Интерактивная система просмотра системных руководств (man-ов)
glDrawArrays (3)
>> glDrawArrays (3) ( Разные man: Библиотечные вызовы )
NAME
glDrawArrays
- render primitives from array data
C SPECIFICATION
void glDrawArrays(
GLenum mode,
GLint first,
GLsizei count )
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.
first
Specifies the starting index in the enabled arrays.
count
Specifies the number of indices to be rendered.
DESCRIPTION
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 vertices, normals, and colors and use them to
construct a sequence of primitives with a single
call to glDrawArrays.
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.
NOTES
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.
ERRORS
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 glDrawArrays is executed between
the execution of glBegin and the corresponding glEnd.
