I'd like to propose adding a XvMCCopySurfaceToGLXPbuffer function
to XvMC. I have implemented this in NVIDIA's binary drivers and
am able to do full framerate HDTV video textures on the higher end
GeForce4 MX cards by using glCopyTexSubImage2D to copy the Pbuffer
contents into a texture.
Status
XvMCCopySurfaceToGLXPbuffer (
Display *display,
XvMCSurface *surface,
XID pbuffer_id,
short src_x,
short src_y,
unsigned short width,
unsigned short height,
short dst_x,
short dst_y,
int flags
);
This function copies the rectangle specified by src_x, src_y, width,
and height from the XvMCSurface denoted by "surface" to offset dst_x, dst_y
within the pbuffer identified by its GLXPbuffer XID "pbuffer_id".
Note that while the src_x, src_y are in XvMC's standard left-handed
coordinate system and specify the upper left hand corner of the
rectangle, dst_x and dst_y are in OpenGL's right-handed coordinate
system and denote the lower left hand corner of the destination
rectangle in the pbuffer.
"Flags" may be XVMC_TOP_FIELD, XVMC_BOTTOM_FIELD or XVMC_FRAME_PICTURE.
If flags is not XVMC_FRAME_PICTURE, the src_y and height are in field
coordinates, not frame. That is, the total copyable height is half
the height of the XvMCSurface.
XvMCCopySurfaceToGLXPbuffer does not return until the copy to the
pbuffer has completed. XvMCCopySurfaceToGLXPbuffer is pipelined
with XvMCRenderSurface so no explicit synchronization between
XvMCRenderSurface and XvMCCopySurfaceToGLXPbuffer is needed.
The pbuffer must be of type GLX_RGBA, and the destination of the
copy is the left front buffer of the pbuffer. Success is returned
if no error occured, the error code is returned otherwise.
Possible Errors:
XvMCBadSurface - The surface is invalid.
BadDrawable - The pbuffer_id is not a valid pbuffer.
BadMatch - The pbuffer is not of type GLX_RGBA or the
pbuffer does not have a front left buffer.
XvMCCopySurfaceToGLXPbuffer is supported if the following flag:
#define XVMC_COPY_TO_PBUFFER 0x00000010
is set in the XvMCSurfaceInfo's flags field.
I'd like to bump the API version up to 1.1 and add this.
Comments?
Mark.
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