glDrawRangeElements(3G)glDrawRangeElements(3G)NAMEglDrawRangeElements - render primitives from array data
SYNOPSIS
void glDrawRangeElements(
GLenum mode,
GLuint start,
GLuint end,
GLsizei count,
GLenum type,
const GLvoid *indices );
PARAMETERS
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. Specifies the minimum array index contained in indices.
Specifies the maximum array index contained in indices. Specifies the
number of elements to be rendered. Specifies the type of the values in
count. Must be one of GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or
GL_UNSIGNED_INT. Specifies a pointer to the location where the indices
are stored.
DESCRIPTIONglDrawRangeElements() is a restricted form of glDrawElements(). mode,
start, end, and count match the corresponding arguments to glDrawEle‐
ments(), 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_ELE‐
MENTS_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 ver‐
tices in the range [start, end] be referenced. However, the implemen‐
tation may partially process unused vertices, reducing performance from
what could be achieved with an optimal index set.
When glDrawRangeElements() is called, it uses start sequential elements
from an enabled array, starting at count to construct a sequence of
geometric primitives. mode specifies what kind of primitives are con‐
structed, and how the array elements construct these primitives. If
more than one array is enabled, each is used. If GL_VERTEX_ARRAY is not
enabled, no geometric primitives are constructed.
Vertex attributes that are modified by glDrawRangeElements() have an
unspecified value after glDrawRangeElements() returns. For example, if
GL_COLOR_ARRAY is enabled, the value of the current color is undefined
after glDrawRangeElements() executes. Attributes that aren't modified
maintain their previous values.
NOTESglDrawRangeElements() is available only if the GL version is 1.2 or
greater.
glDrawRangeElements() is included in display lists. If glDrawRangeEle‐
ments() is entered into a display list, the necessary array data
(determined by the array pointers and enables) is also entered into the
display list. Because the array pointers and enables are client-side
state, their values affect display lists when the lists are created,
not when the lists are executed.
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 glDrawRangeElements() is executed
between the execution of glBegin() and the corresponding glEnd().
ASSOCIATED GETSglGet() with argument GL_MAX_ELEMENTS_VERTICES
glGet() with argument GL_MAX_ELEMENTS_INDICES
SEE ALSOglArrayElement(3), glColorPointer(3), glDrawArrays(3), glDrawEle‐
ments(3), glEdgeFlagPointer(3), glGetPointerv(3), glIndexPointer(3),
glInterleavedArrays(3), glNormalPointer(3), glTexCoordPointer(3),
glVertexPointer(3)glDrawRangeElements(3G)