Hi all! Is there any possibility to set the calculation precision of vertex/fragment shader (ARB_vertex_program, ARB_fragment_program or OpenGL2)?? In DirectX 9 you can choose between a couple of data types (half float, 24 Bit float, 32 Bit float, ...). Is this possible with OpenGL? Thanks! -------------------------------------------------------- "If it looks good, it is good computer graphics" "If it looks like computer graphics, it is bad computer graphics" Corrail corrail@gmx.at ICQ#59184081 [edited by - Corrail on October 1, 2003 8:50:33 AM]

ARB_fragment_program has a precision hint, but other than this I don''t think there is a way to select precision. There is certainly no

"glFragmentProgramPrecision(GL_32_BIT)"

or similar, OpenGL is designed to hide these details from the application programmer.

NV_fragment_program on the other hand, does allow you to select between 12, 16 and 32 bit precision.