1. Introduction To OpenGL in Android Tamillharasan Chandran & Krishnaprasad

2. Concepts Code! Basic Shapes Animation

3. Concepts GPU Cross-Platform

4. Concepts OpenGL OpenGL ES OpenGL ES Not just Android!

5. Concepts Vector Graphics Raster Graphics Lines points, lines, polygons, Surface normals etc .. Grid of pixels

6. OpenGL Rendering Pipeline Simplified

7. One more thing! State Machine

8. Code!

9. Make sure to add this!

10. Two Steps GLSurfaceView GLSurfaceView.Renderer

12. GLSurfaceView GLSurfaceView view = new GLSurfaceView(this); view.setEGLContextClientVersion(2); view.setRenderer(new SquareRenderer());

14. GLSurfaceView.Renderer public class SquareRenderer implements GLSurfaceView.Renderer { public void onSurfaceCreated(GL10 unused, EGLConfig config) { } public void onDrawFrame(GL10 unused) { } public void onSurfaceChanged(GL10 unused, int width, int height) { } } GLES20.glViewport(0, 0, width, height); GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT); GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);

15. There you go!! Your First Android OpenGL App

16. Drawing a Basic Shape

18. -0.5f, -0.5f, 0.0f, // Bottom Left 0.5f, -0.5f, 0.0f, // Bottom Right -0.5f, 0.5f, 0.0f, // Top Left 0.5f, 0.5f, 0.0f, // Top Right

19. private void initShapes(){ float squareCoords[] = { //The coordinates }; // initialize vertex Buffer for square ByteBuffer vbb = ByteBuffer.allocateDirect(squareCoords.length * 4); vbb.order(ByteOrder.nativeOrder()); squareVB = vbb.asFloatBuffer(); squareVB.put(squareCoords); squareVB.position(0); }

21. GL_POINTS GL_LINES GL_LINE_STRIP GL_TRIANGLES GL_TRIANGLE_STRIP GL_TRIANGLE_FAN

22. OpenGL Rendering Pipeline Simplified

25. Vertex Shader Fragment Shader attribute vec4 vertexPosition; void main(){ gl_Position = vertexPosition; } precision mediump float; void main(){ gl_FragColor = vec4(0.5, 0.5, 0.5, 1.0); }

29. attributePositionHandle = GLES20. glGetAttribLocation (shaderProgram,"vertexPosition");

37. Giving life to the objects (Animation)