These were present to implement actor freezing in software rendering mode
in the way original engine was intended for performance reason.
In residualvm, software rendering will generalise the principle through
dirty-rectangles management, so off-screen buffers should not be needed.
Also, properly implementing them requires invasive changes (move previous
draw call list from global OpenGL context to individual off-screen buffers,
along with associated linear vertex allocator, adding a new draw call to
track requested buffer changes until final on-screen frame buffer
presentation).
So instead of such added complexity, lie to lua API about actor not being
in set but keep it in so it is part of normal redraw sequence.
Fixes disappearing actors in cn, bi.
Likely also fixes at, ly, sh, mn, dd which uses free/thaw lua API, but
which I did not check.
- instead of re-calculating the color values when dimming the screen,
better draw a half-transparent plane after drawing all non-overworld
characters
- fixes the issue that overworld actors were dimmed and that the
pause screen is transparent when the inventory is open
- all actors of the Overworld should cover any non-Overworld drawings
- Overworld actors need to use the depth buffer so that e.g. the
pause screen is drawn above the inventory
- this fixes issue #927 (inventory is drawn above background of pause
or menu screen)
This adds math classes for doing frustum culling in software. These could be used for optimizing performance in many other places as well. For example, if an actor is outside the view frustum, it may not be necessary to do expensive keyframe animation and vertex skinning calculations for that actor.
Previously, we split the background layers into everything
before SO 15 and after, and drew like that. However, this caused
the pink ship in shi.setb to not be drawn.
This patch draws the layers of the background at intervals of ten.
So if a set has six layers, layer 5 is the background and 4,3,2,1,0
are rendered at sortorder 40,30,20,10,0.
The clean buffer code needs two layers. Every actor needs its buffer,
but we also need a global one. The actors' buffers blit to the global buffer
which then gets blitted to screen.
Paweł Kołodziejski
Eugene Sandulenko
Cameron Cawley
Pawel Kolodziejski
Vincent Pelletier
Bastien Bouclet
Christian Krause
Joseph Jezak
Stefano Musumeci
Joni Vähämäki
Joel Teichroeb
sietschie
Dries Harnie
Einar Johan Trøan Sømåen
Giulio Camuffo
Paweł Kołodziejski