!7

!include once #1035519 // OpenGL Include

/**

 * <pre>

 *   __ __|_  ___________________________________________________________________________  ___|__ __

 *  //    /\                                           _                                  /\    \\

 * //____/  \__     __ _____ _____ _____ _____ _____  | |     __ _____ _____ __        __/  \____\\

 *  \    \  / /  __|  |     |   __|  _  |     |  _  | | |  __|  |     |   __|  |      /\ \  /    /

 *   \____\/_/  |  |  |  |  |  |  |     | | | |   __| | | |  |  |  |  |  |  |  |__   "  \_\/____/

 *  /\    \     |_____|_____|_____|__|__|_|_|_|__|    | | |_____|_____|_____|_____|  _  /    /\

 * /  \____\                       http://jogamp.org  |_|                              /____/  \

 * \  /   "' _________________________________________________________________________ `"   \  /

 *  \/____.                                                                             .____\/

 * </pre>

 *

 * <p>

 * JogAmp JOGL OpenGL ES 2 graph nurbs demo to expose and learn how to use the graph API to draw nurbs.

 *

 * Inside the main JOGL source tree we have the "graph" API that is what we consider the *best* way to render nurbs on all GPU's using a patent free shaders implementation.

 * Graph is suitable for both desktop and mobile GPU processors.

 *

 * In a nutshell the JogAmp Graph API enable you to define nurbs shapes

 * Outline → OutlineShapes → GLRegion

 * and then render the shapes using a Renderer

 * RegionRenderer

 * TextRenderer (same as RegionRender with Helper methods for texts and fonts.)

 *

 * outline.addVertex(x, y, z, w, onCurve);

 * outlineShape.addOutline(outline);

 * region = GLRegion.create(outlineShape, getRenderModes());

 * region.render(gl, outlineShape,...);

 *

 * The graph API is using the math by Rami Santina introduced in 2011

 * https://jogamp.org/doc/gpunurbs2011/p70-santina.pdf

 * https://jogamp.org/doc/gpunurbs2011/graphicon2011-slides.pdf

 *

 * The best documentation for the graph API is found in the JOGL junit tests

 * http://jogamp.org/git/?p=jogl.git;a=tree;f=src/test/com/jogamp/opengl/test/junit/graph;hb=HEAD

 *

 * and javadoc for Outline and OutlineShape .. and all classes i mentioned above..

 * https://www.jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/graph/geom/Outline.html

 * https://www.jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/graph/curve/OutlineShape.html

 * </p>

 *

 * @author Xerxes Rånby (xranby)

 */

    static Animator animator;

    public static void main(String[] args) {

        // Enable JOGL debugging of GLSL shader compilation and GL calls

        System.setProperty( "jogl.debug.GLSLCode", "");

        System.setProperty( "jogl.debug.DebugGL", "");

        GLCapabilities caps = new GLCapabilities(GLProfile.get(GLProfile.GL2ES2));

        caps.setAlphaBits(4);

      GLWindow glWindow = GLWindow.create(caps);

        glWindow.setSize(800,400);

        glWindow.setTitle("JogAmp JOGL Graph API nurbs demo");

        glWindow.setVisible(true);

        glWindow.addGLEventListener(new GraphNurbs() /* GLEventListener */);

        animator = new Animator();

        animator.add(glWindow);

        animator.start();

    }

    private static class GraphNurbs implements GLEventListener{

        // these will define a shape that is defined once at init

        OutlineShape outlineShape;

        RenderState renderState;

        RegionRenderer regionRenderer;

        GLRegion glRegion;

        // these will define a shape that is updated dynamically for each frame

        OutlineShape dynamicOutlineShape;

        RenderState dynamicRenderState;

        RegionRenderer dynamicRegionRenderer;

        GLRegion dynamicGlRegion;

        volatile float weight = 1.0f;

        final float zNear = 0.1f, zFar = 7000f;

        /* 2nd pass texture size antialias SampleCount

           4 is usually enough */

        private final int[] sampleCount = new int[] { 4 };

