We're now using a secondary (high priority) ring buffer for hardware

overlay - this will improve the overlay performance when the engine is
under load (the acceleration engine will use the primary lower priority
ring buffer).



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17411 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/graphics/intel_extreme/intel_extreme.cpp

@@ -167,6 +167,7 @@ intel_extreme_init(intel_info &info)
 	// reserve ring buffer memory (currently, this memory is placed in
 	// the graphics memory), but this could bring us problems with
 	// write combining...
+
 	ring_buffer &primary = info.shared_info->primary_ring_buffer;
 	if (mem_alloc(info.memory_manager, B_PAGE_SIZE, &info,
 			&primary.handle, &primary.offset) == B_OK) {
@@ -175,6 +176,14 @@ intel_extreme_init(intel_info &info)
 		primary.base = info.graphics_memory + primary.offset;
 	}
 
+	ring_buffer &secondary = info.shared_info->secondary_ring_buffer;
+	if (mem_alloc(info.memory_manager, B_PAGE_SIZE, &info,
+			&secondary.handle, &secondary.offset) == B_OK) {
+		secondary.register_base = INTEL_SECONDARY_RING_BUFFER_0;
+		secondary.size = B_PAGE_SIZE;
+		secondary.base = info.graphics_memory + secondary.offset;
+	}
+
 	// no errors, so keep mappings
 	graphicsMapper.Keep();
 	mmioMapper.Keep();