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Add hack to make the mouse (barely) usable with geos.

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SDL_CaptureMouse() seems to be the only solution.

Signed-off-by: Andrea Odetti <mariofutire@gmail.com>
This commit is contained in:
Andrea Odetti 2021-06-04 18:48:02 +01:00
parent 8d07bb1506
commit a8057a5850
1 changed files with 37 additions and 4 deletions
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41
source/frontends/sdl/sdlframe.cpp
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@ -308,12 +308,45 @@ namespace sa2
int width, height;
SDL_GetWindowSize(myWindow.get(), &width, &height);
const bool geos = (iMaxX == 32767) && (iMaxY == 32767);
const int newX = int((double(motion.x) / double(width)) * (iMaxX - iMinX) + iMinX);
const int newY = int((double(motion.y) / double(height)) * (iMaxY - iMinY) + iMinY);
int dx, dy;
if (geos)
{
// in geos the screen in 280 * 2 mouse ticks in x and 192 in y
// everything works in relative motion
// so we do not know where the pointer is
//
// the risk is that we leave the SDL window before the guest pointer reaches the end
// and we stop receiving events
//
// we could call SDL_CaptureMouse(), but this interacts badly with ImGui
//
// so we make the guest pointer a bit faster (alpha > 1)
//
// at least the pointer moves at the right speed
// and with some gymnic, one can put it in the right place
const int dx = newX - iX;
const int dy = newY - iY;
const double sizeX = 280 * 2;
const double sizeY = 192;
const double relX = double(motion.xrel) / double(width) * sizeX;
const double relY = double(motion.yrel) / double(height) * sizeY;
const double alpha = 1.1;
dx = lround(relX * alpha);
dy = lround(relY * alpha);
}
else
{
const int sizeX = iMaxX - iMinX + 1;
const int sizeY = iMaxY - iMinY + 1;
const int newX = lround(double(motion.x) / double(width) * sizeX + iMinX);
const int newY = lround(double(motion.y) / double(height) * sizeY + iMinY);
dx = newX - iX;
dy = newY - iY;
}
int outOfBoundsX;
int outOfBoundsY;