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Derniers articles http://gamedeve.tuxfamily.org Derniers articles (C) 2005-2009 PHPBoost fr PHPBoost Drawing Simple Primitives with OpenGL ES I [en] http://gamedeve.tuxfamily.org/articles/articles-3-7+drawing-simple-primitives-with-opengl-es-i-en.php http://gamedeve.tuxfamily.org/articles/articles-3-7+drawing-simple-primitives-with-opengl-es-i-en.php Drawing Simple Primitives with OpenGL ES Our first application with OpenGL ES was a completely blue screen (nothing special), but now we will start drawing shapes on the screen. To draw any shape with OpenGL ES you need a vertex buffer and an index buffer (you remember these words?). The first thing we’ll do is to create a four vertex buffer and also a four index buffer, this eventually mean four vertices and four indices. In the MyGLRenderer.java file add the line: Code JAVA :<div class="code"><pre style="display:inline;"><pre class="java" style="font-family:monospace;">import java.nio.*;</pre></pre></div> This will allow us to use the different buffers. The following thing to is to add a vertex and index buffer the class as attributes. As you know a vertex is composed from two real numbers in 2D, so the vertex buffer is an array of real numbers, and the index is just a small unsigned integer. So we will use FloatBuffer for vertex buffers and ShortBuffer for index buffer. Add: FloatBuffer _vertexBuffer; and ShortBuffer _indexBuffer; as protected attributes of the MyGLRenderer class. Change the onSurfaceCreated code to the following: Code JAVA :<div class="code"><pre style="display:inline;"><pre class="java" style="font-family:monospace;">public void onSurfaceCreated(GL10 gl, EGLConfig config) { gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glLineWidth(2);   ByteBuffer vbb = ByteBuffer.allocateDirect(4 * <a href="http://www.google.com/search?hl=en&q=allinurl%3Afloat+java.sun.com&btnI=I%27m%20Feeling%20Lucky">Float</a>.SIZE * 2); vbb.order(ByteOrder.nativeOrder()); _vertexBuffer = vbb.asFloatBuffer();   float[] fv = { 50, 50, -50, 50, -50, -50, 50, -50 }; _vertexBuffer.put(fv);   vbb = ByteBuffer.allocateDirect(4 * <a href="http://www.google.com/search?hl=en&q=allinurl%3Ashort+java.sun.com&btnI=I%27m%20Feeling%20Lucky">Short</a>.SIZE); vbb.order(ByteOrder.nativeOrder()); _indexBuffer = vbb.asShortBuffer();   short[] sv = { 0, 1, 2, 3 }; _indexBuffer.put(sv);   _vertexBuffer.position(0); _indexBuffer.position(0);   }</pre></pre></div> <ul class="bb_ul"> <li class="bb_li">glEnableClientState(GL10.GL_VERTEX_ARRAY): Enables the vertex array rendering feature. </li><li class="bb_li">glLineWidth(2): Change the line width to 2. </li><li class="bb_li">We create allocate a new buffer with the size of (4 * Float.SIZE * 2) four vertices, every vertex is two float. </li><li class="bb_li">We create an array of floating values representing four vertices forming a square, and put these values into the buffer. </li><li class="bb_li">We create an array of integers representing four indices and put them into the buffer. </li></ul> Now, go to onDrawFrame and add following lines: Code JAVA :<div class="code"><pre style="display:inline;"><pre class="java" style="font-family:monospace;"> // set the drawing colour gl.glColor4f(1.0f, 0.0f, 0.0f, 1.0f);   gl.glVertexPointer(2, GL10.GL_FLOAT, 0, _vertexBuffer); gl.glDrawElements(GL10.GL_LINES, 4, GL10.GL_UNSIGNED_SHORT, _indexBuffer);</pre></pre></div> glColor4f: sets the drawing colour. Here, we set the red colour (red, green, blue, alpha). glVertexPointer: indicates the vertex buffer to draw. glDrawElements: draw the vertex buffer using the GL_LINES mode and the given index buffer. Running the application will produce the following screen: <img src="http://gamedeve.tuxfamily.org/images/android03.png" alt="" class="valign_" /> Thu, 10 May 2012 23:26:01 +0000 OpenGL ES on Android [en] http://gamedeve.tuxfamily.org/articles/articles-3-6+opengl-es-on-android-en.php http://gamedeve.tuxfamily.org/articles/articles-3-6+opengl-es-on-android-en.php Thu, 10 May 2012 23:05:01 +0000