draw: hide passthrough shading paths behind an environment variable

3 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index cdca556fbdf..1e70a775233 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -49,6 +49,8 @@ struct draw_context *draw_create( void )
    draw->use_sse = FALSE;
 #endif
 
+   draw->use_pt_shaders = GETENV( "GALLIUM_PT_SHADERS" ) != NULL;
+
    /* create pipeline stages */
    draw->pipeline.wide_line  = draw_wide_line_stage( draw );
    draw->pipeline.wide_point = draw_wide_point_stage( draw );
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 1115166192e..3042d268479 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -276,6 +276,7 @@ struct draw_context
    boolean line_stipple;       /**< do line stipple? */
    boolean point_sprite;       /**< convert points to quads for sprites? */
    boolean use_sse;
+   boolean use_pt_shaders;	/* temporary flag to switch on pt shader paths */
 
    /* If a prim stage introduces new vertex attributes, they'll be stored here
     */
diff --git a/src/gallium/auxiliary/draw/draw_pt.c b/src/gallium/auxiliary/draw/draw_pt.c
index c8663c0e844..c67a2179820 100644
--- a/src/gallium/auxiliary/draw/draw_pt.c
+++ b/src/gallium/auxiliary/draw/draw_pt.c
@@ -79,6 +79,9 @@ draw_pt_arrays(struct draw_context *draw,
     *     - backend  -- the vbuf_render provided by the driver.
     */
 
+   if (shading && !draw->use_pt_shaders)
+      return FALSE;
+
 
    if (!cliptest && !pipeline && !shading) {
       /* This is the 'passthrough' path: