GLINDEXPOINTER - Online Linux Manual PageSection : 3G
NAME"glIndexPointer − define an array of color indexes
C SPECIFICATIONvoid glIndexPointer( GLenum type, GLsizei stride, const GLvoid *ptr )
PARAMETERStype  Specifies the data type of each color index in the array. Symbolic constants ­GL_UNSIGNED_BYTE, ­GL_SHORT, ­GL_INT, ­GL_FLOAT, and ­GL_DOUBLE are accepted. The initial value is ­GL_FLOAT. stride  Specifies the byte offset between consecutive color indexes. If stride is 0 (the initial value), the color indexes are understood to be tightly packed in the array. The initial value is 0. ptr  Specifies a pointer to the first index in the array. The initial value is 0.
DESCRIPTION­glIndexPointer specifies the location and data of an array of color indexes to use when rendering. type specifies the data type of each color index and stride gives the byte stride from one color index to the next allowing vertices and attributes to be packed into a single array or stored in separate arrays. (Single-array storage may be more efficient on some implementations; see ­glInterleavedArrays.) type, stride, and ptr are saved as client-side state. The color index array is initially disabled. To enable and disable the array, call ­glEnableClientState and ­glDisableClientState with the argument ­GL_INDEX_ARRAY. If enabled, the color index array is used when ­glDrawArrays, ­glDrawElements or ­glArrayElement is called. Use ­glDrawArrays to construct a sequence of primitives (all of the same type) from prespecified vertex and vertex attribute arrays. Use ­glArrayElement to specify primitives by indexing vertices and vertex attributes and ­glDrawElements to construct a sequence of primitives by indexing vertices and vertex attributes.
NOTES­glIndexPointer is available only if the GL version is 1.1 or greater. The color index array is initially disabled, and it isn't accessed when ­glArrayElement, ­glDrawElements, or ­glDrawArrays is called. Execution of ­glIndexPointer is not allowed between ­glBegin and the corresponding ­glEnd, but an error may or may not be generated. If an error is not generated, the operation is undefined. ­glIndexPointer is typically implemented on the client side. Since the color index array parameters are client-side state, they are not saved or restored by ­glPushAttrib and ­glPopAttrib. Use ­glPushClientAttrib and ­glPopClientAttrib instead.
ERRORS­GL_INVALID_ENUM is generated if type is not an accepted value. ­GL_INVALID_VALUE is generated if stride is negative.
ASSOCIATED GETS­glIsEnabled with argument ­GL_INDEX_ARRAY
­glGet with argument ­GL_INDEX_ARRAY_TYPE
­glGet with argument ­GL_INDEX_ARRAY_STRIDE
­glGetPointerv with argument ­GL_INDEX_ARRAY_POINTER
SEE ALSO­glArrayElement(3G), ­glColorPointer(3G), ­glDrawArrays(3G), ­glDrawElements(3G), ­glEdgeFlagPointer(3G), ­glEnable(3G), ­glGetPointerv(3G), ­glInterleavedArrays(3G), ­glNormalPointer(3G), ­glPopClientAttrib(3G), ­glPushClientAttrib(3G), ­glTexCoordPointer(3G), ­glVertexPointer(3G) 0
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