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glDrawElements - render primitives from array data
void
glDrawElements( GLenum mode,
GLsizei count,
GLenum type,
const GLvoid *indices )
eqn not supported
- 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.
- count
- Specifies the number of elements to be rendered.
- type
- Specifies the type of the values in indices. 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.
glDrawElements specifies
multiple geometric primitives with very few subroutine calls. Instead of
calling a GL function to pass each individual vertex, normal, texture coordinate,
edge flag, or color, you can prespecify separate arrays of vertices, normals,
and so on and use them to construct a sequence of primitives with a single
call to glDrawElements.
When glDrawElements is called, it uses count sequential
elements from an enabled array, starting at indices 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 glDrawElements
have an unspecified value after glDrawElements returns. For example, if
GL_COLOR_ARRAY is enabled, the value of the current color is undefined
after glDrawElements executes. Attributes that aren't modified maintain their
previous values.
glDrawElements is available only if the GL version
is 1.1 or greater.
glDrawElements is included in display lists. If glDrawElements
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.
GL_INVALID_ENUM is generated if mode is not an accepted
value.
GL_INVALID_VALUE is generated if count is negative.
GL_INVALID_OPERATION
is generated if glDrawElements is executed between the execution of glBegin
and the corresponding glEnd.
glArrayElement(3G)
, glColorPointer(3G)
,
glDrawArrays(3G)
, glDrawRangeElements(3G)
, glEdgeFlagPointer(3G)
, glGetPointerv(3G)
,
glIndexPointer(3G)
, glInterleavedArrays(3G)
, glNormalPointer(3G)
, glTexCoordPointer(3G)
,
glVertexPointer(3G)
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