i965: Add tessellation control shaders.

The TCS is the first tessellation shader stage, and the most
complicated.  It has access to each of the control points in the input
patch, and computes a new output patch.  There is one logical invocation
per output control point; all invocations run in parallel, and can
communicate by reading and writing output variables.

One of the main responsibilities of the TCS is to write the special
gl_TessLevelOuter[] and gl_TessLevelInner[] output variables which
control how much new geometry the hardware tessellation engine will
produce.  Otherwise, it simply writes outputs that are passed along
to the TES.

We run in SIMD4x2 mode, handling two logical invocations per EU thread.
The hardware doesn't properly manage the dispatch mask for us; it always
initializes it to 0xFF.  We wrap the whole program in an IF..ENDIF block
to handle an odd number of invocations, essentially falling back to
SIMD4x1 on the last thread.

v2: Update comments (requested by Jordan Justen).

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 5e840d18920..1d989f351bf 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -1704,6 +1704,12 @@ brw_vertex_program_const(const struct gl_vertex_program *p)
    return (const struct brw_vertex_program *) p;
 }
 
+static inline struct brw_tess_ctrl_program *
+brw_tess_ctrl_program(struct gl_tess_ctrl_program *p)
+{
+   return (struct brw_tess_ctrl_program *) p;
+}
+
 static inline struct brw_tess_eval_program *
 brw_tess_eval_program(struct gl_tess_eval_program *p)
 {