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GL_NV_texture_shader2
NV_texture_shader2
Name Strings
GL_NV_texture_shader2
Contact
Mark J. Kilgard, NVIDIA Corporation (mjk 'at' nvidia.com)
Notice
Copyright NVIDIA Corporation, 1999, 2000, 2001.
IP Status
NVIDIA Proprietary.
Version
NVIDIA Date: April 29, 2004
$Date: 2004/04/29 $ $Revision: #9 $
$Id: //sw/main/docs/OpenGL/specs/GL_NV_texture_shader2.txt#9 $
Number
231
Dependencies
Written based on the wording of the OpenGL 1.2.1 specification,
augmented by the NV_texture_shader extension specification.
Requires support for the NV_texture_shader extension.
Overview
This extension extends the NV_texture_shader functionality to
support texture shader operations for 3D textures.
See the NV_texture_shader extension for information about the
texture shader operational model.
The two new texture shader operations are:
<conventional textures>
22. TEXTURE_3D - Accesses a 3D texture via (s/q,t/q,r/q).
<dot product textures>
23. DOT_PRODUCT_TEXTURE_3D_NV - When preceded by two DOT_PRODUCT_NV
programs in the previous two texture shader stages, computes a
third similar dot product and composes the three dot products
into (s,t,r) texture coordinate set to access a 3D non-projective
texture.
Issues
Why a separate extension?
Not all implementations of NV_texture_shader will support 3D
textures in hardware.
Breaking this extension out into a distinct extension allows OpenGL
programs that only would use 3D textures if they are supported
in hardware to determine whether hardware support is available by
explicitly looking for the NV_texture_shader2 extension.
What if an implementation wanted to support NV_texture_shader2
operations within a software rasterizer?
Implementations should be free to implement the 3D texture texture
shader operations in software. In this case, the implementation
should NOT advertise the NV_texture_shader2 extension, but should
still accept the GL_TEXTURE_3D and GL_DOT_PRODUCT_TEXTURE_3D_NV
texture shader operations without an error. Likewise, the
glTexImage3D command should accept the new internal texture formats,
formats, and types allowed by this extension should be accepted
without an error.
When NV_texture_shader2 is not advertised in the GL_EXTENSIONS
string, but the extension functionality works without GL errors,
programs should expect that these two texture shader operations
are slow.
None.
When the <target> and <pname> parameters of TexEnvf, TexEnvfv,
TexEnvi, and TexEnviv are TEXTURE_SHADER_NV and SHADER_OPERATION_NV
respectively, then the value of <param> or the value pointed to by
<params> may be:
TEXTURE_3D
DOT_PRODUCT_TEXTURE_3D_NV 0x86EF
Accepted by the <format> parameter of TexImage3D and TexSubImage3D:
HILO_NV 0x86F4
DSDT_NV 0x86F5
DSDT_MAG_NV 0x86F6
DSDT_MAG_VIB_NV 0x86F7
Accepted by the <type> parameter of TexImage3D and TexSubImage3D:
UNSIGNED_INT_S8_S8_8_8_NV 0x86DA
UNSIGNED_INT_8_8_S8_S8_REV_NV 0x86DB
Accepted by the <internalformat> parameter of TexImage3D:
SIGNED_RGBA_NV 0x86FB
SIGNED_RGBA8_NV 0x86FC
SIGNED_RGB_NV 0x86FE
SIGNED_RGB8_NV 0x86FF
SIGNED_LUMINANCE_NV 0x8701
SIGNED_LUMINANCE8_NV 0x8702
SIGNED_LUMINANCE_ALPHA_NV 0x8703
SIGNED_LUMINANCE8_ALPHA8_NV 0x8704
SIGNED_ALPHA_NV 0x8705
SIGNED_ALPHA8_NV 0x8706
SIGNED_INTENSITY_NV 0x8707
SIGNED_INTENSITY8_NV 0x8708
SIGNED_RGB_UNSIGNED_ALPHA_NV 0x870C
SIGNED_RGB8_UNSIGNED_ALPHA8_NV 0x870D
Accepted by the <internalformat> parameter of TexImage3D:
HILO_NV
HILO16_NV 0x86F8
SIGNED_HILO_NV 0x86F9
SIGNED_HILO16_NV 0x86FA
DSDT_NV
DSDT8_NV 0x8709
DSDT_MAG_NV
DSDT8_MAG8_NV 0x870A
DSDT_MAG_INTENSITY_NV 0x86DC
DSDT8_MAG8_INTENSITY8_NV 0x870B
Additions to Chapter 2 of the 1.2 Specification (OpenGL Operation)
None
Additions to Chapter 3 of the 1.2 Specification (Rasterization)
-- Section 3.8 "Texturing"
Replace the third paragraph (amended by the NV_texture_shader
extension) with the following that includes 3D texture references:
