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glDrawArraysSethp

Chapter 4

115

glDrawArraysSethp

glDrawArraySethp: render multiple primitives from array data.

C Speciﬁcation

void glDrawArraySethp(

GLenum mode,

const GLint* list,

GLsizei count)

Parameters

mode Speciﬁes what kind of primitives to render. Symbolic constants

GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES,

GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES,

GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON are accepted.

list Points to an array of starting indices in the enabled arrays.

count Speciﬁes the number of groups of primitives to be rendered.

Description

glDrawArraySethp speciﬁes multiple geometric primitives of the same type with a

single subroutine call. Instead of calling a GL procedure to pass each individual vertex,

normal, texture coordinate, edge ﬂag, or color, you can use the vertex array calls to

pre-specify arrays of vertices, normals, and colors and use them to construct a sequence

of primitives with a single call to glDrawArraySethp.

When glDrawArraySethp is called, it iterates over count+1 array indices from the list.

For 0 ≥ i<count, glDrawArraySethp uses list[i+1] - list[i] sequential elements from each

enabled array to construct a sequence of geometric primitives, beginning with element

list[i]. mode speciﬁes what kind of primitives are constructed, and how the array

elements construct those primitives. If GL_VERTEX_ARRAY is not enabled, no

geometric primitives are generated.

Vertex attributes that are modiﬁed by glDrawArraySethp have an unspeciﬁed value

after glDrawArraySethp returns. For example, if GL_C4UB_V3F is enabled, the value of

the current color is undeﬁned after glDrawArraySethp executes. Attributes that aren’t

modiﬁed remain well deﬁned.

glDrawArraySethp(mode, list, count) is functionally equivalent to:

for (i = 0; i < count; i++)

glDrawArrays(mode, list[i], list[i+1] - list[i]);

The behavior is undeﬁned if list[i+1] is less than list[i] for any i in the range i ≥ 0 and

i<count.

Notes

glDrawArraySethp is a Hewlett-Packard GL version 1.1 extension.

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