Index for Section 3G

Alphabetical listing for G

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glDrawRangeElements(3G)
NAME
  glDrawRangeElements - render primitives from array data

SYNOPSIS
  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_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(3), glColorPointer(3), glDrawArrays(3), glDrawElements(3),
  glEdgeFlagPointer(3), glGetPointerv(3), glIndexPointer(3),
  glInterleavedArrays(3), glNormalPointer(3), glTexCoordPointer(3),
  glVertexPointer(3)

Index for Section 3G

Alphabetical listing for G

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