/** * Called back immediately after the OpenGL context is initialized. Can be used to perform * one-time initialization. Run only once. */ @Override public void init(GLAutoDrawable drawable) { GL2 gl = drawable.getGL().getGL2(); // get the OpenGL graphics context glu = new GLU(); // get GL Utilities gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // set background (clear) color gl.glClearDepth(1.0f); // set clear depth value to farthest // Do not enable depth test // gl.glEnable(GL_DEPTH_TEST); // enables depth testing // gl.glDepthFunc(GL_LEQUAL); // the type of depth test to do gl.glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // best perspective correction gl.glShadeModel(GL_SMOOTH); // blends colors nicely, and smoothes out lighting // Load the texture image try { // Use URL so that can read from JAR and disk file. BufferedImage image = ImageIO.read(this.getClass().getResource(textureFileName)); // Create a OpenGL Texture object texture = AWTTextureIO.newTexture(GLProfile.getDefault(), image, false); // Use linear filter if image is larger than the original texture gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); // Use linear filter if image is smaller than the original texture gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); } catch (GLException | IOException e) { e.printStackTrace(); } // Texture image flips vertically. Shall use TextureCoords class to retrieve // the top, bottom, left and right coordinates, instead of using 0.0f and 1.0f. TextureCoords textureCoords = texture.getImageTexCoords(); textureCoordTop = textureCoords.top(); textureCoordBottom = textureCoords.bottom(); textureCoordLeft = textureCoords.left(); textureCoordRight = textureCoords.right(); // Enable the texture texture.enable(gl); texture.bind(gl); // gl.glEnable(GL_TEXTURE_2D); // Enable blending gl.glEnable(GL_BLEND); gl.glBlendFunc(GL_SRC_ALPHA, GL_ONE); // Allocate the stars for (int i = 0; i < stars.length; i++) { stars[i] = new Star(); // Linearly distributed according to the star number stars[i].distance = ((float) i / numStars) * 5.0f; } }
protected void beginDrawIcons(DrawContext dc) { GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility. this.oglStackHandler.clear(); int attributeMask = GL2.GL_DEPTH_BUFFER_BIT // for depth test, depth mask and depth func | GL2.GL_TRANSFORM_BIT // for modelview and perspective | GL2.GL_VIEWPORT_BIT // for depth range | GL2.GL_CURRENT_BIT // for current color | GL2.GL_COLOR_BUFFER_BIT // for alpha test func and ref, and blend | GL2.GL_DEPTH_BUFFER_BIT // for depth func | GL2.GL_ENABLE_BIT; // for enable/disable changes this.oglStackHandler.pushAttrib(gl, attributeMask); // Apply the depth buffer but don't change it. if ((!dc.isDeepPickingEnabled())) gl.glEnable(GL.GL_DEPTH_TEST); gl.glDepthMask(false); // Suppress any fully transparent image pixels gl.glEnable(GL2.GL_ALPHA_TEST); gl.glAlphaFunc(GL2.GL_GREATER, 0.001f); // Load a parallel projection with dimensions (viewportWidth, viewportHeight) this.oglStackHandler.pushProjectionIdentity(gl); gl.glOrtho( 0d, dc.getView().getViewport().width, 0d, dc.getView().getViewport().height, -1d, 1d); this.oglStackHandler.pushModelview(gl); this.oglStackHandler.pushTexture(gl); if (dc.isPickingMode()) { this.pickSupport.beginPicking(dc); // Set up to replace the non-transparent texture colors with the single pick color. gl.glEnable(GL.GL_TEXTURE_2D); gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_TEXTURE_ENV_MODE, GL2.GL_COMBINE); gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_SRC0_RGB, GL2.GL_PREVIOUS); gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_COMBINE_RGB, GL2.GL_REPLACE); } else { gl.glEnable(GL.GL_TEXTURE_2D); gl.glEnable(GL.GL_BLEND); gl.glBlendFunc(GL.GL_ONE, GL.GL_ONE_MINUS_SRC_ALPHA); } }