Android :: Using GlColor To Set Textures To Half Transparency?
Nov 19, 2010
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.
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Feb 21, 2010
I'm trying to create a drawable in xml, a rectangle with one gradient on the top half, and another on the bottom half.
This is NOT the way to do it, apparently:
CODE:................
How can I do this, preferably in a way that makes it stretchable to any height?
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Oct 15, 2009
I used my Hero this morning/afternoon with music, wi-fi, internet browsing, and I used up the first half of the battery. And after that, I have been mostly studying and not using my phone... but the second half of the batter drains, it seems like, FASTER than the first half did! No music playing, no wi-fi, no internet browsing? Is this normal? Is it just the nature of these batteries?
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Feb 23, 2010
why is it when i hit the volume rocker on the side, it only goes half way? i mean, its still loud as hell, but still. Even the Alarm volume only goes half way.
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May 27, 2009
I am rendering this PNG with no transparency just fine: http://n4te.com/temp/test.png However if I try to render this PNG (with transparency) with the exact same code, I just get a white box: http://n4te.com/temp/ball.png
I am loading the PNG into a texture like this: Bitmap bitmap = BitmapFactory.decodeStream(input); int[] temp = new int[1]; gl.glGenTextures(1, temp, 0); textureID = temp[0]; gl.glBindTexture(GL10.GL_TEXTURE_2D, textureID); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST); // GL_LINEAR for quality. gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); bitmap.recycle();
I am using this blending: gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); How is it possible to render a PNG with transparency in OpenGL ES?
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Jul 14, 2010
I would like to change the transparency of a whole View in Android. How can I do that? The View has a nontransparent background.
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Mar 20, 2010
Is there a way to set the Astrid widget to be partially transparent/translucent? I'd like it to let some of the background show through like the default search widget and the default calendar widget.
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Mar 3, 2010
why is the transparency for drawables attached to ImageButtons not honoured? i have to change them to ImageViews so they look right.
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Feb 1, 2010
I need to set initial transparency for a TextView but I don't know how to do it. On iPhone it can be done easily with alpha property. I've tried to set alpha using AlphaAnimation but no good it doesn't work. It just returns to 100% alpha when it ends.
CODE:................
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Apr 2, 2010
I am having problems getting transparency to work well on an ImageView. The images at(http://img265.imageshack.us/img265/6233/whatn.png) were screen captured from a Droid (hdpi). The top image I made in Photoshop and left the background white. The bottom image is the same image with the background transparent and the layout's color (white) shows through. Whenever I have transparent backgrounds in images it dithers shadows like this. Also, it only happens on hdpi devices, on my G1 (mdpi) it looks just fine. What is going on? How can I make the bottom image look as good as the top one?
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Apr 25, 2009
I have a lot of Views where I have set a background image on the top LinearLayout and then I have nested a new linear layout below with a background that is semi-transparent. This works great in 1.1, but in 1.5 the transparency is just disregarded and this breaks my app as the text on top is now unreadable.
Is this a bug or a feature? Is there a better way of doing this? Very grateful for any tips!
Code example:
CODE:....................
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Feb 15, 2009
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:..............
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Feb 17, 2010
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.
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Jun 22, 2009
I have tried to replicate the Transparency/Translucency effects created in the API Demo(which works flawlessly) and the code i wrote works on the emulator but not on my actual device(Google ION)I copied the styles and colors.xml files from the API demos code and set the theme of my activity I want to be transparent to "@style/ Theme.Transparent" in my activity i set my content view to a layout which contains only a TextView containing : <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center_vertical|center_horizontal" android:text="should have transparent background" /> i have also tried setting the theme using: setTheme (R.style.Theme_Transparent).
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Oct 17, 2009
Anyone know if you can make part (i.e. a section which you could measure in pixels) of an image transparent? What graphics features would I need to look at?
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Apr 4, 2010
To explain i have a bitmap which is constructed as follows
Paint a rectangle color yellow I want now to paint a smaller circle over the top of the rectangle, but i want to use transparency. so that the circle results as a hole in the rectangle. {like swiss cheese with holes }
So if i painted the bitmap over a background the background would still be visible in the Circle/hole.
setting the drawcolor drawColor(Color.TRANSPARENT) just paints a transparent object. i.e. it doesn't erase the circle area of the rectangle.
How to do...?
One option is to set the circle color to say black and then look for an option to replace black with transparent within the bitmap.... but i can't find a solution for this either.
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Jun 21, 2010
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).
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Sep 27, 2010
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.
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Aug 18, 2010
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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Nov 1, 2010
In 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..
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Feb 19, 2010
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.
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Mar 23, 2010
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?
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May 19, 2010
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:...........................
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Aug 7, 2009
When applying an alpha value to an imageview, Eclipse displays the view accurately in layout mode. But when exporting to a target device (such as a phone), the alpha appears to be ignored. This impacts developers trying to create fade ins/outs of elements in a widget. Has anyone else come across this issue yet? Not sure if this behavior is by design or by error.
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Jul 2, 2009
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).
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Jun 19, 2010
How 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?
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Apr 12, 2010
how 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.
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Jan 30, 2010
So 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?
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Dec 28, 2009
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.
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Dec 5, 2009
I'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?
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