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Retain stereoscopic parity after dragging window in row interleaved 3D mode.

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This commit is contained in:
Christopher Bruns 2016-10-02 16:04:52 -04:00
parent 0240cdef18
commit 63b28a1d80
1 changed files with 11 additions and 1 deletions
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12
src/gl/stereo3d/gl_interleaved3d.cpp
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@ -42,6 +42,8 @@
EXTERN_CVAR(Float, vid_brightness)
EXTERN_CVAR(Float, vid_contrast)
EXTERN_CVAR(Bool, fullscreen)
EXTERN_CVAR(Int, win_y) // pixel position of top of display window
namespace s3d {
@ -99,8 +101,16 @@ void RowInterleaved3D::Present() const
GLRenderer->mScreenViewport.width / (float)GLRenderer->mBuffers->GetWidth(),
GLRenderer->mScreenViewport.height / (float)GLRenderer->mBuffers->GetHeight());
// Compute absolute offset from top of screen to top of current display window
// because we need screen-relative, not window-relative, scan line parity
int windowVOffset = 0;
if (! fullscreen) {
I_SaveWindowedPos(); // update win_y CVAR
windowVOffset = win_y;
}
GLRenderer->mPresent3dRowShader->VerticalPixelOffset.Set(
0 // fixme: vary with window location
windowVOffset // fixme: vary with window location
+ box.height % 2 // because we want the top pixel offset, but gl_FragCoord.y is the bottom pixel offset
);