gallium/draw: use correct rasterization state for wide/AA points/lines

When points or lines are decomposed into triangles, we need to be sure
to disable polygon culling, stippling, "un-filled" modes, etc.

This patch sets the rasterization state to disable those things prior to
drawing points/lines with triangles, then restores the previous state
afterward.

The new piglit point-no-line-cull test checks this problem & solution.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
index fdabce7d44..d6d7513e2a 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
@@ -52,6 +52,7 @@
  */
 
 
+#include "pipe/p_context.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
 #include "pipe/p_defines.h"
@@ -213,6 +214,9 @@ static void widepoint_first_point( struct draw_stage *stage,
 {
    struct widepoint_stage *wide = widepoint_stage(stage);
    struct draw_context *draw = stage->draw;
+   struct pipe_context *pipe = draw->pipe;
+   const struct pipe_rasterizer_state *rast = draw->rasterizer;
+   void *r;
 
    wide->half_point_size = 0.5f * draw->rasterizer->point_size;
    wide->xbias = 0.0;
@@ -222,6 +226,12 @@ static void widepoint_first_point( struct draw_stage *stage,
       wide->xbias = 0.125;
    }
 
+   /* Disable triangle culling, stippling, unfilled mode etc. */
+   r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
+   draw->suspend_flushing = TRUE;
+   pipe->bind_rasterizer_state(pipe, r);
+   draw->suspend_flushing = FALSE;
+
    /* XXX we won't know the real size if it's computed by the vertex shader! */
    if ((draw->rasterizer->point_size > draw->pipeline.wide_point_threshold) ||
        (draw->rasterizer->sprite_coord_enable && draw->pipeline.point_sprite)) {
@@ -277,9 +287,19 @@ static void widepoint_first_point( struct draw_stage *stage,
 
 static void widepoint_flush( struct draw_stage *stage, unsigned flags )
 {
+   struct draw_context *draw = stage->draw;
+   struct pipe_context *pipe = draw->pipe;
+
    stage->point = widepoint_first_point;
    stage->next->flush( stage->next, flags );
    stage->draw->extra_shader_outputs.slot = 0;
+
+   /* restore original rasterizer state */
+   if (draw->rast_handle) {
+      draw->suspend_flushing = TRUE;
+      pipe->bind_rasterizer_state(pipe, draw->rast_handle);
+      draw->suspend_flushing = FALSE;
+   }
 }