clear(gl) or something like that. The last makes the background black instead of purple - and I don't know how to make gl together with textRegionUtil in this case.

Thanks in advance.
Vitaly Aksenov