Implement wide side-by-side mode, using adjusted aspect ratio in projection matrix.

Use optimal framebuffer size for side-by-side modes.

src/gl/renderer/gl_renderer.cpp

@@ -57,6 +57,7 @@
 #include "gl/shaders/gl_colormapshader.h"
 #include "gl/shaders/gl_lensshader.h"
 #include "gl/shaders/gl_presentshader.h"
+#include "gl/stereo3d/gl_stereo3d.h"
 #include "gl/textures/gl_texture.h"
 #include "gl/textures/gl_translate.h"
 #include "gl/textures/gl_material.h"
@@ -273,6 +274,8 @@ void FGLRenderer::SetOutputViewport(GL_IRECT *bounds)
 			mSceneViewport.top += mOutputLetterbox.top;
 		}
 	}
+
+	s3d::Stereo3DMode::getCurrentMode().AdjustViewports();
 }
 
 //===========================================================================

src/gl/scene/gl_scene.cpp

@@ -801,7 +801,6 @@ sector_t * FGLRenderer::RenderViewpoint (AActor * camera, GL_IRECT * bounds, flo
 	{
 		const s3d::EyePose * eye = stereo3dMode.getEyePose(eye_ix);
 		eye->SetUp();
-		// TODO: stereo specific viewport - needed when implementing side-by-side modes etc.
 		SetOutputViewport(bounds);
 		Set3DViewport(mainview);
 		mDrawingScene2D = true;

src/gl/stereo3d/gl_sidebyside3d.cpp

@@ -39,6 +39,36 @@
 
 namespace s3d {
 
+void SideBySideBase::Present() const
+{
+	GLRenderer->mBuffers->BindOutputFB();
+	GLRenderer->ClearBorders();
+
+	// Compute screen regions to use for left and right eye views
+	int leftWidth = GLRenderer->mOutputLetterbox.width / 2;
+	int rightWidth = GLRenderer->mOutputLetterbox.width - leftWidth;
+	GL_IRECT leftHalfScreen = GLRenderer->mOutputLetterbox;
+	leftHalfScreen.width = leftWidth;
+	GL_IRECT rightHalfScreen = GLRenderer->mOutputLetterbox;
+	rightHalfScreen.width = rightWidth;
+	rightHalfScreen.left += leftWidth;
+
+	GLRenderer->mBuffers->BindEyeTexture(0, 0);
+	GLRenderer->DrawPresentTexture(leftHalfScreen, true);
+
+	GLRenderer->mBuffers->BindEyeTexture(1, 0);
+	GLRenderer->DrawPresentTexture(rightHalfScreen, true);
+}
+
+// AdjustViewports() is called from within FLGRenderer::SetOutputViewport(...)
+void SideBySideBase::AdjustViewports() const
+{
+	// Change size of renderbuffer, and align to screen
+	GLRenderer->mSceneViewport.width /= 2;
+	GLRenderer->mSceneViewport.left /= 2;
+	GLRenderer->mScreenViewport.width /= 2;
+	GLRenderer->mScreenViewport.left /= 2;
+}
 
 /* static */
 const SideBySideSquished& SideBySideSquished::getInstance(float ipd)
@@ -54,26 +84,18 @@ SideBySideSquished::SideBySideSquished(double ipdMeters)
 	eye_ptrs.Push(&rightEye);
 }
 
-void SideBySideSquished::Present() const
+/* static */
+const SideBySideFull& SideBySideFull::getInstance(float ipd)
 {
-	GLRenderer->mBuffers->BindOutputFB();
-	GLRenderer->ClearBorders();
-
-	// Compute screen regions to use for left and right eye views
-	int leftWidth = GLRenderer->mOutputLetterbox.width/2;
-	int rightWidth = GLRenderer->mOutputLetterbox.width - leftWidth;
-	GL_IRECT leftHalfScreen = GLRenderer->mOutputLetterbox;
-	leftHalfScreen.width = leftWidth;
-	GL_IRECT rightHalfScreen = GLRenderer->mOutputLetterbox;
-	rightHalfScreen.width = rightWidth;
-	rightHalfScreen.left += leftWidth;
-
-	GLRenderer->mBuffers->BindEyeTexture(0, 0);
-	GLRenderer->DrawPresentTexture(leftHalfScreen, true);
-
-	GLRenderer->mBuffers->BindEyeTexture(1, 0);
-	GLRenderer->DrawPresentTexture(rightHalfScreen, true);
+	static SideBySideFull instance(ipd);
+	return instance;
 }
 
+SideBySideFull::SideBySideFull(double ipdMeters)
+	: leftEye(ipdMeters), rightEye(ipdMeters)
+{
+	eye_ptrs.Push(&leftEye);
+	eye_ptrs.Push(&rightEye);
+}
 
