glDrawArrays(3G)glDrawArrays(3G)NAMEglDrawArrays - render primitives from array data
SYNOPSIS
void glDrawArrays(
GLenum mode,
GLint first,
GLsizei count );
PARAMETERS
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. Specifies the starting index in the enabled arrays.
Specifies the number of indices to be rendered.
DESCRIPTIONglDrawArrays() specifies multiple geometric primitives with very few
subroutine calls. Instead of calling a GL procedure to pass each indi‐
vidual vertex, normal, texture coordinate, edge option, 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().
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 gener‐
ated.
Vertex attributes that are modified by glDrawArrays() have an unspeci‐
fied 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.
NOTESglDrawArrays() 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().
SEE ALSOglArrayElement(3), glColorPointer(3), glDrawElements(3),
glDrawRangeElements(3), glEdgeFlagPointer(3), glGetPointerv(3), glInd‐
exPointer(3), glInterleavedArrays(3), glNormalPointer(3), glTexCoord‐
Pointer(3), glVertexPointer
glDrawArrays(3G)