"The alternative to conventional texturing is the texture shaders
mechanism. When texture shaders are enabled, each texture unit
uses one of twenty-three texture shader operations. Twenty of the
twenty-three shader operations map an (s,t,r,q) texture coordinate
set to an RGBA color. Of these, four texture shader operations
directly correspond to the 1D, 2D, 3D, and cube map conventional
texturing operations. Depending on the texture shader operation,
the mapping from the (s,t,r,q) texture coordinate set to an RGBA
color may depend on the given texture unit's currently bound
texture object state and/or the results of previous texture
shader operations. The three remaining texture shader operations
respectively provide a fragment culling mechanism based on texture
coordinates, a means to replace the fragment depth value, and a dot
product operation that computes a floating-point value for use by
subsequent texture shaders. The specifics of each texture shader
operation are described in section 3.8.12."
-- Section 3.8.2 "Alternate Texture Image Specification Commands"
Amend the following text inserted by NV_texture_shader after the
six paragraph to include 3D texture references:
"CopyTexSubImage3D, CopyTexSubImage2D, and CopyTexSubImage1D generate
the error INVALID_OPERATION if the internal format of the texture
array to which the pixels are to be copied is one of HILO_NV,
HILO16_NV, SIGNED_HILO_NV, SIGNED_HILO16_NV, DSDT_NV, DSDT8_NV,
DSDT_MAG_NV, DSDT8_MAG8_NV, DSDT_MAG_INTENSITY_NV, or
DSDT8_MAG8_INTENSITY8_NV.
TexSubImage3D, TexSubImage2D, and TexSubImage1D generate the error
INVALID_OPERATION if the internal format of the texture array
to which the texels are to be copied has a different format type
(according to table 3.15) than the format type of the texels being
specified. Specifically, if the base internal format is not one of
HILO_NV, DSDT_NV, DSDT_MAG_NV, or DSDT_INTENSITY_NV, then the format
parameter must be one of COLOR_INDEX, RED, GREEN, BLUE, ALPHA,
RGB, RGBA, LUMINANCE, or LUMINANCE_ALPHA; if the base internal
format is HILO_NV, then the format parameter must be HILO_NV;
if the base internal format is DSDT_NV, then the format parameter
must be DSDT_NV; if the base internal format is DSDT_MAG_NV, then
the format parameter must be DSDT_MAG_NV; if the base internal
format is DSDT_MAG_INTENSITY_NV, the format parameter must be
DSDT_MAG_VIB_NV."
-- Section 3.8.13 "Texture Shaders"
Amend the designated paragraphs of the NV_texture_shader
specification to include discussion of 3D textures.
1st paragraph:
"Each texture unit is configured with one of twenty-three
texture shader operations. Several texture shader operations
require additional state. All per-texture shader stage state
is specified using the TexEnv commands with the target specified
as TEXTURE_SHADER_NV. The per-texture shader state is replicated
per texture unit so the texture unit selected by ActiveTextureARB
determines which texture unit's environment is modified by TexEnv
calls."
3rd paragraph:
"When TexEnv is called with the target of TEXTURE_SHADER_NV,
SHADER_OPERATION_NV may be set to one of NONE, TEXTURE_1D,
TEXTURE_2D, TEXTURE_3D, TEXTURE_CUBE_MAP_ARB, PASS_THROUGH_NV,
CULL_FRAGMENT_NV, OFFSET_TEXTURE_2D_NV, OFFSET_TEXTURE_2D_SCALE_NV,
OFFSET_TEXTURE_RECTANGLE_NV, OFFSET_TEXTURE_RECTANGLE_SCALE_NV,
DEPENDENT_AR_TEXTURE_2D_NV, DEPENDENT_GB_TEXTURE_2D_NV,
DOT_PRODUCT_NV, DOT_PRODUCT_DEPTH_REPLACE_NV,
DOT_PRODUCT_TEXTURE_2D_NV, DOT_PRODUCT_TEXTURE_RECTANGLE_NV,
DOT_PRODUCT_TEXTURE_3D_NV, DOT_PRODUCT_TEXTURE_CUBE_MAP_NV,
DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV, or
DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV. The semantics of each of
these shader operations is described in section 3.8.13.1. Not every
operation is supported in every texture unit. The restrictions for
how these shader operations can be configured in various texture
units are described in section 3.8.13.2."
