OpenGL - Getting The Display Color Bits

Question

I'm looking at the LWJGL wiki for taking a screenshot (found here) and I noticed the comment Assuming a 32-bit display with a byte each for red, green, blue, and alpha. in this code:

GL11.glReadBuffer(GL11.GL_FRONT);
int width = Display.getDisplayMode().getWidth();
int height= Display.getDisplayMode().getHeight();
int bpp = 4; // Assuming a 32-bit display with a byte each for red, green,
//blue, and alpha.
ByteBuffer buffer = BufferUtils.createByteBuffer(width * height * bpp);
GL11.glReadPixels(0, 0, width, height, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer );

How would I change the var bpp based off of the current system?

OpenGL should not be abused for creating screenshots of the system display. You can use it to store the contents of a OpenGL drawable's contents, but the sometimes found technique of creating a fullscreen, bottom layer window to grab a screenshot is highly unreliable. — datenwolf
– datenwolf, Commented May 19, 2013 at 9:36

Quaggles · Accepted Answer · 2013-07-21 23:45:56Z

2

In case you're still looking for an answer:

You can get the bytes per pixel of the current display mode by getting it from LWJGL's Display class. It would look something like this:

int bpp = Display.getDisplayMode().getBitsPerPixel()/4

edited Jul 21, 2013 at 23:45

answered Jun 27, 2013 at 20:08

Quaggles

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