glTexCoordPointer Subroutine

OpenGL 1.1 for AIX: Reference Manual

glTexCoordPointer Subroutine

Purpose

Defines an array of texture coordinates.

Library

OpenGL C bindings library: libGL.a

C Syntax

void glTexCoordPointer(GLint size,
                     GLenum type,
                     GLsizei stride,
                     const GLvoid *pointer)

Parameters

size	Specifies the number of coordinates per array element. Must be 1, 2, 3 or 4. The initial value is 4.
type	Specifies the data type of each texture coordinate. Symbolic constants GL_SHORT, GL_INT, GL_FLOAT, or GL_DOUBLE are accepted. The initial value is GL_FLOAT.
stride	Specifies the byte offset between consecutive array elements. If stride is 0, the array elements are understood to be tightly packed. The initial value is 0.
pointer	Specifies a pointer to the first coordinate of the first element in the array.

Description

The glTexCoordPointer subroutine specifies the location and data format of an array of texture coordinates to use when rendering. The size parameter specifies the number of coordinates per element, and must be 1, 2, 3, or 4. The type parameter specifies the data type of each texture coordinate and stride gives the byte stride from one array element 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). When a texture coordinate array is specified, size, type, stride, and pointer are saved client side state.

To enable and disable the texture coordinate array, call glEnableClientState and glDisableClientState with the argument GL_TEXTURE_COORD_ARRAY. If enabled, the texture coordinate 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 vertexes and vertex attributes and glDrawElements to construct a sequence of primitives by indexing vertexes and vertex attributes.

Notes

The glTexCoordPointer subroutine is available only if the GL version is 1.1 or greater.

The texture coordinate array is initially disabled and it won't be accessed when glArrayElement, glDrawElements or glDrawArrays is called.

Execution of glTexCoordPointer 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.

The glTexCoordPointer subroutine is typically implemented on the client side with no protocol.

Since the texture coordinate array parameters are client side state, they are not saved or restored by glPushAttrib and glPopAttrib. Use glPushClientAttrib and glPopClientAttrib instead.

The glTexCoordPointer subroutine is not included in display lists.

Errors

GL_INVALID_VALUE is generated if size is not 1, 2, 3, or 4.

GL_INVALID_ENUM is generated if type is not an accepted value.

GL_INVALID_VALUE is generated if stride is negative.

Associated Gets

glIsEnabled with argument GL_TEXTURE_COORD_ARRAY

glGet with argument GL_TEXTURE_COORD_ARRAY_SIZE

glGet with argument GL_TEXTURE_COORD_ARRAY_TYPE

glGetPointerv with argument GL_TEXTURE_COORD_ARRAY_POINTER

Related Information

The glArrayElement subroutine, glColorPointer subroutine, glDrawArrays subroutine, glDrawElements subroutine, glEdgeFlagPointer subroutine, glEnable subroutine, glGetPointerv subroutine, glIndexPointer subroutine, glPopClientAttrib subroutine, glPushClientAttrib subroutine, glTexCoord subroutine, glVertexPointer subroutine.