Android :: 2d Background Image On 3d OpenGL Game
Feb 12, 2009
I need to draw a background of 320 x 480 (fullscreen) for a OpenGL game. What I did was to stretch the texture to 512 x 512 and mapped it to 320,480 quad and then drew the rest of the game elements. I tried changing the texture image to 256x256 and no noticeable improvement in speed. Game was horribly slow even on the real device. It is actually slower on the device than on the emulator... I think i am the first one to have such a situation.. I am drawing a max of 12 triangles only 2 for background and rest are 64 x 64 textures. on 5 quad made with 10 triangles. I have disabled Depth, Lighting already. Only blending enabled as I use transparent PNG for texture of sprites. render cycle is like this - draw the background - draw the sprites (only 5) [with 10 triangles only] - swapbuffer... Please don't advice me to use 2d canvas, bitmap etc... I need to do it in OpenGL only. don't think OpenGL ES 1.0 is so incapable that it can't give me atleast 25-30 fps with just 12 triangles which you one 256x256 texture and one 64x64 textures (used by 5 quads...
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Apr 18, 2010
Let me know how to set up a background image in opengl. 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+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
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Nov 11, 2010
I'm currently developing an Android game where the user controls a plane and evades obstacles. I'm using simple draw commands into a Canvas.
I want to know what is the best way to move a background image to give a sense of speed to the game. Is there a way to make the background- image repeat endlessly or should I load the image twice and move them one behind the other one. Can anyone guide me on this one?
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Oct 13, 2010
What do you think is the best phone for OpenGL ES based game development? Large screen, OS 2.0.1+. Maybe even having the shaders path accessible from NDK.
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Sep 14, 2010
im currently playing around with a Game that architecture is basically like the example 2d Games like JetBoy / LunarLander and so on. But as things now running (and animating continuously) they have kind of "hiccups" when the GC is running. I have done all i can to allocate as much Objects in front. There is nearly nothing that is created "new" besindes some Strings that are used to set the Score and so on. (TextView doesn't take int's =( - So do you have similar Problems that the GC is "lagging" your 2s game ? any solutions ?
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Nov 16, 2009
I have a the beginnings of an Open GL game running, and have gotten to the point where it would be nice to have the FPS displayed. Since I will probably want to be able to put score or other info up anyway, I started searching for how to do that. I found the SpriteTest example, It looks nice, but really complex. Is there an easier way?
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Jun 18, 2009
My game runs fairly well on my phone, but i want to increase the performance by using opengl. However currently i use the Canvas. I am a beginner in opengl. I have to port all my drawing code to opengl. However can somebody give me directions. For example how do i do the following in opengl:
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) for opengl. An implementation of canvas could call the correct opengl methods 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 with opengl? 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 call opengl functions directly? Or is there some kind of abstraction mechanism, so that i can use OpenGL with just a few lines of code?
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Sep 14, 2010
I'm trying to create a particular effect where I have a bunch of particles on the screen which leave trails that slowly fade. I was hoping that I could simply use glClear with a small alpha value to do this but that doesn't seem to be working.My second idea was to draw a black face on the front of the screen but this doesn't seem to be giving me the right effect, the particles are faded but the background doesn't really fade. My next idea is to render to a texture and fade that texture but that's a lot of extra work and I'm not sure if it will solve my problem. Can anyone think of a way to do this? Am I missing something?I'm having trouble finding information about rendering to a texture on android. If anyone has some links to articles that would be great.
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Sep 18, 2009
I've been working on a game framework for a little while, and while its far from perfect, I've put the current version online. To be honest, I haven't used much OpenGL in the past. Before last week I had never tried using it. If anyone would like to take a look, please do, I'd appreciate all the help possible on speeding it up. There are many features I have in mind and am planning at the minute, but so far it supports:
# Texture and Sprite management # Text, using TTF fonts # Organised layers # Two audio management classes, one optimized for music, the other for sound effects # Sprite dynamics (acceleration, terminal velocity, collisions) # Animation # Handlers to manage events fired through movement, animation, screen touches, accelerometer input, device shaking and collisions # Several minor features aimed at speeding development, such as screen settings and vibration.
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Mar 14, 2009
Is it possible to draw a png image and then to run opengl operations on it with android? Is this the right forum to ask this? where can i get more information on doing such stuff?
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Aug 10, 2010
Using OpenGL ES, how do I draw an image from the resources file onto the screen? The image is in png format, if that matters.
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Dec 10, 2009
I'm trying to get the preview images of the android Camera onto a opengl texture. I have been successful so far, it works most of the times. Though sometimes I will just get a black screen when starting/ resuming the application. I have been debugging for days, not finding any clue. When debugging I noticed that both the camera callback and the onDrawFrame are called in such situations. the bytearray of the camera does contain data.
