/*
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 * Copyright (c) 2010 JogAmp Community. All rights reserved.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
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 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
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package com.jogamp.opengl.test.junit.jogl.demos.es2;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.GLUniformData;
import com.jogamp.opengl.fixedfunc.GLMatrixFunc;

import com.jogamp.opengl.util.ImmModeSink;
import com.jogamp.opengl.util.PMVMatrix;
import com.jogamp.opengl.util.glsl.ShaderCode;
import com.jogamp.opengl.util.glsl.ShaderProgram;
import com.jogamp.opengl.util.glsl.ShaderState;

public class MultisampleDemoES2 implements GLEventListener {

    private boolean multisample, clearBuffers;
    private final ShaderState st;
    private final PMVMatrix pmvMatrix;
    private ShaderProgram sp0;
    private GLUniformData pmvMatrixUniform;
    private ImmModeSink immModeSink;

    public MultisampleDemoES2(final boolean multisample) {
        this.multisample = multisample;
        this.clearBuffers = true;
        st = new ShaderState();
        st.setVerbose(true);
        pmvMatrix = new PMVMatrix();
    }

    public void setClearBuffers(final boolean v) { clearBuffers = v; }

    @Override
    public void init(final GLAutoDrawable glad) {
        final GL2ES2 gl = glad.getGL().getGL2ES2();

        System.err.println();
        System.err.println("req. msaa: "+multisample);
        System.err.println("Requested: " + glad.getNativeSurface().getGraphicsConfiguration().getRequestedCapabilities());
        multisample = multisample && glad.getChosenGLCapabilities().getNumSamples() > 0 ;
        System.err.println("Chosen   : " + glad.getChosenGLCapabilities());
        System.err.println("has  msaa: "+multisample);
        System.err.println();

        final ShaderCode vp0 = ShaderCode.create(gl, GL2ES2.GL_VERTEX_SHADER, MultisampleDemoES2.class, "shader",
                "shader/bin", "mgl_default_xxx", true);
        final ShaderCode fp0 = ShaderCode.create(gl, GL2ES2.GL_FRAGMENT_SHADER, MultisampleDemoES2.class, "shader",
                "shader/bin", "mgl_default_xxx", true);
        vp0.defaultShaderCustomization(gl, true, true);
        fp0.defaultShaderCustomization(gl, true, true);

        sp0 = new ShaderProgram();
        sp0.add(gl, vp0, System.err);
        sp0.add(gl, fp0, System.err);
        st.attachShaderProgram(gl, sp0, true);

        pmvMatrixUniform = new GLUniformData("mgl_PMVMatrix", 4, 4, pmvMatrix.getSyncPMv());
        st.ownUniform(pmvMatrixUniform);
        st.uniform(gl, pmvMatrixUniform);

        // Using predef array names, see
        //    GLPointerFuncUtil.getPredefinedArrayIndexName(glArrayIndex);
        immModeSink = ImmModeSink.createGLSL(40,
                                              3, GL.GL_FLOAT,  // vertex
                                              4, GL.GL_FLOAT,  // color
                                              0, GL.GL_FLOAT,  // normal
                                              0, GL.GL_FLOAT,  // texCoords
                                              GL.GL_STATIC_DRAW, st);
        final int numSteps = 20;
        final double increment = Math.PI / numSteps;
        final double radius = 1;
        immModeSink.glBegin(GL.GL_LINES);
        for (int i = numSteps - 1; i >= 0; i--) {
            immModeSink.glVertex3f((float) (radius * Math.cos(i * increment)),
                                   (float) (radius * Math.sin(i * increment)),
                                   0f);
            immModeSink.glColor4f( 1f, 1f, 1f, 1f );
            immModeSink.glVertex3f((float) (-1.0 * radius * Math.cos(i * increment)),
                                   (float) (-1.0 * radius * Math.sin(i * increment)),
                                   0f);
            immModeSink.glColor4f( 1f, 1f, 1f, 1f );
        }
        immModeSink.glEnd(gl, false);

        st.useProgram(gl, false);
    }

    @Override
    public void dispose(final GLAutoDrawable glad) {
        final GL2ES2 gl = glad.getGL().getGL2ES2();
        immModeSink.destroy(gl);
        immModeSink = null;
        st.destroy(gl);
    }

    @Override
    public void display(final GLAutoDrawable glad) {
        final GL2ES2 gl = glad.getGL().getGL2ES2();
        if (multisample) {
            gl.glEnable(GL.GL_MULTISAMPLE);
        }
        if( clearBuffers ) {
            gl.glClearColor(0, 0, 0, 0);
            //      gl.glEnable(GL.GL_DEPTH_TEST);
            //      gl.glDepthFunc(GL.GL_LESS);
            gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        }

        st.useProgram(gl, true);

        immModeSink.draw(gl, true);

        st.useProgram(gl, false);
    }

    // Unused routines
    @Override
    public void reshape(final GLAutoDrawable glad, final int x, final int y, final int width, final int height) {
        System.err.println("reshape ..");
        final GL2ES2 gl = glad.getGL().getGL2ES2();
        pmvMatrix.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
        pmvMatrix.glLoadIdentity();
        // pmvMatrix.glOrthof(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
        pmvMatrix.glOrthof(-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 10.0f);
        pmvMatrix.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
        pmvMatrix.glLoadIdentity();

        st.useProgram(gl, true);
        st.uniform(gl, pmvMatrixUniform);
        st.useProgram(gl, false);
    }

    public void displayChanged(final GLAutoDrawable drawable, final boolean modeChanged, final boolean deviceChanged) {
    }
}
