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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>ps_2_sw</B> - Direct3D Software Shader for Model 2.0 Extended fragment profile
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> ps_2_sw
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This Direct3D profile corresponds to the per-fragment 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 Pixel 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 a reference device.
</P>
<P>
This profile generates code assuming the following Direct3D 9 pixel 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>ps_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>
<P>
The varying input semantics in the <B>ps_2_sw</B> profile correspond to the
respectively named varying output semantics of the <B>vs_2_sw</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
</PRE>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="9">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="10">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="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="vs_2_sw.html">vs_2_sw</A>,
<A HREF="ps_2_x.html">ps_2_x</A>
</P>
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