svga: Ensure that the wrong vdecls don't get used in swtnl path

The draw module set new state that didn't require swtnl which caused need_swtnl to
be unset. This caused the call from to svga_update_state(svga, SVGA_STATE_SWTNL_DRAW)
from the vbuf backend to overwrite the vdecls we setup there to be overwritten with
the real buffers vdecls.

3 files changed, 19 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_context.h b/src/gallium/drivers/svga/svga_context.h
index 04e281a506..d4970908b1 100644
--- a/src/gallium/drivers/svga/svga_context.h
+++ b/src/gallium/drivers/svga/svga_context.h
@@ -288,6 +288,11 @@ struct svga_sw_state
    boolean need_swvfetch;
    boolean need_pipeline;
    boolean need_swtnl;
+
+   /* Flag to make sure that need sw is on while
+    * updating state within a swtnl call.
+    */
+   boolean in_swtnl_draw;
 };
 
 
diff --git a/src/gallium/drivers/svga/svga_state_need_swtnl.c b/src/gallium/drivers/svga/svga_state_need_swtnl.c
index 99263d82e1..8ba5ac8cdb 100644
--- a/src/gallium/drivers/svga/svga_state_need_swtnl.c
+++ b/src/gallium/drivers/svga/svga_state_need_swtnl.c
@@ -175,6 +175,14 @@ static int update_need_swtnl( struct svga_context *svga,
       need_swtnl = 1;
    }
 
+   /*
+    * Some state changes the draw module does makes us belive we
+    * we don't need swtnl. This causes the vdecl code to pickup
+    * the wrong buffers and vertex formats. Try trivial/line-wide.
+    */
+   if (svga->state.sw.in_swtnl_draw)
+      need_swtnl = 1;
+
    if (need_swtnl != svga->state.sw.need_swtnl) {
       SVGA_DBG(DEBUG_SWTNL|DEBUG_PERF,
                "%s: need_swvfetch %s, need_pipeline %s\n",
diff --git a/src/gallium/drivers/svga/svga_swtnl_draw.c b/src/gallium/drivers/svga/svga_swtnl_draw.c
index d903984581..05d86e1fb1 100644
--- a/src/gallium/drivers/svga/svga_swtnl_draw.c
+++ b/src/gallium/drivers/svga/svga_swtnl_draw.c
@@ -51,6 +51,9 @@ svga_swtnl_draw_vbo(struct svga_context *svga,
    assert(svga->state.sw.need_swtnl);
    assert(draw);
 
+   /* Make sure that the need_swtnl flag does not go away */
+   svga->state.sw.in_swtnl_draw = TRUE;
+
    ret = svga_update_state(svga, SVGA_STATE_SWTNL_DRAW);
    if (ret) {
       svga_context_flush(svga, NULL);
@@ -119,6 +122,9 @@ svga_swtnl_draw_vbo(struct svga_context *svga,
       pipe_buffer_unmap(&svga->pipe, cb_transfer);
    }
 
+   /* Now safe to remove the need_swtnl flag in any update_state call */
+   svga->state.sw.in_swtnl_draw = FALSE;
+
    return ret;
 }