Страницы справочника OS X

Эта страница руководства является частью версии 5.0 Инструментов XCode

Читать страницы руководства

GLTEXCOORDPOINTER(3G)                                                                  GLTEXCOORDPOINTER(3G)



NAME
       glTexCoordPointer - define an array of texture coordinates


C SPECIFICATION
       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.  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 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, glDrawRangeElements or glArrayElement is called.

       Use glDrawArrays to construct a sequence of primitives (all of the same type) from prespecified  ver-tex vertex
       tex  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

SEE ALSO
       glArrayElement(3G),    glClientActiveTextureARB(3G),    glColorPointer(3G),     glDrawArrays(3G),     glDrawElements(3G),
       glDrawRangeElements(3G),  glEdgeFlagPointer(3G),  glEnable(3G),  glGetPointerv(3G),  glIndexPointer(3G), glNormalPointer(3G),
       glPopClientAttrib(3G), glPushClientAttrib(3G), glTexCoord(3G), glVertexPointer(3G)




                                                                                       GLTEXCOORDPOINTER(3G)