Android Open Source - OpenGL-2D-Engine Triangle

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Back to project page OpenGL-2D-Engine.

License

The source code is released under:

Apache License

Java Source Code

package com.foolish.a2de.graphics;
/*www . j a  v a 2 s  .  c  om*/
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import android.opengl.GLES20;
import android.opengl.Matrix;

public class Triangle extends Shape {

  public Triangle(float x, float y, float w, float h) {
    super(x, y, w, h, 3);
  }

  public Triangle(Vector2f pos, float w, float h) {
    super(pos, w, h, 3);
  }

  @Override
  protected void init() {
    super.init();

    ByteBuffer bb = ByteBuffer.allocateDirect(VERTEX_COUNT
        * COORDS_PER_VERTEX * 4);
    bb.order(ByteOrder.nativeOrder());

    Vector3f top = new Vector3f(mPos.x + mWidth / 2, mPos.y, 0);
    Vector3f bottomLeft = new Vector3f(mPos.x, mPos.y - mHeight, 0);
    Vector3f bottomRight = new Vector3f(mPos.x + mWidth, mPos.y - mHeight,
        0);

    mVertexBuffer = bb.asFloatBuffer();
    mVertexBuffer.put(new float[] { top.x, top.y, top.z, bottomLeft.x,
        bottomLeft.y, bottomLeft.z, bottomRight.x, bottomRight.y,
        bottomRight.z });
    mVertexBuffer.position(0);
  }

  public void draw(float[] mvpMatrix) {
    basicDraw();
    
    float[] tmpMvpMatrix = new float[16];
    Matrix.multiplyMM(tmpMvpMatrix, 0, mvpMatrix, 0, mModelMatrix, 0);
    
    GLES20.glUseProgram(mProgram);

    mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
    GLES20.glEnableVertexAttribArray(mPositionHandle);
    GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
        GLES20.GL_FLOAT, false, 0, mVertexBuffer);

    mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");
    GLES20.glUniform4fv(mColorHandle, 1, mShapeColor, 0);

    mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
    GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, tmpMvpMatrix, 0);

    GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, VERTEX_COUNT);
    GLES20.glDisableVertexAttribArray(mPositionHandle);
  }

}

Java Source Code List

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