glbindfragdatalocation(3g) [osx man page]
GLBINDFRAGDATALOCATI(3G) OpenGL 3.3 GLBINDFRAGDATALOCATI(3G) NAME
glBindFragDataLocation - bind a user-defined varying out variable to a fragment shader color number C SPECIFICATION
void glBindFragDataLocation(GLuint program, GLuint colorNumber, const char * name); PARAMETERS
program The name of the program containing varying out variable whose binding to modify colorNumber The color number to bind the user-defined varying out variable to name The name of the user-defined varying out variable whose binding to modify DESCRIPTION
glBindFragDataLocation explicitly specifies the binding of the user-defined varying out variable name to fragment shader color number colorNumber for program program. If name was bound previously, its assigned binding is replaced with colorNumber. name must be a null-terminated string. colorNumber must be less than GL_MAX_DRAW_BUFFERS. The bindings specified by glBindFragDataLocation have no effect until program is next linked. Bindings may be specified at any time after program has been created. Specifically, they may be specified before shader objects are attached to the program. Therefore, any name may be specified in name, including a name that is never used as a varying out variable in any fragment shader object. Names beginning with gl_ are reserved by the GL. In addition to the errors generated by glBindFragDataLocation, the program program will fail to link if: o The number of active outputs is greater than the value GL_MAX_DRAW_BUFFERS. o More than one varying out variable is bound to the same color number. NOTES
Varying out varyings may have indexed locations assigned explicitly in the shader text using a location layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text, that location is used and any location assigned with glBindFragDataLocation is ignored. ERRORS
GL_INVALID_VALUE is generated if colorNumber is greater than or equal to GL_MAX_DRAW_BUFFERS. GL_INVALID_OPERATION is generated if name starts with the reserved gl_ prefix. GL_INVALID_OPERATION is generated if program is not the name of a program object. ASSOCIATED GETS
glGetFragDataLocation() with a valid program object and the the name of a user-defined varying out variable SEE ALSO
glCreateProgram(), glGetFragDataLocation() COPYRIGHT
Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/. OpenGL 3.3 03/08/2011 GLBINDFRAGDATALOCATI(3G)
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GLTRANSFORMFEEDBACKV(3G) OpenGL 3.3 GLTRANSFORMFEEDBACKV(3G) NAME
glTransformFeedbackVaryings - specify values to record in transform feedback buffers C SPECIFICATION
void glTransformFeedbackVaryings(GLuintprogram, GLsizeicount, const char **varyings, GLenumbufferMode); PARAMETERS
program The name of the target program object. count The number of varying variables used for transform feedback. varyings An array of count zero-terminated strings specifying the names of the varying variables to use for transform feedback. bufferMode Identifies the mode used to capture the varying variables when transform feedback is active. bufferMode must be GL_INTERLEAVED_ATTRIBS or GL_SEPARATE_ATTRIBS. DESCRIPTION
The names of the vertex or geometry shader outputs to be recorded in transform feedback mode are specified using glTransformFeedbackVaryings. When a geometry shader is active, transform feedback records the values of selected geometry shader output variables from the emitted vertices. Otherwise, the values of the selected vertex shader outputs are recorded. The state set by glTranformFeedbackVaryings is stored and takes effect next time glLinkProgram() is called on program. When glLinkProgram() is called, program is linked so that the values of the specified varying variables for the vertices of each primitive generated by the GL are written to a single buffer object if bufferMode is GL_INTERLEAVED_ATTRIBS or multiple buffer objects if bufferMode is GL_SEPARATE_ATTRIBS. In addition to the errors generated by glTransformFeedbackVaryings, the program program will fail to link if: o The count specified by glTransformFeedbackVaryings is non-zero, but the program object has no vertex or geometry shader. o Any variable name specified in the varyings array is not declared as an output in the vertex shader (or the geometry shader, if active). o Any two entries in the varyings array specify the same varying variable. o The total number of components to capture in any varying variable in varyings is greater than the constant GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS and the buffer mode is GL_SEPARATE_ATTRIBS. o The total number of components to capture is greater than the constant GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS and the buffer mode is GL_INTERLEAVED_ATTRIBS. NOTES
glGetTransformFeedbackVarying is available only if the GL version is 3.0 or greater. ERRORS
GL_INVALID_VALUE is generated if program is not the name of a program object. GL_INVALID_VALUE is generated if bufferMode is GL_SEPARATE_ATTRIBS and count is greater than the implementation-dependent limit GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS. ASSOCIATED GETS
glGetTransformFeedbackVarying() SEE ALSO
glBeginTransformFeedback(), glEndTransformFeedback(), glGetTransformFeedbackVarying() COPYRIGHT
Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/. OpenGL 3.3 03/08/2011 GLTRANSFORMFEEDBACKV(3G)