Method GL.glNormalPointer()

Method glNormalPointer

void glNormalPointer(int type, int stride, System.Memory pointer)

Description

glNormalPointer specifies the location and data format of an array of normals to use when rendering. type specifies the data type of the normal coordinates and stride gives the byte stride from one normal 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; see glInterleavedArrays.) When a normal array is specified, type, stride, and pointer are saved as client-side state.

To enable and disable the normal array, call glEnableClientState and glDisableClientState with the argument GL_NORMAL_ARRAY. If enabled, the normal array is used when glDrawArrays, glDrawElements, 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 vertexes and vertex attributes and glDrawElements to construct a sequence of primitives by indexing vertexes and vertex attributes.

Parameter type

Specifies the data type of each coordinate in the array. Symbolic constants GL_BYTE, GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are accepted. The initial value is GL_FLOAT.

Parameter stride

Specifies the byte offset between consecutive normals. If stride is 0- the initial value-the normals are understood to be tightly packed in the array.

Parameter pointer

Specifies a pointer to the first coordinate of the first normal in the array.

Throws

GL_INVALID_ENUM is generated if type is not an accepted value.

GL_INVALID_VALUE is generated if stride is negative.