diff --git a/src/camera.cpp b/src/camera.cpp
index 4bfc0cf..07d1c9f 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -356,9 +356,9 @@ Camera::clear(RGBA *col, uint32 mode)
 }
 
 void
-Camera::showRaster(void)
+Camera::showRaster(uint32 flags)
 {
-	engine->device.showRaster(this->frameBuffer);
+	this->frameBuffer->show(flags);
 }
 
 void
diff --git a/src/d3d/d3ddevice.cpp b/src/d3d/d3ddevice.cpp
index 21ae6e2..8fde625 100644
--- a/src/d3d/d3ddevice.cpp
+++ b/src/d3d/d3ddevice.cpp
@@ -1034,9 +1034,15 @@ clearCamera(Camera *cam, RGBA *col, uint32 mode)
 }
 
 static void
-showRaster(Raster *raster)
+showRaster(Raster *raster, uint32 flag)
 {
-	// TODO: do this properly!
+	UINT interval = flag & Raster::FLIPWAITVSYNCH ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+	if(d3d9Globals.present.PresentationInterval != interval){
+		d3d9Globals.present.PresentationInterval = interval;
+		releaseVideoMemory();
+		d3d::d3ddevice->Reset(&d3d9Globals.present);
+		restoreVideoMemory();
+	}
 
 	// not used but we want cameras to have rasters
 	assert(raster);
@@ -1294,8 +1300,8 @@ startD3D(void)
 	d3d9Globals.present.AutoDepthStencilFormat     = zformat;
 	d3d9Globals.present.Flags                      = 0;
 	d3d9Globals.present.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
-	d3d9Globals.present.PresentationInterval       = D3DPRESENT_INTERVAL_ONE;
-//	d3d9Globals.present.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;
+//	d3d9Globals.present.PresentationInterval       = D3DPRESENT_INTERVAL_ONE;
+	d3d9Globals.present.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;
 
 	assert(d3d::d3ddevice == nil);
 
diff --git a/src/engine.cpp b/src/engine.cpp
index eaa7f58..d99c602 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -405,7 +405,7 @@ namespace null {
 void beginUpdate(Camera*) { }
 void endUpdate(Camera*) { }
 void clearCamera(Camera*,RGBA*,uint32) { }
-void showRaster(Raster*) { }
+void showRaster(Raster*,uint32) { }
 
 void   setRenderState(int32, void*) { }
 void  *getRenderState(int32) { return 0; }
diff --git a/src/gl/gl3device.cpp b/src/gl/gl3device.cpp
index 8370ed7..c209aff 100644
--- a/src/gl/gl3device.cpp
+++ b/src/gl/gl3device.cpp
@@ -761,12 +761,16 @@ clearCamera(Camera *cam, RGBA *col, uint32 mode)
 }
 
 static void
-showRaster(Raster *raster)
+showRaster(Raster *raster, uint32 flags)
 {
 	// TODO: do this properly!
 #ifdef LIBRW_SDL2
 	SDL_GL_SwapWindow(glGlobals.window);
 #else
+	if(flags & Raster::FLIPWAITVSYNCH)
+		glfwSwapInterval(1);
+	else
+		glfwSwapInterval(0);
 	glfwSwapBuffers(glGlobals.window);
 #endif
 }
diff --git a/src/raster.cpp b/src/raster.cpp
index 3b2390d..d9bc806 100644
--- a/src/raster.cpp
+++ b/src/raster.cpp
@@ -182,6 +182,12 @@ Raster::toImage(void)
 	return engine->driver[this->platform]->rasterToImage(this);
 }
 
