GLDRAWRANGEELEMENTS(3G)GLDRAWRANGEELEMENTS(3G)NAMEglDrawRangeElements - 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 con‐
stants 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.
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 count. 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.
DESCRIPTIONglDrawRangeElements 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 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 count sequential elements
from an enabled array, starting at start 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
glDrawRangeElements 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 GETS
glGet with argument GL_MAX_ELEMENTS_VERTICES
glGet with argument GL_MAX_ELEMENTS_INDICES
SEE ALSO
glArrayElement, glColorPointer, glDrawArrays, glDrawElements,
glEdgeFlagPointer, glGetPointerv, glIndexPointer, glInterleavedArrays,
glNormalPointer, glTexCoordPointer, glVertexPointer
GLDRAWRANGEELEMENTS(3G)
