Android Open Source - Texample2 Texample2 Renderer

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License

The source code is released under:

CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/legalcode

Java Source Code

package com.android.texample2;
// w w  w .jav  a  2 s  . co m
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

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

public class Texample2Renderer implements GLSurfaceView.Renderer  {

  private static final String TAG = "TexampleRenderer";
  private GLText glText;                             // A GLText Instance
  private Context context;                           // Context (from Activity)

  private int width = 100;                           // Updated to the Current Width + Height in onSurfaceChanged()
  private int height = 100;
  private float[] mProjMatrix = new float[16];
  private float[] mVMatrix = new float[16];
  private float[] mVPMatrix = new float[16];

  public Texample2Renderer(Context context)  {
    super();
    this.context = context;                         // Save Specified Context
  }

  public void onSurfaceCreated(GL10 unused, EGLConfig config) {
    // Set the background frame color
    GLES20.glClearColor( 0.5f, 0.5f, 0.5f, 1.0f );
    
    // Create the GLText
    glText = new GLText(context.getAssets());

    // Load the font from file (set size + padding), creates the texture
    // NOTE: after a successful call to this the font is ready for rendering!
    glText.load( "Roboto-Regular.ttf", 14, 2, 2 );  // Create Font (Height: 14 Pixels / X+Y Padding 2 Pixels)

    // enable texture + alpha blending
    GLES20.glEnable(GLES20.GL_BLEND);
    GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA);
  }

  public void onDrawFrame(GL10 unused) {
    // Redraw background color
    int clearMask = GLES20.GL_COLOR_BUFFER_BIT;

    GLES20.glClear(clearMask);
  
    Matrix.multiplyMM(mVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0);
    
    // TEST: render the entire font texture
    glText.drawTexture( width/2, height/2, mVPMatrix);            // Draw the Entire Texture
    
    // TEST: render some strings with the font
    glText.begin( 1.0f, 1.0f, 1.0f, 1.0f, mVPMatrix );         // Begin Text Rendering (Set Color WHITE)
    glText.drawC("Test String 3D!", 0f, 0f, 0f, 0, -30, 0);
//    glText.drawC( "Test String :)", 0, 0, 0 );          // Draw Test String
    glText.draw( "Diagonal 1", 40, 40, 40);                // Draw Test String
    glText.draw( "Column 1", 100, 100, 90);              // Draw Test String
    glText.end();                                   // End Text Rendering
    
    glText.begin( 0.0f, 0.0f, 1.0f, 1.0f, mVPMatrix );         // Begin Text Rendering (Set Color BLUE)
    glText.draw( "More Lines...", 50, 200 );        // Draw Test String
    glText.draw( "The End.", 50, 200 + glText.getCharHeight(), 180);  // Draw Test String
    glText.end();                                   // End Text Rendering
  }

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

    // Take into account device orientation
    if (width > height) {
      Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 1, 10);
    }
    else {
      Matrix.frustumM(mProjMatrix, 0, -1, 1, -1/ratio, 1/ratio, 1, 10);
    }
    
    // Save width and height
    this.width = width;                             // Save Current Width
    this.height = height;                           // Save Current Height
    
    int useForOrtho = Math.min(width, height);
    
    //TODO: Is this wrong?
    Matrix.orthoM(mVMatrix, 0,
        -useForOrtho/2,
        useForOrtho/2,
        -useForOrtho/2,
        useForOrtho/2, 0.1f, 100f);
  }
}

Java Source Code List

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