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PresentVScreen: fixed sub pixel offset.

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SDL<2.0.10 uses crude approximation.
This commit is contained in:
Muzychenko Andrey 2021-10-25 08:03:30 +03:00
parent 34cb964ea5
commit 3ec96b84ad
2 changed files with 42 additions and 11 deletions
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6
SpaceCadetPinball/pch.h
View File

@ -77,4 +77,10 @@ inline float RandFloat()
return static_cast<float>(std::rand() / static_cast<double>(RAND_MAX));
}
template <typename T> constexpr
int Sign(T val)
{
return (T(0) < val) - (val < T(0));
}
#endif //PCH_H

47
SpaceCadetPinball/render.cpp
View File

@ -563,29 +563,53 @@ void render::PresentVScreen()
}
else
{
int32_t srcSeparationX = static_cast<int32_t>(vscreen->Width * 0.625f);
SDL_Rect srcBoardRect = SDL_Rect
auto tableWidthCoef = static_cast<float>(pb::MainTable->Width) / vscreen->Width;
auto srcSeparationX = static_cast<int>(round(vscreen->Width * tableWidthCoef));
auto srcBoardRect = SDL_Rect
{
0, 0,
srcSeparationX, vscreen->Height
};
SDL_Rect srcSidebarRect = SDL_Rect
auto srcSidebarRect = SDL_Rect
{
srcSeparationX, 0,
vscreen->Width - srcSeparationX, vscreen->Height
};
int32_t dstSeparationX = static_cast<int32_t>(DestinationRect.w * 0.625f);
SDL_Rect dstBoardRect = SDL_Rect
#if SDL_VERSION_ATLEAST(2, 0, 10)
// SDL_RenderCopyF was added in 2.0.10
auto dstSeparationX = DestinationRect.w * tableWidthCoef;
auto dstBoardRect = SDL_FRect
{
DestinationRect.x + static_cast<int32_t>(offset_x * fullscrn::ScaleX), DestinationRect.y + static_cast<int32_t>(offset_y * fullscrn::ScaleY),
dstSeparationX, DestinationRect.h
DestinationRect.x + offset_x * fullscrn::ScaleX,
DestinationRect.y + offset_y * fullscrn::ScaleY,
dstSeparationX, static_cast<float>(DestinationRect.h)
};
auto dstSidebarRect = SDL_FRect
{
DestinationRect.x + dstSeparationX, static_cast<float>(DestinationRect.y),
DestinationRect.w - dstSeparationX, static_cast<float>(DestinationRect.h)
};
SDL_Rect dstSidebarRect = SDL_Rect
SDL_RenderCopyF(winmain::Renderer, vScreenTex, &srcBoardRect, &dstBoardRect);
SDL_RenderCopyF(winmain::Renderer, vScreenTex, &srcSidebarRect, &dstSidebarRect);
#else
// SDL_RenderCopy cannot express sub pixel offset.
// Vscreen shift is required for that.
auto dstSeparationX = static_cast<int>(DestinationRect.w * tableWidthCoef);
auto scaledOffX = static_cast<int>(round(offset_x * fullscrn::ScaleX));
if (offset_x != 0 && scaledOffX == 0)
scaledOffX = Sign(offset_x);
auto scaledOffY = static_cast<int>(round(offset_y * fullscrn::ScaleY));
if (offset_y != 0 && scaledOffX == 0)
scaledOffY = Sign(offset_y);
auto dstBoardRect = SDL_Rect
{
DestinationRect.x + scaledOffX, DestinationRect.y + scaledOffY,
dstSeparationX, DestinationRect.h
};
auto dstSidebarRect = SDL_Rect
{
DestinationRect.x + dstSeparationX, DestinationRect.y,
DestinationRect.w - dstSeparationX, DestinationRect.h
@ -593,5 +617,6 @@ void render::PresentVScreen()
SDL_RenderCopy(winmain::Renderer, vScreenTex, &srcBoardRect, &dstBoardRect);
SDL_RenderCopy(winmain::Renderer, vScreenTex, &srcSidebarRect, &dstSidebarRect);
#endif
}
}