gallium: add flag PIPE_TRANSFER_MAP_PERMANENTLY

Please see the diff for further info.

This paves the way for moving user buffer uploads out of drivers and should
allow to clean up the mess in u_upload_mgr in the meantime.

For now only allowed for buffers on r300 and r600.

Acked-by: Christian König <[email protected]>

2 files changed, 12 insertions, 2 deletions

diff --git a/src/gallium/drivers/i915/i915_resource_buffer.c b/src/gallium/drivers/i915/i915_resource_buffer.c
index 77c03450b3a..c54e481698e 100644
--- a/src/gallium/drivers/i915/i915_resource_buffer.c
+++ b/src/gallium/drivers/i915/i915_resource_buffer.c
@@ -68,8 +68,13 @@ i915_get_transfer(struct pipe_context *pipe,
                   const struct pipe_box *box)
 {
    struct i915_context *i915 = i915_context(pipe);
-   struct pipe_transfer *transfer = util_slab_alloc(&i915->transfer_pool);
+   struct pipe_transfer *transfer;
 
+   if (usage & PIPE_TRANSFER_MAP_PERMANENTLY) {
+      return NULL;
+   }
+
+   transfer = util_slab_alloc(&i915->transfer_pool);
    if (transfer == NULL)
       return NULL;
 
diff --git a/src/gallium/drivers/i915/i915_resource_texture.c b/src/gallium/drivers/i915/i915_resource_texture.c
index 8ff733a7be5..64d071c9d53 100644
--- a/src/gallium/drivers/i915/i915_resource_texture.c
+++ b/src/gallium/drivers/i915/i915_resource_texture.c
@@ -720,9 +720,14 @@ i915_texture_get_transfer(struct pipe_context *pipe,
 {
    struct i915_context *i915 = i915_context(pipe);
    struct i915_texture *tex = i915_texture(resource);
-   struct i915_transfer *transfer = util_slab_alloc(&i915->texture_transfer_pool);
+   struct i915_transfer *transfer;
    boolean use_staging_texture = FALSE;
 
+   if (usage & PIPE_TRANSFER_MAP_PERMANENTLY) {
+      return NULL;
+   }
+
+   transfer = util_slab_alloc(&i915->texture_transfer_pool);
    if (transfer == NULL)
       return NULL;