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.rm #[ #] #H #V #F C
.IX Title "fp30 Cg"
.TH fp30 Cg "" "Cg Toolkit 2.2" "Cg Profiles"
.UC
.SH "NAME"
\&\fBfp30\fR \- OpenGL fragment profile for NV3x (GeForce \s-1FX\s0, Quadro \s-1FX\s0, etc.)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  fp30
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This OpenGL profile corresponds to the per-fragment functionality
introduced by the GeForce \s-1FX\s0 and Quadro \s-1FX\s0 line of \s-1NVIDIA\s0 GPUs.
.PP
The compiler output for this profile conforms to the assembly format
defined by \fBNV_fragment_program\fR.
.PP
Data-dependent loops are not allowed; all loops must be unrollable.
.PP
Conditional expressions are supported without branching so both conditions
must be evaluated.
.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_program\fR extension.
These extensions were introduced by the GeForce \s-1FX\s0 and Quadro \s-1FX\s0 GPUs.
.Sh "OpenGL Extension Specifications"
.IX Subsection "OpenGL Extension Specifications"
.Vb 1
\& http://www.opengl.org/registry/specs/NV/fragment_program.txt
.Ve
.SH "PROFILE OPTIONS"
.IX Header "PROFILE OPTIONS"
.Ip "NumInstructionSlots=\fIval\fR" 4
.IX Item "NumInstructionSlots=val"
How many instructions the compiler should assume it can use.
.Ip "NumTemps=\fIval\fR" 4
.IX Item "NumTemps=val"
How many temporaries the compiler should assume it can use.
.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 \fBfloat\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
.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.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
fp20, fp40, vp30
