I'm just learning OpenGL ES on Android, and I am trying to get some kind of anisotropic filtering on textures. I want to increase the size of a sprite, with some kind of interpolation, instead of this "nearest-pixel-interpolation".
Is there anything like this in the OpenGL ES standard or do I have to make one texture for each size?
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I am using opengl for drawing 3d stuff, but so far I've been unable to use transparent textures...
This is what I do...
CODE:..............
I'm learning OpenGL on my own atm and I have a question about texturing a surface:
I can create a simple polygon like this:
CODE:......
Then I load all of that info into the approriate buffers and draw it to the screen with a call to:
CODE:..
My question:
I'm looking for a good example of how to take an image and texture it to the surface.
I can't seem to get GLUtils.texImage2D to use my full RGBA (A=my alpha component).
I've tried doing setEGLConfigChooser(8, 8, 8, 8, 0, 0); getHolder().setFormat(PixelFormat.RGBA_8888);
I've tried converting the source image (.png in ARGB) to RGBA.. which works ok for the ordering of data before texImage2D, but when it draws, it draws yellow where it should be "transparent white"... which suggests it's diminishing the "B"(blue) component instead of the A(alpha) component. But the same thing happens when I just use the orignal ARGB data instead ("B" diminishes instead of "A", leaving yellow).
I created a little texture drawing class from observing the LabelMaker example in the Android SDK. One thing I can't find however is how to rotate textures drawn with glDrawTexiOES. is it possible? I've just tried glRotatef but it has no effect.
View 1 Replies View RelatedIn Android OpenGL ES, I want to be able to switch textures for a given Rectangle. I have one rect and I put two textures, depending on different conditions. I just want to switch between textures.
I followed this code to create the textures: http://blog.poweredbytoast.com/loading-opengl-textures-in-android but it seems that this is only for one texture.
If I use only one texture, it renders fine, but then I don't know how to tell the rect to use another texture (same rect, different texture). Do I do something like "setTexture" with the ID that is generated in loadTextures()? Do I have to have an array with texture names (numbers) that I then change .. I just don't get it..
I need to enlarge(Zoom) Textures when I hold&drag at the corners.
I am using glOrtho() to setup ModelView.
CODE:.............
I am able to do hit-test and detect corners of the images(Textures) on the screen.
Now I need to enlarge(zoom) the image(texture). I have offset values, means how far I moved on the screen in X,Y directions.
If I need to use glScalef(), it will accept values in percentage(I think). How can I map the offset values to this percentage value.
or is there any other way to zoom(ie by enlarging the background polygon vertices, so that the mapped texture will automatically get zoomed) ? In this method, I am fixing the polygon sides at time of Surface Creation.
Good pattern for loading textures in an Android Java & OpenGL ES app.
My first concern is determining how many texture names to allocate and how I can efficiently go about doing this prior to rendering my vertices.
My second concern is in loading the textures, I have to infer the texture to be loaded based on my game data. This means I'll be playing around with strings, which I understand is something I really shouldn't be doing in my GL thread.
Overall I understand what's happening when loading textures, I just want to get the best lifecycle out of it. Are there any other things I should be considering?
I'm developing a game for android using OpenGL es and have hit a problem:
My game loads fine in the emulator (windows xp and vista from eclipse), it also loads fine on a T-Mobile G2 (HTC Hero) however when I load it on my new HTC Desire none of the textures appear to load correctly (or at all). I'm suspecting the BitmapFactory.decode method although I have no evidence that that is the problem.
All of my textures are power of 2 and JPG textures seem to load (although they don't look great quality) but anything that is GIF or PNG just doesn't load at all except for a 2x2 red square which loads fine and one texture that maps to a 3d object but seems to fill each triangle of the mesh with the nearest colour).
This is my code for loading images:
CODE:...........................
I have a texture-mapped cube based in part on the Kube API demo and the Textured Cube example from anddev.org, It is working fine using bitmaps loaded from R.drawable.. what I need to do now is to make the texture for each face dynamic (using Bitmaps created in code). I'm having trouble understanding how to change the textures on the fly and I'm hoping someone can point me in the right direction.What would I need to change in this code to allow an existing texture to be replaced (eg. a new Bitmap would be passed in instead of loading the resource, but when I try this the texture remains unchanged).
View 5 Replies View RelatedHow do I track the memory used by OpenGL textures in Android? I understand the texture memory is on the Video RAM, but do they get swapped in with the RAM? If I call glGenTextures and do not call glDeleteTextures, how does it impact the memory usage of my current process?
View 1 Replies View Relatedhow to apply apply different textures on different faces of a cylinder?I am able to apply one texture which covers the whole cylinder.But I want one texture for each face.
