glDrawRangeElements(3gl)

1GLDRAWRANGEELEMENTS(3G)                                GLDRAWRANGEELEMENTS(3G)
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NAME

6       glDrawRangeElements - render primitives from array data
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C SPECIFICATION

10       void glDrawRangeElements( GLenum mode,
11                                 GLuint start,
12                                 GLuint end,
13                                 GLsizei count,
14                                 GLenum type,
15                                 const GLvoid *indices )
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PARAMETERS

19       mode     Specifies  what  kind  of primitives to render.  Symbolic con‐
20                stants  GL_POINTS,  GL_LINE_STRIP,   GL_LINE_LOOP,   GL_LINES,
21                GL_TRIANGLE_STRIP,        GL_TRIANGLE_FAN,       GL_TRIANGLES,
22                GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON are accepted.
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24       start    Specifies the minimum array index contained in indices.
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26       end      Specifies the maximum array index contained in indices.
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28       count    Specifies the number of elements to be rendered.
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30       type     Specifies the type of the values in  count.  Must  be  one  of
31                GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.
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33       indices  Specifies  a  pointer  to  the  location where the indices are
34                stored.
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DESCRIPTION

37       glDrawRangeElements is  a  restricted  form  of  glDrawElements.  mode,
38       start,   end,   and   count   match   the  corresponding  arguments  to
39       glDrawElements, with the additional constraint that all values  in  the
40       arrays count must lie between start and end, inclusive.
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42       Implementations denote recommended maximum amounts of vertex and
43       index  data,  which  may  be  queried  by  calling  glGet with argument
44       GL_MAX_ELEMENTS_VERTICES and GL_MAX_ELEMENTS_INDICES.   If  end−start+1
45       is  greater  than the value of GL_MAX_ELEMENTS_VERTICES, or if count is
46       greater than the value of GL_MAX_ELEMENTS_INDICES, then  the  call  may
47       operate  at reduced performance.  There is no requirement that all ver‐
48       tices in the range [start, end] be referenced.  However, the  implemen‐
49       tation may partially process unused vertices, reducing performance from
50       what could be achieved with an optimal index set.
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52       When glDrawRangeElements is called, it uses start  sequential  elements
53       from  an  enabled  array,  starting at count to construct a sequence of
54       geometric primitives. mode specifies what kind of primitives  are  con‐
55       structed,  and  how  the  array elements construct these primitives. If
56       more than one array is enabled, each is used. If GL_VERTEX_ARRAY is not
57       enabled, no geometric primitives are constructed.
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59       Vertex  attributes  that  are  modified  by glDrawRangeElements have an
60       unspecified value after glDrawRangeElements returns.  For  example,  if
61       GL_COLOR_ARRAY  is enabled, the value of the current color is undefined
62       after glDrawRangeElements executes.  Attributes  that  aren't  modified
63       maintain their previous values.
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NOTES

66       glDrawRangeElements  is  available  only  if  the  GL version is 1.2 or
67       greater.
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69       glDrawRangeElements    is    included    in    display    lists.     If
70       glDrawRangeElements is entered into a display list, the necessary array
71       data (determined by the array pointers and  enables)  is  also  entered
72       into  the  display  list.  Because  the  array pointers and enables are
73       client-side state, their values affect display lists when the lists are
74       created, not when the lists are executed.
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ERRORS

77       It  is  an error for indices to lie outside the range [start, end], but
78       implementations may not check for this situation.  Such  indices  cause
79       implementation-dependent behavior.
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81       GL_INVALID_ENUM is generated if mode is not an accepted value.
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83       GL_INVALID_VALUE is generated if count is negative.
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85       GL_INVALID_VALUE is generated if end < start.
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87       GL_INVALID_OPERATION  is  generated  if glDrawRangeElements is executed
88       between the execution of glBegin and the corresponding glEnd.
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ASSOCIATED GETS

91       glGet with argument GL_MAX_ELEMENTS_VERTICES
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93       glGet with argument GL_MAX_ELEMENTS_INDICES
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