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-Name
-
-    MESA_program_debug
-
-Name Strings
-
-    GL_MESA_program_debug
-
-Contact
-
-    Brian Paul (brian.paul 'at' tungstengraphics.com)
-
-Status
-
-    XXX - Not complete yet!!!
-
-Version
-
-    Last Modified Date: July 20, 2003
-    Author Revision: 1.0
-    $Date: 2004/08/12 23:43:24 $ $Revision: 1.1.1.3 $
-
-Number
-
-    TBD
-
-Dependencies
-
-    OpenGL 1.4 is required
-    The extension is written against the OpenGL 1.4 specification.
-    ARB_vertex_program or ARB_fragment_program or NV_vertex_program
-    or NV_fragment_program is required.
-
-Overview
-
-    The extension provides facilities for implementing debuggers for
-    vertex and fragment programs.
-
-    The concept is that vertex and fragment program debuggers will be
-    implemented outside of the GL as a utility package.  This extension
-    only provides the minimal hooks required to implement a debugger.
-
-    There are facilities to do the following:
-    1. Have the GL call a user-specified function prior to executing
-       each vertex or fragment instruction.
-    2. Query the current program string's execution position.
-    3. Query the current values of intermediate program values.
-
-    The main feature is the ProgramCallbackMESA function.  It allows the
-    user to register a callback function with the GL.  The callback will
-    be called prior to executing each vertex or fragment program instruction.
-
-    From within the callback, the user may issue Get* commands to
-    query current GL state.  The GetProgramRegisterfvMESA function allows
-    current program values to be queried (such as temporaries, input
-    attributes, and result registers).
-
-    There are flags for enabling/disabling the program callbacks.
-
-    The current execution position (as an offset from the start of the
-    program string) can be queried with
-    GetIntegerv(GL_FRAGMENT_PROGRAM_POSITION_MESA, &pos) or
-    GetIntegerv(GL_VERTEX_PROGRAM_POSITION_MESA, &pos).
-
-
-IP Status
-
-    None
-
-Issues
-
-    1. Is this the right model for a debugger?
-
-       It seems prudent to minimize the scope of this extension and leave
-       it up to the developer (or developer community) to write debuggers
-       that layer on top of this extension.
-
-       If the debugger were fully implemented within the GL it's not
-       clear how terminal and GUI-based interfaces would work, for
-       example.
-
-    2. There aren't any other extensions that register callbacks with
-       the GL.  Isn't there another solution?
-
-       If we want to be able to single-step through vertex/fragment
-       programs I don't see another way to do it.
-
-    3. How do we prevent the user from doing something crazy in the
-       callback function, like trying to call glBegin (leading to
-       recursion)?
-
-       The rule is that the callback function can only issue glGet*()
-       functions and no other GL commands.  It could be difficult to
-       enforce this, however.  Therefore, calling any non-get GL
-       command from within the callback will result in undefined
-       results.    
-
-    4. Is this extension amenable to hardware implementation?
-
-       Hopefully, but if not, the GL implementation will have to fall
-       back to a software path when debugging.  This may be acceptable
-       for debugging.
-
-    5. What's the <data> parameter to ProgramCallbackMESA for?
-
-       It's a common programming practice to associate a user-supplied
-       value with callback functions.
-
-    6. Debuggers often allow one to modify intermediate program values,
-       then continue.  Does this extension support that?
-
-       No.
-
-
-New Procedures and Functions (and datatypes)
-
-    typedef void (*programcallbackMESA)(enum target, void *data)
-
-    void ProgramCallbackMESA(enum target, programcallbackMESA callback,
-                             void *data)
-
-    void GetProgramRegisterfvMESA(enum target, sizei len,
-                                  const ubyte *registerName, float *v)
-
-New Tokens
-
-    Accepted by the <cap> parameter of Enable, Disable, IsEnabled,
-    GetBooleanv, GetDoublev, GetFloatv and GetIntegerv:
-
-        FRAGMENT_PROGRAM_CALLBACK_MESA      0x8bb1
-        VERTEX_PROGRAM_CALLBACK_MESA        0x8bb4
-
-    Accepted by the <pname> parameter GetBooleanv, GetDoublev,
-    GetFloatv and GetIntegerv:
-
-        FRAGMENT_PROGRAM_POSITION_MESA      0x8bb0
-        VERTEX_PROGRAM_POSITION_MESA        0x8bb4
-
-    Accepted by the <pname> parameter of GetPointerv:
-
-        FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA 0x8bb2
-        FRAGMENT_PROGRAM_CALLBACK_DATA_MESA 0x8bb3
-        VERTEX_PROGRAM_CALLBACK_FUNC_MESA   0x8bb6
-        VERTEX_PROGRAM_CALLBACK_DATA_MESA   0x8bb7
-
-Additions to Chapter 2 of the OpenGL 1.4 Specification (OpenGL Operation)
-
-    None.
