gallium/svga: Upload only parts of user-buffers that we actually use
Stream user buffer contents rather than trying to maintain persistent
host / hardware copies.
Resulting negative array offsets are not allowed by the hardware,
(well, at least not according to header files), so adjust index bias
to make all array offsets positive.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
diff --git a/src/gallium/drivers/svga/svga_resource_buffer.h b/src/gallium/drivers/svga/svga_resource_buffer.h
index 9503221..2ae44d2 100644
--- a/src/gallium/drivers/svga/svga_resource_buffer.h
+++ b/src/gallium/drivers/svga/svga_resource_buffer.h
@@ -132,6 +132,13 @@
} uploaded;
/**
+ * For user buffers, this is the offset to the data about to be
+ * referenced by the next draw command, and hence the data that needs
+ * to be uploaded.
+ */
+ unsigned source_offset;
+
+ /**
* DMA'ble memory.
*
* A piece of GMR memory, with the same size of the buffer. It is created