glDrawRangeElements man page on Oracle
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GLDRAWRANGEELEMENTS(3G) OpenGL Manual GLDRAWRANGEELEMENTS(3G)
NAME
glDrawRangeElements - render primitives from array data
C SPECIFICATION
void glDrawRangeElements(GLenum mode, GLuint start, GLuint end,
GLsizei count, GLenum type,
const GLvoid * indices);
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.
start
Specifies the minimum array index contained in indices.
end
Specifies the maximum array index contained in indices.
count
Specifies the number of elements to be rendered.
type
Specifies the type of the values in indices. Must be one of
GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.
indices
Specifies a pointer to the location where the indices are stored.
DESCRIPTION
glDrawRangeElements is a restricted form of glDrawElements(). mode,
start, end, and count match the corresponding arguments to
glDrawElements(), with the additional constraint that all values in the
arrays count must lie between start and end, inclusive.
Implementations denote recommended maximum amounts of vertex and index
data, which may be queried by calling glGet() with argument
GL_MAX_ELEMENTS_VERTICES and GL_MAX_ELEMENTS_INDICES. If end - start +
1 is greater than the value of GL_MAX_ELEMENTS_VERTICES, or if count is
greater than the value of GL_MAX_ELEMENTS_INDICES, then the call may
operate at reduced performance. There is no requirement that all
vertices in the range start end be referenced. However, the
implementation may partially process unused vertices, reducing
performance from what could be achieved with an optimal index set.
When glDrawRangeElements is called, it uses count sequential elements
from an enabled array, starting at start to construct a sequence of
geometric primitives. mode specifies what kind of primitives are
constructed, and how the array elements construct these primitives. If
more than one array is enabled, each is used.
Vertex attributes that are modified by glDrawRangeElements have an
unspecified value after glDrawRangeElements returns. Attributes that
aren't modified maintain their previous values.
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
It is an error for indices to lie outside the range start end, but
implementations may not check for this situation. Such indices cause
implementation-dependent behavior.
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_VALUE is generated if count is negative.
GL_INVALID_VALUE is generated if end < start.
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.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to an enabled array or the element array and the buffer object's
data store is currently mapped.
ASSOCIATED GETS
glGet() with argument GL_MAX_ELEMENTS_VERTICES
glGet() with argument GL_MAX_ELEMENTS_INDICES
SEE ALSO
glDrawArrays(), glDrawElements(), glDrawElementsBaseVertex()
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/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLDRAWRANGEELEMENTS(3G)
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