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