How to move a particular texture around screen in android using opengl es?

I am very new to OpenGL ES. I am implementing some demo app to load multiple textures on the screen. For demo purpose I have loaded 2 textures in 2 different locations on the screen using glTranslatef() and glBindTextures() twice.

Now I am able to see 2 different images on the screen. Now I want to move one particular texture across the screen using mouse.

I know it may be silly topic开发者_如何学Go, but please help me in this..

Thanks in advance..

As mentioned above you will need to translate the coordinates of the surface.

If you are using orthagonal (2D) projection, the pixel/coord ratio can be set to 1:1 easily by defining the projection to be the same size as the screen. For example:

 glOrthof(0.0f, screenWidth, -screenHeight, 0.0f, -1.0f, 1.0f);

should define a projection with (0,0) in the top left and the same size as your screen.

If you are using 3D projection, you may find this link helpful: http://www.mvps.org/directx/articles/rayproj.htm

You don't actually want to move the texture, but either you move your Scene point of view ( gluortho2d / glulookat / gltranslatef - or anything else ), or you move the vertices of the shape you're applying your texture to.

this is how im doing it in my 2D game :

gl.glTranslatef(-cameraPosX % 32, -cameraPosY % 32, 0);