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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>gp4fp</B> - OpenGL fragment 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> gp4fp
</PRE>
<H1><A NAME="DESCRIPTION"><A NAME="3">DESCRIPTION
</A></A></H1>
<P>
This OpenGL profile corresponds to the per-fragment 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_fragment_program</B>.
</P>
<P>
Note that the <B>NV_gpu_program4</B> extension has its fragment domain-specific
aspects documented in the <B>NV_fragment_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>
Parameter buffer objects (also known as "constant buffers" in DirectX
10 or "bindable uniform" in GLSL's <B>EXT_bindable_uniform</B> extension)
provide a way to source uniform values from OpenGL buffer objects.
</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 6800 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/fragment_program4.txt">www.opengl.org/registry/specs/NV/fragment_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><P>
Draw buffers:
</P>
<PRE> <A HREF="http://www.opengl.org/registry/specs/ARB/draw_buffers.txt">www.opengl.org/registry/specs/ARB/draw_buffers.txt</A>
<A HREF="http://www.opengl.org/registry/specs/ATI/draw_buffers.txt">www.opengl.org/registry/specs/ATI/draw_buffers.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>
<H2><A NAME="FRAGMENT_DOMAIN-SPECIFIC_GP4_OPTIONS"><A NAME="8">Fragment Domain-specific GP4 Options
</A></A></H2>
<DL>
<DT><STRONG>ARB_draw_buffers=<I>val</I>
</STRONG></DT>
<DD>
<DT><STRONG>ATI_draw_buffers=<I>val</I>
</STRONG></DT>
<DD>
<P>
Indicates that the <B>ARB_draw_buffers</B> or <B>ATI_draw_buffers</B> OpenGL extension
is supported and what the extension's implementation dependent value of
GL_MAX_DRAW_BUFFERS_ARB or GL_MAX_DRAW_BUFFERS_ATI is.
</P>
<P>
When specified, the compiler generates the "OPTION ARB_draw_buffers;"
or "OPTION ATI_draw_buffers;" in the compiled code to enable output
to multiple draw buffers. Output to multiple draw buffers is done by
specifying output parameters with the COLOR1, COLOR2, etc. semantics.
</P>
<P>
GPUs that support these extensions typically support up to 4 buffers.
</P>
<P>
These options are useful in the rare situation you want to control the
specific OPTION name used. For example, Apple drivers support the
<B>ARB_draw_buffers</B> extension but not the <B>ATI_draw_buffers</B> extension.
</P>
<P>
The CgGL runtime routine <A HREF="cgGLSetOptimalOptions.html">cgGLSetOptimalOptions</A>
will automatically add
the appropriate option based on querying the current OpenGL context's
extension support (prefering the ARB extension) and specify the proper
limit.
</P>
</DD></DL>
<H1><A NAME="DATA_TYPES"><A NAME="9">DATA TYPES
</A></A></H1>
<H2><A NAME="SAMPLERS"><A NAME="10">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="11">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="12">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="13">SEMANTICS
</A></A></H1>
<H2><A NAME="VARYING_INPUT_SEMANTICS"><A NAME="14">VARYING INPUT SEMANTICS
</A></A></H2>
<H3><A NAME="INTERPOLATED_INPUT_SEMANTICS"><A NAME="15">Interpolated Input Semantics
</A></A></H3>
<P>
The varying input semantics in the <B>gp4fp</B> profile correspond to the
respectively named varying output semantics of the <B>gp4vp</B> profile (or <B>gp4gp</B> if a geometry shader
is present).
</P>
<PRE> Binding Semantics Name Corresponding Data
COLOR Input primary color
COLOR0
COL
COL0
COLOR1 Input secondary color
COL1
WPOS Window position (with lower-left origin)
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>
<H3><A NAME="INTERPOLATION_SEMANTIC_MODIFIERS"><A NAME="16">Interpolation Semantic Modifiers
</A></A></H3>
<P>
A number of interpolation semantic modifiers control how interpolation happens
for the interpolated input semantics above. These modifiers are suffixed to
the semantic name with a "." (period) seperator. Without a modifier, perspective-correct
interpolation applies.
</P>
<PRE> Semantic Modifier Name Meaning
CENTROID Interpolate at the centroid of the covered samples
(only applies when rendering to multisampled surface)
FLAT Flat shading using provoking vertex's value
NOPERSPECTIVE Interpolate without perspective correction
</PRE><P>
Examples:
</P>
<PRE> float4 a : TEXCOORD0
float4 b : TEXCOORD1.CENTROID
float4 c : TEXCOORD2.FLAT
float4 d : TEXCOORD3.NOPERSPECTIVE
</PRE>
<H3><A NAME="PER-PRIMITIVE_INPUT_SEMANTICS"><A NAME="17">Per-primitive Input Semantics
</A></A></H3>
<PRE> FACE Polygon facing.
+1 for front-facing polygon or line or point
-1 for back-facing polygon
PRIMITIVEID Primitive ID (int)
</PRE><P>
If a geometry program is active, parameters given the PRIMITIVEID
semantic obtained their integer value from the primitive ID value
emitted by the geometry program for the provoking vertex. If no geometry
program is active, the value is the number of primitives processed by the
rasterizer since the last time glBegin was called (directly or indirectly
via vertex array functions). The first primitive generated after a
glBegin is numbered zero, and the primitive ID counter is incremented
after every individual point, line, or polygon primitive is processed.
For polygons drawn in point or line mode, the primitive ID counter is
incremented only once, even though multiple points or lines may be drawn.
For QUADS and QUAD_STRIP primitives that are decomposed into triangles,
the primitive ID is incremented after each complete quad is processed.
For POLYGON primitives, the primitive ID counter is zero. The primitive
ID is zero for fragments generated by DrawPixels or Bitmap. Restarting a
primitive topology using the primitive restart index has no effect on
the primitive ID counter.
</P>
<H2><A NAME="UNIFORM_INPUT_SEMANTICS"><A NAME="18">UNIFORM INPUT SEMANTICS
</A></A></H2>
<H3><A NAME="BUFFER_SEMANTICS"><A NAME="19">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="20">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="21">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="22">OUTPUT SEMANTICS
</A></A></H2>
<PRE> COLOR Output color (float4 or int4)
COL
COLOR0-COLOR7 Output color (float4 or int4) for draw buffers 0 to 7
COL0-COL7
DEPTH Output depth (float)
DEPR
</PRE>
<H1><A NAME="STANDARD_LIBRARY_ISSUES"><A NAME="23">STANDARD LIBRARY ISSUES
</A></A></H1>
<H2><A NAME="RAW_CAST_FROM_FLOATING-POINT_TO_INTEGER_FUNCTIONS"><A NAME="24">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="25">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="26">SEE ALSO
</A></A></H1>
<P>
<A HREF="gp4.html">gp4</A>,
<A HREF="gp4vp.html">gp4vp</A>,
<A HREF="gp4gp.html">gp4gp</A>,
<A HREF="gp4vp.html">gp4vp</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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