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https://github.com/ZDoom/qzdoom.git
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296 lines
9 KiB
C++
296 lines
9 KiB
C++
/*
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** Polygon Doom software renderer
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** Copyright (c) 2016 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#include <stdlib.h>
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#include "templates.h"
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#include "doomdef.h"
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#include "p_maputl.h"
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#include "sbar.h"
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#include "r_data/r_translate.h"
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#include "r_poly_portal.h"
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#include "r_poly.h"
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#include "gl/data/gl_data.h"
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extern bool r_showviewer;
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/////////////////////////////////////////////////////////////////////////////
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PolyDrawSectorPortal::PolyDrawSectorPortal(FSectorPortal *portal, bool ceiling) : Portal(portal), Ceiling(ceiling)
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{
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StencilValue = PolyRenderer::Instance()->GetNextStencilValue();
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}
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void PolyDrawSectorPortal::Render(int portalDepth)
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{
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if (Portal->mType == PORTS_HORIZON || Portal->mType == PORTS_PLANE)
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return;
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SaveGlobals();
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// To do: get this information from PolyRenderer instead of duplicating the code..
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double radPitch = ViewPitch.Normalized180().Radians();
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double angx = cos(radPitch);
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double angy = sin(radPitch) * glset.pixelstretch;
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double alen = sqrt(angx*angx + angy*angy);
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float adjustedPitch = (float)asin(angy / alen);
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float adjustedViewAngle = (float)(ViewAngle - 90).Radians();
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float ratio = WidescreenRatio;
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float fovratio = (WidescreenRatio >= 1.3f) ? 1.333333f : ratio;
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float fovy = (float)(2 * DAngle::ToDegrees(atan(tan(FieldOfView.Radians() / 2) / fovratio)).Degrees);
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TriMatrix worldToView =
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TriMatrix::rotate(adjustedPitch, 1.0f, 0.0f, 0.0f) *
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TriMatrix::rotate(adjustedViewAngle, 0.0f, -1.0f, 0.0f) *
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TriMatrix::scale(1.0f, glset.pixelstretch, 1.0f) *
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TriMatrix::swapYZ() *
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TriMatrix::translate((float)-ViewPos.X, (float)-ViewPos.Y, (float)-ViewPos.Z);
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TriMatrix worldToClip = TriMatrix::perspective(fovy, ratio, 5.0f, 65535.0f) * worldToView;
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RenderPortal.SetViewpoint(worldToClip, PortalPlane, StencilValue);
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RenderPortal.SetPortalSegments(Segments);
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RenderPortal.Render(portalDepth);
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RestoreGlobals();
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}
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void PolyDrawSectorPortal::RenderTranslucent(int portalDepth)
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{
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if (Portal->mType == PORTS_HORIZON || Portal->mType == PORTS_PLANE)
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return;
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SaveGlobals();
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RenderPortal.RenderTranslucent(portalDepth);
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RestoreGlobals();
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}
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void PolyDrawSectorPortal::SaveGlobals()
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{
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savedextralight = extralight;
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savedpos = ViewPos;
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savedangle = ViewAngle;
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savedvisibility = swrenderer::R_GetVisibility();
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savedcamera = camera;
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savedsector = viewsector;
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if (Portal->mType == PORTS_SKYVIEWPOINT)
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{
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// Don't let gun flashes brighten the sky box
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ASkyViewpoint *sky = barrier_cast<ASkyViewpoint*>(Portal->mSkybox);
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extralight = 0;
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swrenderer::R_SetVisibility(sky->args[0] * 0.25f);
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ViewPos = sky->InterpolatedPosition(r_TicFracF);
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ViewAngle = savedangle + (sky->PrevAngles.Yaw + deltaangle(sky->PrevAngles.Yaw, sky->Angles.Yaw) * r_TicFracF);
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}
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else //if (Portal->mType == PORTS_STACKEDSECTORTHING || Portal->mType == PORTS_PORTAL || Portal->mType == PORTS_LINKEDPORTAL)
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{
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//extralight = pl->extralight;
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//swrenderer::R_SetVisibility(pl->visibility);
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ViewPos.X += Portal->mDisplacement.X;
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ViewPos.Y += Portal->mDisplacement.Y;
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}
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camera = nullptr;
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viewsector = Portal->mDestination;
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R_SetViewAngle();
