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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>gp4vp</B> - OpenGL vertex profile for NVIDIA GeForce 8/9/100/200/300 Series, OpenGL 3.x Quadro
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> gp4vp
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This OpenGL profile corresponds to the per-vertex functionality
introduced by NVIDIA's 4th generation of assembly instruction sets.
</P>
<P>
The compiler output for this profile conforms to the assembly format
defined by <B>NV_gpu_program4</B> and <B>ARB_vertex_program</B>.
</P>
<P>
Note that the <B>NV_gpu_program4</B> extension has its vertex domain-specific
aspects documented in the <B>NV_vertex_program4</B> specification.
</P>
<P>
Data-dependent loops and branching <I>are</I> allowed.
</P>
<P>
Relative indexing of uniform arrays <I>is</I> supported.
</P>
<P>
Texture accesses are supported. While the prior <B>vp40</B> profile has substantial
limitations on vertex texturing, the <B>gp4vp</B> profile eliminates all
the limitations.
</P>
<P>
Texture accesses include support for texture arrays (see the
<B>EXT_texture_array</B> OpenGL extension for more details) and texture buffer
objects (see the <B>EXT_texture_buffer_object</B> extension for details).
Texture results can be either conventional floating-point vectors or
integer vectors (see the <B>EXT_texture_integer</B> extension for details).
</P>
<H1><A NAME="3D_API_DEPENDENCIES"><A NAME="4">3D API DEPENDENCIES
</A></A></H1>
<P>
Requires OpenGL support for the <B>NV_gpu_program4</B> extension. This
extension was introduced by the GeForce 8800 and other G8x-based GPUs.
</P>
<H2><A NAME="OPENGL_EXTENSION_SPECIFICATIONS"><A NAME="5">OpenGL Extension Specifications
</A></A></H2>
<P>
Programmability:
</P>
<PRE> <A HREF="http://www.opengl.org/registry/specs/NV/gpu_program4.txt">www.opengl.org/registry/specs/NV/gpu_program4.txt</A>
<A HREF="http://www.opengl.org/registry/specs/NV/vertex_program4.txt">www.opengl.org/registry/specs/NV/vertex_program4.txt</A>
</PRE><P>
New texture samplers:
</P>
<PRE> <A HREF="http://www.opengl.org/registry/specs/EXT/texture_array.txt">www.opengl.org/registry/specs/EXT/texture_array.txt</A>
<A HREF="http://www.opengl.org/registry/specs/EXT/texture_buffer_object.txt">www.opengl.org/registry/specs/EXT/texture_buffer_object.txt</A>
</PRE><P>
New integer texture formats:
</P>
<PRE> <A HREF="http://www.opengl.org/registry/specs/EXT/texture_integer.txt">www.opengl.org/registry/specs/EXT/texture_integer.txt</A>
</PRE>
<H1><A NAME="PROFILE_OPTIONS"><A NAME="6">PROFILE OPTIONS
</A></A></H1>
<H2><A NAME="COMMON_GP4_OPTIONS"><A NAME="7">Common GP4 Options
</A></A></H2>
<DL>
<DT><STRONG>fastimul
</STRONG></DT>
<DD>
<P>
Assume integer multiply inputs have at most 24 significant bits. Example: "-po fastimul"
</P>
</DD></DL>
<H1><A NAME="DATA_TYPES"><A NAME="8">DATA TYPES
</A></A></H1>
<H2><A NAME="SAMPLERS"><A NAME="9">Samplers
</A></A></H2>
<P>
This profile has additional samplers for texture arrays (1D and 2D)
and texture buffers.
</P>
<P>
Standard OpenGL textures formats (GL_RGBA8, etc.) return floating-point
sampled results, but new signed and unsigned integer texture formats
require samplers the return signed and unsigned integer vectors
respectively. Sampler variants for fetching signed and unsigned integer
vectors are prefixed by <B>i</B> and <B>u</B> respectively. Your application is
required to make sure the bound textures have the appropriate texture
format. So a 3D texture specified with the GL_RGBA32UI_EXT internal
format (see the <B>EXT_texture_integer</B> OpenGL extension) must be used with
a <B>usampler3D</B> sampler. Otherwise, texture sampling returns undefined
results.
