From: Chad Versace <chad.vers...@intel.com>
When rendering to a depth buffer when HiZ is enabled, a GEM region must be
allocated just for HiZ. There are two potential ways to do this:
1. Allocate a separate HiZ region.
2. Allocate a larger depth region, and let the tail be the HiZ region.
Method 1 is chosen because, in the future, it will make lazy resolves
easier to implement.
Signed-off-by: Chad Versace <chad.vers...@intel.com>
---
src/mesa/drivers/dri/intel/intel_fbo.h | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/intel/intel_fbo.h
b/src/mesa/drivers/dri/intel/intel_fbo.h
index 028f657..4c94dba 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.h
+++ b/src/mesa/drivers/dri/intel/intel_fbo.h
@@ -40,6 +40,9 @@ struct intel_renderbuffer
{
struct gl_renderbuffer Base;
struct intel_region *region;
+
+ /** Only used by depth renderbuffers for which HiZ is enabled. */
+ struct intel_region *hiz_region;
};
@@ -80,6 +83,23 @@ intel_get_renderbuffer(struct gl_framebuffer *fb, int
attIndex)
return NULL;
}
+/**
+ * If the framebuffer has a depth buffer attached, then return its HiZ region.
+ * The HiZ region may be null.
+ */
+static INLINE struct intel_region*
+intel_get_hiz_region(struct gl_framebuffer *fb)
+{
+ struct intel_renderbuffer *rb = NULL;
+ if (fb)
+ rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
+
+ if (rb)
+ return rb->hiz_region;
+ else
+ return NULL;
+}
+
extern void
intel_renderbuffer_set_region(struct intel_context *intel,
--
1.7.4.2
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