1XXX - Not complete yet!!! 2 3Name 4 5 SGIX_scalebias_hint 6 7Name Strings 8 9 GL_SGIX_scalebias_hint 10 11Contact 12 13 SGI 14 15Status 16 17 XXX - Not complete yet!!! 18 19Version 20 21 $Date$ 22 23Number 24 25 236 26 27Dependencies 28 29 None 30 31Overview 32 33 This extension adds an precision hint for scaling and biasing 34 arithmetic. For large scale factors, hinting GL_NICEST produces the 35 most accurate results. The hint only applies to Octane2 VPro 36 graphics systems, to work around a hardware issue. 37 38New Procedures and Functions 39 40 None 41 42New Tokens 43 44 Accepted by the <target> parameter of glHint and by the <pname> 45 parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev: 46 47 SCALEBIAS_HINT_SGIX 0x8322 48 49Additions to Chapter 2 of the 1.1 Specification (OpenGL Operation) 50 51 None 52 53Additions to Chapter 3 of the 1.1 Specification (Rasterization) 54 55 None 56 57Additions to Chapter 4 of the 1.1 Specification (Fragments and the 58Frame Buffer) 59 60 None 61 62Additions to Chapter 5 of the 1.1 Specification (Special Functions) 63 64 Add to section 5.6 ("Hints"): 65 66 If the <target> argument of Hint is specified as SCALEBIAS_HINT, 67 then the <hint> argument indicates the desired precision of 68 geometric transformations around the near clip plane (XXX - is this 69 really what's going on?). The NICEST hint trades off performance for 70 increased clip accuracy. 71 72Additions to Chapter 6 of the 1.1 Specification (State and State Requests) 73 74 None 75 76Additions to the GLX Specification 77 78 None 79 80GLX Protocol 81 82 None 83 84Errors 85 86 None 87 88New State 89 90 Get Value Get Command Type Value Attrib 91 --------- ----------- ---- ------- ------ 92 SCALEBIAS_HINT_SGIX GetIntegerv Z3 DONT_CARE hint 93 94New Implementation Dependent State 95 96 None 97