P.S. It turns out the *blur* is from using GL_CLAMP_TO_EDGE. Changing to GL_REPEAT removes the blur even though it doesn't really make sense to repeat the texture as I'm just rendering sprites as quads (triangle pairs).
On Monday, September 2, 2013 6:29:17 PM UTC-7, Jason wrote: > > > On Monday, September 2, 2013 6:23:43 PM UTC-7, Jason wrote: >> >> I realize this is an old thread, but I'm having the same issue and the >> above solutions haven't worked for me. >> >> Firstly the link to the PNGDecoder from libgdx is old and no longer >> exists (libgdx appear to have re-vamped the way they load images and >> tracking down where exactly the PNG decoding happens is a bit of a >> nightmare) >> >> I tried directly calling GLES20.glTexImage2D using the pixels extracted >> from the Bitmap (as described above), but I still get gray artifacts on the >> edges of the texture. >> >> For example: >> >> The top image is the original PNG, the bottom is after rendering (taken >> from screenshot) >> >> >> <https://lh6.googleusercontent.com/-Dyf568n0gD4/UiU4vJP80wI/AAAAAAAACsY/ygEOOrLYBao/s1600/cloud_text_problem.png> >> >> The bottom image has gray pixel artifacts around the edge. It's also >> sort of *blurry* which I can't work out either. >> >> I tried manually decoding the PNG using this: >> >> http://wiki.l33tlabs.org/bin/view/TWL/Using+the+TWL+PNGDecoder >> >> But got the same result. >> >> I'm creating the texture with: >> >> GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, >> GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); >> GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, >> GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); >> GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, >> GLES20.GL_CLAMP_TO_EDGE); >> GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, >> GLES20.GL_CLAMP_TO_EDGE); >> >> My fragment shader is pretty basic, just multiplies the texture color by >> a couple of other color values I pass in: >> >> gl_FragColor = texture2D(u_Texture, v_TexCoordinate) * u_Color * v_Color; >> >> Does anyone have a clue as to: >> >> 1) How I can render/create the texture without the artifacts >> 2) Why the texture is kind of blurry once it's rendered. >> >> Thanks! >> >> >> On Sunday, September 2, 2012 11:43:59 AM UTC-7, arberg wrote: >>> >>> Hi, >>> >>> I think it would make sense that either Bitmap could be without >>> premultiplied alpha, or GLUtils.texImage2D method could take as parameter >>> whether to load with or without premultiplied alpha. Since you say Bitmaps >>> will never be without premultiplied alpa, I suggest the latter, plus as you >>> suggest a convenience method on the Bitmap, which returns its content in an >>> array without premultiplied alpha. >>> >>> It makes sense to me to add the option to GLUtils.texImage2D since the >>> very purpose of the GLUtils class is '... to help bridging OpenGL ES and >>> Android APIs.' (javadoc class reference). >>> >>> Cheers Alex >>> >>> On Friday, 29 June 2012 21:18:59 UTC+2, Romain Guy (Google) wrote: >>>> >>>> Another big issue similar to alpha-premultiply is that 32Bit ARGB >>>>> Images are changed >>>>> to 16Bit after scaling (especially if all alpha values are 255), >>>>> without some dirty tricks. >>>>> This is a big issue to, it's far away from the precission needed for >>>>> good normal mapping. >>>>> >>>> >>>> There was a bug in the scaling code that I fixed. a 32 bits image will >>>> now always be scaled to another 32 bits image. >>>> >>>> >>>>> >>>>> -- >>>> Romain Guy >>>> Android framework engineer >>>> [email protected] >>>> >>>> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
