From 49c3a3923b54c2aad224f52f6c648d0492642c93 Mon Sep 17 00:00:00 2001
From: Raph Levien <raph.levien@gmail.com>
Date: Tue, 7 Dec 2021 17:24:07 -0800
Subject: [PATCH] Restore gradients and clips

This changes gradients and clips to the new encoding. Lightly tested.
---
 piet-gpu/shader/drawtag.h            |   5 +-
 piet-gpu/shader/gen/draw_leaf.dxil   | Bin 6908 -> 6880 bytes
 piet-gpu/shader/gen/draw_leaf.hlsl   |  90 +++++++++++++--------------
 piet-gpu/shader/gen/draw_leaf.msl    |  31 +++++----
 piet-gpu/shader/gen/draw_leaf.spv    | Bin 38596 -> 38560 bytes
 piet-gpu/shader/gen/draw_reduce.dxil | Bin 3956 -> 3940 bytes
 piet-gpu/shader/gen/draw_reduce.hlsl |  30 ++++-----
 piet-gpu/shader/gen/draw_reduce.msl  |  11 ++--
 piet-gpu/shader/gen/draw_reduce.spv  | Bin 6908 -> 6872 bytes
 piet-gpu/src/encoder.rs              |  60 ++++++++++++++++++
 piet-gpu/src/render_ctx.rs           |  34 +++-------
 piet-gpu/src/text.rs                 |   3 +-
 12 files changed, 147 insertions(+), 117 deletions(-)

diff --git a/piet-gpu/shader/drawtag.h b/piet-gpu/shader/drawtag.h
index a9e8a1d..17105f6 100644
--- a/piet-gpu/shader/drawtag.h
+++ b/piet-gpu/shader/drawtag.h
@@ -26,9 +26,10 @@ DrawMonoid map_tag(uint tag_word) {
     case Element_FillImage:
         return DrawMonoid(1, 0);
     case Element_BeginClip:
-        return DrawMonoid(1, 1);
+    // TODO: endclip should be (0, 1), ie not generate a path. But for now
+    // we generate a dummy path.
     case Element_EndClip:
-        return DrawMonoid(0, 1);
+        return DrawMonoid(1, 1);
     default:
         return DrawMonoid(0, 0);
     }
diff --git a/piet-gpu/shader/gen/draw_leaf.dxil b/piet-gpu/shader/gen/draw_leaf.dxil
index f95e5bcfcdd97577ea4addb88b9a791740cf430c..86b37e940da57e098366edaadf2139a3bc786b49 100644
GIT binary patch
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diff --git a/piet-gpu/shader/gen/draw_leaf.hlsl b/piet-gpu/shader/gen/draw_leaf.hlsl
index 0dec2cd..e3cb387 100644
--- a/piet-gpu/shader/gen/draw_leaf.hlsl
+++ b/piet-gpu/shader/gen/draw_leaf.hlsl
@@ -154,14 +154,13 @@ struct Config
 static const uint3 gl_WorkGroupSize = uint3(512u, 1u, 1u);
 
 static const DrawMonoid _418 = { 0u, 0u };
-static const DrawMonoid _443 = { 1u, 0u };
-static const DrawMonoid _445 = { 1u, 1u };
-static const DrawMonoid _447 = { 0u, 1u };
+static const DrawMonoid _442 = { 1u, 0u };
+static const DrawMonoid _444 = { 1u, 1u };
 
 RWByteAddressBuffer _201 : register(u0, space0);
 ByteAddressBuffer _225 : register(t2, space0);
-ByteAddressBuffer _1008 : register(t3, space0);
-ByteAddressBuffer _1042 : register(t1, space0);
+ByteAddressBuffer _1005 : register(t3, space0);
+ByteAddressBuffer _1039 : register(t1, space0);
 