3.8.13.1 Texture Shader Operations
Amend tables 3.A, 3.B, 3.C, and 3.D in the NV_texture_shader
specification to include entries for 3D texture operations:
Table 3.A:
texture shader
texture shader operation i previous texture input texture shader operation i-1 operation i-2 texture shader operation i+1
================================= ========================= =============================== ================ ================================
TEXTURE_3D - - - -
--------------------------------- ------------------------- ------------------------------- ---------------- --------------------------------
DOT_PRODUCT_TEXTURE_3D_NV shader result type must shader operation shader operation -
be one of signed HILO, must be must be
unsigned HILO, all DOT_PRODUCT_NV DOT_PRODUCT_NV
signed RGBA, all
unsigned RGBA
--------------------------------- ------------------------- ------------------------------- ---------------- --------------------------------
Table 3.B:
texture shader operation i texture unit i
================================= =======================================
TEXTURE_3D 3D target must be consistent
--------------------------------- ---------------------------------------
DOT_PRODUCT_TEXTURE_3D_NV 3D target must be consistent
--------------------------------- ---------------------------------------
Table 3.C:
uses uses uses uses uses offset uses
texture stage stage stage previous uses offset texture const
coordinate texture result result result texture cull texture 2D scale eye
texture shader operation i set usage target i-1 i-2 i+1 input modes 2D matrix and bias vector
================================= ========== ========= ====== ====== ====== ======== ===== ========= ======== ======
TEXTURE_3D s,t,r,q 3D - - - - - - - -
--------------------------------- ---------- --------- ------ ------ ------ -------- ----- --------- -------- ------
DOT_PRODUCT_TEXTURE_3D_NV s,t,r 3D y y - y - - - -
--------------------------------- ---------- --------- ------ ------ ------ -------- ----- --------- -------- ------
Table 3.D:
texture shader operation i shader stage result type shader stage result texture unit RGBA color result
================================= ============================= =================================== ======================================
TEXTURE_3D matches 3D target type filtered 3D target texel if 3D target texture type is RGBA,
filtered 3D target texel,
else (0,0,0,0)
--------------------------------- ----------------------------- ----------------------------------- --------------------------------------
DOT_PRODUCT_TEXTURE_3D_NV matches 3D target type filtered 3D target texel if 3D target texture type is RGBA,
filtered 3D target texel,
else (0,0,0,0)
------------------------------- ----------------------------- ----------------------------------- --------------------------------------
Add the following new sections specifying new 3D texture operations:
3.8.13.1.22 3D Projective Texturing
The TEXTURE_3D texture shader operation accesses the texture unit's
3D texture object (as described in sections 3.8.4, 3.8.5, and 3.8.6)
using (s/q,t/q,r/q) for the 3D texture coordinates where s, t, r,
and q are the homogeneous texture coordinates for the texture unit.
The result of the texture access becomes both the shader result and
texture unit RGBA result (see table 3.E). The type of the shader
result depends on the format type of the accessed texture. This mode
is equivalent to conventional texturing's 3D texture target.
If the texture unit's 3D texture object is not consistent, then
this texture shader stage is not consistent.
If this texture shader stage is not consistent, it operates as if
it is the NONE operation.
3.8.13.1.23 Dot Product Texture 3D
The DOT_PRODUCT_TEXTURE_3D_NV texture shader operation accesses the
texture unit's 3D texture object (as described in sections 3.8.4,
3.8.5, and 3.8.6) using (dotPP,dotP,dotC) for the 3D texture
coordinates. The result of the texture access becomes both
the shader result and texture unit RGBA result (see table 3.E).
The type of the shader result depends on the format type of the
accessed texture.
