Mesa (master): turnip: add missing register write to disable dithering

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Module: Mesa
Branch: master
Commit: dd388b14c8d5f0bcb0004fc1382846f42b8ece9b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=dd388b14c8d5f0bcb0004fc1382846f42b8ece9b

Author: Jonathan Marek <jonathan at marek.ca>
Date:   Mon Jan 25 22:08:57 2021 -0500

turnip: add missing register write to disable dithering

This was causing rendering issues with low precision formats because GL
driver can enable it.

Signed-off-by: Jonathan Marek <jonathan at marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8707>

---

 src/freedreno/vulkan/tu_cmd_buffer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/freedreno/vulkan/tu_cmd_buffer.c b/src/freedreno/vulkan/tu_cmd_buffer.c
index 2c3be12104e..672122af2fd 100644
--- a/src/freedreno/vulkan/tu_cmd_buffer.c
+++ b/src/freedreno/vulkan/tu_cmd_buffer.c
@@ -803,7 +803,8 @@ tu6_init_hw(struct tu_cmd_buffer *cmd, struct tu_cs *cs)
 
    tu_cs_emit_write_reg(cs, REG_A6XX_PC_MODE_CNTL, 0x0000001f);
 
-   tu_cs_emit_regs(cs, A6XX_RB_ALPHA_CONTROL());
+   tu_cs_emit_regs(cs, A6XX_RB_ALPHA_CONTROL()); /* always disable alpha test */
+   tu_cs_emit_regs(cs, A6XX_RB_DITHER_CNTL()); /* always disable dithering */
 
    tu_disable_draw_states(cmd, cs);