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PROGRAM:

NAME


cgc - cg compiler driver

SYNOPSIS


cgc [options] file ...

DESCRIPTION


cgc is the standalone Cg compiler which translates Cg or GLSL programs into OpenGL or
DirectX shader assembly code, or OpenGL or DirectX shading language code.

OPTIONS


Basic options

-entry name
Sets the entry function for the shader to compile. Defaults to "main".

-o file
Sets the output file to be written. Default outputs to "stdout".

-l file
Sets the listing file, where error and warning messages are written. Defaults to
"stderr".

-profile name
Selects the target profile, specifying the shader language to be generated.

-profileopts opt1,opt2,...
-po opt1,opt2,...
Sets one or more profile specific options.

-noentry
Sets check only mode, where no shader is compiled, but all the code in the input file
is checked for syntactic correctness.

Language options

-oglsl
Sets the source language to GLSL.

-ogles
Sets the source language to OpneGL/ES GLSL.

-strict
-nostrict
Enable or disable strict typechecking, where most questionable constructs will be
flagged as warnings.

-glslWerror
Like "-strict" but in addition, unportable GLSL constructs will be flagged as errors.

-nowarn
Disable all warnings.

-nowarn=N,N,...
Disable one or more specific numbered warnings.

-fx
-nofx
Enables or disables FX parsing mode, where FX keywords are recognized. Defaults to on
in Cg mode and off in GLSL mode.

-nostdlib
Disable the standard library.

Code Generation Options

-fastmath
-nofastmath
Enable or disable optimizations that may chage/lose precision in low order bits, such
as assocative transforms like "(a + b) + c" instead of "a + (b + c)". Default is
"-fastmath".

-fastprecision
-nofastprecision
Enable or disable optimzations doing operations at lower precision than is specified
when the result is later converted to a lower precision or the operands were
originally in lower precision. Default is "-nofastprecision".

-bestprecision
Always do things in the best possible precision; only use lower precision operations
if there is no possibility of difference. Implies "-nofastmath" and
"-nofastprecision".

-unroll all|none|count=N
Control loop unrolling. "-unroll all" will force unrolling of all loops that can be
unrolled, while "-unroll none" will prevent unrolling except if code cannot otherwise
be generated in the current profiles (so it will have no effect in profiles that don't
support looping). "unroll count=N " will unroll loops if the estimate of the
resulting code is less than N instructions. The estimate does not take into account
further optimizations that may be done after unrolling, so it might be quite
inaccurate.

-inline all|none|count=N
Control function inlining. Setting "-inline none" will additionally disable inlining
of functions with an explicit "inline" keyword, which are otherwise always inlined.
Setting "-inline count=0" will effectively disable inlining of all functions that do
not have an explicit "inline" keyword.

-ifcvt all|none|count=N
control if conversion (replacement of small if/else blocks with conditional
assignments).

-ON Sets the optimization level of the compiler, from 0 (lowest) to 3 (highest). Higher
values may produce better code and will cause compile time to increase. Default is
"-O1".

-looplimit N
Assume loops that the compiler cannot determine an upper bound on the number of
iterations may loop as many as N iterations. This may require generating extra code
for such loops in some profiles.

-d3d
Generate code compatible with the Direct3D specification.

-MaxInstInBasicBlock N
break basic blocks after N instructions. This has an effect on local optimizations
that don't cross basic block boundaries and may avoid bad compile time blowups in the
presence of huge basic blocks due to algorithms that are non-linear in the basic block
size.

-maxunrollcount N
Deprecated. Don't unroll loops with more than N iterations. Use the -unroll option
instead, which provides better fine-grained control.

Preprocessor Options

-DMACRO[=VALUE]
Sets a preprocessor macro. If VALUE is not specified it defaults to 1.

-Idirectory
Adds a directory to the end of the search path for "#include" files. The default
search path is empty.

-E Don't compile, just prepocess the input.

-P With "-E", supresses the generation of "#line" directives in the output.

-C With "-E", preserves comments in the output.

-MG Ignore "#include" files that can't be found, rather than issuing an error.

-M
-MM
-MD
-MMD
-MP
-MF file
-MT target
-MQ target
Generate dependency information about "#include"d files. These options are intended
to be compatible with the options to "gcc".