Assuming that i is the current texture shader stage, dotPP is the
floating-point dot product texture shader result from the i-2
texture shader stage, assuming the i-2 texture shader stage's
operation is DOT_PRODUCT_NV. dotP is the floating-point dot
product texture shader result from the i-1 texture shader stage,
assuming the i-1 texture shader stage's operation is DOT_PRODUCT_NV.
dotC is the floating-point dot product result from the current
texture shader stage. dotC is computed in the identical manner
used to compute the floating-point result of the DOT_PRODUCT_NV
texture shader described in section 3.8.13.1.14.
If the previous texture input texture object specified by the
current texture shader stage's PREVIOUS_TEXTURE_INPUT_NV value has
a format type other than RGBA or HILO (the DSDT_MAG_INTENSITY_NV
base internal format does not count as an RGBA format type in this
context), then this texture shader stage is not consistent.
If the previous texture input texture shader operation specified by
the current texture shader stage's PREVIOUS_TEXTURE_INPUT_NV value
is DOT_PRODUCT_NV, then this texture shader stage is not consistent.
If the previous texture input texture shader result specified by
the current texture shader stage's PREVIOUS_TEXTURE_INPUT_NV value
is invalid, then this texture shader stage is not consistent.
If the previous texture input shader stage specified by the current
texture shader stage's PREVIOUS_TEXTURE_INPUT_NV value is not
consistent, then this texture shader stage is not consistent.
If either the i-1 or i-2 texture shader stage operation is not
DOT_PRODUCT_NV, then this texture shader stage is not consistent.
If either the i-1 or i-2 texture shader stage is not consistent, then
this texture shader stage is not consistent.
If the texture unit's 3D texture object is not consistent, then
this texture shader stage is not consistent.
If this texture shader stage is not consistent, it operates as if
it is the NONE operation.
3.8.13.2 Texture Shader Restrictions
Amend the first four paragraphs in this section to include 3D
texture operations:
"There are various restrictions on possible texture shader
configurations. These restrictions are described in this section.
The error INVALID_OPERATION occurs if the SHADER_OPERATION_NV
parameter for texture unit 0 is assigned one of
OFFSET_TEXTURE_2D_NV, OFFSET_TEXTURE_2D_SCALE_NV,
OFFSET_TEXTURE_RECTANGLE_NV, OFFSET_TEXTURE_RECTANGLE_SCALE_NV,
DEPENDENT_AR_TEXTURE_2D_NV, DEPENDENT_GB_TEXTURE_2D_NV,
DOT_PRODUCT_NV, DOT_PRODUCT_DEPTH_REPLACE_NV,
DOT_PRODUCT_TEXTURE_2D_NV, DOT_PRODUCT_TEXTURE_RECTANGLE_NV,
DOT_PRODUCT_TEXTURE_3D_NV, DOT_PRODUCT_TEXTURE_CUBE_MAP_NV,
DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV,
or DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV. Each of these
texture shaders requires a previous texture shader result that
is not possible for texture unit 0. Therefore these shaders are
disallowed for texture unit 0.
The error INVALID_OPERATION occurs if the
SHADER_OPERATION_NV parameter for texture unit
1 is assigned one of DOT_PRODUCT_DEPTH_REPLACE_NV,
DOT_PRODUCT_TEXTURE_2D_NV, DOT_PRODUCT_TEXTURE_RECTANGLE_NV,
DOT_PRODUCT_TEXTURE_3D_NV, DOT_PRODUCT_TEXTURE_CUBE_MAP_NV,
DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV,
or DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV. Each of these texture
shaders requires either two previous texture shader results or
a dot product result that cannot be generated by texture unit 0.
Therefore these shaders are disallowed for texture unit 1.
The error INVALID_OPERATION occurs if the
SHADER_OPERATION_NV parameter for texture unit
2 is assigned one of DOT_PRODUCT_TEXTURE_3D_NV,
DOT_PRODUCT_TEXTURE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV,
DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV. Each of these texture
shaders requires three previous texture shader results. Therefore
these shaders are disallowed for texture unit 2."
3.8.13.3 Required State
Amend the first paragraph in this section to account for the 2 new
3D texture shader operations:
"The state required for texture shaders consists of a single bit to
indicate whether or not texture shaders are enabled, a vector of
three floating-point values for the constant eye vector, and n sets
of per-texture unit state where n is the implementation-dependent
number of supported texture units. The set of per-texture unit
texture shader state consists of the twenty-three-valued integer
indicating the texture shader operation, four two-valued integers
indicating the cull modes, an integer indicating the previous texture
unit input, a two-valued integer indicating the RGBA unsigned dot
product mapping mode, a 2x2 floating-point matrix indicating the
texture offset transform, a floating-point value indicating the
texture offset scale, a floating-point value indicating the texture
offset bias, and a bit to indicate whether or not the texture shader
stage is consistent."