-
-Additions to Chapter 3 of the OpenGL 1.4 Specification (Rasterization)
-
-    None.
-
-Additions to Chapter 4 of the OpenGL 1.4 Specification (Per-Fragment
-Operations and the Frame Buffer)
-
-    None.
-
-Additions to Chapter 5 of the OpenGL 1.4 Specification (Special Functions)
-
-    In section 5.4 "Display Lists", page 202, add the following command
-    to the list of those that are not compiled into display lists:
-
-        ProgramCallbackMESA.
-
-
-    Add a new section 5.7 "Callback Functions"
-
-    The function
-
-        void ProgramCallbackMESA(enum target, programcallbackMESA callback,
-                                 void *data)
-
-    registers a user-defined callback function with the GL.  <target>
-    may be FRAGMENT_PROGRAM_ARB or VERTEX_PROGRAM_ARB.  The enabled
-    callback functions registered with these targets will be called
-    prior to executing each instruction in the current fragment or
-    vertex program, respectively.  The callbacks are enabled and
-    disabled by calling Enable or Disable with <cap>
-    FRAGMENT_PROGRAM_ARB or VERTEX_PROGRAM_ARB.
-
-    The callback function's signature must match the typedef
-
-        typedef void (*programcallbackMESA)(enum target, void *data)
-
-    When the callback function is called, <target> will either be
-    FRAGMENT_PROGRAM_ARB or VERTEX_PROGRAM_ARB to indicate which
-    program is currently executing and <data> will be the value
-    specified when ProgramCallbackMESA was called.
-
-    From within the callback function, only the following GL commands
-    may be called:
-
-        GetBooleanv
-        GetDoublev
-        GetFloatv
-        GetIntegerv
-        GetProgramLocalParameter
-        GetProgramEnvParameter
-        GetProgramRegisterfvMESA
-        GetProgramivARB
-        GetProgramStringARB
-        GetError
-
-    Calling any other command from within the callback results in
-    undefined behaviour.
-
-
-Additions to Chapter 6 of the OpenGL 1.4 Specification (State and
-State Requests)
-
-    Add a new section 6.1.3 "Program Value Queries":
-
-    The command
-
-        void GetProgramRegisterfvMESA(enum target, sizei len,
-                                      const ubyte *registerName,
-                                      float *v)
-        
-    Is used to query the value of program variables and registers
-    during program execution.  GetProgramRegisterfvMESA may only be
-    called from within a callback function registered with
-    ProgramCallbackMESA.
-
-    <registerName> and <len> specify the name a variable, input
-    attribute, temporary, or result register in the program string.
-    The current value of the named variable is returned as four
-    values in <v>.  If <name> doesn't exist in the program string,
-    the error INVALID_OPERATION is generated.
-
-Additions to Appendix A of the OpenGL 1.4 Specification (Invariance)
-
-    None.
-
-Additions to the AGL/GLX/WGL Specifications
-
-    None.
-
-GLX Protocol
-
-    XXX TBD
-
-Dependencies on NV_vertex_program and NV_fragment_program
-
-    If NV_vertex_program and/or NV_fragment_program are supported,
-    vertex and/or fragment programs defined by those extensions may
-    be debugged as well.  Register queries will use the syntax used
-    by those extensions (i.e. "v[X]" to query vertex attributes,
-    "o[X]" for vertex outputs, etc.)
-
-Errors
-
-    INVALID_OPERATION is generated if ProgramCallbackMESA is called
-    between Begin and End.