View 7 Replies View RelatedSo I'm doing some simple 2D stuff with OpenGL on Android and found the performance to be very, very poor. To give you an example, I made an app with a full screen LSurfaceView. I loaded a 512x1024 texture (containing a 480x854 image), set up an orthogonal 2D matrix, and set it to draw a 480x854 pixel quad with that texture, using vertex and texture arrays. Lighting, dither, blending, etc. is disabled.
I would expect this to run at 60fps without problem, but that simple operation already drags the frame drawing time to 19ms/frame. If I add some more small textured quads around the screen, the drawing time goes up to 22/24ms. If I enable blending it balloons to 28/30ms. This is testing on a Motorola Milestone, running 2.0.1. Is this normal? Am I doing something wrong or is it just a common problem in Android?
Basically I have a fully functional ogl program (2D game) in opengl es 1.1, everything works fine except for one problem: glcolor
I'm trying to set some of my texture to half transparent and I would like to do it as follows;
gl.glColor4f(1f, 1f, 1f, .5f);
obj.draw(gl);
...
gl.glColor4f(1f, 1f, 1f, 1f);
I'm using VBO for my vertice, my textures and indices. (if that is relevant)
the problem is that nothing gets set to 50% transparency...
I'm don't think relevant to post all my code (mainly because it is spread out several classes with several GL options changing (blends, scissors etc etc).
What I would like is for people to tell me what state of OGL could prevent glcolor form working like I want, what functions should I check, what state should I call.
I ran into a rather strange problem with my OpenGL game. While most textures look good, five or six are not drawn on Droid, and I don't see anything special about these images/models. For example, my HUD is made of 4 elements. The upper part is drawn correctly, while the lower part appears as white rectangles. The code used for loading and drawing these models and textures is exactly the same. Textures are 32-bit TGAs in both cases, POT dimensions, in - nodpi, inScaled==false, using GLSurfaceView to rule out configuration issues. No problems on G1 and Hero (and of course on emulator). And I don't have the Droid, so I can't just try whatever comes to my mind. Asked users to send me logs - no errors, all models and images appear to load normally.
View 2 Replies View RelatedI'm using GLSurfaceView for one of my applications and I've encountered a problem. It seems I can only create textures when in onSurfaceChanged, after that glGenTextures only returns 0. I've tried without glGenTextures and keeping track of texture indices myself, but the textures generated just turn up white. Is it only possible to load these types of resources in onSurfaceChanged (and possible onSurfaceCreated)? Or am I missing something?
View 2 Replies View RelatedIn Android OpenGL ES, I want to be able to switch textures for a given Rectangle. I have one rect and I put two textures, depending on different conditions. I just want to switch between textures.
I followed this code to create the textures: link text
and they render fine, but then I don't know how to tell the given rect to use another texture. Do I do something like "setTexture" with the ID that is generated in loadTextures() ? Do I have to have an array with texture names (numbers) that I then change .. I just don't get it..
I'm using GLSurfaceView to render OpengGL 3D. It works great on my nexus one, the emulators, and at least the G1. However, on the droid, the textures are white. I've seen this problem before when textures aren't loaded, and also when they aren't powers of two dimensions (not the case here). What's weird is that this started when I converted my program to use GLSurfaceView (it used to be based on some older example where I was doing the EGL stuff myself).
Textures displayed on the screen are white, but shapes that are just colors are displayed just fine.
The person testing this for me on their droid does not have the sdk, so if anyone would like to run this with the debugger, let me know and I can get you the apk.
I have just began opengl programming in android and i am fairly new to opengl as well. I've been using nehe's opengl tutorials as well as insanitydesign's android ports.I successfully managed to create a cube with a single texture mapped to all its 6 faces. I even mapped multiple textures to different faces of the cube.But the way I did it was to create 6 faces seperately, have 6 seperate index and texture buffers and then using glBindTexture() with the selected texture for each face and then calling glDrawElements. Isn't there an efficient way around this. Should i use a cube map texture instead of a GL_TEXTURE_2D?
View 4 Replies View RelatedI have just began opengl programming in android and i am fairly new to opengl as well. I've been using nehe's opengl tutorials as well as insanitydesign's android ports. I successfully managed to create a cube with a single texture mapped to all its 6 faces. I even mapped multiple textures to different faces of the cube.But the way I did it was to create 6 faces seperately, have 6 seperate index and texture buffers and then using glBindTexture() with the selected texture for each face and then calling glDrawElements. Isn't there an efficient way around this. Should i use a cube map texture instead of a GL_TEXTURE_2D?
View 1 Replies View RelatedQuestion before I dive deeper into converting my current rendering system to openGL. I heard that textures needed to be in base2 sizes in order to be stored for rendering. Is this true?
My application is very tight on memory, but most of the bitmaps are not a perfect square. Does storing non-base 2 textures waste extra memory?
