NAME¶
glDrawArrays - render primitives from array data
C SPECIFICATION¶
void
glDrawArrays(GLenum mode, GLint first,
GLsizei count);
PARAMETERS¶
mode
Specifies what kind of primitives to render.
Symbolic constants GL_POINTS, GL_LINE_STRIP,
GL_LINE_LOOP, GL_LINES, GL_LINE_STRIP_ADJACENCY,
GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN,
GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY,
GL_TRIANGLES_ADJACENCY and GL_PATCHES are accepted.
first
Specifies the starting index in the enabled
arrays.
count
Specifies the number of indices to be
rendered.
DESCRIPTION¶
glDrawArrays specifies multiple geometric primitives with very few
subroutine calls. Instead of calling a GL procedure to pass each individual
vertex, normal, texture coordinate, edge flag, or color, you can prespecify
separate arrays of vertices, normals, and colors and use them to construct a
sequence of primitives with a single call to
glDrawArrays.
When
glDrawArrays is called, it uses
count sequential elements
from each enabled array to construct a sequence of geometric primitives,
beginning with element
first.
mode specifies what kind of
primitives are constructed and how the array elements construct those
primitives.
Vertex attributes that are modified by
glDrawArrays have an unspecified
value after
glDrawArrays returns. Attributes that aren't modified
remain well defined.
NOTES¶
GL_LINE_STRIP_ADJACENCY,
GL_LINES_ADJACENCY,
GL_TRIANGLE_STRIP_ADJACENCY and
GL_TRIANGLES_ADJACENCY are
available only if the GL version is 3.2 or greater.
ERRORS¶
GL_INVALID_ENUM is generated if
mode is not an accepted value.
GL_INVALID_VALUE is generated if
count is negative.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to an enabled array and the buffer object's data store is currently
mapped.
GL_INVALID_OPERATION is generated if a geometry shader is active and
mode is incompatible with the input primitive type of the geometry
shader in the currently installed program object.
SEE ALSO¶
glDrawArraysInstanced(),
glDrawElements(),
glDrawRangeElements(),
COPYRIGHT¶
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.