-
-    INVALID_ENUM is generated by ProgramCallbackMESA if <target> is not
-    a supported vertex or fragment program type.
-
-    Note: INVALID_OPERAION IS NOT generated by GetProgramRegisterfvMESA,
-    GetBooleanv, GetDoublev, GetFloatv, or GetIntegerv if called between
-    Begin and End when a vertex or fragment program is currently executing.
-
-    INVALID_ENUM is generated by ProgramCallbackMESA,
-    GetProgramRegisterfvMESA if <target> is not a program target supported
-    by ARB_vertex_program, ARB_fragment_program (or NV_vertex_program or
-    NV_fragment_program).
-
-    INVALID_VALUE is generated by GetProgramRegisterfvMESA if <registerName>
-    does not name a known program register or variable.
-
-    INVALID_OPERATION is generated by GetProgramRegisterfvMESA when a
-    register query is attempted for a program target that's not currently
-    being executed.
-
-
-New State
-
-    XXX finish
-
-(table 6.N, p. ###)
-                                                            Initial
-    Get Value                            Type Get Command   Value    Description  Sec.  Attribute
-    ---------                            ---- -----------   -----    -----------  ----  ---------
-    FRAGMENT_PROGRAM_CALLBACK_MESA        B   IsEnabled     FALSE    XXX          XXX   enable
-    VERTEX_PROGRAM_CALLBACK_MESA          B   IsEnabled     FALSE    XXX          XXX   enable
-    FRAGMENT_PROGRAM_POSITION_MESA        Z+  GetIntegerv   -1       XXX          XXX   -
-    VERTEX_PROGRAM_POSITION_MESA          Z+  GetIntegerv   -1       XXX          XXX   -
-    FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA   P   GetPointerv   NULL     XXX          XXX   -
-    VERTEX_PROGRAM_CALLBACK_FUNC_MESA     P   GetPointerv   NULL     XXX          XXX   -
-    FRAGMENT_PROGRAM_CALLBACK_DATA_MESA   P   GetPointerv   NULL     XXX          XXX   -
-    VERTEX_PROGRAM_CALLBACK_DATA_MESA     P   GetPointerv   NULL     XXX          XXX   -
-
-    XXX more?
-
-New Implementation Dependent State
-
-    None.
-
-Revision History
-
-    8 July 2003
-        Initial draft. (Brian Paul)
-    11 July 2003
-        Second draft. (Brian Paul)
-    20 July 2003
-        Third draft.  Lots of fundamental changes. (Brian Paul)
-    23 July 2003
-        Added chapter 5 and 6 spec language. (Brian Paul)
-
-Example Usage
-
-   The following is a very simple example of how this extension may
-   be used to print the values of R0, R1, R2 and R3 while executing
-   vertex programs.
-
-
-    /* This is called by the GL when the vertex program is executing.
-     * We can only make glGet* calls from within this function!
-     */
-    void DebugCallback(GLenum target, GLvoid *data)
-    {
-       GLint pos;
-       GLuint i;
-
-       /* Get PC and current instruction string */
-       glGetIntegerv(GL_VERTEX_PROGRAM_POSITION_ARB, &pos);
-
-       printf("Current position: %d\n", pos);
-
-       printf("Current temporary registers:\n");
-       for (i = 0; i < 4; i++) {
-	  GLfloat v[4];
-	  char s[10];
-	  sprintf(s, "R%d", i);
-	  glGetProgramRegisterfvMESA(GL_VERTEX_PROGRAM_ARB, strlen(s), s, v);
-	  printf("R%d = %g, %g, %g, %g\n", i, v[0], v[1], v[2], v[3]);
-       }
-    }
-
-
-    /*
-     * elsewhere...
-     */
-
-    /* Register our debugger callback function */
-    glProgramCallbackMESA(GL_VERTEX_PROGRAM_ARB, DebugCallback, NULL);
-    glEnable(GL_VERTEX_PROGRAM_CALLBACK_MESA);
-
-    /* define/bind a vertex program */
-
-    glEnable(GL_VERTEX_PROGRAM);
-
-    /* render something */
-    glBegin(GL_POINTS);
-    glVertex2f(0, 0);
-    glEnd();
-