glState: Also track the scissor test state.

Author: CrossVR

src/Layers/xrRenderGL/glState.cpp

@@ -62,6 +62,11 @@ void glState::Apply()
 
 	CHK_GL(glDepthMask(m_pDepthStencilState.DepthWriteMask ? GL_TRUE : GL_FALSE));
 
+	if (m_pRasterizerState.ScissorEnable)
+		glEnable(GL_SCISSOR_TEST);
+	else
+		glDisable(GL_SCISSOR_TEST);
+
 	if (m_pBlendState.BlendEnable)
 		glEnable(GL_BLEND);
 	else
@@ -99,6 +104,10 @@ void glState::UpdateRenderState(u32 name, u32 value)
 			m_pRasterizerState.CullMode = (D3DCULL)value;
 			break;
 
+		case D3DRS_SCISSORTESTENABLE:
+			m_pRasterizerState.ScissorEnable = value;
+			break;
+
 		case D3DRS_ZENABLE:
 			m_pDepthStencilState.DepthEnable = value ? TRUE : FALSE;
 			break;

src/Layers/xrRenderGL/glState.h

@@ -5,6 +5,7 @@
 typedef struct
 {
 	D3DCULL CullMode;
+	BOOL ScissorEnable;
 } D3D_RASTERIZER_STATE;
 
 typedef struct