* Turns out the virtual messes with the data in struct command, so we can't

use it (which isn't really that bad).
* B_SCREEN_TO_SCREEN_BLIT is now working as intended, so we can finally move
  windows and scroll at decent speed :-)
* Implemented a simple version of B_WAIT_ENGINE_IDLE for now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17422 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/graphics/intel_extreme/intel_extreme.h

@@ -176,6 +176,7 @@ struct intel_free_graphics_memory {
 #define RING_BUFFER_START				0x8
 #define RING_BUFFER_CONTROL				0xc
 #define INTEL_RING_BUFFER_SIZE_MASK		0x000ff800
+#define INTEL_RING_BUFFER_HEAD_MASK		0x001ffffc
 #define INTEL_RING_BUFFER_ENABLED		1
 
 #define INTEL_DISPLAY_HTOTAL			0x60000
@@ -248,6 +249,7 @@ struct intel_free_graphics_memory {
 
 // 2D acceleration
 #define COMMAND_BLIT					0x54c00006
+#define COMMAND_BLIT_RGBA				0x00300000
 
 // overlay