I
glIndexPointer
Chapter 9
233
glIndexPointer
glIndexPointer: define an array of color indexes.
C Specification
void glIndexPointer(
GLenum type,
GLsizei stride,
const GLvoid *pointer)
Parameters
type 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.
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.
pointer Specifies a pointer to the first index in the array.
Description
glIndexPointer specifies the location and data format 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 vertexes 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 pointer 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
pre-specified vertex and vertex attribute arrays. Use glArrayElement to specify
primitives by indexing vertexes and vertex attributes and glDrawElements to construct
a sequence of primitives by indexing vertexes and vertex attributes.
Notes
glIndexPointer 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.
To Next Page
Loading...
Need help?
General