Android :: Runs Phone Game Using Canvas Porting To OpenGL
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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Jun 13, 2010
I'm working on an OpenGL ES game using the NDK. My min SDK version is 1.6. I have created an OpenGL Es 1.0 renderer in Java and am calling a native JNI method in that renderloop.
The problem I'm having is that it seems that the resolution of the rendering context is limited. When using the emulator I'm getting a rendering canvas of 480x320, which is fine. Now; when I use my HTC Desire I am only getting a canvas of 533x320 while the native resolution of this phone is 800x480px.
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Dec 20, 2009
I have downloaded and run the SpriteMethodTest on my Droid but compiled to 1.6 Android. I am getting the very strange behavior that drawing bitmaps to *canvas* is faster than using OpenGL. At 100 sprites, I am getting about 64 fps for Canvas. For OpenGL, its around 34 fps.
I also ran the same test on the 1.6 emulator. 100 sprites came in at 30 fps for canvas, just 6 for OpenGL!
I was so astonished that I actually checked that the radio buttons were running the right tests.
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Aug 30, 2010
I am building a 2D game with Android SurfaceView. When I touch the screen the game animation runs slowly. Why, and how can I avoid this?
The touch events are stubs just like onTouchEvents(MotionEvents ev){ empty };. All of the game logic and graphics draw code are in run() in an extends Thread class.
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Mar 17, 2010
I have a Bitmap object and want to render it to a Canvas object with varying levels of translucency (i.e. make the whole bitmap partially see through). For example, I have sprites in a game (that are drawn over the top of a bitmap background) that I want to fade out from being opaque to being invisible. Can I do this without having to resort to OpenGL?
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Mar 11, 2009
Greetings Developers,
I am just putting this question out there.
Is there a large efficiency difference between Canvas.drawBitmap or OpenGL. I am drawing using Canvas.drawBitmap and running slowing FPS, would openGL speed that up a lot you think?
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Nov 6, 2009
Or does it merely provide more options for graphics?
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Jun 15, 2010
I currently have a game written using the Android canvas. It is completely 2D, and I draw bitmaps as sprites on the canvas, and it technically works, but I have a few features that I need to add that will require drawing many more bitmaps on the screen, and there will be a lot more movement.
The app needs more power.
What is the best way to go from this method of drawing Bitmaps on a canvas to using OpenGL so I can draw them faster?
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Jan 8, 2012
I've want to port a game from windows , it's an xbox1 game too, to android, obviously for more high end devices but It will work ,I've been developing s60v5 all my life and am new to android
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Oct 10, 2009
I am developing a chess game, what view should I use for the chessboard, Canvas or SurfaceView? I want to implement some animations like moving a piece, fading the chessboard or maybe rotating the chessboard.
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Aug 9, 2013
would it be possible to port the official Sony Xperia Game Launcher to any android phone? I'm itching to play Wipeout, Tekken and Crash Bandicoot on my S4 but all the emulators suck
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May 21, 2010
I have an Android game that has an activity for the menu, and then another activity for the game that creates a SurfaceView and Thread to deal with canvas drawing and game logic. When you exit the game and start it up again too much or if you open and close the keyboard (thus restarting the activity), the game runs out of memory, usually when loading a bitmap: java.lang.OutOfMemoryError: bitmap size exceeds VM budget keeping all my images in memory without loading them again.
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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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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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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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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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Jul 22, 2010
I based my game off of the lunar lander demo, although heavily modified, and I can get around 40-50fps but the problem is it fluctuates between 40-50fps so much that it causes the moving graphics to jitter! Its very annoying and makes my game look really shitty when in fact its running at a good frame rate.
I tried setting the thread priority higher but that just made it worse... now it will fluctuate between 40-60fps...
I was thinking of limiting the FPS to about 30 so that it will be constant. Is this a good idea and does anyone else have experience or a different solution?
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Jul 22, 2010
I based my game off of the lunar lander demo, although heavily modified, and I can get around 40-50fps but the problem is it fluctuates between 40-50fps so much that it causes the moving graphics to jitter! Its very annoying and makes my game look really shitty when in fact its running at a good frame rate.