Miscellaneous Options

-quiet
-q Suppress all 'noise' output (copyright notices, indications of which files are being
compiled, etc). With -o and -l, should result in no output being produced.

-nocode
Suppress final code generation. Will actually run all the way through the compiler
(so any errors present should be diagnosed), but don't produce any actual output code.

-v
--version
Print compiler version information to listing.

-h Print short option help summary to stdout and exit.

-help
Print longer option help summary to stdout, including all supported profiles and
profile options, and exit.

-type type_definition
Set an override type binding for a variable.

-typefile file
Read override type bindings for variables from a file.

-dumpinputbind file
Dump type bindings for all variables to a file. This file may be passed back to the
compiler with "-typefile".

Debugging options

-debug
Enable the "debug" builtin function to abort operation of a shader and immedaitely
output a value.

-debuglast
Like "-debug", except the shader does not abort; instead it continues and outputs the
value of the last "debug" function called.

-debugdefault=value
Like "-debug", except if no "debug" call is reached, the output will be set to the
specified value instead of what the shader normally computes.

-deprecated
Issue errors instead of warnings for any deprecated features used.

PROFILES


A profile specifies the output language of the cg compiler (either a shader assembly
dialect, or a shading language). Each profile has its own set of profile options that can
be set for it, though many related profiles have similar or identical options. Profiles
can be grouped by program type, API, or GPU generation.

DirectX profiles
ds_5_0, gs_4_0, gs_5_0, hlslf, hlslv, hs_5_0, ps_1_1, ps_1_2, ps_1_3, ps_2_0, ps_2_x,
ps_3_0, ps_4_0, ps_5_0, vs_1_1, vs_2_0, vs_2_x, vs_3_0, vs_4_0, vs_5_0

OpenGL profiles
arbfp1, arbvp1, fp20, fp30, "fp30unlimited", fp40, "fp40unlimited", glslf, glslg,
glslv, gp4fp, gp4gp, gp4vp, gp5fp, gp5gp, gp5tcp, gp5tep, gp5vp, vp20, vp30, vp40

Fragment profiles
arbfp1, fp20, fp30, "fp30unlimited", fp40, "fp40unlimited", glslf, gp4fp, gp5fp,
hlslf, ps_1_1, ps_1_2, ps_1_3, ps_2_0, ps_2_x, ps_3_0, ps_4_0, ps_5_0

Geometry profiles
glslg, gp4gp, gp5gp, gs_4_0, gs_5_0

Vertex profiles
arbvp1, glslv, gp4vp, gp5vp, hlslv, vp20, vp30, vp40, vs_1_1, vs_2_0, vs_2_x, vs_3_0,
vs_4_0, vs_5_0

GeForce 3/4 Series profiles
fp20, vp20

GeForce 5 Series profiles
fp30, vp30

GeForce 6/7 Series profiles
fp40, vp40

GeForce 8/9/100/200/300 Series, OpenGL 3.x Quadro profiles
gp4fp, gp4gp, gp4vp

GeForce 400 Series, OpenGL 4.x Quadro profiles
gp5fp, gp5gp, gp5tcp, gp5tep, gp5vp

Profile options

Here is a complete list of all profiles and their corresponding profile options

arbfp1
Targets the ARB_fragment_program OpenGL extension

"-po" "ARB_draw_buffers"
Use the ARB_draw_buffers option for multiple renderbuffer targets (MRT). This is
the default

"-po" "ATI_draw_buffers"
Use the ATI_draw_buffers option for multiple renderbuffer targets (MRT).

