softpipe: use the polygon stipple utility module

This is an alternative to the draw module's polygon stipple stage.
The softpipe implementation here is just a test.  The advantange of
using the new polygon stipple utility module (with other drivers)
is we can avoid software vertex processing in the draw module and
get much better performance.
Polygon stipple doesn't require special vertex processing like
the other draw module stage.

1 files changed, 74 insertions, 4 deletions

diff --git a/src/gallium/drivers/softpipe/sp_state_derived.c b/src/gallium/drivers/softpipe/sp_state_derived.c
index 583d0bd9f7b..fd688089a3e 100644
--- a/src/gallium/drivers/softpipe/sp_state_derived.c
+++ b/src/gallium/drivers/softpipe/sp_state_derived.c
@@ -25,8 +25,10 @@
  * 
  **************************************************************************/
 
+#include "util/u_inlines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
+#include "util/u_pstipple.h"
 #include "pipe/p_shader_tokens.h"
 #include "draw/draw_context.h"
 #include "draw/draw_vertex.h"
@@ -242,12 +244,15 @@ update_tgsi_samplers( struct softpipe_context *softpipe )
 
 
 static void
-update_fragment_shader(struct softpipe_context *softpipe)
+update_fragment_shader(struct softpipe_context *softpipe, unsigned prim)
 {
    struct sp_fragment_shader_variant_key key;
 
    memset(&key, 0, sizeof(key));
 
+   if (prim == PIPE_PRIM_TRIANGLES)
+      key.polygon_stipple = softpipe->rasterizer->poly_stipple_enable;
+
    if (softpipe->fs) {
       softpipe->fs_variant = softpipe_find_fs_variant(softpipe,
                                                       softpipe->fs, &key);
@@ -276,11 +281,63 @@ update_fragment_shader(struct softpipe_context *softpipe)
 }
 
 
+/**
+ * This should be called when the polygon stipple pattern changes.
+ * We create a new texture from the stipple pattern and create a new
+ * sampler view.
+ */
+static void
+update_polygon_stipple_pattern(struct softpipe_context *softpipe)
+{
+   struct pipe_resource *tex;
+   struct pipe_sampler_view *view;
+
+   tex = util_pstipple_create_stipple_texture(&softpipe->pipe,
+                                              softpipe->poly_stipple.stipple);
+   pipe_resource_reference(&softpipe->pstipple.texture, tex);
+
+   view = util_pstipple_create_sampler_view(&softpipe->pipe, tex);
+   pipe_sampler_view_reference(&softpipe->pstipple.sampler_view, view);
+}
+
+
+/**
+ * Should be called when polygon stipple is enabled/disabled or when
+ * the fragment shader changes.
+ * We add/update the fragment sampler and sampler views to sample from
+ * the polygon stipple texture.  The texture unit that we use depends on
+ * the fragment shader (we need to use a unit not otherwise used by the
+ * shader).
+ */
+static void
+update_polygon_stipple_enable(struct softpipe_context *softpipe, unsigned prim)
+{
+   if (prim == PIPE_PRIM_TRIANGLES &&
+       softpipe->fs_variant->key.polygon_stipple) {
+      const unsigned unit = softpipe->fs_variant->stipple_sampler_unit;
+
+      assert(unit >= softpipe->num_fragment_samplers);
+
+      /* sampler state */
+      softpipe->fragment_samplers[unit] = softpipe->pstipple.sampler;
+
+      /* sampler view */
+      pipe_sampler_view_reference(&softpipe->fragment_sampler_views[unit],
+                                  softpipe->pstipple.sampler_view);
+
+      sp_tex_tile_cache_set_sampler_view(softpipe->fragment_tex_cache[unit],
+                                         softpipe->pstipple.sampler_view);
+
+      softpipe->dirty |= SP_NEW_SAMPLER;
+   }
+}
+
+
 /* Hopefully this will remain quite simple, otherwise need to pull in
  * something like the state tracker mechanism.
  */
 void
-softpipe_update_derived(struct softpipe_context *softpipe)
+softpipe_update_derived(struct softpipe_context *softpipe, unsigned prim)
 {
    struct softpipe_screen *sp_screen = softpipe_screen(softpipe->pipe.screen);
 
@@ -290,10 +347,23 @@ softpipe_update_derived(struct softpipe_context *softpipe)
       softpipe->tex_timestamp = sp_screen->timestamp;
       softpipe->dirty |= SP_NEW_TEXTURE;
    }
-      
+
+#if DO_PSTIPPLE_IN_HELPER_MODULE
+   if (softpipe->dirty & SP_NEW_STIPPLE)
+      /* before updating samplers! */
+      update_polygon_stipple_pattern(softpipe);
+#endif
+
    if (softpipe->dirty & (SP_NEW_RASTERIZER |
                           SP_NEW_FS))
-      update_fragment_shader(softpipe);
+      update_fragment_shader(softpipe, prim);
+
+#if DO_PSTIPPLE_IN_HELPER_MODULE
+   if (softpipe->dirty & (SP_NEW_RASTERIZER |
+                          SP_NEW_STIPPLE |
+                          SP_NEW_FS))
+      update_polygon_stipple_enable(softpipe, prim);
+#endif
 
    if (softpipe->dirty & (SP_NEW_SAMPLER |
                           SP_NEW_TEXTURE |