From 4d0d9118756325ea83d254515d4c7a410df96f0e Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Sun, 24 Jun 2018 22:10:28 +0200
Subject: [PATCH] nouveau: fix 3D blitter for unsigned to signed integer
 conversions

fixes a couple of packed_pixel CTS tests. No regressions inside a CTS run.

v2: simplify the changes a bit

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
---
 src/gallium/drivers/nouveau/nv50/nv50_blit.h  | 21 ++++++++++---------
 .../drivers/nouveau/nv50/nv50_surface.c       | 11 ++++++++++
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nv50/nv50_blit.h b/src/gallium/drivers/nouveau/nv50/nv50_blit.h
index 10fe5274b10..01667bb5f66 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_blit.h
+++ b/src/gallium/drivers/nouveau/nv50/nv50_blit.h
@@ -17,16 +17,17 @@ nv50_blit_select_mode(const struct pipe_blit_info *);
 void
 nv50_resource_resolve(struct pipe_context *, const struct pipe_resolve_info *);
 
-#define NV50_BLIT_MODE_PASS  0 /* pass through TEX $t0/$s0 output */
-#define NV50_BLIT_MODE_Z24S8 1 /* encode ZS values for RGBA unorm8 */
-#define NV50_BLIT_MODE_S8Z24 2
-#define NV50_BLIT_MODE_X24S8 3
-#define NV50_BLIT_MODE_S8X24 4
-#define NV50_BLIT_MODE_Z24X8 5
-#define NV50_BLIT_MODE_X8Z24 6
-#define NV50_BLIT_MODE_ZS    7 /* put $t0/$s0 into R, $t1/$s1 into G */
-#define NV50_BLIT_MODE_XS    8 /* put $t1/$s1 into G */
-#define NV50_BLIT_MODES      9
+#define NV50_BLIT_MODE_PASS       0 /* pass through TEX $t0/$s0 output */
+#define NV50_BLIT_MODE_Z24S8      1 /* encode ZS values for RGBA unorm8 */
+#define NV50_BLIT_MODE_S8Z24      2
+#define NV50_BLIT_MODE_X24S8      3
+#define NV50_BLIT_MODE_S8X24      4
+#define NV50_BLIT_MODE_Z24X8      5
+#define NV50_BLIT_MODE_X8Z24      6
+#define NV50_BLIT_MODE_ZS         7 /* put $t0/$s0 into R, $t1/$s1 into G */
+#define NV50_BLIT_MODE_XS         8 /* put $t1/$s1 into G */
+#define NV50_BLIT_MODE_INT_CLAMP  9 /* unsigned to signed integer conversion */
+#define NV50_BLIT_MODES          10
 
 /* CUBE and RECT textures are reinterpreted as 2D(_ARRAY) */
 #define NV50_BLIT_TEXTURE_BUFFER    0
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_surface.c b/src/gallium/drivers/nouveau/nv50/nv50_surface.c
index 037e14a4d60..1ef0f5030a5 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_surface.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_surface.c
@@ -892,6 +892,10 @@ nv50_blitter_make_fp(struct pipe_context *pipe,
    bool tex_s = false;
    bool cvt_un8 = false;
 
+   bool int_clamp = mode == NV50_BLIT_MODE_INT_CLAMP;
+   if (int_clamp)
+      mode = NV50_BLIT_MODE_PASS;
+
    if (mode != NV50_BLIT_MODE_PASS &&
        mode != NV50_BLIT_MODE_Z24X8 &&
        mode != NV50_BLIT_MODE_X8Z24)
@@ -936,6 +940,10 @@ nv50_blitter_make_fp(struct pipe_context *pipe,
                target, tc, ureg_DECL_sampler(ureg, 0));
    }
 
+   /* handle signed to unsigned integer conversions */
+   if (int_clamp)
+      ureg_UMIN(ureg, data, ureg_src(data), ureg_imm1u(ureg, 0x7fffffff));
+
    if (cvt_un8) {
       struct ureg_src mask;
       struct ureg_src scale;
@@ -1058,6 +1066,9 @@ nv50_blit_select_mode(const struct pipe_blit_info *info)
          return NV50_BLIT_MODE_XS;
       }
    default:
+      if (util_format_is_pure_uint(info->src.format) &&
+          util_format_is_pure_sint(info->dst.format))
+         return NV50_BLIT_MODE_INT_CLAMP;
       return NV50_BLIT_MODE_PASS;
    }
 }
-- 
2.30.2