        /* variables used to update the PMVMatrix before rendering */

        private float xTranslate = -40f;

        private float yTranslate =  0f;

        private float zTranslate = -100f;

        private float angleRotate = 0f;

        private final int renderModes = Region.VARWEIGHT_RENDERING_BIT;

        @Override

        public void init(GLAutoDrawable drawable) {

            final GL2ES2 gl = drawable.getGL().getGL2ES2();

            gl.setSwapInterval(1);

            gl.glEnable(GL.GL_DEPTH_TEST);

            gl.glEnable(GL.GL_BLEND);

            gl.glClearColor(1.0f, 0.0f, 1.0f, 1.0f);

             /* initialize OpenGL specific classes that know how to render the graph API shapes */

            renderState = RenderState.createRenderState(SVertex.factory());

            // define a colour to render our shape with

            renderState.setColorStatic(1.0f, 1.0f, 1.0f, 1.0f);

            renderState.setHintMask(RenderState.BITHINT_GLOBAL_DEPTH_TEST_ENABLED);

            /* use the generic graph API to define a shape

             * we use the renderState getVertexFactory

             * to automatically store all vertex data on the GPU

             **/

            outlineShape = new OutlineShape(renderState.getVertexFactory());

            // Here i add some points off curve causing nurbs bends

            outlineShape.addEmptyOutline();

            outlineShape.addVertex(0.0f,-10.0f, true);

            outlineShape.addVertex(17.0f,-10.0f, true);

            outlineShape.addVertex(11.0f,5.0f, /* onCurve */false);

            outlineShape.addVertex(17.0f,10.0f, true);

            outlineShape.addVertex(7.0f,15.0f, /* onCurve */ false);

            outlineShape.addVertex(6.0f,8.0f, /* onCurve */false);

            outlineShape.addVertex(0.0f,10.0f,true);

            outlineShape.closeLastOutline(true);

            // Here i add all points on curve == straight lines

            float offset = 30;

            outlineShape.addEmptyOutline();

            outlineShape.addVertex(offset+0.0f,-10.0f, true);

            outlineShape.addVertex(offset+17.0f,-10.0f, true);

            outlineShape.addVertex(offset+11.0f,5.0f, true);

            outlineShape.addVertex(offset+16.0f,10.0f, true);

            outlineShape.addVertex(offset+7.0f,15.0f, true);

            outlineShape.addVertex(offset+6.0f,8.0f, true);

            outlineShape.addVertex(offset+0.0f,10.0f, true);

            outlineShape.closeLastOutline(true);

            regionRenderer = RegionRenderer.create(renderState, /* GLCallback */ RegionRenderer.defaultBlendEnable, /* GLCallback */ RegionRenderer.defaultBlendDisable);

            glRegion = GLRegion.create(/* RenderModes */ renderModes, /* TextureSequence */ null);

            glRegion.addOutlineShape(outlineShape, null, glRegion.hasColorChannel() ? renderState.getColorStatic(new float[4]) : null);

            /* initialize OpenGL specific classes that know how to render the graph API shapes */

            dynamicRenderState = RenderState.createRenderState(SVertex.factory());

            // define a RED colour to render our shape with

            dynamicRenderState.setColorStatic(1.0f, 0.0f, 0.0f, 1.0f);

            dynamicRenderState.setHintMask(RenderState.BITHINT_GLOBAL_DEPTH_TEST_ENABLED);

            dynamicRegionRenderer = RegionRenderer.create(dynamicRenderState, /* GLCallback */ RegionRenderer.defaultBlendEnable, /* GLCallback */ RegionRenderer.defaultBlendDisable);

            // we will fill the OutlineShape dynamically in display

            dynamicOutlineShape = new OutlineShape(dynamicRenderState.getVertexFactory());

            dynamicGlRegion = GLRegion.create(/* RenderModes */ renderModes, /* TextureSequence */ null);

        }

        @Override

        public void dispose(GLAutoDrawable drawable) {

            final GL2ES2 gl = drawable.getGL().getGL2ES2();

            //stop the animator thread when user close the window

            animator.stop();

            // it is important to free memory allocated no the GPU!

