diff --git a/src/gl/renderer/gl_renderstate.cpp b/src/gl/renderer/gl_renderstate.cpp
index f2c66ac630..90aeeb2c8c 100644
--- a/src/gl/renderer/gl_renderstate.cpp
+++ b/src/gl/renderer/gl_renderstate.cpp
@@ -478,6 +478,82 @@ void FGLRenderState::EnableClipDistance(int num, bool state)
 	}
 }
 
+void FGLRenderState::Clear(int targets)
+{
+	// This always clears to default values.
+	int gltarget = 0;
+	if (targets & CT_Depth)
+	{
+		gltarget |= GL_DEPTH_BUFFER_BIT;
+		glClearDepth(1);
+	}
+	if (targets & CT_Stencil)
+	{
+		gltarget |= GL_STENCIL_BUFFER_BIT;
+		glClearStencil(0);
+	}
+	if (targets & CT_Color)
+	{
+		gltarget |= GL_COLOR_BUFFER_BIT;
+		glClearColor(screen->mSceneClearColor[0], screen->mSceneClearColor[1], screen->mSceneClearColor[2], screen->mSceneClearColor[3]);
+	}
+	glClear(gltarget);
+}
+
+void FGLRenderState::EnableStencil(bool on)
+{
+	if (on)
+	{
+		glEnable(GL_STENCIL_TEST);
+	}
+	else
+	{
+		glDisable(GL_STENCIL_TEST);
+	}
+}
+
+void FGLRenderState::SetScissor(int x, int y, int w, int h)
+{
+	if (w > -1)
+	{
+		glEnable(GL_SCISSOR_TEST);
+		glScissor(x, y, w, h);
+	}
+	else
+	{
+		glDisable(GL_SCISSOR_TEST);
+	}
+}
+
+void FGLRenderState::SetViewport(int x, int y, int w, int h)
+{
+	glViewport(x, y, w, h);
+}
+
+void FGLRenderState::EnableDepthTest(bool on)
+{
+	if (on)
+	{
+		glEnable(GL_DEPTH_TEST);
+	}
+	else
+	{
+		glDisable(GL_DEPTH_TEST);
+	}
+}
+
+void FGLRenderState::EnableMultisampling(bool on)
+{
+	if (on)
+	{
+		glEnable(GL_MULTISAMPLE);
+	}
+	else
+	{
+		glDisable(GL_MULTISAMPLE);
+	}
+}
+
 //==========================================================================
 //
 //
diff --git a/src/gl/renderer/gl_renderstate.h b/src/gl/renderer/gl_renderstate.h
index 8d0f787184..ec2a23e5e1 100644
--- a/src/gl/renderer/gl_renderstate.h
+++ b/src/gl/renderer/gl_renderstate.h
@@ -153,6 +153,12 @@ public:
 	void SetStencil(int offs, int op, int flags) override;
 	void SetCulling(int mode) override;
 	void EnableClipDistance(int num, bool state) override;
+	void Clear(int targets) override;
+	void EnableStencil(bool on) override;
+	void SetScissor(int x, int y, int w, int h) override;
+	void SetViewport(int x, int y, int w, int h) override;
+	void EnableDepthTest(bool on) override;
+	void EnableMultisampling(bool on) override;
 
 
 };
diff --git a/src/hwrenderer/scene/hw_renderstate.h b/src/hwrenderer/scene/hw_renderstate.h
index 49d85188a6..bc06e859b2 100644
--- a/src/hwrenderer/scene/hw_renderstate.h
+++ b/src/hwrenderer/scene/hw_renderstate.h
@@ -12,7 +12,14 @@ struct FColormap;
 class IVertexBuffer;
 class IIndexBuffer;
 
-enum EEffect
+enum EClearTarget
+{
+	CT_Depth,
+	CT_Stencil,
+	CT_Color
+};
+
+enum ERenderEffect
 {
 	EFF_NONE = -1,
 	EFF_FOGBOUNDARY,
@@ -440,6 +447,13 @@ public:
 	virtual void SetStencil(int offs, int op, int flags) = 0;
 	virtual void SetCulling(int mode) = 0;
 	virtual void EnableClipDistance(int num, bool state) = 0;
+	virtual void Clear(int targets) = 0;
+	virtual void EnableStencil(bool on) = 0;
+	virtual void SetScissor(int x, int y, int w, int h) = 0;
+	virtual void SetViewport(int x, int y, int w, int h) = 0;
+	virtual void EnableDepthTest(bool on) = 0;
+	virtual void EnableMultisampling(bool on) = 0;
+
 
 };