1 files changed, 93 insertions, 0 deletions
diff --git a/src/gallium/drivers/i915simple/i915_texture.c b/src/gallium/drivers/i915simple/i915_texture.c
index 1ed38563a05..7f0a4dbd932 100644
--- a/src/gallium/drivers/i915simple/i915_texture.c
+++ b/src/gallium/drivers/i915simple/i915_texture.c
@@ -738,6 +738,95 @@ i915_tex_surface_destroy(struct pipe_surface *surf)
 
 
 /*
+ * Screen transfer functions
+ */
+
+
+static struct pipe_transfer*
+i915_get_tex_transfer(struct pipe_screen *screen,
+                      struct pipe_texture *texture,
+                      unsigned face, unsigned level, unsigned zslice,
+                      enum pipe_transfer_usage usage, unsigned x, unsigned y,
+                      unsigned w, unsigned h)
+{
+   struct i915_texture *tex = (struct i915_texture *)texture;
+   struct i915_transfer *trans;
+   unsigned offset;  /* in bytes */
+
+   if (texture->target == PIPE_TEXTURE_CUBE) {
+      offset = tex->image_offset[level][face];
+   }
+   else if (texture->target == PIPE_TEXTURE_3D) {
+      offset = tex->image_offset[level][zslice];
+   }
+   else {
+      offset = tex->image_offset[level][0];
+      assert(face == 0);
+      assert(zslice == 0);
+   }
+
+   trans = CALLOC_STRUCT(i915_transfer);
+   if (trans) {
+      pipe_texture_reference(&trans->base.texture, texture);
+      trans->base.format = trans->base.format;
+      trans->base.x = x;
+      trans->base.y = y;
+      trans->base.width = w;
+      trans->base.height = h;
+      trans->base.block = texture->block;
+      trans->base.nblocksx = texture->nblocksx[level];
+      trans->base.nblocksy = texture->nblocksy[level];
+      trans->base.stride = tex->stride;
+      trans->offset = offset;
+      trans->base.usage = usage;
+   }
+   return &trans->base;
+}
+
+static void *
+i915_transfer_map(struct pipe_screen *screen,
+                  struct pipe_transfer *transfer)
+{
+   struct i915_texture *tex = (struct i915_texture *)transfer->texture;
+   char *map;
+   unsigned flags = 0;
+
+   if (transfer->usage != PIPE_TRANSFER_WRITE)
+      flags |= PIPE_BUFFER_USAGE_CPU_READ;
+
+   if (transfer->usage != PIPE_TRANSFER_READ)
+      flags |= PIPE_BUFFER_USAGE_CPU_WRITE;
+
+   map = pipe_buffer_map(screen, tex->buffer, flags);
+   if (map == NULL)
+      return NULL;
+
+   if (flags & PIPE_BUFFER_USAGE_CPU_WRITE) {
+      /* XXX Do something to notify contexts of a texture change. */
+   }
+   
+   return map + i915_transfer(transfer)->offset +
+      transfer->y / transfer->block.height * transfer->stride +
+      transfer->x / transfer->block.width * transfer->block.size;
+}
+
+static void
+i915_transfer_unmap(struct pipe_screen *screen,
+                    struct pipe_transfer *transfer)
+{
+   struct i915_texture *tex = (struct i915_texture *)transfer->texture;
+   pipe_buffer_unmap(screen, tex->buffer);
+}
+
+static void
+i915_tex_transfer_destroy(struct pipe_transfer *trans)
+{
+   pipe_texture_reference(&trans->texture, NULL);
+   FREE(trans);
+}
+
+
+/*
  * Other texture functions
  */
 
@@ -750,6 +839,10 @@ i915_init_screen_texture_functions(struct i915_screen *is)
    is->base.texture_destroy = i915_texture_destroy;
    is->base.get_tex_surface = i915_get_tex_surface;
    is->base.tex_surface_destroy = i915_tex_surface_destroy;
+   is->base.get_tex_transfer = i915_get_tex_transfer;
+   is->base.transfer_map = i915_transfer_map;
+   is->base.transfer_unmap = i915_transfer_unmap;
+   is->base.tex_transfer_destroy = i915_tex_transfer_destroy;
 }
 
 boolean i915_get_texture_buffer(struct pipe_texture *texture,