fp40.3Cg

Langue: en

Version: Cg Toolkit 3.0 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

fp40 - OpenGL fragment profile for NVIDIA GeForce 6/7 Series, NV4x-based Quadro FX

SYNOPSIS

   fp40

DESCRIPTION

This OpenGL profile corresponds to the per-fragment functionality introduced by the GeForce 6800 and other NV4x-based NVIDIA GPUs.

The compiler output for this profile conforms to the assembly format defined by NV_fragment_program2.

Data-dependent loops are allowed with a limit of 256 iterations maximum. Four levels of nesting are allowed.

Conditional expressions can be supported with data-dependent branching.

Relative indexing of uniform arrays is not supported; use texture accesses instead.

3D API DEPENDENCIES

Requires OpenGL support for the NV_fragment_program2 extension. These extensions were introduced by the GeForce 6800 and other NV4x-based GPUs.

OpenGL Extension Specifications

  http://www.opengl.org/registry/specs/NV/fragment_program2.txt

PROFILE OPTIONS

None.

DATA TYPES

fixed
The fixed data type corresponds to a native signed fixed-point integers with the range [-2.0,+2.0), sometimes called fx12. This type provides 10 fractional bits of precision.
half
The half data type corresponds to a floating-point encoding with a sign bit, 10 mantissa bits, and 5 exponent bits (biased by 16), sometimes called s10e5.
float
The half data type corresponds to a standard IEEE 754 single-precision floating-point encoding with a sign bit, 23 mantissa bits, and 8 exponent bits (biased by 128), sometimes called s10e5.

SEMANTICS


VARYING INPUT SEMANTICS

The varying input semantics in the fp40 profile correspond to the respectively named varying output semantics of the vp40 profile.

   Binding Semantics Name           Corresponding Data
  
   COLOR                            Input primary color
   COLOR0
   COL
   COL0
  
   COLOR1                           Input secondary color
   COL1   
  
   TEX0                             Input texture coordinate sets 0
   TEXCOORD0
 
   TEX1                             Input texture coordinate sets 1
   TEXCOORD1
 
   TEX2                             Input texture coordinate sets 2
   TEXCOORD2
 
   TEX3                             Input texture coordinate sets 3
   TEXCOORD3
  
   TEX4                             Input texture coordinate sets 4
   TEXCOORD4
  
   TEX5                             Input texture coordinate sets 5
   TEXCOORD5
  
   TEX6                             Input texture coordinate sets 6
   TEXCOORD6
 
   TEX7                             Input texture coordinate sets 7
   TEXCOORD7
  
   FOGP                             Input fog color (XYZ) and factor (W)
   FOG
 
   FACE                             Polygon facing.
                                    +1 for front-facing polygon or line or point
                                    -1 for back-facing polygon

UNIFORM INPUT SEMANTICS

Sixteen texture units are supported:

   Binding Semantic Name            Corresponding Data
 
   TEXUNIT0                         Texture unit 0
   TEXUNIT1                         Texture unit 1
   ...
   TEXUNIT15                        Texture unit 15

OUTPUT SEMANTICS

   COLOR                            Output color (float4)
   COLOR0
   COL0
   COL
  
   DEPTH                            Output depth (float)
   DEPR

STANDARD LIBRARY ISSUES

Functions that compute partial derivatives are supported.

SEE ALSO

vp40