"-po" "MaxDrawBuffers="N
Set the maximum number of renderbuffer targets. Default is 1

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 32

"-po" "MaxTexIndirections="N
Sets the maximum number of texture indirections allowed in the output program.
Default is 1024

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 1024

"-po" "NumMathInstructionSlots="N
Sets the maximum number of non-texture instructions in the output program.
Default is 1024

"-po" "NumTemps="N
Sets the maximum number of TEMP registers in the output program. Default is 32

"-po" "NumTexInstructionSlots="N
Sets the maximum number of texture instructions in the output program. Default is
1024

arbvp1
Targets the ARB_vertex_program OpenGL extension

"-po" "MaxAddressRegs="N
Sets the maximum number of ADDRESS registers in the output program. Default is 1

"-po" "MaxInstructions="N
Sets the maximum number of instructions in the output program. Default is 1024

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 96

"-po" "NumTemps="N
Sets the maximum number of TEMP registers in the output program. Default is 32

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

fp20
Targets the NV_register_combiners2 and NV_texture_shader OpenGL extensions

fp30
Targets the NV_fragment_program OpenGL extension

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 256

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 32

"fp30unlimited"
Same as fp30 with various hardware limits on registers and instructions lifted

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 4194304

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 512

fp40
Targets the NV_fragment_program2 OpenGL extension

"-po" "appleKilWAR"
Work around various bugs with KIL instructions in the OSX-tiger implementation of
NV_fragment_program2

"-po" "ARB_draw_buffers"
Use the ARB_draw_buffers option for multiple renderbuffer targets (MRT). This is
the default

"-po" "ATI_draw_buffers"
Use the ATI_draw_buffers option for multiple renderbuffer targets (MRT).

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is infinite

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is
infinite

"-po" "NumTemps="N
Sets the maximum number of TEMP registers in the output program. Default is
infinite

"-po" "OutColorPrec="N
If N is 3 or 4, force output to fp16 precision. If N is 2, force output to fp32
precision.

"fp40unlimited"
Same as fp40 with various hardware limits on registers and instructions lifted

"-po" "appleKilWAR"
Work around various bugs with KIL instructions in the OSX-tiger implementation of
NV_fragment_program2

"-po" "ARB_draw_buffers"
Use the ARB_draw_buffers option for multiple renderbuffer targets (MRT). This is
the default

"-po" "ATI_draw_buffers"
Use the ATI_draw_buffers option for multiple renderbuffer targets (MRT).

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 1024

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 4194304

"-po" "NumTemps="N
Sets the maximum number of TEMP registers in the output program. Default is 512

"-po" "OutColorPrec="N
If N is 3 or 4, force output to fp16 precision. If N is 2, force output to fp32
precision.

"generic"
Produces a dump of the program in a non-executable format

glslf, glslg and glslv
Targets the OpenGL Shading language (GLSL) v1.10. glslf targets fragment programs
while glslv targets vertex programs

version=val
GLSL version to target. Supported versions are 100, 110, 120, 130, 140 and 150.

userTexCoord
Use user-defined varying instead of gl_TexCoord.

ATI_draw_buffers
Use ATI_draw_buffers extension for MRT.

EXT_gpu_shader4
Use EXT_gpu_shader4 extension where useful.

gp4fp
Targets the NV_gpu_program4 and NV_fragment_program4 OpenGL extensions.

"-po" "fastimul"
Assume integer multiply inputs have at most 24 significant bits.

"-po" "NV_shader_buffer_load"
Use the NV_shader_buffer_load OpenGL extension.

"-po" "NV_parameter_buffer_object2"
Use the NV_parameter_buffer_object2 OpenGL extension.

"-po" "PaBO2"
Use the NV_parameter_buffer_object2 OpenGL extension.

"-po" "ARB_draw_buffers"
Use the ARB_draw_buffers option for multiple renderbuffer targets (MRT). This is
the default

"-po" "ATI_draw_buffers"
Use the ATI_draw_buffers option for multiple renderbuffer targets (MRT).

"-po" "pixel_center_integer"
Use integer pixel centers.

"-po" "origin_upper_left"
Use upper left pixel origin.

gp4gp
Targets the NV_gpu_program4 and NV_geometry_program4 OpenGL extensions.

"-po" "POINT"
"-po" "LINE"
"-po" "LINE_ADJ"
"-po" "TRIANGLE"
"-po" "TRIANGLE_ADJ"
Set the input primitive type for the geometry program

"-po" "POINT_OUT"
"-po" "LINE_OUT"
"-po" "TRIANGLE_OUT"
Set the output primitive type for the geometry program

"-po" "Vertices="N
Set the number of vertices output by the geometry program

gp4vp
Targets the NV_gpu_program4 and NV_vertex_program4 OpenGL extensions.

