A new API to implement glInvalidateFramebuffer() and friends. It is
similar to invalidate_resource() but can be used to invalidate a
specific layer/level, so it is suitable to use for user FBOs in addition
to window system framebuffer.
Signed-off-by: Rob Clark <robdcl...@gmail.com>
---
src/gallium/docs/source/context.rst | 18 ++++++++++++++++++
src/gallium/include/pipe/p_context.h | 18 ++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/src/gallium/docs/source/context.rst
b/src/gallium/docs/source/context.rst
index 20d0df79312..9f3cd49ee31 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -740,7 +740,25 @@ of the buffer is not a multiple of the page size, changing
the commit state of
the last (partial) page requires a box that ends at the end of the buffer
(i.e., box->x + box->width == buffer->width0).
+.. _invalidate_surface:
+invalidate_surface
+%%%%%%%%%%%%%%%%%%
+
+This optional function marks a surface, or a portion of a surface, as invalid,
+for example to implement glInvalidateFramebuffer() (and friends). It is
+useful in particular for tiler GPUs, as a way to avoid unnecessary transfers
+between system memory and tile buffer.
+
+For example, invalidating a surface after rendering, but before flush, can
+be used to avoid tile to system memory transfer (for example, if zs can be
+discarded). And an invalidate after flush before rendering can be used to
+avoid a system memory to tile buffer transfer.
+
+Invalidating a partial surface can also be used to avoid unnecessary transfer
+from system memory to tile buffer in the case of a scissored clear (which is
+implemented via ->draw_vbo() by the state tracker) by invalidating the
+scissored region.
.. _pipe_transfer:
diff --git a/src/gallium/include/pipe/p_context.h
b/src/gallium/include/pipe/p_context.h
index e07b76d4f03..4dfc87faff6 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -803,6 +803,24 @@ struct pipe_context {
void (*invalidate_resource)(struct pipe_context *ctx,
struct pipe_resource *resource);
+ /**
+ * Like ->invalidate_resource, but can invalidate a specific layer and level
+ * of a resource, and optionally a specific sub-region of the resource (if
+ * region is not NULL).
+ *
+ * If the backing surf->texture has just a single layer and level (like
+ * window system buffers), and region is NULL, it is equivalent to
+ * ->invalidate_resource().
+ *
+ * \param ctx pipe context
+ * \param surf surface to invalidate
+ * \param region NULL to invalidate whole surface, otherwise specifies which
+ * portion of the surface is invalidated
+ */
+ void (*invalidate_surface)(struct pipe_context *ctx,
+ struct pipe_surface *surf,
+ const struct pipe_box *region);
+
/**
* Return information about unexpected device resets.
*/
--
2.19.2
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
