gallium: introduce PIPE_CAP_CLIP_HALFZ.

In preparation of ARB_clip_control. Let the driver decide if
it supports pipe_rasterizer_state::clip_halfz being set to true.

v3:
Initially enable on ilo.

Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Signed-off-by: Mathias Froehlich <[email protected]

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index ad716b70ca5..cec0fcbf23b 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -277,6 +277,8 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    }
    case PIPE_CAP_UMA:
       return 0;
+   case PIPE_CAP_CLIP_HALFZ:
+      return 1;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);