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glVertexPointer

Chapter 20

477

glVertexPointer

glVertexPointer: deﬁne an array of vertex data.

C Speciﬁcation

void glVertexPointer(

GLint size,

GLenum type,

GLsizei stride,

const GLvoid *pointer)

Parameters

size Speciﬁes the number of coordinates per vertex; must be 2, 3, or 4. The

initial value is 4.

type Speciﬁes the data type of each coordinate in the array. Symbolic

constants GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are

accepted. The initial value is GL_FLOAT.

stride Speciﬁes the byte offset between consecutive vertexes. If stride is 0, the

vertexes are understood to be tightly packed in the array. The initial

value is 0.

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

Description

glVertexPointer speciﬁes the location and data format of an array of vertex coordinates

to use when rendering. size speciﬁes the number of coordinates per vertex and type the

data type of the coordinates. stride speciﬁes the byte stride from one vertex 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 vertex array is speciﬁed, size, type, stride, and pointer are

saved as client-side state.

To enable and disable the vertex array, call glEnableClientState and

glDisableClientState with the argument GL_VERTEX_ARRAY. If enabled, the vertex

array is used when glDrawArrays, glDrawElements, or glArrayElement is called.

Use glDrawArrays to construct a sequence of primitives (all of the same type) from

pre-speciﬁed 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.

Notes

glVertexPointer is available only if the GL version is 1.1 or greater.

The vertex array is initially disabled and isn’t accessed when glArrayElement,

glDrawElements or glDrawArrays is called.

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