glVertexAttribPointer man page on RedHat
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GLVERTEXATTRIBPOINTE(3G) OpenGL Manual GLVERTEXATTRIBPOINTE(3G)
NAME
glVertexAttribPointer - define an array of generic vertex attribute
data
C SPECIFICATION
void glVertexAttribPointer(GLuint index, GLint size, GLenum type,
GLboolean normalized, GLsizei stride,
const GLvoid * pointer);
void glVertexAttribIPointer(GLuint index, GLint size, GLenum type,
GLsizei stride, const GLvoid * pointer);
void glVertexAttribLPointer(GLuint index, GLint size, GLenum type,
GLsizei stride, const GLvoid * pointer);
PARAMETERS
index
Specifies the index of the generic vertex attribute to be modified.
size
Specifies the number of components per generic vertex attribute.
Must be 1, 2, 3, 4. Additionally, the symbolic constant GL_BGRA is
accepted by glVertexAttribPointer. The initial value is 4.
type
Specifies the data type of each component in the array. The
symbolic constants GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT,
GL_UNSIGNED_SHORT, GL_INT, and GL_UNSIGNED_INT are accepted by
glVertexAttribPointer and glVertexAttribIPointer. Additionally
GL_HALF_FLOAT, GL_FLOAT, GL_DOUBLE, GL_FIXED,
GL_INT_2_10_10_10_REV, and GL_UNSIGNED_INT_2_10_10_10_REV are
accepted by glVertexAttribPointer. GL_DOUBLE is also accepted by
glVertexAttribLPointer and is the only token accepted by the type
parameter for that function. The initial value is GL_FLOAT.
normalized
For glVertexAttribPointer, specifies whether fixed-point data
values should be normalized (GL_TRUE) or converted directly as
fixed-point values (GL_FALSE) when they are accessed.
stride
Specifies the byte offset between consecutive generic vertex
attributes. If stride is 0, the generic vertex attributes are
understood to be tightly packed in the array. The initial value is
0.
pointer
Specifies a offset of the first component of the first generic
vertex attribute in the array in the data store of the buffer
currently bound to the GL_ARRAY_BUFFER target. The initial value is
0.
DESCRIPTION
glVertexAttribPointer, glVertexAttribIPointer and
glVertexAttribLPointer specify the location and data format of the
array of generic vertex attributes at index index to use when
rendering. size specifies the number of components per attribute and
must be 1, 2, 3, 4, or GL_BGRA. type specifies the data type of each
component, and stride specifies the byte stride from one attribute to
the next, allowing vertices and attributes to be packed into a single
array or stored in separate arrays.
For glVertexAttribPointer, if normalized is set to GL_TRUE, it
indicates that values stored in an integer format are to be mapped to
the range [-1,1] (for signed values) or [0,1] (for unsigned values)
when they are accessed and converted to floating point. Otherwise,
values will be converted to floats directly without normalization.
For glVertexAttribIPointer, only the integer types GL_BYTE,
GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT
are accepted. Values are always left as integer values.
glVertexAttribLPointer specifies state for a generic vertex attribute
array associated with a shader attribute variable declared with 64-bit
double precision components. type must be GL_DOUBLE. index, size, and
stride behave as described for glVertexAttribPointer and
glVertexAttribIPointer.
If pointer is not NULL, a non-zero named buffer object must be bound to
the GL_ARRAY_BUFFER target (see glBindBuffer()), otherwise an error is
generated. pointer is treated as a byte offset into the buffer
object's data store. The buffer object binding
(GL_ARRAY_BUFFER_BINDING) is saved as generic vertex attribute array
state (GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING) for index index.
When a generic vertex attribute array is specified, size, type,
normalized, stride, and pointer are saved as vertex array state, in
addition to the current vertex array buffer object binding.
To enable and disable a generic vertex attribute array, call
glEnableVertexAttribArray() and glDisableVertexAttribArray() with
index. If enabled, the generic vertex attribute array is used when
glDrawArrays(), glMultiDrawArrays(), glDrawElements(),
glMultiDrawElements(), or glDrawRangeElements() is called.
NOTES
Each generic vertex attribute array is initially disabled and isn't
accessed when glDrawElements(), glDrawRangeElements(), glDrawArrays(),
glMultiDrawArrays(), or glMultiDrawElements() is called.
ERRORS
GL_INVALID_VALUE is generated if index is greater than or equal to
GL_MAX_VERTEX_ATTRIBS.
GL_INVALID_VALUE is generated if size is not 1, 2, 3, 4 or (for
glVertexAttribPointer), GL_BGRA.
GL_INVALID_ENUM is generated if type is not an accepted value.
GL_INVALID_VALUE is generated if stride is negative.
GL_INVALID_OPERATION is generated if size is GL_BGRA and type is not
GL_UNSIGNED_BYTE, GL_INT_2_10_10_10_REV or
GL_UNSIGNED_INT_2_10_10_10_REV.
GL_INVALID_OPERATION is generated if type is GL_INT_2_10_10_10_REV or
GL_UNSIGNED_INT_2_10_10_10_REV and size is not 4 or GL_BGRA.
GL_INVALID_OPERATION is generated by glVertexAttribPointer if size is
GL_BGRA and noramlized is GL_FALSE.
GL_INVALID_OPERATION is generated if zero is bound to the
GL_ARRAY_BUFFER buffer object binding point and the pointer argument is
not NULL.
ASSOCIATED GETS
glGet() with argument GL_MAX_VERTEX_ATTRIBS
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_ENABLED
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_SIZE
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_TYPE
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_NORMALIZED
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_STRIDE
glGetVertexAttrib() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING
glGet() with argument GL_ARRAY_BUFFER_BINDING
glGetVertexAttribPointerv() with arguments index and
GL_VERTEX_ATTRIB_ARRAY_POINTER
SEE ALSO
glBindAttribLocation(), glBindBuffer(), glDisableVertexAttribArray(),
glDrawArrays(), glDrawElements(), glDrawRangeElements(),
glEnableVertexAttribArray(), glMultiDrawArrays(),
glMultiDrawElements(), glVertexAttrib()
COPYRIGHT
Copyright © 2003-2005 3Dlabs Inc. Ltd. 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLVERTEXATTRIBPOINTE(3G)
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