From: Chad Versace <c...@chad-versace.us>
Signed-off-by: Chad Versace <c...@chad-versace.us>
---
src/mesa/drivers/dri/i965/brw_context.h | 21 ++++++++++++++++++++-
src/mesa/drivers/dri/i965/brw_misc_state.c | 3 +++
2 files changed, 23 insertions(+), 1 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_context.h
b/src/mesa/drivers/dri/i965/brw_context.h
index ab0c78f..9af97b5 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -139,7 +139,7 @@ struct brw_context;
* by any 3D rendering.
*/
#define BRW_NEW_BATCH 0x10000
-/** brw->depth_region updated */
+/** \see brw.state.depth_region */
#define BRW_NEW_DEPTH_BUFFER 0x20000
#define BRW_NEW_NR_WM_SURFACES 0x40000
#define BRW_NEW_NR_VS_SURFACES 0x80000
@@ -464,8 +464,27 @@ struct brw_context
struct {
struct brw_state_flags dirty;
+ /**
+ * \name Cached region pointers
+ *
+ * When the draw buffer is updated, often the depth buffer is not
+ * changed. Caching the pointer to the buffer's region allows us to
+ * detect when the buffer has in fact changed, and allows us to avoid
+ * updating the buffer's GPU state when it has not.
+ *
+ * The original of each cached pointer is an instance of
+ * \c intel_renderbuffer.region.
+ *
+ * \see brw_set_draw_region()
+ *
+ * \{
+ */
+
+ /** \see struct brw_tracked_state brw_depthbuffer */
struct intel_region *depth_region;
+ /** \} */
+
/**
* List of buffers accumulated in brw_validate_state to receive
* drm_intel_bo_check_aperture treatment before exec, so we can
diff --git a/src/mesa/drivers/dri/i965/brw_misc_state.c
b/src/mesa/drivers/dri/i965/brw_misc_state.c
index 92eba8f..74e911b 100644
--- a/src/mesa/drivers/dri/i965/brw_misc_state.c
+++ b/src/mesa/drivers/dri/i965/brw_misc_state.c
@@ -284,6 +284,9 @@ static void emit_depthbuffer(struct brw_context *brw)
}
}
+/**
+ * \see brw_context.state.depth_region
+ */
const struct brw_tracked_state brw_depthbuffer = {
.dirty = {
.mesa = 0,
--
1.7.4.2
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