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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>fp40</B> - OpenGL fragment profile for NVIDIA GeForce 6/7 Series, NV4x-based Quadro FX
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> fp40
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This OpenGL profile corresponds to the per-fragment functionality
introduced by the GeForce 6800 and other NV4x-based NVIDIA GPUs.
</P>
<P>
The compiler output for this profile conforms to the assembly format
defined by <B>NV_fragment_program2</B>.
</P>
<P>
Data-dependent loops <I>are</I> allowed with a limit of 256 iterations
maximum. Four levels of nesting are allowed.
</P>
<P>
Conditional expressions <I>can be</I> supported with data-dependent branching.
</P>
<P>
Relative indexing of uniform arrays is not supported; use texture
accesses instead.
</P>
<H1><A NAME="3D_API_DEPENDENCIES"><A NAME="4">3D API DEPENDENCIES
</A></A></H1>
<P>
Requires OpenGL support for the <B>NV_fragment_program2</B> extension. These
extensions were introduced by the GeForce 6800 and other NV4x-based GPUs.
</P>
<H2><A NAME="OPENGL_EXTENSION_SPECIFICATIONS"><A NAME="5">OpenGL Extension Specifications
</A></A></H2>
<PRE> <A HREF="http://www.opengl.org/registry/specs/NV/fragment_program2.txt">www.opengl.org/registry/specs/NV/fragment_program2.txt</A>
</PRE>
<H1><A NAME="PROFILE_OPTIONS"><A NAME="6">PROFILE OPTIONS
</A></A></H1>
<P>
None.
</P>
<H1><A NAME="DATA_TYPES"><A NAME="7">DATA TYPES
</A></A></H1>
<DL>
<DT><STRONG>fixed
</STRONG></DT>
<DD>
<P>
The <B>fixed</B> data type corresponds to a native signed fixed-point integers
with the range [-2.0,+2.0), sometimes called <I>fx12</I>. This type provides
10 fractional bits of precision.
</P>
<DT><STRONG>half
</STRONG></DT>
<DD>
<P>
The <B>half</B> data type corresponds to a floating-point encoding with a sign bit,
10 mantissa bits, and 5 exponent bits (biased by 16), sometimes called <I>s10e5</I>.
</P>
<DT><STRONG>float
</STRONG></DT>
<DD>
<P>
The <B>half</B> 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 <I>s10e5</I>.
</P>
</DD></DL>
<H1><A NAME="SEMANTICS"><A NAME="8">SEMANTICS
</A></A></H1>
<H2><A NAME="VARYING_INPUT_SEMANTICS"><A NAME="9">VARYING INPUT SEMANTICS
</A></A></H2>
<P>
The varying input semantics in the <B>fp40</B> profile correspond to the
respectively named varying output semantics of the <B>vp40</B> profile.
</P>
<PRE> 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
</PRE>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="10">UNIFORM INPUT SEMANTICS
</A></A></H2>
<P>
Sixteen texture units are supported:
</P>
<PRE> Binding Semantic Name Corresponding Data
TEXUNIT0 Texture unit 0
TEXUNIT1 Texture unit 1
...
TEXUNIT15 Texture unit 15
</PRE>
<H2><A NAME="OUTPUT_SEMANTICS"><A NAME="11">OUTPUT SEMANTICS
</A></A></H2>
<PRE> COLOR Output color (float4)
COLOR0
COL0
COL
DEPTH Output depth (float)
DEPR
</PRE>
<H1><A NAME="STANDARD_LIBRARY_ISSUES"><A NAME="12">STANDARD LIBRARY ISSUES
</A></A></H1>
<P>
Functions that compute partial derivatives <I>are</I> supported.
</P>
<H1><A NAME="SEE_ALSO"><A NAME="13">SEE ALSO
</A></A></H1>
<P>
<A HREF="vp40.html">vp40</A>
</P>
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