GL/D3D11: Add scissor support

libobs-d3d11/d3d11-subsystem.cpp

@@ -1386,11 +1386,16 @@ void device_getviewport(device_t device, struct gs_rect *rect)
 void device_setscissorrect(device_t device, struct gs_rect *rect)
 {
 	D3D11_RECT d3drect;
-	d3drect.left   = rect->x;
-	d3drect.top    = rect->y;
-	d3drect.right  = rect->x + rect->cx;
-	d3drect.bottom = rect->y + rect->cy;
-	device->context->RSSetScissorRects(1, &d3drect);
+
+	device->rasterState.scissorEnabled = (rect != NULL);
+
+	if (rect != NULL) {
+		d3drect.left   = rect->x;
+		d3drect.top    = rect->y;
+		d3drect.right  = rect->x + rect->cx;
+		d3drect.bottom = rect->y + rect->cy;
+		device->context->RSSetScissorRects(1, &d3drect);
+	}
 }
 
 void device_ortho(device_t device, float left, float right, float top,

libobs-opengl/gl-subsystem.c

@@ -1180,9 +1180,17 @@ void device_getviewport(device_t device, struct gs_rect *rect)
 void device_setscissorrect(device_t device, struct gs_rect *rect)
 {
 	UNUSED_PARAMETER(device);
-	glScissor(rect->x, rect->y, rect->cx, rect->cy);
-	if (!gl_success("glScissor"))
-		blog(LOG_ERROR, "device_setscissorrect (GL) failed");
+
+	if (rect != NULL) {
+		glScissor(rect->x, rect->y, rect->cx, rect->cy);
+		if (gl_success("glScissor") && gl_enable(GL_SCISSOR_TEST))
+			return;
+
+	} else if (gl_disable(GL_SCISSOR_TEST)) {
+		return;
+	}
+
+	blog(LOG_ERROR, "device_setscissorrect (GL) failed");
 }
 
 void device_ortho(device_t device, float left, float right,