myRenderer

package com.example.nk33785.project3;

import android.content.Context;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.opengl.Matrix;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import yuku.ambilwarna.AmbilWarnaDialog;

public class MyRenderer implements GLSurfaceView.Renderer {

    //region Fields

    private FloatBuffer triangleVB;
    public float angle;
    private final String vertexShaderCode =
            "uniform mat4 uMVPMatrix; \n"
                    + "attribute vec4 vPosition; \n"
                    + "void main(){ \n"
                    +" gl_Position = uMVPMatrix * vPosition; \n"
                    + "} \n";
    private final String fragmentShaderCode =
            "precision mediump float; \n"
                    + "void main(){ \n"
                    + " gl_FragColor = vec4 (0.63671875, 0.76953125, 0.22265625, 1.0); \n"
                    + "} \n";
    private int program, positionHandle, mvpMatrixHandle;
    private float[] projMatrix = new float[16];
    private float[] vMatrix = new float[16];
    private float[] mMatrix = new float[16];
    private float[] mvMatrix = new float[16];
    private float[] mvpMatrix = new float[16];
    int defaultColor = 000000;
    Context context;
    //endregion

    //region Properties
    //endregion

    //region Constructor

    public MyRenderer() {

    }

    //endregion

    //region Methods

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
        initShapes();

        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);

        program = GLES20.glCreateProgram();
        GLES20.glAttachShader(program, vertexShader);
        GLES20.glAttachShader(program, fragmentShader);
        GLES20.glLinkProgram(program);

        positionHandle = GLES20.glGetAttribLocation(program, "vPosition");
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        GLES20.glViewport(0, 0, width, height);
        float ratio = (float) width/height;

        Matrix.frustumM(projMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
        mvpMatrixHandle = GLES20.glGetUniformLocation(program, "uMVPMatrix");
        Matrix.setLookAtM(vMatrix, 0, 0, 0, 3, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        GLES20.glUseProgram(program);

        Matrix.setRotateM(mMatrix, 0, -angle, 0, 0, 1.0f);
        Matrix.multiplyMM(mvMatrix, 0, vMatrix, 0, mMatrix, 0);
        Matrix.multiplyMM(mvpMatrix, 0, projMatrix, 0, mvMatrix, 0);

        GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false, mvpMatrix, 0);

        triangleVB.position(0);
        GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 12, triangleVB);
        GLES20.glEnableVertexAttribArray(positionHandle);
        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
    }

    private void initShapes() {
        float triangleCoords[] = { -0.5f, -0.25f, 0, 0.5f, -0.25f, 0, 0.0f, 0.559016994f, 0 };

        ByteBuffer vbb = ByteBuffer.allocateDirect(triangleCoords.length * 4);
        vbb.order(ByteOrder.nativeOrder());
        triangleVB = vbb.asFloatBuffer();
        triangleVB.put(triangleCoords);
        triangleVB.position(0);
    }

    private int loadShader(int type, String shaderCode) {
        int shader = GLES20.glCreateShader(type);
        GLES20.glShaderSource(shader, shaderCode);
        GLES20.glCompileShader(shader);

        return shader;
    }

    //endregion
    public void openColorPicker(){
        AmbilWarnaDialog colorPicker = new AmbilWarnaDialog(context, defaultColor, new AmbilWarnaDialog.OnAmbilWarnaListener() {
            @Override
            public void onCancel(AmbilWarnaDialog dialog) {

            }

            @Override
            public void onOk(AmbilWarnaDialog dialog, int color) {
                defaultColor = color;

            }
        });
        colorPicker.show();
    }
}