32-bit Graphics, getting dithered down to 16-bit?

[Vage]

Hey guys, I just recently made the switch to LWJGL from Java2D and I have to say I love it

Anyway, I'm having a slight problem: My 32-bit graphics are getting dithered down to 16-bit, and then being displayed on my 32-bit screen. Argh! Any ideas?

Example:


I'll try to post any relevent code blocks as well:

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public static QTexture fromFile( String name, boolean flip )    {       QTexture texture = null;       ByteBuffer imageData = null;       int ilImageHandle;       int oglImageHandle;       IntBuffer scratch = BufferUtils.createIntBuffer(1);             try{          IL.create();          ILU.create();          ILUT.create();       } catch (LWJGLException ex) {                 }       // create image in DevIL and bind it      IL.ilGenImages(scratch);       IL.ilBindImage(scratch.get(0));       ilImageHandle = scratch.get(0);             // load the image      if( !IL.ilLoadImage( name ) )          return null;             // convert image to RGBA      IL.ilConvertImage(IL.IL_RGBA, IL.IL_BYTE);             // flip      if( flip )          ILU.iluFlipImage();             // get image attributes      int width = IL.ilGetInteger(IL.IL_IMAGE_WIDTH);       int height = IL.ilGetInteger(IL.IL_IMAGE_HEIGHT);       int textureWidth = QUtil.getNextPowerOfTwo(width);       int textureHeight = QUtil.getNextPowerOfTwo(height);             // resize image according to poweroftwo      if (textureWidth != width || textureHeight != height)       {          imageData = BufferUtils.createByteBuffer(textureWidth * textureHeight * 4);          IL.ilCopyPixels(0, 0, 0, textureWidth, textureHeight, 1, IL.IL_RGBA, IL.IL_BYTE, imageData);       }       else          imageData = IL.ilGetData();             // create OpenGL counterpart      GL11.glGenTextures(scratch);       GL11.glBindTexture(GL11.GL_TEXTURE_2D, scratch.get(0));       oglImageHandle = scratch.get(0);             GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);       GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);       GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, textureWidth, textureHeight, 0, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, imageData);             // Create image (either resized by copying, else directly from IL)      if (textureWidth != width || textureHeight != height)          texture = new QTexture(oglImageHandle, width, height, (width / (float) textureWidth), (height / (float) textureHeight), textureWidth, textureHeight);       else          texture = new QTexture(oglImageHandle, width, height);             // delete Image in DevIL      scratch.put(0, ilImageHandle);       IL.ilDeleteImages(scratch);       IL.destroy();       ILU.destroy();       ILUT.destroy();             // revert the gl state back to the default so that accidental texture binding doesn't occur      GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);             // return OpenGL texture handle      return texture;    }

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public static void drawImage( QTexture tex, int x, int y )    {       if( color[3] == 0 )          return;       // store the current model matrix      GL11.glPushMatrix();             // translate to the right location and prepare to draw      GL11.glTranslatef(x, y, 0);       GL11.glColor4f( color[0], color[1], color[2], color[3] );       if( ra != 0 && ra != 360 )       {          float rx1 = rx - x;          float ry1 = ry - y;          GL11.glTranslatef(rx1, ry1, 0);          GL11.glRotatef( ra, 0, 0, 1 );          GL11.glTranslatef(-rx1, -ry1, 0);       }       GL11.glEnable(GL11.GL_TEXTURE_2D);       GL11.glBindTexture(GL11.GL_TEXTURE_2D, tex.getTextureId() );       GL11.glBegin(GL11.GL_QUADS);       {          GL11.glTexCoord2f( 0, 0 );          GL11.glVertex2f( 0, 0 );                    GL11.glTexCoord2f( tex.getWidthRatio(), 0 );          GL11.glVertex2f( tex.getWidth(), 0 );                    GL11.glTexCoord2f( tex.getWidthRatio(), tex.getHeightRatio() );          GL11.glVertex2f( tex.getWidth(), tex.getHeight() );                    GL11.glTexCoord2f( 0, tex.getHeightRatio() );          GL11.glVertex2f( 0, tex.getHeight() );       }       GL11.glEnd();       GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0 );       GL11.glDisable(GL11.GL_TEXTURE_2D);       // restore the model view matrix to prevent contamination      GL11.glPopMatrix();    }

[oNyx]

Guess#1

IL.ilConvertImage(IL.IL_RGBA, IL.IL_BYTE); <- Remove that line.

Btw you can resample a texture with ILU.iluScale(new_width, new_height, IL.ilGetInteger(IL.IL_IMAGE_DEPTH)) and you get the best quality with ILU.iluImageParameter(ILU.ILU_FILTER, ILU.ILU_SCALE_LANCZOS3).

Guess#2

Check the driver settings.

[Vage]

Hmm, no such luck. I tried both suggestions, reinstalled nVidia drivers as well.
Well, it's not a big deal; But if you guys have any other guesses, please throw 'em at me Thanks anyway!

If I ever find the issue I'll post it here for reference.

Games published by our own members! Check 'em out!

[princec]

Nvidia does have a setting to force textures into 16 bit in the display control panel.
And are you sure you've got a 32bpp context? System.out.println(Display.getDisplayMode()) to be sure, after creation.

Cas

[Vage]

EDIT:

Wow, I blame nVidia totally =D

I changed some driver settings, namely 'Image Quality' , and it magically works. Thanks for that recommendation!

[oNyx]

* oNyx points at guess #2

Told ya

[colesbury]

I think the command ilutEnable(ILUT_OPENGL_CONV); may force nVidia cards to use correct texture format.

See the entry on ILUT_OPENGL_CONV in http://openil.sourceforge.net/tuts/tut_10/

-Sam

[Vage]

Interesting, although I wouldn't want to disable anything on their hardware, so I'll leave it how it is now. Thanks though