</P>
<DL>
<DT><STRONG>sampler1D
</STRONG></DT>
<DD>
<P>
1D texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D</B> target.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isampler1D
</STRONG></DT>
<DD>
<P>
1D texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D</B> target.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usampler1D
</STRONG></DT>
<DD>
<P>
1D texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D</B> target.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>sampler1DARRAY
</STRONG></DT>
<DD>
<P>
1D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isampler1DARRAY
</STRONG></DT>
<DD>
<P>
1D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usampler1DARRAY
</STRONG></DT>
<DD>
<P>
1D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_1D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>sampler2D
</STRONG></DT>
<DD>
<P>
2D texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D</B> target.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isampler2D
</STRONG></DT>
<DD>
<P>
2D texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D</B> target.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usampler2D
</STRONG></DT>
<DD>
<P>
2D texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D</B> target.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>sampler2DARRAY
</STRONG></DT>
<DD>
<P>
2D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isampler2DARRAY
</STRONG></DT>
<DD>
<P>
2D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usampler2DARRAY
</STRONG></DT>
<DD>
<P>
2D array texture unit corresponding to OpenGL's <B>GL_TEXTURE_2D_ARRAY_EXT</B> target provided by the <B>EXT_texture_array</B> extension.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>sampler3D
</STRONG></DT>
<DD>
<P>
3D texture unit corresponding to OpenGL's <B>GL_TEXTURE_3D</B> target.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isampler3D
</STRONG></DT>
<DD>
<P>
3D texture unit corresponding to OpenGL's <B>GL_TEXTURE_3D</B> target.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usampler3D
</STRONG></DT>
<DD>
<P>
3D texture unit corresponding to OpenGL's <B>GL_TEXTURE_3D</B> target.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>samplerCUBE
</STRONG></DT>
<DD>
<P>
Cube map texture unit corresponding to OpenGL's <B>GL_TEXTURE_CUBE_MAP</B> target.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isamplerCUBE
</STRONG></DT>
<DD>
<P>
Cube map texture unit corresponding to OpenGL's <B>GL_TEXTURE_CUBE_MAP</B> target.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usamplerCUBE
</STRONG></DT>
<DD>
<P>
Cube map texture unit corresponding to OpenGL's <B>GL_TEXTURE_CUBE_MAP</B> target.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>samplerRECT
</STRONG></DT>
<DD>
<P>
Rectangle texture unit corresponding to OpenGL's <B>GL_TEXTURE_RECTANGLE_ARB</B> target.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isamplerRECT
</STRONG></DT>
<DD>
<P>
Rectangle texture unit corresponding to OpenGL's <B>GL_TEXTURE_RECTANGLE_ARB</B> target.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>isamplerRECT
</STRONG></DT>
<DD>
<P>
Rectangle texture unit corresponding to OpenGL's <B>GL_TEXTURE_RECTANGLE_ARB</B> target.
Sampling returns <B>unsigned int</B> vectors.
</P>
<DT><STRONG>samplerBUF
</STRONG></DT>
<DD>
<P>
Buffer texture unit corresponding to OpenGL's <B>GL_TEXTURE_BUFFER_EXT</B> target provided by the <B>EXT_texture_buffer_object</B> extension.
Sampling returns <B>float</B> vectors.
</P>
<DT><STRONG>isamplerBUF
</STRONG></DT>
<DD>
<P>
Buffer texture unit corresponding to OpenGL's <B>GL_TEXTURE_BUFFER_EXT</B> target provided by the <B>EXT_texture_buffer_object</B> extension.
Sampling returns <B>int</B> vectors.
</P>
<DT><STRONG>usamplerBUF
</STRONG></DT>
<DD>
<P>
Buffer texture unit corresponding to OpenGL's <B>GL_TEXTURE_BUFFER_EXT</B> target provided by the <B>EXT_texture_buffer_object</B> extension.
Sampling returns <B>unsigned int</B> vectors.
</P>
</DD></DL>
<H2><A NAME="FLOATING-POINT"><A NAME="10">Floating-point
</A></A></H2>
<DL>
<DT><STRONG>float
</STRONG></DT>
<DD>
<P>
32-bit IEEE floating-point
</P>
<DT><STRONG>half
</STRONG></DT>
<DD>
<P>
32-bit IEEE floating-point
</P>
<DT><STRONG>double
</STRONG></DT>
<DD>
<P>
32-bit IEEE floating-point
</P>
<DT><STRONG>fixed
</STRONG></DT>
<DD>
<P>
Floating-point restricted to [-2,2) range.
</P>
</DD></DL>
<H2><A NAME="INTEGER"><A NAME="11">Integer
</A></A></H2>
<P>
This profile supports "true" integer data types. Shifting and bitwise operators are supported for integer data types.
