View Full Version : High precision Opengl

05-25-2003, 02:18 AM
Hello. I have read that the new graphic cards are computing internally at a better precision than 8 bit integer (they can even do 32 floating point operations). Also, I have found that DirectX allows setting the format to 32 bit precision (D3DFMT_A32B32G32R32F).

My question is how do I make this available in OpenGl and if it is possible to run vertex or pixel shader programs using this precision AND retrieve the result with the SAME precision.


05-25-2003, 03:24 AM
Look at floating-point buffer extensions(like NV_float_buffer or ATI_float ?? don't remember).
You can then retrieve the texture data via glGetImage as floats.

05-25-2003, 03:38 PM
ARB_Fragment_program has specific floating point requirements. It doesn't go so far as to mandate an IEEE 32-bit float, but it does require values outside the range [-1, 1], and these values can be reasonably large.