[android-developers] Re: Transparent textures in OpenGL ES.. How?
Part of my texture loading code looks like this:
final Bitmap bitmap =
BitmapFactory.decodeResource(context.getResources(), resId);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
Following lines should be somewhere in initialization:
// Blending Function For Translucency Based On Source Alpha Value
gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE);
gl.glEnable(GL10.GL_BLEND);
On Jun 21, 9:30 pm, Navigateur wrote:
> I got it working! The right data order is ARGB, but it just wasn't
> accepting my original data for some reason (even though the data is
> fine)... so by writing it, pixel by pixel, to a new Bitmap.. it works
> (that's why RGBA version was treating the "A" as "B") Can anyone tell
> me why I have to write a new Bitmap (it's a waste of processing). Does
> the Bitmap have to be "mutable" or something?
>
> On Jun 21, 6:13 pm, Navigateur wrote:
>
>
>
> > Correction: if I use the original ARGB format of the .png without
> > converting it to RGBA, it doesn't work at all. (But with RGBA it has
> > the problem as stated).
>
> > On Jun 21, 5:30 pm, Navigateur wrote:
>
> > > I should add, maybe GL10's glTexImage2D is the way to go here but I
> > > can't get that working at all. Maybe I have the pixel buffer pixels in
> > > the wrong order, since I use Bitmap's copyPixelsToBuffer to create the
> > > pixels buffer (what's the correct ordering for pixels in this buffer)?
> > > Or is GLUtils.texImage2D is the best one to call?
>
> > > On Jun 21, 4:57 pm, Navigateur wrote:
>
> > > > 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_);
>
> > > > 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 have no idea why but I'll keep trying, but has anybody done
> > > > this properly and has the answer?- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> > - Show quoted text -
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[android-developers] Re: Transparent textures in OpenGL ES.. How?
I got it working! The right data order is ARGB, but it just wasn't
accepting my original data for some reason (even though the data is
fine)... so by writing it, pixel by pixel, to a new Bitmap.. it works
(that's why RGBA version was treating the "A" as "B") Can anyone tell
me why I have to write a new Bitmap (it's a waste of processing). Does
the Bitmap have to be "mutable" or something?
On Jun 21, 6:13 pm, Navigateur wrote:
> Correction: if I use the original ARGB format of the .png without
> converting it to RGBA, it doesn't work at all. (But with RGBA it has
> the problem as stated).
>
> On Jun 21, 5:30 pm, Navigateur wrote:
>
>
>
> > I should add, maybe GL10's glTexImage2D is the way to go here but I
> > can't get that working at all. Maybe I have the pixel buffer pixels in
> > the wrong order, since I use Bitmap's copyPixelsToBuffer to create the
> > pixels buffer (what's the correct ordering for pixels in this buffer)?
> > Or is GLUtils.texImage2D is the best one to call?
>
> > On Jun 21, 4:57 pm, Navigateur wrote:
>
> > > 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_);
>
> > > 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 have no idea why but I'll keep trying, but has anybody done
> > > this properly and has the answer?- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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[android-developers] Re: Transparent textures in OpenGL ES.. How?
Correction: if I use the original ARGB format of the .png without
converting it to RGBA, it doesn't work at all. (But with RGBA it has
the problem as stated).
On Jun 21, 5:30 pm, Navigateur wrote:
> I should add, maybe GL10's glTexImage2D is the way to go here but I
> can't get that working at all. Maybe I have the pixel buffer pixels in
> the wrong order, since I use Bitmap's copyPixelsToBuffer to create the
> pixels buffer (what's the correct ordering for pixels in this buffer)?
> Or is GLUtils.texImage2D is the best one to call?
>
> On Jun 21, 4:57 pm, Navigateur wrote:
>
>
>
> > 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_);
>
> > 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 have no idea why but I'll keep trying, but has anybody done
> > this properly and has the answer?- Hide quoted text -
>
> - Show quoted text -
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[android-developers] Re: Transparent textures in OpenGL ES.. How?
I should add, maybe GL10's glTexImage2D is the way to go here but I
can't get that working at all. Maybe I have the pixel buffer pixels in
the wrong order, since I use Bitmap's copyPixelsToBuffer to create the
pixels buffer (what's the correct ordering for pixels in this buffer)?
Or is GLUtils.texImage2D is the best one to call?
On Jun 21, 4:57 pm, Navigateur wrote:
> 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_);
>
> 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 have no idea why but I'll keep trying, but has anybody done
> this properly and has the answer?
--
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[android-developers] Re: transparent textures...
On Feb 15, 2:23 pm, petunio wrote: > Hi all > I am using opengl for drawing 3d stuff, but so far I've been unable to > use transparent textures... You need at least: gl.glEnable(GL10.GL_BLEND); and probably also: gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); gl.glTexEnvx(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_REPLACE); -- Jon --~--~-~--~~~---~--~~ 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: Transparent textures in OpenGL
Did you use GL10.GL_MODULATE? gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, //GL10.GL_REPLACE GL10.GL_MODULATE ); I had the same problem before and it's fixed after making the above change. --- On Mon, 12/29/08, Chris McCurdy wrote: From: Chris McCurdy Subject: [android-developers] Transparent textures in OpenGL To: "Android Developers" Date: Monday, December 29, 2008, 7:34 AM I'm currently attempting to make a game using OpenGL and all is well in the emulator. I'm using PNGs with transparencies to create the textures, and in the emulator, they show up as expected. But when I run it on the G1, all transparent areas show up as black. I've seen some reports that I need to change the texture from ARGB to RGBA, but that made my image really small and gave me 4 of the same image (like it separated each color of the texture into its own image). I've also seen a suggestion to disable GL_LIGHTING, but that didn't help either. Is there anything I can do to actually get transparencies to show up as transparent on the G1? --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
