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.rm #[ #] #H #V #F C
.IX Title "fp40 Cg"
.TH fp40 Cg "" "Cg Toolkit 1.5" "Cg Profiles"
.UC
.SH "NAME"
\&\fBfp40\fR \- OpenGL fragment profile for NV4x (GeForce 6xxx and 7xxx Series, NV4x-based Quadro \s-1FX\s0, etc.)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  fp40
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This OpenGL profile corresponds to the per-fragment functionality
introduced by the GeForce 6800 and other NV4x-based \s-1NVIDIA\s0 GPUs.
.PP
The compiler output for this profile conforms to the assembly format
defined by \fBNV_fragment_program2\fR.
.PP
Data-dependent loops \fIare\fR allowed with a limit of 256 iterations
maximum.  Four levels of nesting are allowed.
.PP
Conditional expressions \fIcan be\fR supported with data-dependent branching.
.PP
Relative indexing of uniform arrays is not supported; use texture
accesses instead.
.SH "3D API DEPENDENCIES"
.IX Header "3D API DEPENDENCIES"
Requires OpenGL support for the \fBNV_fragment_program2\fR extension.  These
extensions were introduced by the GeForce 6800 and other NV4x-based GPUs.
.SH "PROFILE OPTIONS"
.IX Header "PROFILE OPTIONS"
None.
.SH "DATA TYPES"
.IX Header "DATA TYPES"
.Ip "fixed" 8
.IX Item "fixed"
The \fBfixed\fR data type corresponds to a native signed fixed-point integers
with the range [\-2.0,+2.0), sometimes called \fIfx12\fR.  This type provides
10 fractional bits of precision.
.Ip "half" 8
.IX Item "half"
The \fBhalf\fR data type corresponds to a floating-point encoding with a sign bit,
10 mantissa bits, and 5 exponent bits (biased by 16), sometimes called \fIs10e5\fR.
.Ip "float" 8
.IX Item "float"
The \fBhalf\fR data type corresponds to a standard \s-1IEEE\s0 754 single-precision
floating-point encoding with a sign bit, 23 mantissa bits, and 8 exponent
bits (biased by 128), sometimes called \fIs10e5\fR.
.SH "SEMANTICS"
.IX Header "SEMANTICS"
.Sh "\s-1VARYING\s0 \s-1INPUT\s0 \s-1SEMANTICS\s0"
.IX Subsection "VARYING INPUT SEMANTICS"
The varying input semantics in the \fBfp30\fR profile correspond to the
respectively named varying output semantics of the \fBvp30\fR profile.
.PP
.Vb 1
\&  Binding Semantics Name           Corresponding Data
.Ve
.Vb 4
\&  COLOR                            Input primary color
\&  COLOR0
\&  COL
\&  COL0
.Ve
.Vb 2
\&  COLOR1                           Input secondary color
\&  COL1
.Ve
.Vb 2
\&  TEX0                             Input texture coordinate sets 0
\&  TEXCOORD0
.Ve
.Vb 2
\&  TEX1                             Input texture coordinate sets 1
\&  TEXCOORD1
.Ve
.Vb 2
\&  TEX2                             Input texture coordinate sets 2
\&  TEXCOORD2
.Ve
.Vb 2
\&  TEX3                             Input texture coordinate sets 3
\&  TEXCOORD3
.Ve
.Vb 2
\&  TEX4                             Input texture coordinate sets 4
\&  TEXCOORD4
.Ve
.Vb 2
\&  TEX5                             Input texture coordinate sets 5
\&  TEXCOORD5
.Ve
.Vb 2
\&  TEX6                             Input texture coordinate sets 6
\&  TEXCOORD6
.Ve
.Vb 2
\&  TEX7                             Input texture coordinate sets 7
\&  TEXCOORD7
.Ve
.Vb 2
\&  FOGP                             Input fog color (XYZ) and factor (W)
\&  FOG
.Ve
.Vb 3
\&  FACE                             Polygon facing.
\&                                   +1 for front-facing polygon or line or point
\&                                   -1 for back-facing polygon
.Ve
.Sh "\s-1UNIFORM\s0 \s-1INPUT\s0 \s-1SEMANTICS\s0"
.IX Subsection "UNIFORM INPUT SEMANTICS"
Sixteen texture units are supported:
.PP
.Vb 1
\&  Binding Semantic Name            Corresponding Data
.Ve
.Vb 4
\&  TEXUNIT0                         Texture unit 0
\&  TEXUNIT1                         Texture unit 1
\&  ...
\&  TEXUNIT15                        Texture unit 15
.Ve
.Sh "\s-1OUTPUT\s0 \s-1SEMANTICS\s0"
.IX Subsection "OUTPUT SEMANTICS"
.Vb 4
\&  COLOR                            Output color (float4)
\&  COLOR0
\&  COL0
\&  COL
.Ve
.Vb 2
\&  DEPTH                            Output depth (float)
\&  DEPR
.Ve
.SH "STANDARD LIBRARY ISSUES"
.IX Header "STANDARD LIBRARY ISSUES"
Functions that compute partial derivatives \fIare\fR supported.
