DirectDrawRenderer=opengl - screen size changeable for final rendering?
hiho what i ever wondered but never dared to ask: i tried recently the said key with jagged alliance 2. as the game has quite a low resolution 640 or 800 it would be nice to allow higher resolutions when rendering ddraw with opengl (e.g. game wants 800 but for the final rendering use 1600). is this doable via registry or somewhere else? for the files: i run the apps in desktop-mode. -- cu
Am Dienstag 06 Februar 2007 14:13 schrieb Christoph Frick:
hiho
what i ever wondered but never dared to ask:
i tried recently the said key with jagged alliance 2. as the game has quite a low resolution 640 or 800 it would be nice to allow higher resolutions when rendering ddraw with opengl (e.g. game wants 800 but for the final rendering use 1600). is this doable via registry or somewhere else? for the files: i run the apps in desktop-mode. Do you mean if if you can use a higher resolution than the game sets? For Direct3D games this can work, but for DirectDraw it is going to fail.
Direct3D games which draw only untransformed vertices pass coordinates in the range of [-1.0 ; +1.0], which later get scaled to viewport coordinates. With a different viewport we can trick the game into doing that. It will get tricky when the app draws transformed vertices(which have screen coordinates). DirectDraw games access the screen directly by using coordinates from 0, 0 to with, height. If wine makes the surface bigger the rendering will just end up in a corner. The best thing we can do is to scale it, but that is what your monitor does if you set a lower resoltution. So you *may* be able to trick the game into using a different resolution, but this will have to be a per-game hack and can't be done in general.
On Thu, Feb 08, 2007 at 07:01:04PM +0100, Stefan Dösinger wrote:
DirectDraw games access the screen directly by using coordinates from 0, 0 to with, height. If wine makes the surface bigger the rendering will just end up in a corner. The best thing we can do is to scale it, but that is what your monitor does if you set a lower resoltution.
thats the point. i dont know how wine handles the ddraw-over-opengl scenario. i just had very blury graphics in JA2. nothing to wonder about as i assume at least one quad is drawn with the image as texture. so the filtering kicks in and voila we have bad image quality. so i wondered if i could configre somewhere to render this quad instead of 800x600 like the app wants it but with 1600x1200 i would get quite some good antialiasing for this old game. this would of course assume, that wine "fakes" the screen until a redraw, where the polygon is drawn again. if i would just change the res of the monitor there i get also some fsaa for free because the tft would scale it for me - changing the res each time is a cumbersome task for one how does not like to change res at all ;)
So you *may* be able to trick the game into using a different resolution, but this will have to be a per-game hack and can't be done in general.
assuming that my "render a quad" theory is right it would work to place a key in the registry, where i would tell the ogl-ddraw-renderer to use my res instead of the one the apps wants. -- cu
thats the point. i dont know how wine handles the ddraw-over-opengl scenario. i just had very blury graphics in JA2. nothing to wonder about as i assume at least one quad is drawn with the image as texture. so the filtering kicks in and voila we have bad image quality. No, I think opengl ddraw rendering is still pretty buggy. I wrote the code to do it mainly for Direct3D7 games which blit their HUD onto the screen using DirectDraw blitting calls. I tested it with Prince of Persia 3D, Swat 3 and Battlezone 2. I have some fixes in my patch list I'm going to send in the next days to fix some readback bugs. (Half-Life 2 uses the blitting code to make screenshots and savegame images). Furthermore partial render target locking is completely broken in git, I have fixes for that too.
assuming that my "render a quad" theory is right it would work to place a key in the registry, where i would tell the ogl-ddraw-renderer to use my res instead of the one the apps wants. OpenGL DirectDraw rendering renders by setting up the projection matrix to have 0/0 at the top left of the screen and with/height at the bottom right. Then it calculates the source coordinates with Xsrc / Source->pow2Width and Ysrc / Source->pow2Height and draws a quad.
So yes, in theory we could scale things up by just setting a higher resolution. One could get nicer graphics with linear / bilinear / anisotropic texture filtering, but there are some issues: * Color keying: Filtering will change the color values slightly, so mess up color keying * Mouse input: We'd have to do the same for received mouse events * readback: If the application locks the render target or reads it back into an offscreen texture, you have to undo filtering and scaling It will be easier to just use multisampling on the final rendering. The nvidia driver has such an option to force multisampling. But that is I think simmilar to what your tft does. Of course for properly changed resolutions you have to run in fullscreen, not virtual desktop. It would be a pretty messy thing to force a foreign resolution onto a game. You can try to do that of course, but I don't think such a patch would be accepted into wine.
participants (2)
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Christoph Frick -
Stefan Dösinger