GLTEXCOORDPOINTER

Section: Misc. Reference Manual Pages (3G)
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NAME

glTexCoordPointer - define an array of texture coordinates

C SPECIFICATION

void glTexCoordPointer( GLint size,


                          GLenum type,
                          GLsizei stride,
                          const GLvoid *ptr )

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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.
ptr: Specifies a pointer to the first coordinate of the first element in the array. The initial value is 0.

DESCRIPTION

glTexCoordPointer specifies the location and data of an array of texture coordinates to use when rendering. size specifies the number of coordinates per element, and must be 1, 2, 3, or 4. type specifies the data type of each texture coordinate and stride specifies the byte stride from one array element 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.) When a texture coordinate array is specified, size, type, stride, and ptr 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, glDrawRangeElements 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.

NOTES

glTexCoordPointer 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, glDrawRangeElements, or glDrawArrays is called.

Execution of glTexCoordPointer is not allowed between the execution of glBegin and the corresponding execution of glEnd, but an error may or may not be generated. If no error is generated, the operation is undefined.

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

The texture coordinate array parameters are client-side state and are therefore not saved or restored by glPushAttrib and glPopAttrib. Use glPushClientAttrib and glPopClientAttrib instead.

When the GL_ARB_imaging extension is supported, glTexCoordPointer updates the texture coordinate array state of the active client texture unit, specified with glClientActiveTextureARB.

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