From 63b28a1d80a7d055616978de8d9f8c1c77f8dc64 Mon Sep 17 00:00:00 2001
From: Christopher Bruns <cmbruns@rotatingpenguin.com>
Date: Sun, 2 Oct 2016 16:04:52 -0400
Subject: [PATCH] Retain stereoscopic parity after dragging window in row
interleaved 3D mode.
---
src/gl/stereo3d/gl_interleaved3d.cpp | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/src/gl/stereo3d/gl_interleaved3d.cpp b/src/gl/stereo3d/gl_interleaved3d.cpp
index 225f52819..329dec953 100644
--- a/src/gl/stereo3d/gl_interleaved3d.cpp
+++ b/src/gl/stereo3d/gl_interleaved3d.cpp
@@ -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
);