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- added clip planes for line portals and mirrors. This should eliminate the remaining problems with some visible geometry in front of the portal, it is also necessary to handle sprite splitting across line portals properly.

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This commit is contained in:
Christoph Oelckers 2016-04-29 12:26:57 +02:00
parent dc772a9f34
commit 70bf649364
3 changed files with 35 additions and 2 deletions
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27
src/gl/scene/gl_portal.cpp
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@ -825,7 +825,28 @@ void GLPlaneMirrorPortal::PopState()
//
//-----------------------------------------------------------------------------
void GLLinePortal::PushState()
{
FStateVec4 &v = gl_RenderState.GetClipLine();
planestack.Push(v.vec[0]);
planestack.Push(v.vec[1]);
planestack.Push(v.vec[2]);
planestack.Push(v.vec[3]);
planestack.Push(gl_RenderState.GetClipLineState());
gl_RenderState.EnableClipLine(false);
}
void GLLinePortal::PopState()
{
FStateVec4 &v = gl_RenderState.GetClipLine();
float e;
planestack.Pop(e);
planestack.Pop(v.vec[3]);
planestack.Pop(v.vec[2]);
planestack.Pop(v.vec[1]);
planestack.Pop(v.vec[0]);
gl_RenderState.EnableClipLine(e != 0);
}
int GLLinePortal::ClipSeg(seg_t *seg)
{
@ -948,7 +969,10 @@ void GLMirrorPortal::DrawContents()
angle_t a1 = linedef->v2->GetClipAngle();
clipper.SafeAddClipRange(a1,a2);
gl_RenderState.SetClipLine(linedef);
gl_RenderState.EnableClipLine(true);
GLRenderer->DrawScene();
gl_RenderState.EnableClipLine(false);
MirrorFlag--;
}
@ -1018,7 +1042,10 @@ void GLLineToLinePortal::DrawContents()
GLRenderer->SetupView(ViewPos.X, ViewPos.Y, ViewPos.Z, ViewAngle, !!(MirrorFlag&1), !!(PlaneMirrorFlag&1));
ClearClipper();
gl_RenderState.SetClipLine(glport->reference->mDestination);
gl_RenderState.EnableClipLine(true);
GLRenderer->DrawScene();
gl_RenderState.EnableClipLine(false);
RestoreMapSection();
}

2
src/gl/scene/gl_portal.h
View file

@ -225,6 +225,8 @@ struct GLLinePortal : public GLPortal
virtual int ClipSubsector(subsector_t *sub);
virtual int ClipPoint(const DVector2 &pos);
virtual bool NeedCap() { return false; }
virtual void PushState();
virtual void PopState();
};

8
wadsrc/static/shaders/glsl/main.vp
View file

@ -55,11 +55,15 @@ void main()
#endif
// clip planes used for reflective flats
if (uClipHeightDirection != 0.0)
if (uClipHeightDirection != 0.0) // clip planes used for reflective flats
{
gl_ClipDistance[0] = (worldcoord.y - uClipHeight) * uClipHeightDirection;
}
else if (uClipLine.x > -1000000.0) // and for line portals - this will never be active at the same time as the reflective planes clipping so it can use the same hardware clip plane.
{
gl_ClipDistance[0] = -( (worldcoord.z - uClipLine.y) * uClipLine.z + (uClipLine.x - worldcoord.x) * uClipLine.w ) + 1.0/32768.0; // allow a tiny bit of imprecisions for colinear linedefs.
}
// clip planes used for translucency splitting
gl_ClipDistance[1] = worldcoord.y - uClipSplit.x;