Additions to Chapter 4 of the 1.2 Specification (Per-Fragment Operations
and the Frame Buffer)
None
Additions to Chapter 5 of the 1.2 Specification (Special Functions)
None
Additions to Chapter 6 of the 1.2 Specification (State and State Requests)
None
Additions to the GLX Specification
None
Dependencies on other specifications
Same as the NV_texture_shader extension.
Errors
The following errors are updated to reflect 3D texture operations:
INVALID_OPERATION is generated if a packed pixel format type listed
in table 3.8 is used with DrawPixels, ReadPixels, ColorTable,
ColorSubTable, ConvolutionFilter1D, ConvolutionFilter2D,
SeparableFilter2D, GetColorTable, GetConvolutionFilter,
GetSeparableFilter, GetHistogram, GetMinmax, TexImage1D, TexImage2D,
TexImage3D, TexSubImage1D, TexSubImage2D, TexSubImage3d, or
GetTexImage but the format parameter does not match on of the allowed
Matching Pixel Formats listed in table 3.8 for the specified packed
type parameter.
INVALID_OPERATION is generated when TexImage1D, TexImage2D,
or TexImage3D are called and the format is HILO_NV and the
internalformat is not one of HILO_NV, HILO16_NV, SIGNED_HILO_NV,
SIGNED_HILO16_NV; or if the internalformat is one of HILO_NV,
HILO16_NV, SIGNED_HILO_NV, or SIGNED_HILO16_NV and the format is
not HILO_NV.
INVALID_OPERATION is generated when TexImage3D, TexImage2D,
or TexImage1D is called and if the format is DSDT_NV and the
internalformat is not either DSDT_NV or DSDT8_NV; or if the internal
format is either DSDT_NV or DSDT8_NV and the format is not DSDT_NV.
INVALID_OPERATION is generated when TexImage3D, TexImage2D, or
TexImage1D is called and if the format is DSDT_MAG_NV and the
internalformat is not either DSDT_MAG_NV or DSDT8_MAG8_NV; or if
the internal format is either DSDT_MAG_NV or DSDT8_MAG8_NV and the
format is not DSDT_MAG_NV.
INVALID_OPERATION is generated when TexImage3D, TexImage2D,
or TexImage1D is called and if the format is DSDT_MAG_VIB_NV
and the internalformat is not either DSDT_MAG_INTENSITY_NV or
DSDT8_MAG8_INTENSITY8_NV; or if the internal format is either
DSDT_MAG_INTENSITY_NV or DSDT8_MAG8_INTENSITY8_NV and the format
is not DSDT_MAG_VIB_NV.
INVALID_OPERATION is generated when CopyTexImage2D, CopyTexImage1D,
CopyTexSubImage3D, CopyTexSubImage2D, or CopyTexSubImage1D is called
and the internal format of the texture array to which the pixels
are to be copied is one of HILO_NV, HILO16_NV, SIGNED_HILO_NV,
SIGNED_HILO16_NV, DSDT_NV, DSDT8_NV, DSDT_MAG_NV, DSDT8_MAG8_NV,
DSDT_MAG_INTENSITY_NV, or DSDT8_MAG8_INTENSITY8_NV.
INVALID_OPERATION is generated when TexSubImage3D, TexSubImage2D, or
TexSubImage1D is called and the texture array's base internal format
is not one of HILO_NV, DSDT_NV, DSDT_MAG_NV, or DSDT_INTENSITY_NV,
and the format parameter is not one of COLOR_INDEX, RED,
GREEN, BLUE, ALPHA, RGB, RGBA, LUMINANCE, or
LUMINANCE_ALPHA
INVALID_OPERATION is generated when TexSubImage3D, TexSubImage2D, or
TexSubImage1D is called and the texture array's base internal format
is HILO_NV and the format parameter is not HILO_NV.
INVALID_OPERATION is generated when TexSubImage3D, TexSubImage2D, or
TexSubImage1D is called and the texture array's base internal format
is DSDT_NV and the format parameter is not DSDT_NV.
