glDrawArrays(3G) OpenGL Reference glDrawArrays(3G)NAME
glDrawArrays - render primitives from array data
C SPECIFICATION
void glDrawArrays( GLenum mode,
GLint first,
GLsizei count )
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.
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glDrawArrays(3G) OpenGL Reference glDrawArrays(3G)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 ALSO
glArrayElement, glColorPointer, glDrawElements, glDrawRangeElements,
glEdgeFlagPointer, glGetPointerv, glIndexPointer, glInterleavedArrays,
glNormalPointer, glTexCoordPointer, glVertexPointer
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