Mesa (master): r300g: remove any traces of depth_clamp

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 09109c11d9efd78c0f87fc55911e03eda5fd980b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=09109c11d9efd78c0f87fc55911e03eda5fd980b

Author: Marek Olšák <maraeo at gmail.com>
Date:   Mon Jan 24 13:29:19 2011 +0100

r300g: remove any traces of depth_clamp

I couldn't make it work.

GB_TILE_CONFIG.Z_EXTENDED, which enables per-pixel Z clamping, and
VAP_CLIP_CNTL.CLIP_DISABLE, which disables clipping, do help, but they
also add regressions like random graphics corruptions in some games.

---

 src/gallium/drivers/r300/r300_screen.c |    2 +-
 src/gallium/drivers/r300/r300_state.c  |    3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index a8ba9c1..880372e 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -121,7 +121,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_DUAL_SOURCE_BLEND:
         case PIPE_CAP_INDEP_BLEND_ENABLE:
         case PIPE_CAP_INDEP_BLEND_FUNC:
-        case PIPE_CAP_DEPTH_CLAMP: /* XXX implemented, but breaks Regnum Online */
+        case PIPE_CAP_DEPTH_CLAMP:
         case PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE:
         case PIPE_CAP_SHADER_STENCIL_EXPORT:
         case PIPE_CAP_STREAM_OUTPUT:
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index 3a97b76..2664c1d 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -442,8 +442,7 @@ static void r300_set_clip_state(struct pipe_context* pipe,
            OUT_CB_TABLE(state->ucp, state->nr * 4);
         }
         OUT_CB_REG(R300_VAP_CLIP_CNTL, ((1 << state->nr) - 1) |
-                R300_PS_UCP_MODE_CLIP_AS_TRIFAN |
-                (state->depth_clamp ? R300_CLIP_DISABLE : 0));
+                   R300_PS_UCP_MODE_CLIP_AS_TRIFAN);
         END_CB;
 
         r300_mark_atom_dirty(r300, &r300->clip_state);