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homeprevnext Name
homeprevnext Name Strings
homeprevnext Contact
    Bimal Poddar, Intel,  
    Dave Gosselin, ATI Technologies, Inc. (gosselin 'at'  
    Dan Ginsburg, ATI Technologies, Inc. (dginsbur 'at'  
homeprevnext Status
    Complete. Approved by ARB on February 16, 2001.  
homeprevnext Version
    Last modified date: 2001/05/15  
homeprevnext Number
    ARB Extension #19  
homeprevnext 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.  
homeprevnext 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.  
homeprevnext 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.  
homeprevnext New Procedures and Functions
homeprevnext 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  
homeprevnext Additions to Chapter 2 of the GL Specification (OpenGL Operation)
homeprevnext 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.  
homeprevnext Additions to Chapter 4 of the OpenGL 1.2 Specification (Per-Fragment Operations and the Framebuffer)
homeprevnext Additions to Chapter 5 of the GL Specification (Special Functions)
homeprevnext Additions to Chapter 6 of the GL Specification (State and State Requests)
homeprevnext Additions to the GLX Specification
homeprevnext GLX Protocol
homeprevnext Errors
    INVALID_ENUM is generated if <params> value for COMBINE_RGB_ARB  
    is not one of REPLACE, MODULATE, ADD, ADD_SIGNED_ARB,   
homeprevnext New State
homeprevnext New Implementation Dependent State
homeprevnext Revision History
    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  
    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  
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