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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>vs_2_sw</B> - Direct3D Software Shader for Model 2.0 Extended vertex profile
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> vs_2_sw
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This Direct3D profile corresponds to the per-vertex functionality
introduced by GeForce FX (NV3x) for DirectX 9.
</P>
<P>
The compiler output for this profile conforms to the textual assembly
defined by the software version of DirectX 9's Vertex Shader 2.0 Extended
shader format. See:
</P>
<PRE> <A HREF="http://msdn.microsoft.com/en-us/library/bb172925.aspx">msdn.microsoft.com/en-us/library/bb172925.aspx</A>
</PRE><P>
This profile is useful for debugging and prototyping.
</P>
<H1><A NAME="3D_API_DEPENDENCIES"><A NAME="4">3D API DEPENDENCIES
</A></A></H1>
<P>
Requires support for software vertex processing and a reference device.
</P>
<P>
This profile generates code assuming the following Direct3D 9 Vertex shader
capability bits are set:
</P>
<PRE> D3DD3DPSHADERCAPS2_0_ARBITRARYSWIZZLE
D3DD3DPSHADERCAPS2_0_GRADIENTINSTRUCTIONS
D3DD3DPSHADERCAPS2_0_PREDICATION
D3DD3DPSHADERCAPS2_0_NODEPENDENTREADLIMIT
D3DD3DPSHADERCAPS2_0_NOTEXINSTRUCTIONLIMIT
</PRE>
<H1><A NAME="PROFILE_OPTIONS"><A NAME="5">PROFILE OPTIONS
</A></A></H1>
<DL>
<DT><STRONG>NumTemps=<I>val</I>
</STRONG></DT>
<DD>
<P>
Number of 4-component vector temporaries the target implementation supports.
</P>
<DT><STRONG>NumInstructionSlots=<I>val</I>
</STRONG></DT>
<DD>
<P>
Number of instructions the target implementation supports.
</P>
<DT><STRONG>MaxDrawBuffers=<I>val</I>
</STRONG></DT>
<DD>
<P>
Number of draw buffers or Multiple Render Targets (MRT) the target
implementation supports.
</P>
</DD></DL>
<H1><A NAME="DATA_TYPES"><A NAME="6">DATA TYPES
</A></A></H1>
<DL>
<DT><STRONG>half
</STRONG></DT>
<DD>
<P>
The <B>half</B> data type makes use of the Partial Precision instruction modifier
to request less precision.
</P>
<P>
NVIDIA GPUs may use half-precision floating-point when the Partial
Precision instruction modifier is specified. Half-precision
floating-point is encoded 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>float</B> data type corresponds to a floating-point representation
with at least 24 bits.
</P>
<P>
NVIDIA GPUs supporting <B>vs_2_sw</B> use 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>
<P>
Older ATI GPUs use 24-bit floating-point.
</P>
<DT><STRONG>fixed
</STRONG></DT>
<DD>
<P>
The <B>fixed</B> data type is treated like <B>half</B>.
</P>
</DD></DL>
<H1><A NAME="SEMANTICS"><A NAME="7">SEMANTICS
</A></A></H1>
<H2><A NAME="INPUT_SEMANTICS"><A NAME="8">INPUT SEMANTICS
</A></A></H2>
<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
</PRE>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="9">UNIFORM INPUT SEMANTICS
</A></A></H2>
<P>
Eight texture units are supported:
</P>
<PRE> Binding Semantic Name Corresponding Data
TEXUNIT0 Texture unit 0
TEXUNIT1 Texture unit 1
...
TEXUNIT7 Texture unit 7
</PRE>
<H2><A NAME="OUTPUT_SEMANTICS"><A NAME="10">OUTPUT SEMANTICS
</A></A></H2>
<PRE> Binding Semantics Name Corresponding Data
POSITION, HPOS Output position
PSIZE, PSIZ Output point size
FOG, FOGC Output fog coordinate
COLOR0, COL0 Output primary color
COLOR1, COL1 Output secondary color
BCOL0 Output backface primary color
BCOL1 Output backface secondary color
TEXCOORD0-TEXCOORD7, Output texture coordinates
TEX0-TEX7
CLP0-CL5 Output Clip distances
</PRE>
<H1><A NAME="STANDARD_LIBRARY_ISSUES"><A NAME="11">STANDARD LIBRARY ISSUES
</A></A></H1>
<P>
Functions that compute partial derivatives are <I>not</I> supported.
</P>
<P>
There are no restrictions on dependent texture reads (up to the
instruction limit) for this profile.
</P>
<H1><A NAME="SEE_ALSO"><A NAME="12">SEE ALSO
</A></A></H1>
<P>
<A HREF="ps_2_sw.html">ps_2_sw</A>,
<A HREF="vs_2_x.html">vs_2_x</A>
</P>
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