</P>
<DL>
<DT><STRONG>int
</STRONG></DT>
<DD>
<P>
32-bit signed integer
</P>
<DT><STRONG>unsigned int
</STRONG></DT>
<DD>
<P>
32-bit unsigned integer
</P>
<DT><STRONG>short
</STRONG></DT>
<DD>
<P>
16-bit signed integer
</P>
<DT><STRONG>unsigned short
</STRONG></DT>
<DD>
<P>
16-bit unsigned integer
</P>
<DT><STRONG>char
</STRONG></DT>
<DD>
<P>
8-bit signed integer
</P>
<DT><STRONG>unsigned char
</STRONG></DT>
<DD>
<P>
8-bit unsigned integer
</P>
</DD></DL>
<H1><A NAME="SEMANTICS"><A NAME="12">SEMANTICS
</A></A></H1>
<H2><A NAME="VARYING_INPUT_SEMANTICS"><A NAME="13">VARYING INPUT SEMANTICS
</A></A></H2>
<H3><A NAME="VERTEX_ATTRIBUTE_INPUT_SEMANTICS"><A NAME="14">Vertex Attribute Input Semantics
</A></A></H3>
<P>
For geometry shader profiles such as gp4gp, varying parameters with
vertex attribute input semantics must be declared with the <B>AttribArray</B>
template-style syntax because a geometry shader accepts an attribute
array of vertex attributes (rather than individual vertex attributes as
a vertex shader does).
</P>
<P>
Example defining a varying parameter for the position vertex attribute:
</P>
<PRE> AttribArray<float4> position : POSITION
</PRE><P>
The set of binding semantics for varying input vertex attributes to gp4gp
consists of POSITION, BLENDWEIGHT, NORMAL, COLOR0, COLOR1, TESSFACTOR,
PSIZE, BLENDINDICES, and TEXCOORD0-TEXCOORD7. One can also use TANGENT
and BINORMAL instead of TEXCOORD6 and TEXCOORD7.
</P>
<P>
Additionally, a set of binding semantics ATTR0-ATTR15 can be used. These
binding semantics map to <B>NV_gpu_program4</B> input attribute parameters as
described in the <B>NV_geometry_program4</B> document.
</P>
<P>
The two sets act as aliases to each other on NVIDIA GPUs excluding Apple
Macs. ATI GPUs and NVIDIA Mac GPUs do <I>not</I> alias the conventional
vertex attributes with the generic attributes.
</P>
<PRE> Binding Semantics Name Corresponding Data
POSITION, ATTR0 Input Vertex, Generic Attribute 0
BLENDWEIGHT, ATTR1 Input vertex weight, Generic Attribute 1
NORMAL, ATTR2 Input normal, Generic Attribute 2
DIFFUSE, COLOR0, ATTR3 Input primary color, Generic Attribute 3
SPECULAR, COLOR1, ATTR4 Input secondary color, Generic Attribute 4
TESSFACTOR, FOGCOORD, ATTR5 Input fog coordinate, Generic Attribute 5
PSIZE, ATTR6 Input point size, Generic Attribute 6
BLENDINDICES, ATTR7 Generic Attribute 7
TEXCOORD0-TEXCOORD7, Input texture coordinates (texcoord0-texcoord7)
ATTR8-ATTR15 Generic Attributes 8-15
TANGENT, ATTR14 Generic Attribute 14
BINORMAL, ATTR15 Generic Attribute 15
VERTEXID Input vertex ID (integer)
Vertex index when using vertex arrays
INSTANCEID Integer instance ID of the primitive
within the current batch
</PRE><P>
These vertex attribute semantics should match with the semantics of the
outputs of the vertex shader feeding the geometry shader.
</P>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="15">UNIFORM INPUT SEMANTICS
</A></A></H2>
<H3><A NAME="BUFFER_SEMANTICS"><A NAME="16">Buffer Semantics
</A></A></H3>
<P>
<A HREF="gp4.html">gp4</A> profiles can specify that uniforms be specified to reside within
binable buffers.
</P>
<P>
Example of automatic, compiler-determined specification of a uniform's
location within a buffer:
</P>
<PRE> uniform float2 location : BUFFER[3]; // compiler positions within buffer 3
uniform float4 brickColor : BUFFER[3]; // compiler positions within buffer 3
</PRE><P>
Example of absolute byte offset specification of a uniform's locaiton
within a buffer:
</P>
<PRE> uniform float4 mustBeHere : BUFFER[7][20]; // locate 20 bytes into buffer 7
</PRE>
<H3><A NAME="CONSTANT_REGISTER_SEMANTICS"><A NAME="17">Constant Register Semantics
</A></A></H3>
<PRE> C0-C255 Constant register [0..255].
The aliases c0-c255 (lowercase) are also accepted.
</PRE><P>
If used with a variable that requires more than one constant register
(e.g. a matrix), the semantic specifies the first register that is used.
