Light Racer 3D uses dynamic text by drawing to a HUD canvas and then uploading that texture for each update. It did work to upload the new texture every frame (score changing every tick) but it did have a slight impact on performance. I ended up just updating every 10 frames. For my next game I'm going to add a utility that uploads an alphanumeric texture and stores letter sizes and coords, then draws a quad for each, like was suggested above. It takes a little longer to build that but once you've got it, it will be the fastest solution for really dynamic stuff like scores that change very often or timers that count down with 100ths of a second or something like that.
On Sep 1, 9:51 pm, David Minor <davemi...@gmail.com> wrote: > I believe you can also draw text on a Canvas, and then use the > underlying bitmap to create a texture. > > On Sep 1, 4:21 pm, Dan Sherman <impact...@gmail.com> wrote: > > > Yeah, that's what we were looking into doing. Was just hoping that there > > might be a nice framework I missed somehow :) > > > Thanks man :) > > > On Tue, Sep 1, 2009 at 3:10 PM, Phred <phr...@gmail.com> wrote: > > > > Dan,I've yet to start messing with GL ES so this is coming from > > > Direct3D experience but the idea is the same. > > > > What you can do is create a texture with all the letters of the > > > alphabet, numbers 0-9 and symbols. There are apps out there that will > > > create such a texture and an XML file that contains the texture co- > > > ords for each letter/number/symbol. This one would work as it exports > > > in PNG format which Android supports: > > >http://www.angelcode.com/products/bmfont/ > > > > To draw the text you have render 1 quad for each alpha-numeric > > > character being drawn at the location on screen you want it drawn too. > > > So if your text is "Hello" then you will have to render 5 quads. Each > > > quad will contain the texture co-ords of the corresponding alpha- > > > numeric character in the texture. > > > > I would create a vertex buffer object at start-up and make it large > > > enough to hold 256 characters. Your draw text function would then fill > > > out this buffer each frame update with the updated text location co- > > > ordinates then all you have to do is get OpenGL to render it. You will > > > want it rendered in orthographic projection mode and using screen > > > space co-ordinates... that is you don't want OpenGL to transform or > > > light those verticies for you. Again not sure of the GLES pipeline as > > > all my experience is Direct3D. > > > > Make sense kinda kinda? > > > > Fred > > > > On Aug 24, 3:27 pm, Dan Sherman <impact...@gmail.com> wrote: > > > > We're having the same issues in some of our games. Unfortunately > > > > running > > > > into issues drawing dynamic text in OpenGL, any chance you'd care to > > > share > > > > your solution for that? (if you have one that is) > > > > > - Dan > > > > > On Mon, Aug 24, 2009 at 2:39 PM, TjerkW <tje...@gmail.com> wrote: > > > > > > The SpriteMethodTest application shows the benefits of opengl, > > > > > the main benefit is: > > > > > > If you have a lot of sprites / a lot of things happening at the same > > > > > time it is better to use opengl. > > > > > I am porting my game to opengl now. It was too slow on only the Canvas > > > > > (30+ things moving at the same time) > > > > > > On 22 jul, 12:45, MrChaz <mrchazmob...@googlemail.com> wrote: > > > > > > The SurfaceView is fine for games, at least simple ones. > > > > > > Have a look at the LunarLander sample. > > > > > > >http://developer.android.com/guide/samples/LunarLander/index.html > > > > > > > On Jul 21, 9:33 pm, klirr <haskell...@gmail.com> wrote: > > > > > > > > I use SurfaceView for my game, tried normal View first but that > > > > > > > was > > > to > > > > > > > slow. > > > > > > > Problem is, it still is. The redrawing just isn't anywhere fast > > > enough > > > > > > > for a game. So unless it is a lot faster on the real phone this > > > won't > > > > > > > cut it at all. > > > > > > > Is it necessary to use OpenGL for games? > > > > > > > > package com.android.shmup; > > > > > > > > import android.app.Activity; > > > > > > > import android.content.Context; > > > > > > > import android.graphics.*; > > > > > > > import android.os.Bundle; > > > > > > > import android.view.View; > > > > > > > import android.view.KeyEvent; > > > > > > > > public class Shmup extends Activity { > > > > > > > > @Override > > > > > > > protected void onCreate(Bundle savedInstanceState) { > > > > > > > super.onCreate(savedInstanceState); > > > > > > > setContentView(new GameView(this)); > > > > > > > } > > > > > > > > private static class GameView extends View { > > > > > > > private Paint mPaint = new Paint(); > > > > > > > private int x; > > > > > > > private int y; > > > > > > > > public GameView(Context context) { > > > > > > > super(context); > > > > > > > x = 135; > > > > > > > y = 303; > > > > > > > setFocusable(true); > > > > > > > requestFocus(); > > > > > > > } > > > > > > > > @Override > > > > > > > protected void onDraw(Canvascanvas) { > > > > > > > Paint paint = mPaint; > > > > > > > canvas.translate(10, 10); > > > > > > > canvas.drawColor(Color.rgb(184,134,11)); > > > > > > > paint.setColor(Color.rgb(107,142,35)); > > > > > > > paint.setStrokeWidth(1); > > > > > > > canvas.drawRect(x, y, x+30, y+7, paint); > > > > > > > canvas.drawRect(x+10, y+7, x+20, y+27, paint); > > > > > > > canvas.drawRect(x+5, y+27, x+25, y+32, paint); > > > > > > > } > > > > > > > > @Override > > > > > > > public boolean onKeyDown(int keyCode, KeyEvent event) { > > > > > > > if (keyCode == KeyEvent.KEYCODE_DPAD_UP) { > > > > > > > y -= 3; > > > > > > > invalidate(); > > > > > > > } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) > > > > > > > { > > > > > > > x -= 3; > > > > > > > invalidate(); > > > > > > > } else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) > > > > > > > { > > > > > > > y += 3; > > > > > > > invalidate(); > > > > > > > } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) > > > { > > > > > > > x += 3; > > > > > > > invalidate(); > > > > > > > } > > > > > > > return true; > > > > > > > } > > > > > > > > } > > > > > > > > } > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. 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