Android OpenGL ES color

I. Basic Knowledge: 1. Smooth coloring: combines different colors of multiple vertices to create a beautiful color mix. 2. monotonous coloring: Apply a fixed color to the image. 3. color array defined by the triangle (smooth coloring): [java] int one = 0x10000; // vertex color value of the triangle (r, g, B,) private IntBuffer colorBuffer = IntBuffer. wrap (new int [] {one, one, 0, one, 0, one,}); [java // enable color rendering. gl. glableclientstate (GL10.GL _ COLOR_ARRAY); // sets the color of the triangle vertex gl. glColorPointer (4, GL10.GL _ FIXED, 0, colorBuffer); // disable the color rendering function. gl. glDisableClientState (GL10.GL _ COLOR_ARRAY); 4. color array defined by a square (monotonic colored): [java] view plaincopy/* render square * // set the current color to Blue gl. glColor4f (1.0f, 0.5f, 1.0f, 1.0f); 2. code editing: [Activity01.java] [java] mples_12_02; import android. app. activity; import android. opengl. GLSurfaceView; import android. opengl. GLSurfaceView. renderer; import android. OS. bundle; public class Activity01 extends Activity {Renderer render = new GLRender ();/** Called when the activity is first created. * // @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); GLSurfaceView glView = new GLSurfaceView (this); glView. setRenderer (render); setContentView (glView) ;}} [GLRender. java] [java] package com. yarin. android. examples_12_02; import java. nio. intBuffer; import javax. microedition. khronos. egl. EGLConfig; import javax. microedition. khronos. opengles. GL10; import android. opengl. GLSurfaceView. renderer; public class GLRender implements Renderer {int one = 0x10000; // three vertices of a triangle: private IntBuffer triggerBuffer = IntBuffer. wrap (new int [] {0, one, 0, // top vertex-one,-one, 0, // sit down and click one,-one, 0 ,}); // bottom right vertex // four vertices of the square private IntBuffer quaterBuffer = IntBuffer. wrap (new int [] {one, one, 0,-one, one, 0, one,-one, 0 }); // The vertex color value of the triangle (r, g, B, a) private IntBuffer colorBuffer = IntBuffer. wrap (new int [] {one, 0, one, 0, one, 0, one, 0, 0, one, one,}); @ Override public void onDrawFrame (GL10 gl) {// clear the screen and deep cache gl. glClear (GL10.GL _ COLOR_BUFFER_BIT | GL10.GL _ DEPTH_BUFFER_BIT); // reset the current model observation matrix gl. glLoadIdentity (); // move 1.5 units to the left and 6.0 gl to the screen. glTranslatef (-1.5f, 0.0f,-6.0f); // you can specify a fixed-point array. glableclientstate (GL10.GL _ VERTEX_ARRAY); // sets the color array-enable the color rendering function. gl. glableclientstate (GL10.GL _ COLOR_ARRAY); // sets the color of the triangle vertex gl. glColorPointer (4, GL10.GL _ FIXED, 0, colorBuffer); // sets the vertex gl. glVertexPointer (3, GL10.GL _ FIXED, 0, triggerBuffer); // draw a triangle gl. glDrawArrays (GL10.GL _ TRIANGLES, 0, 3); // close the color array-Disable the color rendering function. gl. glDisableClientState (GL10.GL _ COLOR_ARRAY);/* render square * // set the current color to Blue gl. glColor4f (1.0f, 0.5f, 1.0f, 1.0f); // reset the current model observation matrix gl. glLoadIdentity (); // move 1.5 units to the left and 6.0 gl to the screen. glTranslatef (1.5f, 0.0f,-6.0f); // set and draw a square gl. glVertexPointer (3, GL10.GL _ FIXED, 0, quaterBuffer); gl. glDrawArrays (GL10.GL _ TRIANGLE_STRIP, 0, 4); // cancel the vertex array gl. glDisableClientState (GL10.GL _ VERTEX_ARRAY);} @ Override public void onSurfaceChanged (GL10 gl, int width, int height) {// TODO Auto-generated method stub float ratio = (float) width/height; // set the size of gl in OpenGL. glViewport (0, 0, width, height); // sets the gl projection matrix. glMatrixMode (GL10.GL _ PROJECTION); // reset the PROJECTION matrix gl. glLoadIdentity (); // you can specify the size of the gl. glFrustumf (-ratio, ratio,-1, 1, 1, 10); // select the model observation matrix gl. glMatrixMode (GL10.GL _ MODELVIEW); // resets the model observation matrix gl. glLoadIdentity ();} www.2cto.com @ Override public void onSurfaceCreated (GL10 gl, EGLConfig config) {// enable shadow smooth gl. glShadeModel (GL10.GL _ SMOOTH); // black background gl. glClearColor (0, 0, 0, 0); // sets the deep cache gl. glClearDepthf (1.0f); // enable the deep test gl. glable (GL10.GL _ DEPTH_TEST); // type of the deep test gl. glDepthFunc (GL10.GL _ LEQUAL); // tells the system to modify gl for pivoting. glHint (GL10.GL _ PERSPECTIVE_CORRECTION_HINT, GL10.GL _ FASTEST) ;}} III. Running effect: