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POTexture size when using JOGL
 

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  1. POTexture size when using JOGL
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    <p>In my next project, I'm trying to learn JOGL. The result should be a simple 2d animation.</p> <p>I've heard, that a texture must be 2^n*2^n in size. Can I still use images which don't have this size, or do I have to edit all images in advance? What do I have to take care of, when using such textures?</p> <p>As an example, I want to show a kind of progress bar, whose image is at the size of 1024*96px. Do I have to define a quad (eg.1024*1024 in size if you calculate the pixels) and use alpha blending to show only the "filled" part? Or are texture coordinates the way to go?</p> <p>[Edit] Works, solution looks like this (using orthogonal projection):</p> <pre><code>@Override public void init(GLAutoDrawable drawable) { GL gl = drawable.getGL(); // get GL glu = new GLU(); //... t = load(".\\TEXTURES\\ProgressBarBG.png"); //... } public Texture load(String fileName){ Texture text = null; try{ text = TextureIO.newTexture(new File(fileName), false); text.setTexParameteri(GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST); text.setTexParameteri(GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST); }catch(Exception e){ System.out.println(e.getMessage()); System.out.println("Error loading texture " + fileName); } return text; } private void drawProgressBG(GL gl, int z) { gl.glPushMatrix(); gl.glLoadIdentity(); gl.glEnable(GL.GL_BLEND); gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA); gl.glEnable(GL.GL_ALPHA_TEST); gl.glAlphaFunc(GL.GL_GREATER, 0); // only render if alpha &gt; 0 // don't show source alpha parts in the destination gl.glEnable(GL.GL_TEXTURE_2D); TextureCoords tc = t.getImageTexCoords(); t.enable(); t.bind(); gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_REPLACE); gl.glBegin(GL.GL_QUADS); gl.glTexCoord2f(tc.left(), tc.bottom()); gl.glVertex3f( 0f, 0f, z); gl.glTexCoord2f(tc.right(), tc.bottom()); gl.glVertex3f( 1024f, 0f, z); gl.glTexCoord2f(tc.right(), tc.top()); gl.glVertex3f( 1024f, 96f, z); gl.glTexCoord2f(tc.left(), tc.top()); gl.glVertex3f( 0f, 96f, z); gl.glEnd(); gl.glDisable(GL.GL_TEXTURE_2D); // switch back to modulation of quad colours and texture gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_MODULATE); gl.glDisable(GL.GL_ALPHA); // switch off transparency gl.glDisable(GL.GL_BLEND); gl.glPopMatrix(); } </code></pre> <p>[/EDIT]</p>
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