Android OpenGL ES image Paster example

Main Activity

public class TestGLCubeActivity extends Activity {    /** Called when the activity is first created. */private GLSurfaceView GLMainView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        GLMainView = new GLSurfaceView(this);        GLMainView.setRenderer(new MyRender06(this));        setContentView(GLMainView);    }        @Override    protected void onResume() {    // TODO Auto-generated method stub    super.onResume();GLMainView.onResume();}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();GLMainView.onPause();}}

Render

Public class myrender06 implements Renderer {private context mcontext; private cube Mcube; myrender06 (context) {mcontext = context; Mcube = new cube () ;}@ overridepublic void onsurfacecreated (gl10 GL, eglconfig config) {GL. glable (gl10.gl _ texture_2d);/* is used to enable shadow smoothness. Shadow smooths colors by using polygon, and smooths external light */GL. glshademodel (gl10.gl _ smooth);/* black background */GL. glclearcolor (0, 0, 0, 0); GL. glcleardepthf (1.0f);/* enable deep test */GL. glable (gl10.gl _ depth_test);/* Imagine the depth cache as the layer behind the screen, which constantly tracks the depth of the object into the screen. * If the depth is small or equal, if it is gl_less, then it is rendered when the depth is small */GL. gldepthfunc (gl10.gl _ lequal);/* tells the system to correct the perspective */GL. glhint (gl10.gl _ perspective_correction_hint, gl10.gl _ nicest); Mcube. loadgltexture (GL, mcontext) ;}@ overridepublic void ondrawframe (gl10 GL) {/* clear screen and depth cache */GL. glclear (gl10.gl _ color_buffer_bit | gl10.gl _ depth_buffer_bit);/* reset the current model observation matrix */GL. glloadidentity ();/* do not move here * // If the Z parameter is-2f, the model matrix is moved from the external screen to 2f, that is, the entire coordinate system is moved in, the figure is much smaller */GL. gltranslatef (0.0f, 0.0f,-2f); Mcube. draw (GL) ;}@ overridepublic void onsurfacechanged (gl10 GL, int width, int height) {/* set the area size to be seen by the eye */GL. glviewport (0, 0, width, height);/* sets the projection matrix to make the object look near, far, and small. */GL. glmatrixmode (gl10.gl _ projection);/* reset the projection matrix so that the origin of the coordinate system returns to the initial position */GL. glloadidentity ();/* set the size of the viewport, near-cut surface, and remote cut surface * for GL. glfrustumf (left, right, bottom, top, znear, zfar) * znear. This indicates your cutting surface, and zfar indicates the cutting surface in the distance, */float ratio = (float) width/height; GL. glfrustumf (-ratio, ratio,-1, 1, 1, 10); // The coordinates of Z are as follows: -1.0f> Z> 10.0f/* select the model observation matrix */GL. glmatrixmode (gl10.gl _ modelview);/* reset the model observation matrix */GL. glloadidentity ();}}

First draw a texture

Public class cube {private floatbuffer vertexbuffer; private floatbuffer texturebuffer; private bytebuffer indexbuffer; private int [] textures = new int [1]; private float vertices [] = {// 6 faces // vertices according to faces-1.0f,-1.0f,-1.1f, // vertex 0 BL 1.0f,-1.0f,-1.1f, // V1 Br-1.0f, 1.0f,-1.1f, // V2 HL 1.0f, 1.0f,-1.1f, // V3 HR }; private float texture [] ={// mapping coordinates for the vertices 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f ,}; private byte indices [] = {// faces definition, 3, 2, // face front}; Public cube () {// coordinate of each vertex bytebuffer bytebuf = bytebuffer. allocatedirect (vertices. length * 4); bytebuf. order (byteorder. nativeorder (); vertexbuffer = bytebuf. asfloatbuffer (); vertexbuffer. put (vertices); vertexbuffer. position (0); // point coordinate of the 2D graph bytebuf = bytebuffer. allocatedirect (texture. length * 4); bytebuf. order (byteorder. nativeorder (); texturebuffer = bytebuf. asfloatbuffer (); texturebuffer. put (texture); texturebuffer. position (0); // The Order indexbuffer = bytebuffer for Fixed-Point plotting. allocatedirect (indices. length); indexbuffer. put (indices); indexbuffer. position (0);} public void draw (gl10 GL) {// if not changed, subsequent texture operations will be performed on this texture. glbindtexture (gl10.gl _ texture_2d, textures [0]); GL. glableclientstate (gl10.gl _ vertex_array); GL. glableclientstate (gl10.gl _ texture_coord_array);/* the front is counterclockwise */GL. glfrontface (gl10.gl _ CCW); GL. glvertexpointer (3, gl10.gl _ float, 0, vertexbuffer); GL. gltexcoordpointer (2, gl10.gl _ float, 0, texturebuffer); GL. gldrawelements (gl10.gl _ triangles, indices. length, gl10.gl _ unsigned_byte, indexbuffer); GL. gldisableclientstate (gl10.gl _ vertex_array); GL. gldisableclientstate (gl10.gl _ texture_coord_array);} public void loadgltexture (gl10 GL, context) {inputstream is = context. getresources (). openrawresource (R. drawable. icon); Bitmap bitmap = NULL; try {bitmap = bitmapfactory. decodestream (is);} finally {try {is. close (); is = NULL;} catch (ioexception e) {}} // generate a texture space GL. glgentextures (1, textures, 0); // bind the generated texture to gl_texture_2dgl.glbindtexture (gl10.gl _ texture_2d, textures [0]); GL. gltexparameterf (gl10.gl _ texture_2d, gl10.gl _ texture_min_filter, gl10.gl _ nearest); GL. gltexparameterf (gl10.gl _ texture_2d, gl10.gl _ texture_mag_filter, gl10.gl _ linear); GL. gltexparameterf (gl10.gl _ texture_2d, gl10.gl _ texture_wrap_s, gl10.gl _ repeat); GL. gltexparameterf (gl10.gl _ texture_2d, gl10.gl _ texture_wrap_t, gl10.gl _ repeat); // Save the image as texture [0] glutils. teximage2d (gl10.gl _ texture_2d, 0, bitmap, 0); bitmap. recycle ();}}