 static uint3 gl_WorkGroupID;
 static uint3 gl_LocalInvocationID;
@@ -190,15 +189,12 @@ DrawMonoid map_tag(uint tag_word)
         case 5u:
         case 6u:
         {
-            return _443;
+            return _442;
         }
         case 9u:
-        {
-            return _445;
-        }
         case 10u:
         {
-            return _447;
+            return _444;
         }
         default:
         {
@@ -293,9 +289,9 @@ void Annotated_Color_write(Alloc a, AnnotatedRef ref, uint flags, AnnoColor s)
     uint param_1 = ref.offset >> uint(2);
     uint param_2 = (flags << uint(16)) | 1u;
     write_mem(param, param_1, param_2);
-    AnnoColorRef _808 = { ref.offset + 4u };
+    AnnoColorRef _805 = { ref.offset + 4u };
     Alloc param_3 = a;
-    AnnoColorRef param_4 = _808;
+    AnnoColorRef param_4 = _805;
     AnnoColor param_5 = s;
     AnnoColor_write(param_3, param_4, param_5);
 }
@@ -369,9 +365,9 @@ void Annotated_LinGradient_write(Alloc a, AnnotatedRef ref, uint flags, AnnoLinG
     uint param_1 = ref.offset >> uint(2);
     uint param_2 = (flags << uint(16)) | 2u;
     write_mem(param, param_1, param_2);
-    AnnoLinGradientRef _829 = { ref.offset + 4u };
+    AnnoLinGradientRef _826 = { ref.offset + 4u };
     Alloc param_3 = a;
-    AnnoLinGradientRef param_4 = _829;
+    AnnoLinGradientRef param_4 = _826;
     AnnoLinGradient param_5 = s;
     AnnoLinGradient_write(param_3, param_4, param_5);
 }
@@ -433,9 +429,9 @@ void Annotated_Image_write(Alloc a, AnnotatedRef ref, uint flags, AnnoImage s)
     uint param_1 = ref.offset >> uint(2);
     uint param_2 = (flags << uint(16)) | 3u;
     write_mem(param, param_1, param_2);
-    AnnoImageRef _850 = { ref.offset + 4u };
+    AnnoImageRef _847 = { ref.offset + 4u };
     Alloc param_3 = a;
-    AnnoImageRef param_4 = _850;
+    AnnoImageRef param_4 = _847;
     AnnoImage param_5 = s;
     AnnoImage_write(param_3, param_4, param_5);
 }
@@ -490,9 +486,9 @@ void Annotated_BeginClip_write(Alloc a, AnnotatedRef ref, uint flags, AnnoBeginC
     uint param_1 = ref.offset >> uint(2);
     uint param_2 = (flags << uint(16)) | 4u;
     write_mem(param, param_1, param_2);
-    AnnoBeginClipRef _871 = { ref.offset + 4u };
+    AnnoBeginClipRef _868 = { ref.offset + 4u };
     Alloc param_3 = a;
-    AnnoBeginClipRef param_4 = _871;
+    AnnoBeginClipRef param_4 = _868;
     AnnoBeginClip param_5 = s;
     AnnoBeginClip_write(param_3, param_4, param_5);
 }
@@ -531,9 +527,9 @@ void Annotated_EndClip_write(Alloc a, AnnotatedRef ref, AnnoEndClip s)
     uint param_1 = ref.offset >> uint(2);
     uint param_2 = 5u;
     write_mem(param, param_1, param_2);
-    AnnoEndClipRef _889 = { ref.offset + 4u };
+    AnnoEndClipRef _886 = { ref.offset + 4u };
     Alloc param_3 = a;
-    AnnoEndClipRef param_4 = _889;
+    AnnoEndClipRef param_4 = _886;
     AnnoEndClip param_5 = s;
     AnnoEndClip_write(param_3, param_4, param_5);
 }
@@ -541,8 +537,8 @@ void Annotated_EndClip_write(Alloc a, AnnotatedRef ref, AnnoEndClip s)
 void comp_main()
 {
     uint ix = gl_GlobalInvocationID.x * 8u;
-    ElementRef _907 = { ix * 36u };
-    ElementRef ref = _907;
+    ElementRef _904 = { ix * 36u };
+    ElementRef ref = _904;
     ElementRef param = ref;
     uint tag_word = Element_tag(param).tag;
     uint param_1 = tag_word;
@@ -579,11 +575,11 @@ void comp_main()
     DrawMonoid row = tag_monoid_identity();
     if (gl_WorkGroupID.x > 0u)
     {
-        DrawMonoid _1014;
-        _1014.path_ix = _1008.Load((gl_WorkGroupID.x - 1u) * 8 + 0);
-        _1014.clip_ix = _1008.Load((gl_WorkGroupID.x - 1u) * 8 + 4);
-        row.path_ix = _1014.path_ix;
-        row.clip_ix = _1014.clip_ix;
+        DrawMonoid _1011;
+        _1011.path_ix = _1005.Load((gl_WorkGroupID.x - 1u) * 8 + 0);
+        _1011.clip_ix = _1005.Load((gl_WorkGroupID.x - 1u) * 8 + 4);
+        row.path_ix = _1011.path_ix;
+        row.clip_ix = _1011.clip_ix;
     }
     if (gl_LocalInvocationID.x > 0u)
     {
@@ -592,9 +588,9 @@ void comp_main()
