[Mesa-dev] [PATCH v2 2/3] i965: add flag to enable cut_index

[Jordan Justen]

When brw->prim_restart.enable_cut_index is set, the cut index
will be enabled when uploading index_buffer commands.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_context.c     |    1 +
 src/mesa/drivers/dri/i965/brw_context.h     |    1 +
 src/mesa/drivers/dri/i965/brw_defines.h     |    2 ++
 src/mesa/drivers/dri/i965/brw_draw_upload.c |    9 ++++++++-
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 3ef5a57..e1e18e1 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -296,6 +296,7 @@ brwCreateContext(int api,
    }
 
    brw->prim_restart.in_progress = false;
+   brw->prim_restart.enable_cut_index = false;
 
    brw_init_state( brw );
 
diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 920fdaa..1e21e92 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -1005,6 +1005,7 @@ struct brw_context
    /* PrimitiveRestart */
    struct {
       bool in_progress;
+      bool enable_cut_index;
    } prim_restart;
 };
 
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index aaab5a2..cb93257 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -167,6 +167,8 @@
 
 #define BRW_SPRITE_POINT_ENABLE  16
 
+#define BRW_CUT_INDEX_ENABLE     (1 << 10)
+
 #define BRW_INDEX_BYTE     0
 #define BRW_INDEX_WORD     1
 #define BRW_INDEX_DWORD    2
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index 11b9caa..cf77837 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -851,13 +851,20 @@ static void brw_emit_index_buffer(struct brw_context *brw)
 {
    struct intel_context *intel = &brw->intel;
    const struct _mesa_index_buffer *index_buffer = brw->ib.ib;
+   GLuint cut_index_setting;
 
    if (index_buffer == NULL)
       return;
 
+   if (brw->prim_restart.enable_cut_index) {
+      cut_index_setting = BRW_CUT_INDEX_ENABLE;
+   } else {
+      cut_index_setting = 0;
+   }
+
    BEGIN_BATCH(3);
    OUT_BATCH(CMD_INDEX_BUFFER << 16 |
-             /* cut index enable << 10 */
+             cut_index_setting |
              get_index_type(index_buffer->type) << 8 |
              1);
    OUT_RELOC(brw->ib.bo,
-- 
1.7.9.5