glDrawArrays: render primitives from array data.
C Specification |
glDrawArrays specifies multiple geometric primitives with very few
subroutine calls. Instead of calling a GL procedure to pass each individual
vertex, normal, texture coordinate, edge flag, or color, you can prespecify
separate arrays of vertexes, normals, and colors and use them to construct a
sequence of primitives with a single call to glDrawArrays.
- Specifies what kind of primitives to render. Symbolic constants
GL_QUADS, and GL_POLYGON are accepted.
- Specifies the starting index in the enabled arrays.
- Specifies the number of indices to be rendered.
When glDrawArrays is called, it uses count sequential
elements from each enabled array to construct a sequence of geometric
primitives, beginning with element first. mode
specifies what kind of primitives are constructed, and how the array elements
construct those primitives. If GL_VERTEX_ARRAY is not enabled,
no geometric primitives are generated.
Vertex attributes that are modified by glDrawArrays have an
unspecified value after glDrawArrays returns. For example, if
GL_COLOR_ARRAY is enabled, the value of the current color is
undefined after glDrawArrays executes. Attributes that aren't
modified remain well defined.
glDrawArrays is available only if the GL version is 1.1 or greater.
glDrawArrays is included in display lists. If glDrawArrays
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
- GL_INVALID_OPERATION is generated if glDrawArrays is executed between the
execution of glBegin and the