[android-developers] Re: Game using Canvas porting to OpenGL please help
I am already reading some opengl es tutorials. OpenGL is really low level as i see it, but not that difficult. So i will manage i hope. Greetings 2009/7/1 Alistair. > > Take a look at the sprite drawing code in the apps-for-android code > here > > http://code.google.com/p/apps-for-android/ > > You will see how you go about drawing a bitmap onto the OpenGL > surface. Trying to explain the steps required to re-implement your > sample code in Android might have seemed a bit of a big job hence no > replies. > > I have implemented an abstraction for line drawing in my BulletML demo > which lets you switch between Canvas and OpenGL here: > > http://code.google.com/p/netthreads-for-android/ > > This only handles line drawing though. It's not easy to get your head > around this stuff. I spent a lot of time stumbling around towards a > solution. > > Al. > > On Jun 30, 10:05 pm, TjerkW wrote: > > Nobody can help me? > > > > On 18 jun, 14:12, TjerkW wrote: > > > > > > > > > Hello All, > > > > > My game runs fairly well on my phone, but i want to increase the > > > performance by usingopengl. > > > However currently i use the Canvas. > > > I am a beginner inopengl. > > > I have to port all my drawing code toopengl. However can somebody > > > give me directions. > > > For example how do i do the following inopengl: > > > > > c.save(); > > > c.scale(0.3f+scale, 0.3f+scale, width/2, > height/2); > > > c.drawBitmap( > > > bMsg.bitmap, > > > width/2 - bMsg.bitmap.getWidth()/2, > > > dy+height/2 - > bMsg.bitmap.getHeight()/2, > > > MESSAGE_PAINT > > > ); > > > c.restore(); > > > > > And why cant i just use Canvas as an abstraction layer (facade) > foropengl. > > > An implementation of canvas could call the correctopenglmethods in > > > order to render. > > > Why do i have to port all my code. I thought the canvas was a good > > > abstraction interface to a drawing surface, > > > why do i have to bother withopengl? > > > > > It looks like this is possible, when is see the following contructor: > > > "public Canvas (GL gl)" > > > Also the this seems usefull. > > > SURFACE_TYPE_GPUSurface type: creates a surface suited to be > used > > > with the GPU > > > > > So what should i do? > > > Re implementing the GamePainter completely and callopenglfunctions > > > directly? > > > Or is there some kind of abstraction mechanism, so that i can > useOpenGLwith just a few lines of code? > > > -- -- Tjerk Wolterink @ GMail --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Game using Canvas porting to OpenGL please help
Take a look at the sprite drawing code in the apps-for-android code here http://code.google.com/p/apps-for-android/ You will see how you go about drawing a bitmap onto the OpenGL surface. Trying to explain the steps required to re-implement your sample code in Android might have seemed a bit of a big job hence no replies. I have implemented an abstraction for line drawing in my BulletML demo which lets you switch between Canvas and OpenGL here: http://code.google.com/p/netthreads-for-android/ This only handles line drawing though. It's not easy to get your head around this stuff. I spent a lot of time stumbling around towards a solution. Al. On Jun 30, 10:05 pm, TjerkW wrote: > Nobody can help me? > > On 18 jun, 14:12, TjerkW wrote: > > > > > Hello All, > > > My game runs fairly well on my phone, but i want to increase the > > performance by usingopengl. > > However currently i use the Canvas. > > I am a beginner inopengl. > > I have to port all my drawing code toopengl. However can somebody > > give me directions. > > For example how do i do the following inopengl: > > > c.save(); > > c.scale(0.3f+scale, 0.3f+scale, width/2, height/2); > > c.drawBitmap( > > bMsg.bitmap, > > width/2 - bMsg.bitmap.getWidth()/2, > > dy+height/2 - bMsg.bitmap.getHeight()/2, > > MESSAGE_PAINT > > ); > > c.restore(); > > > And why cant i just use Canvas as an abstraction layer (facade) foropengl. > > An implementation of canvas could call the correctopenglmethods in > > order to render. > > Why do i have to port all my code. I thought the canvas was a good > > abstraction interface to a drawing surface, > > why do i have to bother withopengl? > > > It looks like this is possible, when is see the following contructor: > > "public Canvas (GL gl)" > > Also the this seems usefull. > > SURFACE_TYPE_GPU Surface type: creates a surface suited to be used > > with the GPU > > > So what should i do? > > Re implementing the GamePainter completely and callopenglfunctions > > directly? > > Or is there some kind of abstraction mechanism, so that i can useOpenGLwith > > just a few lines of code? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Game using Canvas porting to OpenGL please help
Nobody can help me? On 18 jun, 14:12, TjerkW wrote: > Hello All, > > My game runs fairly well on my phone, but i want to increase the > performance by usingopengl. > However currently i use the Canvas. > I am a beginner inopengl. > I have to port all my drawing code toopengl. However can somebody > give me directions. > For example how do i do the following inopengl: > > c.save(); > c.scale(0.3f+scale, 0.3f+scale, width/2, height/2); > c.drawBitmap( > bMsg.bitmap, > width/2 - bMsg.bitmap.getWidth()/2, > dy+height/2 - bMsg.bitmap.getHeight()/2, > MESSAGE_PAINT > ); > c.restore(); > > And why cant i just use Canvas as an abstraction layer (facade) foropengl. > An implementation of canvas could call the correctopenglmethods in > order to render. > Why do i have to port all my code. I thought the canvas was a good > abstraction interface to a drawing surface, > why do i have to bother withopengl? > > It looks like this is possible, when is see the following contructor: > "public Canvas (GL gl)" > Also the this seems usefull. > SURFACE_TYPE_GPU Surface type: creates a surface suited to be used > with the GPU > > So what should i do? > Re implementing the GamePainter completely and callopenglfunctions > directly? > Or is there some kind of abstraction mechanism, so that i can useOpenGLwith > just a few lines of code? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