I have troubles with OpenGL textures on Motorola Milestone with 2.1 firmware. Each call to glGenTextures fails with error GL_INVALID_OPERATION and sets the id with random numbers. The exact same application works on G1 without any error.
View 1 Replies View RelatedI'm creating an opengl es application and I would like to be able to dynamically create the text of my buttons etc.
The 2 obvious reasons for that are:
-to be modular (changing the text quickly without using photoshop)
-to be able to add languages later down the line
give me the basic steps/functions to:
create textures form text load custom fonts to display text textures with the chosen custom font indicate if I can use this for loading Kanji ?
I am drawing some textures with alpha channel, but when they are displayed it looks like the alpha channel is only binary. So a pixel is either transparent or opaque, although in the texture file itself the pixel is half-transparent.
The blending is set up like this:
code:............
The above shows how it should be like, and the below shows how it is:
i came from a blackberry so learning here..but i know how to set up my pop email account to go through gmail and get sent to my phone, however can i filter only certain emails to my phone? i really dont want them all going to my phone as i read most via computer, i only want ones coming from certain contacts being sent to my phone.
View 13 Replies View RelatedI am looking for an all-in-one SMS app that can filter incoming messages based on words and phrases in the message. The reason being that I have monitoring systems at work that send SMS alerts and sometimes the alerts are just FYI, not OMG's
So anyways, right now I have a Hero, so I use Handcent for the replacement of the stock app until it is fixed and SMS Firewall to filter incoming messages and do the alerting. Being a 2 part solution it works very well, but I was curious if anyone has tried anything that has it all in one.
I have tried a few of the apps out there and none seem to work right.
Here's what I tried without success
aFirewall (didn't seem to filter properly)
SMS manager (can't remember what was wrong)
SMS Guard (kept getting a force close when a message came in)
PandaFirewall (didn't filter anything properly when I tested)
GSMS (force close when trying to view inbox)
I was going to try UltimateSMS, but it appears to have been removed from the Market.
I have a problem, I need some hints. I need to have my app receive certain kind of sms (say meant for my app). is it possible?Is it possible to receive all the sms in my app rather than default sms app? How to configuration my app to receive sms?please help with some links and stuff.
View 3 Replies View RelatedI am trying to write a clean bit of code that can list the people in a 1.5/1.6 Contacts data store, and I do not see how I filter out the cruft that Google throws in (ad hoc "contacts" literally addressed by other apps and stored, for some reason, in the contact list without a clear means of discerning them from the real people the user cared to enter - the ones that would appear in the contacts app). I see that in 2.0 or so, "IN_VISIBLE_GROUP" is added as a field which seems to differentiate these versions, but what existed to accomplish this before that time? Here is my code which works in 2.x and fails to keep the chaff out in 1.x, as the selection parameter is unsupported:
final String[] proj = new String[] { Contacts.People._ID, Contacts.People.NAME };
final String selection = Build.VERSION.SDK_INT < 5 ? null : ContactsContract.Contacts.IN_VISIBLE_GROUP + "=1";
Cursor people = context.getContentResolver().query( Contacts.People.CONTENT_URI, proj, selection, null, Contacts.People.DEFAULT_SORT_ORDER);
if (people != null) { final int personIdColumn = people .getColumnIndexOrThrow(Contacts.People._ID);
final int nameColumn = people .getColumnIndexOrThrow(Contacts.People.NAME);
while (people.moveToNext()) { if (Thread.interrupted()) { people.close();
outputList.clear(); throw new InterruptedException();
} long personId = people.getLong(personIdColumn);
String name = people.getString(nameColumn);
if (name != null) { outputList.add(new Contact(personId, name));
} } // clean up cursor people.close();
}
I have a ListView (with setTextFilterEnabled(true)) and a custom adapter (extends ArrayAdapter) which I update from the main UI thread whenever a new item is added/inserted. Everything works fine at first--new items show up in the list immediately. However this stops the moment I try to filter the list.Filtering works, but I do it once and all of my succeeding attempts to modify the contents of the list (add, remove) don't display anymore. I used the Log to see if the adapter's list data gets updated properly, and it does, but it's no longer in sync with the ListView shown.
View 2 Replies View RelatedSince the query that comprises my ListView basically gets the rowID, name, and a third column from my databases's table, I want to be able to filter the cursor based on the partial value of the name column. However, I am uncertain of whether I can do this directly from runQuery without expanding my DB class since I want to filter the existing cursor, or will I have to create a new query function in my DB class that partially searches my name column, and if so, how would I go about creating the query statement while using the CharSequence constraint argument in runQuery?I am also concerned about the performance issues associated with trying to run multiple queries based on partial text since the DB table in question has about 1300-1400 rows. In other words, would I run into a bottleneck trying to filter the cursor?
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