glTexCoordPointer function

Artikkel
12/11/2020

The glTexCoordPointer function defines an array of texture coordinates.

Syntax

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

Parameters

size: The number of coordinates per array element. The value of size must be 1, 2, 3, or 4.
type: The data type of each texture coordinate in the array using the following symbolic constants: GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE.
stride: The byte offset between consecutive array elements. When stride is zero, the array elements are tightly packed in the array.
pointer: A pointer to the first coordinate of the first element in the array.

Return value

This function does not return a value.

Error codes

The following error codes can be retrieved by the glGetError function.

Name	Meaning
GL_INVALID_ENUM	type was not an accepted value.
GL_INVALID_VALUE	size was not 1, 2, 3, or 4.
GL_INVALID_VALUE	stride was negative.

Remarks

The glTexCoordPointer function specifies the location and data of an array of texture coordinates to use when rendering.The size parameter specifies the number of coordinates used for each element of the array.The type parameter specifies the data type of each texture coordinate. The stride parameter determines the byte offset from one array element to the next, enabling the packing of vertices and attributes in a single array or storage in separate arrays. In some implementations, storing the vertices and attributes in a single array can be more efficient than using separate arrays. For more information, see glInterleavedArrays. When a texture coordinate array is specified, size, type, stride, and pointer are saved client-side state.

A texture coordinate array is enabled when you specify the GL_TEXTURE_COORD_ARRAY constant with glEnableClientState. When enabled, glDrawArrays, glDrawElements, and glArrayElement use the texture coordinate array. By default the texture coordinate array is disabled.

You cannot include glTexCoordPointer in display lists.

When you specify a texture coordinate array using glTexCoordPointer, the values of all the function's texture coordinate array parameters are saved in a client-side state, and static array elements can be cached. Because the texture coordinate array parameters are client-side state, their values are not saved or restored by glPushAttrib and glPopAttrib.

Although no error is generated when you call glTexCoordPointer within glBegin and glEnd pairs, the results are undefined.

The following functions retrieve information related to glTexCoordPointer:

glIsEnabled with argument GL_TEXTURE_COORD_ARRAY

glGet with argument GL_TEXTURE_COORD_ARRAY_SIZE

glGet with argument GL_TEXTURE_COORD_ARRAY_STRIDE

glGet with argument GL_TEXTURE_COORD_ARRAY_COUNT

glGet with argument GL_TEXTURE_COORD_ARRAY_TYPE

glGetPointerv with argument GL_TEXTURE_COORD_ARRAY_POINTER

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Gl.h
Library	Opengl32.lib
DLL	Opengl32.dll

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