Move region_alloc() and region_release() to pipe_winsys.

This allows regions to be allocated w/out a rendering context.

1 files changed, 61 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel_winsys/intel_winsys_i915.c b/src/mesa/drivers/dri/intel_winsys/intel_winsys_i915.c
index f6eb050152..c481495309 100644
--- a/src/mesa/drivers/dri/intel_winsys/intel_winsys_i915.c
+++ b/src/mesa/drivers/dri/intel_winsys/intel_winsys_i915.c
@@ -120,6 +120,64 @@ static void intel_i915_batch_flush( struct i915_winsys *sws )
 
 
 
+static struct pipe_region *
+intel_i915_region_alloc(struct pipe_winsys *winsys,
+                        unsigned cpp, unsigned width,
+                        unsigned height, unsigned flags)
+{
+   struct pipe_region *region = calloc(sizeof(*region), 1);
+   const unsigned alignment = 64;
+
+   /* Choose a pitch to match hardware requirements - requires 64 byte
+    * alignment of render targets.  
+    *
+    * XXX: is this ok for textures??
+    * clearly want to be able to render to textures under some
+    * circumstances, but maybe not always a requirement.
+    */
+   unsigned pitch;
+
+   /* XXX is the pitch different for textures vs. drawables? */
+   if (flags & PIPE_SURFACE_FLAG_TEXTURE)  /* or PIPE_SURFACE_FLAG_RENDER? */
+      pitch = ((cpp * width + 63) & ~63) / cpp;
+   else
+      pitch = ((cpp * width + 63) & ~63) / cpp;
+
+   region->cpp = cpp;
+   region->pitch = pitch;
+   region->height = height;     /* needed? */
+   region->refcount = 1;
+
+   region->buffer = winsys->buffer_create( winsys, alignment );
+
+   winsys->buffer_data( winsys,
+                        region->buffer, 
+                        pitch * cpp * height, 
+                        NULL );
+
+   return region;
+}
+
+static void
+intel_i915_region_release(struct pipe_winsys *winsys,
+                          struct pipe_region **region)
+{
+   if (!*region)
+      return;
+
+   assert((*region)->refcount > 0);
+   (*region)->refcount--;
+
+   if ((*region)->refcount == 0) {
+      assert((*region)->map_refcount == 0);
+
+      winsys->buffer_reference( winsys,
+                                &((*region)->buffer), NULL );
+      free(*region);
+   }
+   *region = NULL;
+}
+
 
 struct pipe_context *
 intel_create_i915simple( struct intel_context *intel )
@@ -135,6 +193,9 @@ intel_create_i915simple( struct intel_context *intel )
    iws->winsys.batch_flush = intel_i915_batch_flush;
    iws->intel = intel;
 
+   iws->winsys.region_alloc = intel_i915_region_alloc;
+   iws->winsys.region_release = intel_i915_region_release;
+
    /* Create the i915simple context:
     */
    return i915_create( intel_create_pipe_winsys(intel),