Releasing the last reference to a surface interface has a significant
performance impact. Mitigating the issue by eliminating some frequent
but unnecessary QueryInterface calls.
Fixes most of the performance drop reported in issue #24.
Windowed mode presentation is changed to use a series of blits clipped to
each top level window to work around performance issues when a clipper uses
a clip list instead of a window. Otherwise DirectDraw uses StretchBlt rather
than the driver Present call even if the clip list is a single rectangle
matching the window client area.
Fixes a performance issue reported in issue #24.
Changed primary surface caps to report video memory in case the surface
was only forced into system memory by DDrawCompat.
Fixes startup issues in C&C 95 and Red Alert, reported in issue #3.
When the primary surface chain is requested to be created in system memory,
flip should be emulated (copy from back buffer to front buffer) to be
consistent with legacy DirectDraw behavior.
Fixes flashing graphical artifacts in Carmageddon (Win95 version) menus
when exiting from a race, mentioned in issue #3.
8/16 bit display mode emulation is now implemented internally instead of
relying on the builtin Windows shims, as those are sometimes unreliable
(not triggering for some games on some systems when they should).
External DirectDraw hooks (such as the DWM8And16BitMitigation shim)
are disabled to avoid interference.
Fixes issues reported in #8, #9, #15.
When the display mode changes in full screen mode, DirectDraw resets
the main window to topmost after a short delay, generating a
WM_WINDOWPOSCHANGED message. This could cause an unnecessary repainting
of the window, erasing the background even if nothing needed to be updated.
Now only the regions that change during window repositioning are redrawn.
Fixes the black flashing in Rogue Spear's menus after display mode changes,
mentioned in issue #2.
Video memory render target surfaces get an additional video memory off-screen
plain surface used for providing efficient direct memory access (locking).
All 2D operations starting with a lock are redirected to the off-screen plain
surface until the next rendering operation requires the render target surface.
The two surfaces are kept in sync via blits as needed.
Fixes performance issues in Rogue Spear menus, mentioned in issue #2.
Disabled the indication of mirrored blit support via the driver GetCaps routine
as this may be reported as supported on modern GPUs even when it's not.
Removing this indication allows the HEL (Hardware Emulation Layer) to correctly
handle all mirrored blits. It also seems to perform better than the previous
clumsy line-by-line mirroring emulation.
This change assigns a different DirectDraw repository object for each original
DirectDraw object that requires temporary surfaces, ensuring that video memory
surfaces are created on the appropriate device on a multi-GPU system.
