HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 233

Chapter 9 I glIndexPointer glIndexPointer glIndexPointer: define an array of color indexes. C Specification void glIndexPointer( GLenum type, GLsizei stride, const GLvoid *pointer) Parameters type array stride pointer Specifies the data type of each color index in the Symbolic constants GL_UNSIGNED_BYTE, GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are accepted. 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. 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. 233