gallium: No longer allow CPU mapping surfaces directly.

Instead, a new pipe_transfer object has to be created and mapped for
transferring data between the CPU and a texture. This gives the driver more
flexibility for textures in address spaces that aren't CPU accessible.

This is a first pass; softpipe/xlib builds and runs glxgears, but it only shows
a black window. Looks like something's off related to the Z buffer, so the
depth test always fails.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 4f0b301f317..0d70348c11d 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -194,6 +194,16 @@ enum pipe_texture_target {
 
 
 /**
+ * Transfer object usage flags
+ */
+enum pipe_transfer_usage {
+   PIPE_TRANSFER_READ,
+   PIPE_TRANSFER_WRITE,
+   PIPE_TRANSFER_READ_WRITE //< Read/modify/write
+};
+
+
+/**
  * Buffer usage flags
  */
 #define PIPE_BUFFER_USAGE_CPU_READ  (1 << 0)