Last Modified Date: July 20, 2003
Author Revision: 1.0
- $Date: 2003/07/23 15:45:25 $ $Revision: 1.2 $
+ $Date: 2003/09/23 14:46:11 $ $Revision: 1.3 $
Number
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 glGet* commands to
+ 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).
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 (a)
- debugger(s) that layer on top of this extension.
+ 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
Accepted by the <cap> parameter of Enable, Disable, IsEnabled,
GetBooleanv, GetDoublev, GetFloatv and GetIntegerv:
- FRAGMENT_PROGRAM_CALLBACK_MESA 0x????
- VERTEX_PROGRAM_CALLBACK_MESA 0x????
+ FRAGMENT_PROGRAM_CALLBACK_MESA 0x8bb1
+ VERTEX_PROGRAM_CALLBACK_MESA 0x8bb4
Accepted by the <pname> parameter GetBooleanv, GetDoublev,
GetFloatv and GetIntegerv:
- FRAGMENT_PROGRAM_POSITION_MESA 0x????
- VERTEX_PROGRAM_POSITION_MESA 0x????
+ FRAGMENT_PROGRAM_POSITION_MESA 0x8bb0
+ VERTEX_PROGRAM_POSITION_MESA 0x8bb4
Accepted by the <pname> parameter of GetPointerv:
- FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA 0x????
- FRAGMENT_PROGRAM_CALLBACK_DATA_MESA 0x????
- VERTEX_PROGRAM_CALLBACK_FUNC_MESA 0x????
- VERTEX_PROGRAM_CALLBACK_DATA_MESA 0x????
+ 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)
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.
+
+ ProgramCallbackMESA.
Add a new section 5.7 "Callback Functions"
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. Callbacks 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>
+ 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
float *v)
Is used to query the value of program variables and registers
- during program execution. GetProgramRegisterMESA may only be
+ during program execution. GetProgramRegisterfvMESA may only be
called from within a callback function registered with
ProgramCallbackMESA.
- <registerName> and <len> specify the string name of a program
- register (such as "R3"), input attribute (such as "vertex.color"),
- an output attribute (such as "result.texcoord[0]") or a user-
- defined identifier. The current value of that variable is
- returned as four floats in <v>.
-
+ <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)
0x8BB0-0x8BBF
-
GL_MESA_packed_depth_stencil
- GL_DEPTH_STENCIL_MESA 0x8750
- GL_UNSIGNED_INT_24_8_MESA 0x8751
- GL_UNSIGNED_INT_8_24_REV_MESA 0x8752
- GL_UNSIGNED_SHORT_15_1_MESA 0x8753
- GL_UNSIGNED_SHORT_1_15_REV_MESA 0x8754
-
-
-GL_MESA_pack_invert.spec
- GL_PACK_INVERT_MESA 0x8758
-
-GL_MESA_program_debug.spec:
- GL_FRAGMENT_PROGRAM_CALLBACK_MESA 0x????
- GL_VERTEX_PROGRAM_CALLBACK_MESA 0x????
- GL_FRAGMENT_PROGRAM_POSITION_MESA 0x????
- GL_VERTEX_PROGRAM_POSITION_MESA 0x????
- GL_FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA 0x????
- GL_FRAGMENT_PROGRAM_CALLBACK_DATA_MESA 0x????
- GL_VERTEX_PROGRAM_CALLBACK_FUNC_MESA 0x????
- GL_VERTEX_PROGRAM_CALLBACK_DATA_MESA 0x????
+ GL_DEPTH_STENCIL_MESA 0x8750
+ GL_UNSIGNED_INT_24_8_MESA 0x8751
+ GL_UNSIGNED_INT_8_24_REV_MESA 0x8752
+ GL_UNSIGNED_SHORT_15_1_MESA 0x8753
+ GL_UNSIGNED_SHORT_1_15_REV_MESA 0x8754
GL_MESA_trace.spec:
GL_TRACE_ALL_BITS_MESA 0xFFFF
GL_TRACE_NAME_MESA 0x8756
MESA_ycbcr_texture.spec:
- GL_YCBCR_MESA 0x8757
- GL_UNSIGNED_SHORT_8_8_MESA 0x85BA /* same as Apple's */
- GL_UNSIGNED_SHORT_8_8_REV_MESA 0x85BB /* same as Apple's */
+ GL_YCBCR_MESA 0x8757
+ GL_UNSIGNED_SHORT_8_8_MESA 0x85BA /* same as Apple's */
+ GL_UNSIGNED_SHORT_8_8_REV_MESA 0x85BB /* same as Apple's */
+
+GL_MESA_pack_invert.spec
+ GL_PACK_INVERT_MESA 0x8758
+GL_MESA_program_debug.spec:
+ GL_FRAGMENT_PROGRAM_CALLBACK_MESA 0x????
+ GL_VERTEX_PROGRAM_CALLBACK_MESA 0x????
+ GL_FRAGMENT_PROGRAM_POSITION_MESA 0x????
+ GL_VERTEX_PROGRAM_POSITION_MESA 0x????
+ GL_FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA 0x????
+ GL_FRAGMENT_PROGRAM_CALLBACK_DATA_MESA 0x????
+ GL_VERTEX_PROGRAM_CALLBACK_FUNC_MESA 0x????
+ GL_VERTEX_PROGRAM_CALLBACK_DATA_MESA 0x????
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