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POAndroid openGL ES 2.0 scene scrolling
 

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  1. POAndroid openGL ES 2.0 scene scrolling
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    <p>I'm working on a simple game for android using openGL es 2.0. Game will be in 2D, something like old supermario, where player can move left-right/up-down but no depth. </p> <p>Level will be larger than screen, so graphics will have to scroll. Here is where the problem comes. I don't know where/when to stop scrolling. </p> <p>Example. Lets say that background is 100x100 sized square with texture. Lets say that on screen there is only 1/4 of the background visible at any time. When I then move screen to the right, I would like it to stop scrolling when right edge of background comes at the edge of the screen.</p> <p>The best I can do now, is to stop scrolling when center of "view" is at the edge of background. But this isn't good, because 3/4 of the screen are than blank.</p> <p>How can I calculate this "offset" from center of view to edge of screen? </p> <p>Note: I don't want to use orthographic projection.</p> <p>Here is code of renderer.</p> <pre><code>package com.huntedseas; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import android.opengl.GLES20; import android.opengl.GLSurfaceView.Renderer; import android.opengl.Matrix; import android.util.Log; public class GameRenderer implements Renderer { protected LevelGenerator generator; protected SquareGL squareGL; protected static float angleX; protected static float angleY; protected static float angleZ; protected static float viewX = 0; protected static float viewY = 0; //private float viewZ = 0; private float[] mProjectionMatrix = new float[16]; //Projekcijska matrika private float[] mVMatrix = new float[16]; private float[] mMVPMatrix = new float[16]; @Override public void onSurfaceCreated(GL10 unused, EGLConfig conunused) { GLES20.glClearColor(1.0f,1.0f,1.0f,1.0f); GLES20.glDisable(GLES20.GL_CULL_FACE); //No culling of back faces \\ To nevem al je treba da je uklopljeno al ne GLES20.glDisable(GLES20.GL_DEPTH_TEST); //No depth testing \\ --||-- GLES20.glEnable(GLES20.GL_BLEND); //Blending GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA,GLES20.GL_ONE_MINUS_SRC_ALPHA); //Interpolated blending generator = new LevelGenerator(); } @Override public void onDrawFrame(GL10 unused) { GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); moveView(); Matrix.setLookAtM(mVMatrix, 0, viewY, viewX, -10, viewY, viewX, 0, 0.0f, 1.0f, 0.0f); //set view Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mVMatrix, 0); //calculate view transformation generator.draw(mMVPMatrix); } @Override public void onSurfaceChanged(GL10 unused, int width, int height) { GLES20.glViewport(0, 0, width, height); float ratio = (float) width/height; float left =-ratio; float right = ratio; float bottom = -1.0f; float top = 1.0f; float near = 1.0f; float far = 20.0f; Log.d("ratio","ratio: "+left+" r: "+right+" w: "+width+" h: "+height); Matrix.frustumM(mProjectionMatrix, 0, left, right, bottom, top, near, far); } long lastTime = System.currentTimeMillis(); public void moveView(){ if((System.currentTimeMillis()-lastTime) &gt;= 33){ lastTime = System.currentTimeMillis(); Log.d("viewX","viewX: "+viewX + "viewY:"+viewY); if( (viewX - angleX/10) &lt; Level1.viewXP &amp;&amp; (viewX - angleX/10) &gt; Level1.viewXM) viewX -= angleX/10; if( (viewY - angleY/10) &lt; Level1.viewYP &amp;&amp; (viewY - angleY/10) &gt; Level1.viewYM) viewY -= angleY/10; //if(Math.abs(viewX - angleX/10) &lt; 10) viewX-=angleX/10; //if(Math.abs(viewY - angleY/10) &lt; 10) viewY-=angleY/10; //if(Math.abs(viewZ - (angleZ-5)/10) &lt; 10) viewZ+=(angleZ-5)/10; } } } </code></pre>
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