glTexCoordPointerEXT Subroutine

Purpose

Defines an array of texture coordinates.

Library

OpenGL C bindings library: libGL.a

C Syntax

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

Parameters

Description

glTexCoordPointerEXT specifies the location and data format 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 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.) count indicates the number of array elements (counting from the first) that are static. Static elements may be modified by the application, but once they are modified, the application must explicitly respecify the array before using it for any rendering. When a texture coordinate array is specified, size, type, stride, count, and pointer are saved as client-side state, and static array elements may be cached by the implementation.

The texture coordinate array is enabled and disabled using glEnable and glDisable with the argument GL_TEXTURE_COORD_ARRAY_EXT. If enabled, the texture coordinate array is used when glDrawArraysEXT or glArrayElementEXT is called.

Use glDrawArraysEXT to define a sequence of primitives (all of the same type) from pre-specified vertex and vertex attribute arrays. Use glArrayElementEXT to specify primitives by indexing vertexes and vertex attributes.

Notes

Non-static array elements are not accessed until glArrayElementEXT or glDrawArraysEXT is executed.

By default the texture coordinate array is disabled and it won't be accessed when glArrayElementEXT or glDrawArraysEXT is called.

Although, it is not an error to call glTexCoordPointerEXT between the execution of glBegin and the corresponding execution of glEnd, the results are undefined.

glTexCoordPointerEXT will typically be 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.

glTexCoordPointerEXT commands are not entered into display lists.

glTexCoordPointerEXT is part of the _extname(EXT_vertex_array) extension, not part of the core GL command set. If _extstring(EXT_vertex_array) is included in the string returned by glGetString, when called with argument GL_EXTENSIONS, extension _extname(EXT_vertex_array) is supported.

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 or count is negative

Associated Gets

glIsEnabled with argument GL_TEXTURE_COORD_ARRAY_EXT

glGet with argument GL_TEXTURE_COORD_ARRAY_SIZE_EXT

glGet with argument GL_TEXTURE_COORD_ARRAY_TYPE_EXT

glGet with argument GL_TEXTURE_COORD_ARRAY_STRIDE_EXT

glGet with argument GL_TEXTURE_COORD_ARRAY_COUNT_EXT

glGetPointervEXT with argument GL_TEXTURE_COORD_ARRAY_POINTER_EXT

File

Related Information

The glArrayElementEXT subroutine, glColorPointerEXT subroutine, glDrawArraysEXT subroutine, glEdgeFlagPointerEXT subroutine, glGetPointervEXT subroutine, glIndexPointerEXT subroutine, glNormalPointerEXT subroutine, glVertexPointerEXT subroutine.