Disable HW stereo for IrrLicht 1.9 (not supported anymore)

src/client/render/factory.cpp

@@ -35,8 +35,10 @@ RenderingCore *createRenderingCore(const std::string &stereo_mode, IrrlichtDevic
 		return new RenderingCoreAnaglyph(device, client, hud);
 	if (stereo_mode == "interlaced")
 		return new RenderingCoreInterlaced(device, client, hud);
+#ifdef STEREO_PAGEFLIP_SUPPORTED
 	if (stereo_mode == "pageflip")
 		return new RenderingCorePageflip(device, client, hud);
+#endif
 	if (stereo_mode == "sidebyside")
 		return new RenderingCoreSideBySide(device, client, hud);
 	if (stereo_mode == "topbottom")

src/client/render/pageflip.cpp

@@ -20,6 +20,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "pageflip.h"
 
+#ifdef STEREO_PAGEFLIP_SUPPORTED
+
 void RenderingCorePageflip::initTextures()
 {
 	hud = driver->addRenderTargetTexture(
@@ -53,3 +55,5 @@ void RenderingCorePageflip::resetEye()
 	driver->setRenderTarget(video::ERT_FRAME_BUFFER, false, false, skycolor);
 	RenderingCoreStereo::resetEye();
 }
+
+#endif // STEREO_PAGEFLIP_SUPPORTED

src/client/render/pageflip.h

@@ -21,6 +21,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #pragma once
 #include "stereo.h"
 
+// The support is absent in 1.9.0 (dropped in r5068)
+#if (IRRLICHT_VERSION_MAJOR == 1) && (IRRLICHT_VERSION_MINOR <= 8)
+#define STEREO_PAGEFLIP_SUPPORTED
+
 class RenderingCorePageflip : public RenderingCoreStereo
 {
 protected:
@@ -35,3 +39,5 @@ public:
 	using RenderingCoreStereo::RenderingCoreStereo;
 	void drawAll() override;
 };
+
+#endif