GLGETVERTEXATTRIB - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]

NAMEglGetVertexAttribdv, glGetVertexAttribfv, glGetVertexAttribiv, glGetVertexAttribIiv, glGetVertexAttribIuiv, glGetVertexAttribLdv − Return a generic vertex attribute parameter

C SPECIFICATIONvoid glGetVertexAttribdv(GLuint index, GLenum pname, GLdouble *params); void glGetVertexAttribfv(GLuint index, GLenum pname, GLfloat *params); void glGetVertexAttribiv(GLuint index, GLenum pname, GLint *params); void glGetVertexAttribIiv(GLuint index, GLenum pname, GLint *params); void glGetVertexAttribIuiv(GLuint index, GLenum pname, GLuint *params); void glGetVertexAttribLdv(GLuint index, GLenum pname, GLdouble *params);

PARAMETERSindex Specifies the generic vertex attribute parameter to be queried​. pname Specifies the symbolic name of the vertex attribute parameter to be queried​. Accepted values are GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, GL_VERTEX_ATTRIB_ARRAY_ENABLED, GL_VERTEX_ATTRIB_ARRAY_SIZE, GL_VERTEX_ATTRIB_ARRAY_STRIDE, GL_VERTEX_ATTRIB_ARRAY_TYPE, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, GL_VERTEX_ATTRIB_ARRAY_INTEGER, GL_VERTEX_ATTRIB_ARRAY_DIVISOR, or GL_CURRENT_VERTEX_ATTRIB​. params Returns the requested data​.

DESCRIPTIONglGetVertexAttrib returns in params the value of a generic vertex attribute parameter​. The generic vertex attribute to be queried is specified by index, and the parameter to be queried is specified by pname​. The accepted parameter names are as follows: GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING params returns a single value, the name of the buffer object currently bound to the binding point corresponding to generic vertex attribute array index​. If no buffer object is bound, 0 is returned​. The initial value is 0​. GL_VERTEX_ATTRIB_ARRAY_ENABLED params returns a single value that is non−zero (true) if the vertex attribute array for index is enabled and 0 (false) if it is disabled​. The initial value is GL_FALSE​. GL_VERTEX_ATTRIB_ARRAY_SIZE params returns a single value, the size of the vertex attribute array for index​. The size is the number of values for each element of the vertex attribute array, and it will be 1, 2, 3, or 4​. The initial value is 4​. GL_VERTEX_ATTRIB_ARRAY_STRIDE params returns a single value, the array stride for (number of bytes between successive elements in) the vertex attribute array for index​. A value of 0 indicates that the array elements are stored sequentially in memory​. The initial value is 0​. GL_VERTEX_ATTRIB_ARRAY_TYPE params returns a single value, a symbolic constant indicating the array type for the vertex attribute array for index​. Possible values are GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT, GL_FLOAT, and GL_DOUBLE​. The initial value is GL_FLOAT​. GL_VERTEX_ATTRIB_ARRAY_NORMALIZED params returns a single value that is non−zero (true) if fixed−point data types for the vertex attribute array indicated by index are normalized when they are converted to floating point, and 0 (false) otherwise​. The initial value is GL_FALSE​. GL_VERTEX_ATTRIB_ARRAY_INTEGER params returns a single value that is non−zero (true) if fixed−point data types for the vertex attribute array indicated by index have integer data types, and 0 (false) otherwise​. The initial value is 0 (GL_FALSE)​. GL_VERTEX_ATTRIB_ARRAY_DIVISOR params returns a single value that is the frequency divisor used for instanced rendering​. See glVertexAttribDivisor()​. The initial value is 0​. GL_CURRENT_VERTEX_ATTRIB params returns four values that represent the current value for the generic vertex attribute specified by index​. Generic vertex attribute 0 is unique in that it has no current state, so an error will be generated if index is 0​. The initial value for all other generic vertex attributes is (0,0,0,1)​. glGetVertexAttribdv and glGetVertexAttribfv return the current attribute values as four single−precision floating−point values; glGetVertexAttribiv reads them as floating−point values and converts them to four integer values; glGetVertexAttribIiv and glGetVertexAttribIuiv read and return them as signed or unsigned integer values, respectively; glGetVertexAttribLdv reads and returns them as four double−precision floating−point values​. All of the parameters except GL_CURRENT_VERTEX_ATTRIB represent state stored in the currently bound vertex array object​.

NOTESIf an error is generated, no change is made to the contents of params​.

ERRORSGL_INVALID_OPERATION is generated if pname is not GL_CURRENT_VERTEX_ATTRIB and there is no currently bound vertex array object​. GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS​. GL_INVALID_ENUM is generated if pname is not an accepted value​. GL_INVALID_OPERATION is generated if index is 0 and pname is GL_CURRENT_VERTEX_ATTRIB​.

ASSOCIATED GETSglGet() with argument GL_MAX_VERTEX_ATTRIBS glGetVertexAttribPointerv() with arguments index and GL_VERTEX_ATTRIB_ARRAY_POINTER

VERSION SUPPORT OpenGL Version Function / Feature Name 2​.0 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 2​.1 3​.0 3​.1 3​.2 3​.3 4​.0 4​.1 4​.2 4​.3 4​.4 4​.5 glGetVertexAttribIiv glGetVertexAttribIuiv glGetVertexAttribLdv glGetVertexAttribdv glGetVertexAttribfv glGetVertexAttribiv

SEE ALSOglBindAttribLocation(), glBindBuffer(), glDisableVertexAttribArray, glEnableVertexAttribArray(), glVertexAttrib(), glVertexAttribDivisor(), glVertexAttribPointer()

COPYRIGHTCopyright © 2003−2005 3Dlabs Inc​. Ltd​. Copyright © 2010−2014 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/​.

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Copyright © 2010-2014 Khronos Group
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