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Feb 4, 2010
I'm trying to develop a 2D game to android using opengl. I know how to print images on the screen and animate them. But in my game I have a map and a want to zoom in and out and scroll the map. But I can't figure out the best way of doing it.
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Apr 8, 2010
Surprisingly, I don't seem to have issues with the OpenGL side of things (which is very unusual), but my problems stem from getting a clear idea for app architecture and a few other problems. Right now, most tutorials on the net just describe the render portion. I know that when I create a GLSurfaceView and hook a Renderer into it, it uses it's own thread for rendering.
I want to do logic operations and other gameplay stuff (like moving characters and whatnot) in it's own thread as well. Can anyone explain a good approach to this? I'm guessing the two threads will have to be synchronized (do logic, render, repeat), and limited based on time so that it performs smoothly across different devices.
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Sep 12, 2009
I want to draw an image that on some levels may be larger than the screen as the background for a Android game. I want the user to be able to scroll the image using their finger on the touch screen.
Here is how I am drawing the background code...
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Mar 8, 2010
I have written a very simple game with some simple animations, but I've noticed that when the phone checks email, or several other apps are running, the animations that update in my thread start behaving slowly or choppy. This is a problem as the game mechanic requires some careful timing of your screen touches based on the animations. So if it starts behaving erratically, the game doesn't really work well - and isn't much fun.
Is there a way to prevent this? Can my threads have a higher priority when they need to run?
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Jun 21, 2010
I am trying to use a nine patch image as a background in an android game. The image expands well in multiple resolutions but, my game has slowed down by 10 fps. I used to get a consistent 45 to 50 fps now I get 35 fps. The question is when we use a nine patch as a drawable and set it as a background in a view does it have any performance implications as opposed to a plain bitmap drawing.
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Nov 8, 2010
I'm planning to develop a 2D game for Android devices without a dedicated GPU, like the HTC Wildfire. I remember from the PC that OpenGL is generally to be chosen over something like SDL for 2D graphics because of speed and features. On Android, there are two APIs for graphics: A "normal" 2D API (does it have a name?) OpenGL ES 2.0 Which one should I favor for a 2D game that should run on Android devices without a dedicated GPU?
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Jun 9, 2012
I'm developing a game for android, and texture problem has been reported on Motorola Droid phones. (Missing/white background in the menu and during the game).
I've tried to fix this with changing the texture sizes to power of 2 (I used jpeg images as backgrounds, and they wasn't power of 2, however this worked fine on all my test devices).
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Dec 15, 2009
I was trying to do a memory game on android, but i can't figure out the code that matching 2 button with the same image..
CODE:..................
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Oct 29, 2009
ListView Question! I know it's possible change the row color, but it's possible to put some imagem on background? And if yes, it's possible to create an imagem 1px and repeat-x or repeat-y like CSS?
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Mar 29, 2010
I want have an image and i want to set it as a background of android list view. i have used android:background="drawable/image" but nothing happened. how to achieve this?
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Apr 28, 2010
I am developing a live Wallpaper on android 2.1
I want to set in background a bitmap that i download on a server. I use canvas with the method setBitmap(Bitmap bitmap); but it don't work. I also try to set it in an ImageView in a different class of my live Wallpaper but it also don't work.
Have you got a solution?
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Oct 2, 2010
I have a background image about 100 x 100 that I want to center in an Android app. Is there a way to do this?
I'm thinking it would greatly help with orientation changes for simple apps.
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Feb 2, 2010
I have an image that I want to place on the background on my activity. For the G1 I would use a background of 320x480 but with the nexus 1 the resolution is almost double that. Should I just place the large image and make the smaller phones size down? I am trying to keep the size of my package down as much as possible.
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Nov 20, 2010
I want to set Image background for linearlyout in android ? can i ? if yes. how ?
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Oct 6, 2010
I have a RelativeLayout with a tiled background. Is there a way to make a tween animation to fade out the existing image and fade in a new one?
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Sep 6, 2010
I created a custom background image and wanted to use it as the background for a layout that has height of wrap_content. However, the total height of the contents of within that layout are much less than the height of the background image.
When I set it as the background in XML via android:background="@drawable/image", I noticed that it displays the entire height of the image, although the height of the actual contents are much shorter.
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May 6, 2010
I'm trying to set my root LinearLayout element (which is set to fill_parent in both dimensions) to have a background image which is always located in the lower left corner of the screen no matter the orientation of the device. It would be excellent if there were some way to set the background image position such as that which you can do with css using "background-position: left bottom;" but I'm not seeing a way to achieve this in Android. Is there a way to do this?
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Apr 26, 2010
I have a linear layout which has a background image (a 9 patched png file). How can I add padding to left and right so that the background image does not take up the whole width? I have tried 'android:paddingLeft' and 'android:paddingRight', but that does not change anything.
CODE:.....
The whole background still stretches the whole screen width.
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