+void
+Raster::show(uint32 flags)
+{
+	engine->device.showRaster(this, flags);
+}
+
 Raster*
 Raster::pushContext(Raster *raster)
 {
diff --git a/src/rwengine.h b/src/rwengine.h
index a32db04..50b0703 100644
--- a/src/rwengine.h
+++ b/src/rwengine.h
@@ -45,7 +45,7 @@ struct Device
 	void  (*beginUpdate)(Camera*);
 	void  (*endUpdate)(Camera*);
 	void  (*clearCamera)(Camera*, RGBA *col, uint32 mode);
-	void  (*showRaster)(Raster *raster);
+	void  (*showRaster)(Raster *raster, uint32 flags);
 	bool32 (*rasterRenderFast)(Raster *raster, int32 x, int32 y);
 	void  (*setRenderState)(int32 state, void *value);
 	void *(*getRenderState)(int32 state);
diff --git a/src/rwobjects.h b/src/rwobjects.h
index fe7e7dd..a7532ed 100644
--- a/src/rwobjects.h
+++ b/src/rwobjects.h
@@ -179,6 +179,8 @@ struct RasterLevels
 
 struct Raster
 {
+	enum { FLIPWAITVSYNCH = 1 };
+
 	PLUGINBASE
 	int32 platform;
 
@@ -219,6 +221,8 @@ struct Raster
 	static int32 calculateNumLevels(int32 width, int32 height);
 	static bool formatHasAlpha(int32 format);
 
+	void show(uint32 flags);
+
 	static Raster *pushContext(Raster *raster);
 	static Raster *popContext(void);
 	static Raster *getCurrentContext(void);
@@ -698,7 +702,7 @@ struct Camera
 	void beginUpdate(void) { this->beginUpdateCB(this); }
 	void endUpdate(void) { this->endUpdateCB(this); }
 	void clear(RGBA *col, uint32 mode);
-	void showRaster(void);
+	void showRaster(uint32 flags);
 	void setNearPlane(float32);
 	void setFarPlane(float32);
 	void setViewWindow(const V2d *window);
diff --git a/tools/imguitest/main.cpp b/tools/imguitest/main.cpp
index fb80e08..6806d2d 100644
--- a/tools/imguitest/main.cpp
+++ b/tools/imguitest/main.cpp
@@ -112,7 +112,7 @@ Draw(float timeDelta)
 	ImGui::Render();
 
 	Scene.camera->endUpdate();
-	Scene.camera->showRaster();
+	Scene.camera->showRaster(0);
 }
 
 
diff --git a/tools/lights/main.cpp b/tools/lights/main.cpp
index 2fb2bea..5d2bab1 100644
--- a/tools/lights/main.cpp
+++ b/tools/lights/main.cpp
@@ -303,7 +303,7 @@ Draw(float timeDelta)
 	ImGui::Render();
 
 	Scene.camera->endUpdate();
-	Scene.camera->showRaster();
+	Scene.camera->showRaster(0);
 }
 
 
diff --git a/tools/playground/main.cpp b/tools/playground/main.cpp
index d86d2ab..655e6b4 100644
--- a/tools/playground/main.cpp
+++ b/tools/playground/main.cpp
@@ -338,8 +338,8 @@ im3dtest(void)
 		verts[i].setV(vs[i].v);
 	}
 
-//	rw::SetRenderStatePtr(rw::TEXTURERASTER, tex->raster);
-	rw::SetRenderStatePtr(rw::TEXTURERASTER, testfont->raster);
+	rw::SetRenderStatePtr(rw::TEXTURERASTER, tex->raster);
+//	rw::SetRenderStatePtr(rw::TEXTURERASTER, testfont->raster);
 //	rw::SetRenderStatePtr(rw::TEXTURERASTER, frontbuffer->raster);
 	rw::SetRenderState(rw::TEXTUREADDRESS, rw::Texture::WRAP);
 	rw::SetRenderState(rw::TEXTUREFILTER, rw::Texture::NEAREST);
@@ -408,7 +408,7 @@ extern void endSoftras(void);
 
 	camera->m_rwcam->endUpdate();
 
-	camera->m_rwcam->showRaster();
+	camera->m_rwcam->showRaster(0);
 }