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+Name
+
+    MESA_shader_debug
+
+Name Strings
+
+    GL_MESA_shader_debug
+
+Contact
+
+    Brian Paul (brian.paul 'at' tungstengraphics.com)
+    Michal Krol (mjkrol 'at' gmail.com)
+
+Status
+
+    Obsolete.
+
+Version
+
+    Last Modified Date: July 30, 2006
+    Author Revision: 0.2
+
+Number
+
+    TBD
+
+Dependencies
+
+    OpenGL 1.0 is required.
+
+    The ARB_shader_objects extension is required.
+
+    The ARB_shading_language_100 extension is required.
+
+    The extension is written against the OpenGL 1.5 specification.
+
+    The extension is written against the OpenGL Shading Language 1.10
+    Specification.
+
+Overview
+
+    This extension introduces a debug object that can be attached to
+    a program object to enable debugging. Vertex and/or fragment shader,
+    during execution, issue diagnostic function calls that are logged
+    to the debug object's log. A separate debug log for each shader type
+    is maintained. A debug object can be attached, detached and queried
+    at any time outside the Begin/End pair. Multiple debug objects can
+    be attached to a single program object.
+
+IP Status
+
+    None
+
+Issues
+
+    None
+
+New Procedures and Functions
+
+    handleARB CreateDebugObjectMESA(void)
+    void ClearDebugLogMESA(handleARB obj, enum logType, enum shaderType)
+    void GetDebugLogMESA(handleARB obj, enum logType, enum shaderType,
+                         sizei maxLength, sizei *length,
+                         charARB *debugLog)
+    sizei GetDebugLogLengthMESA(handleARB obj, enum logType,
+                                enum shaderType)
+
+New Types
+
+    None
+
+New Tokens
+
+    Returned by the <params> parameter of GetObjectParameter{fi}vARB:
+
+        DEBUG_OBJECT_MESA                               0x8759
+
+    Accepted by the <logType> argument of ClearDebugLogMESA,
+    GetDebugLogLengthMESA and GetDebugLogMESA:
+
+        DEBUG_PRINT_MESA                                0x875A
+        DEBUG_ASSERT_MESA                               0x875B
+
+Additions to Chapter 2 of the OpenGL 1.5 Specification
+(OpenGL Operation)
+
+    None
+
+Additions to Chapter 3 of the OpenGL 1.5 Specification (Rasterization)
+
+    None
+
+Additions to Chapter 4 of the OpenGL 1.5 Specification (Per-Fragment
+Operations and the Frame Buffer)
+
+    None
+
+Additions to Chapter 5 of the OpenGL 1.5 Specification
+(Special Functions)
+
+    None
+
+Additions to Chapter 6 of the OpenGL 1.5 Specification (State and State
+Requests)
+
+    None
+
+Additions to Appendix A of the OpenGL 1.5 Specification (Invariance)
+
+    None
+
+Additions to Chapter 1 of the OpenGL Shading Language 1.10 Specification
+(Introduction)
+
+    None
+
+Additions to Chapter 2 of the OpenGL Shading Language 1.10 Specification
+(Overview of OpenGL Shading)
+
+    None
+
+Additions to Chapter 3 of the OpenGL Shading Language 1.10 Specification
+(Basics)
+
+    None
+
+Additions to Chapter 4 of the OpenGL Shading Language 1.10 Specification
+(Variables and Types)
+
+    None
+
+Additions to Chapter 5 of the OpenGL Shading Language 1.10 Specification
+(Operators and Expressions)
+
+    None
+
+Additions to Chapter 6 of the OpenGL Shading Language 1.10 Specification
+(Statements and Structure)
+
+    None
+
+Additions to Chapter 7 of the OpenGL Shading Language 1.10 Specification
+(Built-in Variables)
+
+    None
+
+Additions to Chapter 8 of the OpenGL Shading Language 1.10 Specification
+(Built-in Functions)
+
+    Add a new section 8.10 "Debug Functions":
+
+    Debug functions are available to both fragment and vertex shaders.
+    They are used to track the execution of a shader by logging
+    passed-in arguments to the debug object's log. Those values can be
+    retrieved by the application for inspection after shader execution
+    is complete.
+
+    The text, if any, produced by any of these functions is appended
+    to each debug object that is attached to the program object.
+    There are different debug log types
+
+    Add a new section 8.10.1 "Print Function":
+
+    The following printMESA prototypes are available.
+
+        void printMESA(const float value)
+        void printMESA(const int value)
+        void printMESA(const bool value)
+        void printMESA(const vec2 value)
+        void printMESA(const vec3 value)
+        void printMESA(const vec4 value)
+        void printMESA(const ivec2 value)
+        void printMESA(const ivec3 value)
+        void printMESA(const ivec4 value)
+        void printMESA(const bvec2 value)
+        void printMESA(const bvec3 value)
+        void printMESA(const bvec4 value)
+        void printMESA(const mat2 value)
+        void printMESA(const mat3 value)
+        void printMESA(const mat4 value)
+        void printMESA(const sampler1D value)
+        void printMESA(const sampler2D value)
+        void printMESA(const sampler3D value)
+        void printMESA(const samplerCube value)
+        void printMESA(const sampler1DShadow value)
+        void printMESA(const sampler2DShadow value)
+
+    The printMESA function writes the argument <value> to the "debug
+    print log" (XXX DEBUG_PRINT_MESA?). Each component is written in
+    text format (XXX format!) and is delimited by a white space (XXX 1
+    or more?).
+
+    Add a new section 8.10.2 "Assert Function":
+
+    The following assertMESA prototypes are available.
+
+        void assertMESA(const bool condition)
+        void assertMESA(const bool condition, const int cookie)
+        void assertMESA(const bool condition, const int cookie,
+                        const int file, const int line)
+
+    The assertMESA function checks if the argument <condition> is
+    true or false. If it is true, nothing happens. If it is false,
+    a diagnostic message is written to the "debug assert log".
+    The message contains the argument <file>, <line>, <cookie> and
+    implementation dependent double-quoted string, each of this
+    delimited by a white space. If the argument <cookie> is not present,
+    it is meant as if it was of value 0. If the arguments <file> and
+    <line> are not present, they are meant as if they were of values
+    __FILE__ and __LINE__, respectively. The following three calls
+    produce the same output, assuming they were issued from the same
+    file and line.
+
+        assertMESA (false);
+        assertMESA (false, 0);
+        assertMESA (false, 0, __FILE__, __LINE__);
+
+    The diagnostic message examples follow.
+
+        1 89 0 ""
+        1 45 333 "all (lessThanEqual (fragColor, vec4 (1.0)))"
+        1 66 1 "assertion failed in file 1, line 66, cookie 1"
+
+Additions to Chapter 9 of the OpenGL Shading Language 1.10 Specification
+(Shading Language Grammar)
+
+    None
+
+Additions to Chapter 10 of the OpenGL Shading Language 1.10
+Specification (Issues)
+
+    None
+
+Additions to the AGL/EGL/GLX/WGL Specifications
+
+    None
+
+GLX Protocol
+
+    None
+
+Errors
+
+    TBD
+
+New State
+
+    TBD
+
+New Implementation Dependent State
+
+    TBD
+
+Sample Code
+
+    TBD
+
+Revision History
+
+    29 May 2006
+        Initial draft. (Michal Krol)
+    30 July 2006
+        Add Overview, New Procedures and Functions, New Tokens sections.
+        Add sections 8.10.1, 8.10.2 to GLSL spec.