 } /* namespace s3d */

src/gl/stereo3d/gl_sidebyside3d.h

@@ -44,18 +44,49 @@
 
 namespace s3d {
 
-class SideBySideSquished : public Stereo3DMode
+class SideBySideBase : public Stereo3DMode
+{
+public:
+	void Present() const override;
+	virtual void AdjustViewports() const override;
+};
+
+class SideBySideSquished : public SideBySideBase
 {
 public:
 	static const SideBySideSquished& getInstance(float ipd);
-
 	SideBySideSquished(double ipdMeters);
-	void Present() const override;
 private:
 	LeftEyePose leftEye;
 	RightEyePose rightEye;
 };
 
+class SBSFLeftEyePose : public LeftEyePose {
+public:
+	SBSFLeftEyePose(double ipdMeters) : LeftEyePose(ipdMeters) {}
+	virtual VSMatrix GetProjection(float fov, float aspectRatio, float fovRatio) const override {
+		return LeftEyePose::GetProjection(fov, 0.5f * aspectRatio, fovRatio);
+	}
+};
+
+class SBSFRightEyePose : public RightEyePose {
+public:
+	SBSFRightEyePose(double ipdMeters) : RightEyePose(ipdMeters) {}
+	virtual VSMatrix GetProjection(float fov, float aspectRatio, float fovRatio) const override {
+		return RightEyePose::GetProjection(fov, 0.5f * aspectRatio, fovRatio);
+	}
+};
+
+class SideBySideFull : public SideBySideBase
+{
+public:
+	static const SideBySideFull& getInstance(float ipd);
+	SideBySideFull(double ipdMeters);
+private:
+	SBSFLeftEyePose leftEye;
+	SBSFRightEyePose rightEye;
+};
+
 
 } /* namespace s3d */
 

src/gl/stereo3d/gl_stereo3d.h

@@ -31,6 +31,7 @@
 #include <cstring> // needed for memcpy on linux, which is needed by VSMatrix copy ctor
 #include "tarray.h"
 #include "gl/data/gl_matrix.h"
+#include "gl/renderer/gl_renderer.h"
 
 
 /* stereoscopic 3D API */
@@ -78,6 +79,7 @@ public:
 	virtual void TearDown() const {};
 
 	virtual bool IsMono() const { return false; }
+	virtual void AdjustViewports() const {};
 	virtual void Present() const = 0;
 
 protected:

src/gl/stereo3d/gl_stereo_cvars.cpp

@@ -72,7 +72,9 @@ const Stereo3DMode& Stereo3DMode::getCurrentMode()
 	case 2:
 		setCurrentMode(RedCyan::getInstance(vr_ipd));
 		break;
-	// TODO: missing index 3 for not-yet-implemented side-by-side mode, to match values from GZ3Doom
+	case 3:
+		setCurrentMode(SideBySideFull::getInstance(vr_ipd));
+		break;
 	case 4:
 		setCurrentMode(SideBySideSquished::getInstance(vr_ipd));
 		break;
@@ -93,7 +95,9 @@ const Stereo3DMode& Stereo3DMode::getCurrentMode()
 	// TODO: 8: Oculus Rift
 	case 9:
 		setCurrentMode(AmberBlue::getInstance(vr_ipd));
-		break;	case 0:
+		break;	
+	// TODO: 10: HTC Vive/OpenVR
+	case 0:
 	default:
 		setCurrentMode(MonoView::getInstance());
 		break;

wadsrc/static/language.enu

@@ -2701,6 +2701,7 @@ OPTVAL_REDCYAN 				= "Red/Cyan";
 OPTVAL_AMBERBLUE 			= "Amber/Blue";
 OPTVAL_LEFTEYE 				= "Left Eye";
 OPTVAL_RIGHTEYE 			= "Right Eye";
+OPTVAL_SBSFULL		    	= "Side-by-side Full";
 OPTVAL_SBSNARROW			= "Side-by-side Narrow";
 OPTVAL_QUADBUFFERED 		= "Quad-buffered";
 OPTVAL_UNCHARTED2			= "Uncharted 2";

wadsrc/static/menudef.z

@@ -167,6 +167,7 @@ OptionValue VRMode
 	1, "$OPTVAL_GREENMAGENTA"
 	2, "$OPTVAL_REDCYAN"
 	9, "$OPTVAL_AMBERBLUE"
+	3, "$OPTVAL_SBSFULL"
 	4, "$OPTVAL_SBSNARROW"
 	5, "$OPTVAL_LEFTEYE"
 	6, "$OPTVAL_RIGHTEYE"