Gl.DrawBuffer (gb.opengl)
Static Sub DrawBuffer ( Mode As Integer )
Specify which color buffers are to be drawn into.
Parameters
- mode
-
Specifies up to four color buffers to be drawn into.
Symbolic constants
Gl.NONE,
Gl.FRONT_LEFT,
Gl.FRONT_RIGHT,
Gl.BACK_LEFT,
Gl.BACK_RIGHT,
Gl.FRONT,
Gl.BACK,
Gl.LEFT,
Gl.RIGHT, and
Gl.FRONT_AND_BACK
are accepted.
The initial value is Gl.FRONT for single-buffered contexts,
and Gl.BACK for double-buffered contexts.
Description
When colors are written to the frame buffer,
they are written into the color buffers specified by
Gl.DrawBuffer.
The specifications are as follows:
- Gl.NONE
-
No color buffers are written.
- Gl.FRONT_LEFT
-
Only the front left color buffer is written.
- Gl.FRONT_RIGHT
-
Only the front right color buffer is written.
- Gl.BACK_LEFT
-
Only the back left color buffer is written.
- Gl.BACK_RIGHT
-
Only the back right color buffer is written.
- Gl.FRONT
-
Only the front left and front right color buffers are written.
If there is no front right color buffer,
only the front left color buffer is written.
- Gl.BACK
-
Only the back left and back right color buffers are written.
If there is no back right color buffer,
only the back left color buffer is written.
- Gl.LEFT
-
Only the front left and back left color buffers are written.
If there is no back left color buffer,
only the front left color buffer is written.
- Gl.RIGHT
-
Only the front right and back right color buffers are written.
If there is no back right color buffer,
only the front right color buffer is written.
- Gl.FRONT_AND_BACK
-
All the front and back color buffers
(front left, front right, back left, back right)
are written.
If there are no back color buffers,
only the front left and front right color buffers are written.
If there are no right color buffers,
only the front left and back left color buffers are written.
If there are no right or back color buffers,
only the front left color buffer is written.
If more than one color buffer is selected for drawing,
then blending or logical operations are computed and applied independently
for each color buffer and can produce different results in each buffer.
Monoscopic contexts include only
left
buffers, and stereoscopic contexts include both
left
and
right
buffers.
Likewise, single-buffered contexts include only
front
buffers, and double-buffered contexts include both
front
and
back
buffers.
The context is selected at GL initialization.
Errors
Gl.INVALID_ENUM is generated if
mode is not an accepted value.
Gl.INVALID_OPERATION is generated if none of the buffers indicated
by
mode exists.
Associated Gets
Gl.Get with argument Gl.DRAW_BUFFER
See also
Gl.DrawBuffers,
Gl.LogicOp,
Gl.ReadBuffer