glDrawRangeElements man page on OpenBSD

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GLDRAWRANGEELEMENTS(3G)				       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 )

       delim $$

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.

       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.

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 start sequential elements
       from an enabled array, starting at count 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. 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.

NOTES
       glDrawRangeElements 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(3G), glColorPointer(3G), glDrawArrays(3G),
       glDrawElements(3G), glEdgeFlagPointer(3G), glGetPointerv(3G),
       glIndexPointer(3G), glInterleavedArrays(3G), glNormalPointer(3G),
       glTexCoordPointer(3G), glVertexPointer(3G)

								 March 1, 2011
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