INVALID_OPERATION is generated when TexSubImage3D, TexSubImage2D, or
TexSubImage1D is called and the texture array's base internal format
is DSDT_MAG_NV and the format parameter is not DSDT_MAG_NV.
INVALID_OPERATION is generated when TexSubImage3D, TexSubImage2D,
or TexSubImage1D is called and the texture array's base internal
format is DSDT_MAG_INTENSITY_NV and the format parameter is not
DSDT_MAG_VIRBANCE_NV.
INVALID_OPERATION is generated when TexEnv is called and the
SHADER_OPERATION_NV parameter for texture unit 0 is assigned
one of OFFSET_TEXTURE_2D_NV, OFFSET_TEXTURE_2D_SCALE_NV,
OFFSET_TEXTURE_RECTANGLE_NV, OFFSET_TEXTURE_RECTANGLE_SCALE_NV,
DEPENDENT_AR_TEXTURE_2D_NV, DEPENDENT_GB_TEXTURE_2D_NV,
DOT_PRODUCT_NV, DOT_PRODUCT_DEPTH_REPLACE_NV,
DOT_PRODUCT_TEXTURE_2D_NV, DOT_PRODUCT_TEXTURE_RECTANGLE_NV,
DOT_PRODUCT_TEXTURE_3D_NV, DOT_PRODUCT_TEXTURE_CUBE_MAP_NV,
DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV.
or DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV.
INVALID_OPERATION is generated when TexEnv is called
and the SHADER_OPERATION_NV parameter for texture
unit 1 is assigned one of DOT_PRODUCT_DEPTH_REPLACE_NV,
DOT_PRODUCT_TEXTURE_2D_NV, DOT_PRODUCT_TEXTURE_RECTANGLE_NV,
DOT_PRODUCT_TEXTURE_3D_NV, DOT_PRODUCT_TEXTURE_CUBE_MAP_NV,
DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV,
or DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV.
INVALID_OPERATION is generated when TexEnv is called
and the SHADER_OPERATION_NV parameter for texture
unit 2 is assigned one of DOT_PRODUCT_TEXTURE_3D_NV,
DOT_PRODUCT_TEXTURE_CUBE_MAP_NV, DOT_PRODUCT_REFLECT_CUBE_MAP_NV,
or DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV.
INVALID_OPERATION is generated when TexEnv is called and the
SHADER_OPERATION_NV parameter for texture unit n-1 (where n is the
number of supported texture units) is assigned either DOT_PRODUCT_NV
or DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV.
INVALID_OPERATION is generated when GetTexImage is called with a
color format (one of RED, GREEN, BLUE, ALPHA, RGB, RGBA, LUMINANCE,
or LUMINANCE_ALPHA) when the texture image is of a format type (see
table 3.15) other than RGBA (the DSDT_MAG_INTENSITY_NV base internal
format does not count as an RGBA format type in this context).
INVALID_OPERATION is generated when GetTexImage is called with
a format of HILO when the texture image is of a format type (see
table 3.15) other than HILO.
INVALID_OPERATION is generated when GetTexImage is called with a
format of DSDT_NV when the texture image is of a base internal
format other than DSDT_NV.
INVALID_OPERATION is generated when GetTexImage is called with a
format of DSDT_MAG_NV when the texture image is of a base internal
format other than DSDT_MAG_NV.
INVALID_OPERATION is generated when GetTexImage is called with a
format of DSDT_MAG_VIBRANCE_NV when the texture image is of a base
internal format other than DSDT_MAG_INTENSITY_NV causes the error
INVALID_OPERATION."
New State
Table 6.TextureShaders. Texture Shaders.
Get Value Type Get Command Initial Value Description Sec Attribute
--------------------------- ------ ----------- -------------------- ------------------- ------ --------------
SHADER_OPERATION_NV TxZ23 GetTexEnviv NONE Texture shader 3.8.13 texture
operation
* Z21 in NV_texture_shader is now Z23 with NV_texture_shader2.
[ The "Tx" type prefix means that the state is per-texture unit. ]
[ The "Zn" type is an n-valued integer where n is the
implementation-dependent number of texture units supported.]
New Implementation State
None
Revision History
None
Implementation Support
List of OpenGL implementations supporting the GL_NV_texture_shader2 extension
Original File
Original text file for the GL_NV_texture_shader2 extension
Page generated on Sun Nov 20 18:39:27 2005