ARB_texture_env_dot3
GL_ARB_texture_env_dot3
Bimal Poddar, Intel, bimal.poddar@intel.com
Dave Gosselin, ATI Technologies, Inc. (gosselin 'at' ati.com)
Dan Ginsburg, ATI Technologies, Inc. (dginsbur 'at' ati.com)
Complete. Approved by ARB on February 16, 2001.
Last modified date: 2001/05/15
ARB Extension #19
This extension is written against the OpenGL 1.2.1 Specification.
OpenGL 1.1, ARB_multitexture and ARB_texture_env_combine are required
for this extension.
Adds new operation to the texture combiner operations.
DOT3_RGB_ARB Arg0 <dotprod> Arg1
DOT3_RGBA_ARB Arg0 <dotprod> Arg1
where Arg0, Arg1 are specified by <params> parameter of
TexEnvf, TexEnvi, TexEnvfv, and TexEnviv when the <pname>
parameter value is SOURCE0_RGB_ARB and SOURCE1_RGB_ARB.
1. This extension is an ARB version of EXT_texture_env_dot3 which bears
a copyright by ATI Technologies. Is ATI willing to have the ARB
go ahead and modify their original spec and use it for the
ARB extension.
- RESOLVED: ATI does not have a problem with the copyright issue.
2. The EXT version of the spec does not multiply the output by
RGB_SCALE_ARB and ALPHA_SCALE_ARB. There is no reason to impose this
restriction since it makes the scale operations non-orthogonal.
Should the enum values for the new tokens in this extension should
be the same as the original EXT version?
- RESOLVED: No.
   New Procedures and Functions |
None
Accepted by the <params> parameter of TexEnvf, TexEnvi, TexEnvfv,
and TexEnviv when the <pname> parameter value is COMBINE_RGB_ARB
DOT3_RGB_ARB 0x86AE
DOT3_RGBA_ARB 0x86AF
| Additions to Chapter 2 of the GL Specification (OpenGL Operation) |
None
| Additions to Chapter 3 of the GL Specification (Rasterization) |
Added to table 3.20 of the ARB_texture_env_combine spec:
COMBINE_RGB_ARB Texture Function
--------------- ----------------
DOT3_RGB_ARB 4*((Arg0_r - 0.5)*(Arg1_r - 0.5) +
(Arg0_g - 0.5)*(Arg1_g - 0.5) +
(Arg0_b - 0.5)*(Arg1_b - 0.5))
This value is placed into all three
r,g,b components of the output.
DOT3_RGBA_ARB 4*((Arg0_r - 0.5)*(Arg1_r - 0.5) +
(Arg0_g - 0.5)*(Arg1_g - 0.5) +
(Arg0_b - 0.5)*(Arg1_b - 0.5))
This value is placed into all four
r,g,b,a components of the output. Note
that the result generated from
COMBINE_ALPHA_ARB function is ignored.
| Additions to Chapter 4 of the OpenGL 1.2 Specification (Per-Fragment Operations and the Framebuffer) |
None
| Additions to Chapter 5 of the GL Specification (Special Functions) |
None
| Additions to Chapter 6 of the GL Specification (State and State Requests) |
None
| Additions to the GLX Specification |
None
None
INVALID_ENUM is generated if <params> value for COMBINE_RGB_ARB
is not one of REPLACE, MODULATE, ADD, ADD_SIGNED_ARB,
INTERPOLATE_ARB, SUBTRACT_ARB, DOT3_RGB_ARB or DOT3_RGBA_ARB.
None
| New Implementation Dependent State |
None
01/05/15 bpoddar Fixed a mistake in the spec - DOT3_RGB_ARB and
DOT3_RGBA_ARB are not valid arguments when
<pname> parameter is COMBINE_ALPHA_ARB
01/02/02 bpoddar Added original EXT/ARB contributors to the contact
list
00/12/13 bpoddar Added enum values for DOT3_RGB_ARB and DOT3_RGBA_ARB
Added resolution to issue # 1.
00/12/06 bpoddar Fixed typos - EXT -> ARB, RED_SCALE -> RGB_SCALE
00/12/01 bpoddar Created an ARB version of the ARB_texture_env_dot3
by breaking up the proposed ARB_texture_env_combine
spec.
spec.
 |  | Last update: November 14, 2006.
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