I tried setting the thread priority higher but that just made it worse... now it will fluctuate between 40-60fps...
I was thinking of limiting the FPS to about 30 so that it will be constant. Is this a good idea and does anyone else have experience or a different solution?
This is my run loop
CODE:................
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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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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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Jul 7, 2010
My loadMap() method generate a canvas.throwIfRecycled exception when i try to load a new map.
When i start the game, the initial map loads and work fine though,
its only when i try to load a new map that i get the exception ..
How can i "reset" canvas and the bitmap i use to draw into, so i can startover fresh with them ?
here's what i use to create and draw my maps:
CODE:.........
So basicaly once i created and used picDest and canvas, i cannot figure how to reset it all for when i want to load a new map..
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Mar 30, 2009
Does anyone know of, or have implemented, a physics engine which runs smoothly in Android? I have spent the last couple of days trying Phys2D and JBox2D, however both perform very poorly - I am struggling to get even a few objects to simulate smoothly as frequent garbage collection spoils it. One question I do have is will these run smoother on an actual G1 device or is the performance of the emulator accurate?
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Nov 18, 2010
I am interesting in: what is the best way to write applications (for example games or business apps) for so different platforms like Android and Phone 7 with minimal changes in source code, logic and other developing artefacts? Or it is impossible and i must write my application two times from the "ground" for each of devices? Please tell me about your experience?
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Apr 28, 2010
Is it possible to port a C++ application which uses the STL extensively to Android? I understand that currently the NDK does not support this, but is there any effort (open source or otherwise) underway to achieve this?If not is there a way to cross compile libstdc++ for Android?
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Jul 7, 2010
I am attempting to put my C++ program onto an Android phone but have run into several problems with the library linking. It seems most of the useful information I find on this topic through google is outdated (motz) or simply does not account for the complexity of my program. I have been able to run simple C programs but fail when attempting to use libraries outside of Android's Bionic/libc.So my questions are:
Is it possible to port pre-existing *.so libraries onto Android? If so, how could I do this without seg faulting?
Should I be using the CodeSourcery compiler (arm-none-linux-gnueabi-*)? How can I work around the lack of a separate thread library?
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Feb 25, 2009
Single Threaded OpenGL game ! (check bottom, you can download and use the helper class) Lighting disabled ! Depth Buffer disabled ! Culling enabled ! Textures disabled !
Just 176 integers (x,y values only) making 88 vertexes along with 132 index numbers making "44 triangles only"
Framerates I get is
with GL_BLENDING disabled - 145 fps approx only! enabled - 110 fps approx only!
I have the screenshot of exact code in the draw function here.. just 2 damn lines ! I have hidden only the comments.. click here to see it http://prasna991.googlepages.com/drawframe.png
variable details in the 2 lines of code =========================== ipts = 176 elements (only x and y for each vertex) totallinetriangles * 3 = 176 lineindexes = 132 elements - type "short"
Here is the screenshot of output drawing and how it will look like http://prasna991.googlepages.com/screen.png
OpenGL single threaded Initialization Helper ================================ Here is my OpenGL helper class.. makes the OpenGL initialization for newbies a cakewalk http://prasna991.googlepages.com/OpenGLHelperclass.txt
I tested by rendering on the touch event only.. frame rate drops only when u touch and drag and here I have just tested by tapping and releasing gently on the emulator and on the device
Is this the device limitations ? So graphics is actually a lot lot lot slower than on iPhone ?
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Jul 24, 2010
I would like to be able to use the OpenGL API from both Java and C (via NDK).
In Java, there is a GL object passed, which has all GL methods on it.
In C, you just talk to the native library.
In a single onDrawFrame callback (for which Java is passed a GL), can I use methods on the GL object, and also call NDK methods which access the openGL library?
In other words, is the GL object just a wrapper for the same instance of the native library?
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Nov 3, 2010
I have had shoddy internet lately in places that I should not. So I try to update my prl and profile and it just sits there saying "updating." When i cancel out, the phone moves super slow until I do a battery pull.I also can not enable 4g because it makes my EVO run super slow basically horrible.This is with 2.2.
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