glTexCoordPointer
- define an array of texture coordinates
C SPECIFICATION
void glTexCoordPointer(
GLint size,
GLenum type,
GLsizei stride,
const GLvoid *ptr )
delim $$
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