</P>
<P>
Example:
</P>
<PRE> uniform float4 array[20] : C14; // uses c14 through c33
</PRE>
<H3><A NAME="TEXTURE_UNIT_SEMANTICS"><A NAME="18">Texture Unit Semantics
</A></A></H3>
<PRE> TEXUNIT0-TEXUNIT31 Texture image unit
</PRE><P>
Example:
</P>
<PRE> uniform sampler2DARRAY texArray : TEXUNIT7;
</PRE>
<H2><A NAME="OUTPUT_SEMANTICS"><A NAME="19">OUTPUT SEMANTICS
</A></A></H2>
<P>
These vertex attribute output semantics match the output semantics for gp4vp.
</P>
<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="20">STANDARD LIBRARY ISSUES
</A></A></H1>
<H2><A NAME="RAW_CAST_FROM_FLOATING-POINT_TO_INTEGER_FUNCTIONS"><A NAME="21">Raw Cast from Floating-point to Integer Functions
</A></A></H2>
<P>
It is possible to convert the raw bit patterns of IEEE single-precision
floating-point to 32-bit unsigned integer.
</P>
<P>
<A HREF="floatToRawIntBits.html">floatToRawIntBits</A>,
<A HREF="floatToIntBits.html">floatToIntBits</A>,
<A HREF="intBitsToFloat.html">intBitsToFloat</A>
</P>
<H2><A NAME="TEXTURE_ARRAY_FUNCTIONS"><A NAME="22">Texture Array Functions
</A></A></H2>
<P>
New sampler data types for texture arrays and texture buffers lead to
new standard library routines to access these samplers.
</P>
<P>
New standard library functions are used to access 1D texture array
samplers (sampler1DARRAY).
</P>
<P>
<A HREF="tex1DARRAY.html">tex1DARRAY</A>,
<A HREF="tex1DARRAYbias.html">tex1DARRAYbias</A>,
<A HREF="tex1DARRAYcmpbias.html">tex1DARRAYcmpbias</A>,
<A HREF="tex1DARRAYlod.html">tex1DARRAYlod</A>,
<A HREF="tex1DARRAYcmplod.html">tex1DARRAYcmplod</A>,
<A HREF="tex1DARRAYproj.html">tex1DARRAYproj</A>
</P>
<P>
The dimensions of a texture array level can be determined.
</P>
<P>
<A HREF="tex1DARRAYsize.html">tex1DARRAYsize</A>
</P>
<P>
New standard library functions are used to access 2D texture array
samplers (sampler2DARRAY).
</P>
<P>
<A HREF="tex2DARRAY.html">tex2DARRAY</A>,
<A HREF="tex2DARRAYbias.html">tex2DARRAYbias</A>,
<A HREF="tex2DARRAYlod.html">tex2DARRAYlod</A>,
<A HREF="tex2DARRAYproj.html">tex2DARRAYproj</A>
</P>
<P>
The dimensions of a texture array level can be determined.
</P>
<P>
<A HREF="tex2DARRAYsize.html">tex2DARRAYsize</A>
</P>
<H1><A NAME="SEE_ALSO"><A NAME="23">SEE ALSO
</A></A></H1>
<P>
<A HREF="gp4.html">gp4</A>,
<A HREF="gp4gp.html">gp4gp</A>,
<A HREF="gp4fp.html">gp4fp</A>,
<A HREF="gp4gp.html">gp4gp</A>,
<A HREF="texBUF.html">texBUF</A>,
<A HREF="texBUFsize.html">texBUFsize</A>,
<A HREF="floatToRawIntBits.html">floatToRawIntBits</A>,
<A HREF="floatToIntBits.html">floatToIntBits</A>,
<A HREF="intBitsToFloat.html">intBitsToFloat</A>,
<A HREF="tex1DARRAY.html">tex1DARRAY</A>,
<A HREF="tex1DARRAYbias.html">tex1DARRAYbias</A>,
<A HREF="tex1DARRAYcmpbias.html">tex1DARRAYcmpbias</A>,
<A HREF="tex1DARRAYlod.html">tex1DARRAYlod</A>,
<A HREF="tex1DARRAYcmplod.html">tex1DARRAYcmplod</A>,
<A HREF="tex1DARRAYproj.html">tex1DARRAYproj</A>,
<A HREF="tex1DARRAYsize.html">tex1DARRAYsize</A>,
<A HREF="tex2DARRAY.html">tex2DARRAY</A>,
<A HREF="tex2DARRAYbias.html">tex2DARRAYbias</A>,
<A HREF="tex2DARRAYlod.html">tex2DARRAYlod</A>,
<A HREF="tex2DARRAYproj.html">tex2DARRAYproj</A>,
<A HREF="tex2DARRAYsize.html">tex2DARRAYsize</A>
</P>
</BLOCKQUOTE>
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