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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>gs_4_0</B> - Translation profile to DirectX 10's High Level Shader Language for geometry shaders.
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> gs_4_0
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This Direct3D profile translates Cg into DirectX 10's High Level Shader
Language (HLSL10) for geometry shaders.
</P>
<P>
The compiler output for this profile conforms to the textual high-level
language defined by DirectX 10's High Level Shading Language.
</P>
<P>
The limitations of the <B>gs_4_0</B> profile depend on what HLSL profile to
which the translated HLSL code is compiled.
</P>
<H1><A NAME="3D_API_DEPENDENCIES"><A NAME="4">3D API DEPENDENCIES
</A></A></H1>
<P>
Requires Direct3D 10 support.
</P>
<PRE> <A HREF="http://msdn.microsoft.com/en-us/library/bb509657.aspx">msdn.microsoft.com/en-us/library/bb509657.aspx</A>
</PRE>
<H1><A NAME="PROFILE_OPTIONS"><A NAME="5">PROFILE OPTIONS
</A></A></H1>
<P>
-po pad16
This will add padding variables to the cbuffer declarations to match
the 16 byte padding the GP4 OpenGL profiles use. This makes sure
each variable in the cbuffer uses an entire float4 constant instead
of the tight packing HLSL10 normally uses.
</P>
<H1><A NAME="DATA_TYPES"><A NAME="6">DATA TYPES
</A></A></H1>
<P>
In general, the Cg data types translate to the HLSL10 data types with the
same name.
</P>
<DL>
<DT><STRONG>float, half, fixed
</STRONG></DT>
<DD>
<P>
These numeric data types all correspond to 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>
<DT><STRONG>int
</STRONG></DT>
<DD>
<P>
This integral data type operates like an integer over the -2^24 to 2^24 range.
The result of int by int division is an integer (rounding down) to match C.
</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>gs_4_0</B> profile correspond to the
respectively named varying output semantics of the <B>vs_4_0</B> profile.
</P>
<PRE> Binding Semantics Name Corresponding Data
POSITION Object-space position (SV_Position)
NORMAL Object-space normal
COLOR Primary color (float4) (SV_Target)
COLOR0
DIFFUSE
COLOR1 Secondary color (float4)
SPECULAR
FOGCOORD Fog coordinate
TEXCOORD# Texture coordinate set #
</PRE>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="9">UNIFORM INPUT SEMANTICS
</A></A></H2>
<H2><A NAME="OUTPUT_SEMANTICS"><A NAME="10">OUTPUT SEMANTICS
</A></A></H2>
<PRE> Binding Semantics Name Corresponding Data
POSITION Clip-space position (SV_Position)
HPOS
COLOR Front primary color (SV_Target)
COLOR0
COL0
COL
COLOR1 Front secondary color
COL1
TEXCOORD# Texture coordinate set #
TEX# TEX# is translated to TEXCOORD#
FOGC Fog coordinate
FOG
PSIZE Point size
PSIZ
</PRE>
<H1><A NAME="STANDARD_LIBRARY_ISSUES"><A NAME="11">STANDARD LIBRARY ISSUES
</A></A></H1>
<P>
This profile is limited to standard library support available in HLSL10 for vertex shaders.
In general, the Cg and HLSL10 standard libraries are very similar.
</P>
<H1><A NAME="SEE_ALSO"><A NAME="12">SEE ALSO
</A></A></H1>
<P>
<A HREF="vs_4_0.html">vs_4_0</A>,
<A HREF="ps_4_0.html">ps_4_0</A>
</P>
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