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drm/radeon/kms: allow rendering while no colorbuffer is set on r300

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Because hardware cannot disable all colorbuffers directly to do depth-only
rendering, a user should:
- disable reading from a colorbuffer in blending
- disable fastfill
- set the color channel mask to 0 to prevent writing to a colorbuffer

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Marek Olšák
2009-12-17 06:02:28 +01:00
committed by Dave Airlie
parent 5ea597f376
commit 46c64d4bfa
3 changed files with 19 additions and 1 deletions
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12
drivers/gpu/drm/radeon/r300.c
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@@ -992,6 +992,18 @@ static int r300_packet0_check(struct radeon_cs_parser *p,
}
ib[idx] = idx_value + ((u32)reloc->lobj.gpu_offset);
break;
case 0x4e0c:
/* RB3D_COLOR_CHANNEL_MASK */
track->color_channel_mask = idx_value;
break;
case 0x4d1c:
/* ZB_BW_CNTL */
track->fastfill = !!(idx_value & (1 << 2));
break;
case 0x4e04:
/* RB3D_BLENDCNTL */
track->blend_read_enable = !!(idx_value & (1 << 2));
break;
case 0x4be8:
/* valid register only on RV530 */
if (p->rdev->family == CHIP_RV530)