#ifndef U_SIMPLE_SCREEN_H
#define U_SIMPLE_SCREEN_H
+#include "pipe/p_format.h"
+
struct pipe_screen;
-struct pipe_winsys;
+struct pipe_fence_handle;
+struct pipe_surface;
+struct pipe_resource;
+
+/**
+ * Gallium3D drivers are (meant to be!) independent of both GL and the
+ * window system. The window system provides a buffer manager and a
+ * set of additional hooks for things like command buffer submission,
+ * etc.
+ *
+ * There clearly has to be some agreement between the window system
+ * driver and the hardware driver about the format of command buffers,
+ * etc.
+ */
+struct pipe_winsys
+{
+ void (*destroy)( struct pipe_winsys *ws );
+
+ /** Returns name of this winsys interface */
+ const char *(*get_name)( struct pipe_winsys *ws );
+
+ /**
+ * Do any special operations to ensure buffer size is correct
+ */
+ void (*update_buffer)( struct pipe_winsys *ws,
+ void *context_private );
+ /**
+ * Do any special operations to ensure frontbuffer contents are
+ * displayed, eg copy fake frontbuffer.
+ */
+ void (*flush_frontbuffer)( struct pipe_winsys *ws,
+ struct pipe_surface *surf,
+ void *context_private );
+
+
+ /**
+ * Buffer management. Buffer attributes are mostly fixed over its lifetime.
+ *
+ * Remember that gallium gets to choose the interface it needs, and the
+ * window systems must then implement that interface (rather than the
+ * other way around...).
+ *
+ * usage is a bitmask of PIPE_BIND_*.
+ * All possible usages must be present.
+ *
+ * alignment indicates the client's alignment requirements, eg for
+ * SSE instructions.
+ */
+ struct pipe_resource *(*buffer_create)( struct pipe_winsys *ws,
+ unsigned alignment,
+ unsigned usage,
+ unsigned size );
+
+ /**
+ * Create a buffer that wraps user-space data.
+ *
+ * Effectively this schedules a delayed call to buffer_create
+ * followed by an upload of the data at *some point in the future*,
+ * or perhaps never. Basically the allocate/upload is delayed
+ * until the buffer is actually passed to hardware.
+ *
+ * The intention is to provide a quick way to turn regular data
+ * into a buffer, and secondly to avoid a copy operation if that
+ * data subsequently turns out to be only accessed by the CPU.
+ *
+ * Common example is OpenGL vertex buffers that are subsequently
+ * processed either by software TNL in the driver or by passing to
+ * hardware.
+ *
+ * XXX: What happens if the delayed call to buffer_create() fails?
+ *
+ * Note that ptr may be accessed at any time upto the time when the
+ * buffer is destroyed, so the data must not be freed before then.
+ */
+ struct pipe_resource *(*user_buffer_create)(struct pipe_winsys *ws,
+ void *ptr,
+ unsigned bytes);
+
+ /**
+ * Allocate storage for a display target surface.
+ *
+ * Often surfaces which are meant to be blitted to the front screen (i.e.,
+ * display targets) must be allocated with special characteristics, memory
+ * pools, or obtained directly from the windowing system.
+ *
+ * This callback is invoked by the pipe_screen when creating a texture marked
+ * with the PIPE_BIND_DISPLAY_TARGET flag to get the underlying
+ * buffer storage.
+ */
+ struct pipe_resource *(*surface_buffer_create)(struct pipe_winsys *ws,
+ unsigned width, unsigned height,
+ enum pipe_format format,
+ unsigned usage,
+ unsigned tex_usage,
+ unsigned *stride);
+
+
+ /**
+ * Map the entire data store of a buffer object into the client's address.
+ * flags is bitmask of PIPE_BUFFER_USAGE_CPU_READ/WRITE flags.
+ */
+ void *(*buffer_map)( struct pipe_winsys *ws,
+ struct pipe_resource *buf,
+ unsigned usage );
+
+ void (*buffer_unmap)( struct pipe_winsys *ws,
+ struct pipe_resource *buf );
+
+ void (*buffer_destroy)( struct pipe_resource *buf );
+
+
+ /** Set ptr = fence, with reference counting */
+ void (*fence_reference)( struct pipe_winsys *ws,
+ struct pipe_fence_handle **ptr,
+ struct pipe_fence_handle *fence );
+
+ /**
+ * Checks whether the fence has been signalled.
+ * \param flags driver-specific meaning
+ * \return zero on success.
+ */
+ int (*fence_signalled)( struct pipe_winsys *ws,
+ struct pipe_fence_handle *fence,
+ unsigned flag );
+
+ /**
+ * Wait for the fence to finish.
+ * \param flags driver-specific meaning
+ * \return zero on success.
+ */
+ int (*fence_finish)( struct pipe_winsys *ws,
+ struct pipe_fence_handle *fence,
+ unsigned flag );
+
+};
/**
* The following function initializes a simple passthrough screen.
projects / mesa.git / blobdiff