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POandroid/openGL: fill a 2d viewport with a square
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  1. POandroid/openGL: fill a 2d viewport with a square
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    copied!<p>What I've managed to accomplish so far is:</p> <ul> <li>Initialise the GLSurfaceView/Renderer</li> <li>Draw a triangle on the screen</li> <li>Render a square/rectangle on the screen</li> <li>Add a bitmap texture to the screen</li> <li>Ensure PNG transparency is honoured when rendering</li> <li>Automatically scale the triangles so they show up correctly for all screen sizes</li> </ul> <p>However, after fixing the scaled triangles, the background rectangle (with texture) no longer fills up the screen.</p> <p><img src="https://i.stack.imgur.com/e4Fui.gif" alt="The background no longer fills up the screen"></p> <p>I've been stuck on this for a while now and absolutely baffled to the point I have thrown in the towel.</p> <p>The main parts I'm unsure about is the use of glFrustumf() and gluLookAt().</p> <pre><code>@Override public void onSurfaceChanged(GL10 gl, int width, int height) { gl.glViewport(0, 0, width, height); ratio = (float) width / height; gl.glMatrixMode(GL10.GL_PROJECTION); // set matrix to projection mode gl.glLoadIdentity(); // reset the matrix to its default state gl.glFrustumf(-ratio, ratio, -1, 1, 3, 7); // apply the projection matrix } @Override public void onDrawFrame(GL10 gl) { // Clear the screen gl.glClear(GL10.GL_COLOR_BUFFER_BIT); // Set GL_MODELVIEW transformation mode gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); // reset the matrix to its default state // When using GL_MODELVIEW, you must set the camera view GLU.gluLookAt(gl, 0, 0, -5f, 0f, 0f, 0f, 0.0f, 1.0f, 0.0f); bg.draw(gl); // ... } </code></pre> <p>If anybody has a moment to take a look at the problem, I've uploaded the files to <a href="https://bitbucket.org/koonkii/test_opengl/src" rel="nofollow noreferrer">https://bitbucket.org/koonkii/test_opengl/src</a> so you don't have to recreate the code by copy-pasting.</p>
 

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