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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: 2004/03/25 01:42:41 $ $Revision: 1.4 $
+
+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();
+