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

gp5fp
Targets the NV_gpu_program5 OpenGL extension.

"-po" "fastimul"
Assume integer multiply inputs have at most 24 significant bits.

"-po" "NV_shader_buffer_load"
Use the NV_shader_buffer_load OpenGL extension.

"-po" "NV_parameter_buffer_object2"
Use the NV_parameter_buffer_object2 OpenGL extension.

"-po" "PaBO2"
Use the NV_parameter_buffer_object2 OpenGL extension.

"-po" "ARB_draw_buffers"
Use the ARB_draw_buffers option for multiple renderbuffer targets (MRT). This is
the default

"-po" "ATI_draw_buffers"
Use the ATI_draw_buffers option for multiple renderbuffer targets (MRT).

"-po" "pixel_center_integer"
Use the ARB_fragment_coord_conventions OpenGL extension to specify integer pixel
centers.

"-po" "origin_upper_left"
Use the ARB_fragment_coord_conventions OpenGL extension to specify upper left
pixel origin.

"-po" "NV_early_fragment_tests"
Perform depth and stencil tests prior to fragment program invocation.

gp5gp
Targets the NV_gpu_program5 OpenGL extension.

"-po" "POINT"
"-po" "LINE"
"-po" "LINE_ADJ"
"-po" "TRIANGLE"
"-po" "TRIANGLE_ADJ"
Set the input primitive type for the geometry program

"-po" "POINT_OUT"
"-po" "LINE_OUT"
"-po" "TRIANGLE_OUT"
Set the output primitive type for the geometry program

"-po" "Vertices="N
Set the number of vertices output by the geometry program

gp5tcp
Targets the NV_tessellation_program and NV_gpu_program5 OpenGL extensions.

gp5tep
Targets the NV_tessellation_program and NV_gpu_program5 OpenGL extensions.

gp5vp
Targets the NV_gpu_program5 OpenGL extension.

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

hlslf hlslv
Targets Microsoft High-Level Shading Language (HLSL). hlslf targets pixel programs
while hlslv targets vertex programs

ps_1_1 ps_1_2 ps_1_3
Targets DirectX pixel programs

"-po" "MaxPixelShaderValue="N
Maximum absolute value representable in a pixel shader. Default is 1.

ps_2_0 ps_2_x
Targets DirectX pixel programs

"-po" "MaxDrawBuffers="N
Set the maximum number of renderbuffer targets. Default is 1

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 96 or
512

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 12 or 32

ps_3_0
Targets DirectX pixel programs

"-po" "MaxDrawBuffers="N
Set the maximum number of renderbuffer targets. Default is 1

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 224

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 32768

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 32

"-po" "OutColorPrec="N
If N is 3 or 4, force output to fp16 precision. If N is 2, force output to fp32
precision.

vp20
Targets the NV_vertex_program OpenGL extension

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 96

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

vp30
Targets the NV_vertex_program2 OpenGL extension

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 256

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

vp40
Targets the NV_vertex_program3 OpenGL extension

"-po" "MaxAddressRegs="N
Sets the maximum number of ADDRESS registers in the output program. Default is 2

"-po" "MaxInstructions="N
Sets the maximum number of instructions in the output program. Default is 2048

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 544

"-po" "NumTemps="N
Sets the maximum number of TEMP registers in the output program. Default is 32

"-po" "PosInv"
Generate position invariant code (same as fixed-function) for POSITION output

vs_1_1
Targets DirectX vertex programs

"-po" "dcls"
Output dx9-style dcls statements

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 96

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 128

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 12

vs_2_0 vs_2_x
Targets DirectX vertex programs

"-po" "dcls"
Output dx9-style dcls statements

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 256

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 256

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 12

vs_3_0
Targets DirectX vertex programs

"-po" "dcls"
Output dx9-style dcls statements

"-po" "MaxLocalParams="N
Set the maximum number of uniform parameter slots available. Default is 256

"-po" "NumInstructionSlots="N
Sets the maximum number of instructions in the output program. Default is 32768

"-po" "NumTemps="N
Sets the maximum number of temporaries in the output program. Default is 32

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