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Portal->mFlags |= PORTSF_INSKYBOX;
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if (Portal->mPartner > 0) sectorPortals[Portal->mPartner].mFlags |= PORTSF_INSKYBOX;
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}
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void PolyDrawSectorPortal::RestoreGlobals()
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{
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Portal->mFlags &= ~PORTSF_INSKYBOX;
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if (Portal->mPartner > 0) sectorPortals[Portal->mPartner].mFlags &= ~PORTSF_INSKYBOX;
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camera = savedcamera;
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viewsector = savedsector;
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ViewPos = savedpos;
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swrenderer::R_SetVisibility(savedvisibility);
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extralight = savedextralight;
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ViewAngle = savedangle;
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R_SetViewAngle();
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}
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/////////////////////////////////////////////////////////////////////////////
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PolyDrawLinePortal::PolyDrawLinePortal(FLinePortal *portal) : Portal(portal)
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{
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StencilValue = PolyRenderer::Instance()->GetNextStencilValue();
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}
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PolyDrawLinePortal::PolyDrawLinePortal(line_t *mirror) : Mirror(mirror)
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{
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StencilValue = PolyRenderer::Instance()->GetNextStencilValue();
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}
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void PolyDrawLinePortal::Render(int portalDepth)
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{
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SaveGlobals();
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// To do: get this information from PolyRenderer instead of duplicating the code..
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double radPitch = ViewPitch.Normalized180().Radians();
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double angx = cos(radPitch);
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double angy = sin(radPitch) * glset.pixelstretch;
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double alen = sqrt(angx*angx + angy*angy);
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float adjustedPitch = (float)asin(angy / alen);
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float adjustedViewAngle = (float)(ViewAngle - 90).Radians();
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float ratio = WidescreenRatio;
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float fovratio = (WidescreenRatio >= 1.3f) ? 1.333333f : ratio;
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float fovy = (float)(2 * DAngle::ToDegrees(atan(tan(FieldOfView.Radians() / 2) / fovratio)).Degrees);
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TriMatrix worldToView =
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TriMatrix::rotate(adjustedPitch, 1.0f, 0.0f, 0.0f) *
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TriMatrix::rotate(adjustedViewAngle, 0.0f, -1.0f, 0.0f) *
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TriMatrix::scale(1.0f, glset.pixelstretch, 1.0f) *
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TriMatrix::swapYZ() *
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TriMatrix::translate((float)-ViewPos.X, (float)-ViewPos.Y, (float)-ViewPos.Z);
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if (Mirror)
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worldToView = TriMatrix::scale(-1.0f, 1.0f, 1.0f) * worldToView;
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TriMatrix worldToClip = TriMatrix::perspective(fovy, ratio, 5.0f, 65535.0f) * worldToView;
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// Calculate plane clipping
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line_t *clipLine = Portal ? Portal->mDestination : Mirror;
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DVector2 planePos = clipLine->v1->fPos();
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DVector2 planeNormal = (clipLine->v2->fPos() - clipLine->v1->fPos()).Rotated90CW();
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planeNormal.MakeUnit();
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double planeD = -(planeNormal | (planePos + planeNormal * 0.001));
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Vec4f portalPlane((float)planeNormal.X, (float)planeNormal.Y, 0.0f, (float)planeD);
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RenderPortal.SetViewpoint(worldToClip, portalPlane, StencilValue);
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RenderPortal.SetPortalSegments(Segments);
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RenderPortal.Render(portalDepth);
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RestoreGlobals();
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}
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void PolyDrawLinePortal::RenderTranslucent(int portalDepth)
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{
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SaveGlobals();
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RenderPortal.RenderTranslucent(portalDepth);
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RestoreGlobals();
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}
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void PolyDrawLinePortal::SaveGlobals()
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{
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savedextralight = extralight;
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savedpos = ViewPos;
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savedangle = ViewAngle;
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savedcamera = camera;
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savedsector = viewsector;
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savedinvisibility = camera ? (camera->renderflags & RF_INVISIBLE) == RF_INVISIBLE : false;
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savedViewPath[0] = ViewPath[0];
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savedViewPath[1] = ViewPath[1];
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if (Mirror)
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{
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DAngle startang = ViewAngle;
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DVector3 startpos = ViewPos;
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vertex_t *v1 = Mirror->v1;
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// Reflect the current view behind the mirror.
