glDrawArrays — render primitives from array data
void glDrawArrays( | GLenum mode, |
GLint first, | |
GLsizei count) ; |
mode
Specifies what kind of primitives to render.
Symbolic constants
GL_POINTS
,
GL_LINE_STRIP
,
GL_LINE_LOOP
,
GL_LINES
,
GL_LINE_STRIP_ADJACENCY
,
GL_LINES_ADJACENCY
,
GL_TRIANGLE_STRIP
,
GL_TRIANGLE_FAN
,
GL_TRIANGLES
,
GL_TRIANGLE_STRIP_ADJACENCY
,
GL_TRIANGLES_ADJACENCY
and GL_PATCHES
are accepted.
first
Specifies the starting index in the enabled arrays.
count
Specifies the number of indices to be rendered.
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.
Vertex attributes that are modified by glDrawArrays
have an
unspecified value after glDrawArrays
returns. Attributes that aren't
modified remain well defined.
GL_LINE_STRIP_ADJACENCY
,
GL_LINES_ADJACENCY
,
GL_TRIANGLE_STRIP_ADJACENCY
and
GL_TRIANGLES_ADJACENCY
are available only if the GL version is 3.2 or greater.
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 a non-zero buffer object name is bound to an
enabled array and the buffer object's data store is currently mapped.
GL_INVALID_OPERATION
is generated if a geometry shader is active and mode
is incompatible with the input primitive type of the geometry shader in the currently installed program object.
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