draw: add fetch-shade-emit path

Enable with TEST_FSE=t.  Performs fetch from API-provided vertex buffers,
transformation with one of three (two working) hard-coded shaders, and
final emit to hardware vertices all in a single pass.

Currently only really useful for profiling in conjunction with SP_NO_RAST=t.

1 files changed, 21 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt.c b/src/gallium/auxiliary/draw/draw_pt.c
index bccde6c5fd2..448deef98c6 100644
--- a/src/gallium/auxiliary/draw/draw_pt.c
+++ b/src/gallium/auxiliary/draw/draw_pt.c
@@ -64,7 +64,7 @@ draw_pt_arrays(struct draw_context *draw,
       opt |= PT_PIPELINE;
    }
 
-   if (!draw->bypass_clipping) {
+   if (!draw->bypass_clipping && !draw->pt.test_fse) {
       opt |= PT_CLIPTEST;
    }
 
@@ -72,16 +72,20 @@ draw_pt_arrays(struct draw_context *draw,
       opt |= PT_SHADE;
    }
 
-   if (opt)
-      middle = draw->pt.middle.general;
-   else
+
+   if (opt == 0) 
       middle = draw->pt.middle.fetch_emit;
+   else
+      middle = draw->pt.middle.general;
 
 
    /* Pick the right frontend
     */
    if (draw->pt.user.elts) {
       frontend = draw->pt.front.vcache;
+   } else if (opt == PT_SHADE && draw->pt.test_fse) {
+      /* should be a middle end.. */
+      frontend = draw->pt.front.fetch_shade_emit;
    } else {
       frontend = draw->pt.front.varray;
    }
@@ -113,6 +117,14 @@ boolean draw_pt_init( struct draw_context *draw )
    if (!draw->pt.middle.fetch_emit)
       return FALSE;
 
+   draw->pt.test_fse = GETENV("DRAW_FSE") != NULL;
+   if (draw->pt.test_fse) {
+      draw->pt.front.fetch_shade_emit = draw_pt_fetch_shade_emit( draw );
+      if (!draw->pt.front.fetch_shade_emit)
+         return FALSE;
+   }
+
+
    draw->pt.middle.general = draw_pt_fetch_pipeline_or_emit( draw );
    if (!draw->pt.middle.general)
       return FALSE;
@@ -133,6 +145,11 @@ void draw_pt_destroy( struct draw_context *draw )
       draw->pt.middle.fetch_emit = NULL;
    }
 
+   if (draw->pt.front.fetch_shade_emit) {
+      draw->pt.front.fetch_shade_emit->destroy( draw->pt.front.fetch_shade_emit );
+      draw->pt.front.fetch_shade_emit = NULL;
+   }
+
    if (draw->pt.front.vcache) {
       draw->pt.front.vcache->destroy( draw->pt.front.vcache );
       draw->pt.front.vcache = NULL;