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if (Mirror->Delta().X == 0)
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{ // vertical mirror
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ViewPos.X = v1->fX() - startpos.X + v1->fX();
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}
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else if (Mirror->Delta().Y == 0)
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{ // horizontal mirror
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ViewPos.Y = v1->fY() - startpos.Y + v1->fY();
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}
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else
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{ // any mirror
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vertex_t *v2 = Mirror->v2;
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double dx = v2->fX() - v1->fX();
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double dy = v2->fY() - v1->fY();
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double x1 = v1->fX();
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double y1 = v1->fY();
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double x = startpos.X;
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double y = startpos.Y;
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// the above two cases catch len == 0
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double r = ((x - x1)*dx + (y - y1)*dy) / (dx*dx + dy*dy);
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ViewPos.X = (x1 + r * dx) * 2 - x;
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ViewPos.Y = (y1 + r * dy) * 2 - y;
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}
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ViewAngle = Mirror->Delta().Angle() * 2 - startang;
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if (camera)
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camera->renderflags &= ~RF_INVISIBLE;
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}
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else
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{
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auto src = Portal->mOrigin;
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auto dst = Portal->mDestination;
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P_TranslatePortalXY(src, ViewPos.X, ViewPos.Y);
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P_TranslatePortalZ(src, ViewPos.Z);
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P_TranslatePortalAngle(src, ViewAngle);
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P_TranslatePortalXY(src, ViewPath[0].X, ViewPath[0].Y);
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P_TranslatePortalXY(src, ViewPath[1].X, ViewPath[1].Y);
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if (!r_showviewer && camera && P_PointOnLineSidePrecise(ViewPath[0], dst) != P_PointOnLineSidePrecise(ViewPath[1], dst))
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{
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double distp = (ViewPath[0] - ViewPath[1]).Length();
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if (distp > EQUAL_EPSILON)
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{
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double dist1 = (ViewPos - ViewPath[0]).Length();
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double dist2 = (ViewPos - ViewPath[1]).Length();
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if (dist1 + dist2 < distp + 1)
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{
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camera->renderflags |= RF_INVISIBLE;
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}
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}
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}
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}
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//camera = nullptr;
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//viewsector = R_PointInSubsector(ViewPos)->sector;
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R_SetViewAngle();
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if (Mirror)
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PolyTriangleDrawer::toggle_mirror();
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}
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void PolyDrawLinePortal::RestoreGlobals()
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{
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if (camera)
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{
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if (savedinvisibility)
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camera->renderflags |= RF_INVISIBLE;
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else
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camera->renderflags &= ~RF_INVISIBLE;
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}
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camera = savedcamera;
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viewsector = savedsector;
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ViewPos = savedpos;
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extralight = savedextralight;
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ViewAngle = savedangle;
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ViewPath[0] = savedViewPath[0];
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ViewPath[1] = savedViewPath[1];
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R_SetViewAngle();
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if (Mirror)
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PolyTriangleDrawer::toggle_mirror();
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}
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