Mesa (gallium-0.1): gallium: added draw_set_mrd() function to fix polygon offset

[Brian Paul]

Module: Mesa
Branch: gallium-0.1
Commit: d0bc5293d6e1e9c34fa822b7c2928932ed22462c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d0bc5293d6e1e9c34fa822b7c2928932ed22462c

Author: Brian Paul <brian.paul at tungstengraphics.com>
Date:   Wed Dec 10 18:02:27 2008 -0700

gallium: added draw_set_mrd() function to fix polygon offset

The Minimum Resolvable Depth factor depends on the driver and can't just
be computed from the number of Z buffer bits.
Glean's polygon offset test now passes with softpipe.
Still need to determine the MRD factor for other gallium drivers, if they use
the draw module's polygon offset stage...

---

 src/gallium/auxiliary/draw/draw_context.c       |   12 ++++++++++++
 src/gallium/auxiliary/draw/draw_context.h       |    1 +
 src/gallium/auxiliary/draw/draw_pipe_offset.c   |    3 +--
 src/gallium/auxiliary/draw/draw_private.h       |    2 ++
 src/gallium/drivers/softpipe/sp_state_surface.c |   20 ++++++++++++++++++++
 5 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index 74deb44..fab8fc9 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -103,6 +103,18 @@ void draw_flush( struct draw_context *draw )
 }
 
 
+/**
+ * Specify the Minimum Resolvable Depth factor for polygon offset.
+ * This factor potentially depends on the number of Z buffer bits,
+ * the rasterization algorithm and the arithmetic performed on Z
+ * values between vertex shading and rasterization.  It will vary
+ * from one driver to another.
+ */
+void draw_set_mrd(struct draw_context *draw, double mrd)
+{
+   draw->mrd = mrd;
+}
+
 
 /**
  * Register new primitive rasterization/rendering state.
diff --git a/src/gallium/auxiliary/draw/draw_context.h b/src/gallium/auxiliary/draw/draw_context.h
index 1d40c6c..a29bb01 100644
--- a/src/gallium/auxiliary/draw/draw_context.h
+++ b/src/gallium/auxiliary/draw/draw_context.h
@@ -72,6 +72,7 @@ void draw_enable_line_stipple(struct draw_context *draw, boolean enable);
 
 void draw_enable_point_sprites(struct draw_context *draw, boolean enable);
 
+void draw_set_mrd(struct draw_context *draw, double mrd);
 
 boolean
 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe);
diff --git a/src/gallium/auxiliary/draw/draw_pipe_offset.c b/src/gallium/auxiliary/draw/draw_pipe_offset.c
index 1fea5e6..8ddc4ee 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_offset.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_offset.c
@@ -122,9 +122,8 @@ static void offset_first_tri( struct draw_stage *stage,
 			      struct prim_header *header )
 {
    struct offset_stage *offset = offset_stage(stage);
-   float mrd = 1.0f / 65535.0f; /* XXX this depends on depthbuffer bits! */
 
-   offset->units = stage->draw->rasterizer->offset_units * mrd;
+   offset->units = stage->draw->rasterizer->offset_units * stage->draw->mrd;
    offset->scale = stage->draw->rasterizer->offset_scale;
 
    stage->tri = offset_tri;
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 37c4c87..a16b45d 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -172,6 +172,8 @@ struct draw_context
 
    boolean force_passthrough; /**< never clip or shade */
 
+   double mrd;  /**< minimum resolvable depth value, for polygon offset */
+
    /* pipe state that we need: */
    const struct pipe_rasterizer_state *rasterizer;
    struct pipe_viewport_state viewport;
diff --git a/src/gallium/drivers/softpipe/sp_state_surface.c b/src/gallium/drivers/softpipe/sp_state_surface.c
index ba8c9ee..8877b18 100644
--- a/src/gallium/drivers/softpipe/sp_state_surface.c
+++ b/src/gallium/drivers/softpipe/sp_state_surface.c
@@ -101,6 +101,26 @@ softpipe_set_framebuffer_state(struct pipe_context *pipe,
    }
 #endif
 
+   /* Tell draw module how deep the Z/depth buffer is */
+   {
+      int depth_bits;
+      double mrd;
+      if (sp->framebuffer.zsbuf) {
+         depth_bits = pf_get_component_bits(sp->framebuffer.zsbuf->format,
+                                            PIPE_FORMAT_COMP_Z);
+      }
+      else {
+         depth_bits = 0;
+      }
+      if (depth_bits > 16) {
+         mrd = 0.0000001;
+      }
+      else {
+         mrd = 0.00002;
+      }
+      draw_set_mrd(sp->draw, mrd);
+   }
+
    sp->framebuffer.width = fb->width;
    sp->framebuffer.height = fb->height;