            // this memory cant be garbage collected by the JVM

            regionRenderer.destroy(gl);

            glRegion.destroy(gl);

            dynamicGlRegion.destroy(gl);

        }

        @Override

        public void display(GLAutoDrawable drawable) {

            final GL2ES2 gl = drawable.getGL().getGL2ES2();

            // use JogAmp high resolution timer for smooth animations!

            double time = com.jogamp.common.os.Platform.currentTimeMicros();

            float sinusAnimation = (float) (Math.sin(time/100000f));

            float sinusAnimationRotate = (float) (Math.sin(time/1000000f));

            // clear screen

            gl.glClearColor(0.2f, 0.2f, 0.2f, 1.0f);

            gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

            // the RegionRenderer PMVMatrix define where we want to render our shape

            final PMVMatrix pmv = regionRenderer.getMatrix();

            pmv.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);

            pmv.glLoadIdentity();

            pmv.glTranslatef(xTranslate, yTranslate, zTranslate);

            pmv.glRotatef(angleRotate+ 10f * sinusAnimationRotate, 0, 0, 1);

            if( weight != regionRenderer.getRenderState().getWeight() ) {

                regionRenderer.getRenderState().setWeight(weight);

            }

            // Draw the static shape using RegionRenderer and GLRegion

            regionRenderer.enable(gl, true);

            glRegion.draw(gl, regionRenderer, sampleCount);

            regionRenderer.enable(gl, false);

            float offset = 60;

            // We will now update the dynamic shape that changes on each frame

            // I will animate the off curve points

            dynamicOutlineShape.clear();

            dynamicOutlineShape.addVertex(offset + 0.0f,-10.0f, true);

            dynamicOutlineShape.addVertex(offset + 17.0f,-10.0f, true);

            dynamicOutlineShape.addVertex(offset + 11.0f +5 * sinusAnimation,5.0f + 5 * sinusAnimation, /* onCurve */false);

            dynamicOutlineShape.addVertex(offset + 17.0f,10.0f, true);

            dynamicOutlineShape.addVertex(offset + 7.0f + 5 * sinusAnimation,15.0f + 5 * sinusAnimation, /* onCurve */ false);

            dynamicOutlineShape.addVertex(offset + 6.0f ,8.0f , true);

            dynamicOutlineShape.addVertex(offset + 0.0f,10.0f, true);

            dynamicOutlineShape.closeLastOutline(true);

            // the RegionRenderer PMVMatrix define where we want to render our shape

            final PMVMatrix dynamicPmv = dynamicRegionRenderer.getMatrix();

            dynamicPmv.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);

            dynamicPmv.glLoadIdentity();

            dynamicPmv.glTranslatef(xTranslate, yTranslate, zTranslate);

            dynamicPmv.glRotatef(angleRotate+ 10f * sinusAnimationRotate, 0, 0, 1);

            if( weight != dynamicRegionRenderer.getRenderState().getWeight() ) {

                dynamicRegionRenderer.getRenderState().setWeight(weight);

            }

            // when changing the OutlineShape dynamically it is very important that you clear the GPU from old data

            dynamicGlRegion.clear(gl);

            // here we upload the new dynamically created data to the GPU

            dynamicGlRegion.addOutlineShape(dynamicOutlineShape, null, glRegion.hasColorChannel() ? renderState.getColorStatic(new float[4]) : null);

             // Draw the dynamic shape using RegionRenderer and GLRegion

            dynamicRegionRenderer.enable(gl, true);

            dynamicGlRegion.draw(gl, dynamicRegionRenderer, sampleCount);

            dynamicRegionRenderer.enable(gl, false);

        }

        @Override

        public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {

            final PMVMatrix pmv = regionRenderer.getMatrix();

            regionRenderer.reshapePerspective(45.0f, width, height, zNear, zFar);

            pmv.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);

            pmv.glLoadIdentity();

            final PMVMatrix dynamicPmv = dynamicRegionRenderer.getMatrix();

            dynamicRegionRenderer.reshapePerspective(45.0f, width, height, zNear, zFar);

            dynamicPmv.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);

            dynamicPmv.glLoadIdentity();

        }

    }