| Name |
| |
| ARB_texture_env_dot3 |
| |
| Name Strings |
| |
| GL_ARB_texture_env_dot3 |
| |
| Contact |
| |
| Bimal Poddar, Intel (bimal.poddar 'at' intel.com) |
| Dave Gosselin |
| Dan Ginsburg, AMD (dan.ginsburg 'at' amd.com) |
| |
| Notice |
| |
| Copyright (c) 2001-2013 The Khronos Group Inc. Copyright terms at |
| http://www.khronos.org/registry/speccopyright.html |
| |
| Specification Update Policy |
| |
| Khronos-approved extension specifications are updated in response to |
| issues and bugs prioritized by the Khronos OpenGL Working Group. For |
| extensions which have been promoted to a core Specification, fixes will |
| first appear in the latest version of that core Specification, and will |
| eventually be backported to the extension document. This policy is |
| described in more detail at |
| https://www.khronos.org/registry/OpenGL/docs/update_policy.php |
| |
| Status |
| |
| Complete. Approved by ARB on February 16, 2001. |
| |
| Version |
| |
| Last modified date: 2006/11/04 |
| |
| Number |
| |
| ARB Extension #19 |
| |
| Dependencies |
| |
| 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. |
| |
| Overview |
| |
| 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. |
| |
| Issues |
| |
| 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 |
| |
| New Tokens |
| |
| 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 |
| |
| GLX Protocol |
| |
| None |
| |
| Errors |
| |
| 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. |
| |
| New State |
| |
| None |
| |
| New Implementation Dependent State |
| |
| None |
| |
| Revision History |
| 06/11/04 benj Updated contact info after ATI/AMD merger. |
| |
| 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. |