         row = combine_tag_monoid(param_10, param_11);
     }
     uint out_ix = gl_GlobalInvocationID.x * 8u;
-    uint out_base = (_1042.Load(44) >> uint(2)) + (out_ix * 2u);
-    AnnotatedRef _1058 = { _1042.Load(32) + (out_ix * 40u) };
-    AnnotatedRef out_ref = _1058;
+    uint out_base = (_1039.Load(44) >> uint(2)) + (out_ix * 2u);
+    AnnotatedRef _1055 = { _1039.Load(32) + (out_ix * 40u) };
+    AnnotatedRef out_ref = _1055;
     float4 mat;
     float2 translate;
     AnnoColor anno_fill;
@@ -621,7 +617,7 @@ void comp_main()
         tag_word = Element_tag(param_16).tag;
         if (((tag_word == 4u) || (tag_word == 5u)) || (tag_word == 6u))
         {
-            uint bbox_offset = (_1042.Load(40) >> uint(2)) + (6u * (m.path_ix - 1u));
+            uint bbox_offset = (_1039.Load(40) >> uint(2)) + (6u * (m.path_ix - 1u));
             float bbox_l = float(_201.Load(bbox_offset * 4 + 8)) - 32768.0f;
             float bbox_t = float(_201.Load((bbox_offset + 1u) * 4 + 8)) - 32768.0f;
             float bbox_r = float(_201.Load((bbox_offset + 2u) * 4 + 8)) - 32768.0f;
@@ -632,7 +628,7 @@ void comp_main()
             if ((linewidth >= 0.0f) || (tag_word == 5u))
             {
                 uint trans_ix = _201.Load((bbox_offset + 5u) * 4 + 8);
-                uint t = (_1042.Load(36) >> uint(2)) + (6u * trans_ix);
+                uint t = (_1039.Load(36) >> uint(2)) + (6u * trans_ix);
                 mat = asfloat(uint4(_201.Load(t * 4 + 8), _201.Load((t + 1u) * 4 + 8), _201.Load((t + 2u) * 4 + 8), _201.Load((t + 3u) * 4 + 8)));
                 if (tag_word == 5u)
                 {
@@ -653,9 +649,9 @@ void comp_main()
                     anno_fill.bbox = bbox;
                     anno_fill.linewidth = linewidth;
                     anno_fill.rgba_color = fill.rgba_color;
-                    Alloc _1261;
-                    _1261.offset = _1042.Load(32);
-                    param_18.offset = _1261.offset;
+                    Alloc _1258;
+                    _1258.offset = _1039.Load(32);
+                    param_18.offset = _1258.offset;
                     AnnotatedRef param_19 = out_ref;
                     uint param_20 = fill_mode;
                     AnnoColor param_21 = anno_fill;
@@ -678,9 +674,9 @@ void comp_main()
                     anno_lin.line_x = line_x;
                     anno_lin.line_y = line_y;
                     anno_lin.line_c = -((p0.x * line_x) + (p0.y * line_y));
-                    Alloc _1357;
-                    _1357.offset = _1042.Load(32);
-                    param_23.offset = _1357.offset;
+                    Alloc _1354;
+                    _1354.offset = _1039.Load(32);
+                    param_23.offset = _1354.offset;
                     AnnotatedRef param_24 = out_ref;
                     uint param_25 = fill_mode;
                     AnnoLinGradient param_26 = anno_lin;
@@ -695,9 +691,9 @@ void comp_main()
                     anno_img.linewidth = linewidth;
                     anno_img.index = fill_img.index;
                     anno_img.offset = fill_img.offset;
-                    Alloc _1385;
-                    _1385.offset = _1042.Load(32);
-                    param_28.offset = _1385.offset;
+                    Alloc _1382;
+                    _1382.offset = _1039.Load(32);
+                    param_28.offset = _1382.offset;
                     AnnotatedRef param_29 = out_ref;
                     uint param_30 = fill_mode;
                     AnnoImage param_31 = anno_img;
@@ -714,9 +710,9 @@ void comp_main()
                 Clip begin_clip = Element_BeginClip_read(param_32);
                 anno_begin_clip.bbox = begin_clip.bbox;
                 anno_begin_clip.linewidth = 0.0f;
-                Alloc _1413;
-                _1413.offset = _1042.Load(32);
-                param_33.offset = _1413.offset;
+                Alloc _1410;
+                _1410.offset = _1039.Load(32);
+                param_33.offset = _1410.offset;
                 AnnotatedRef param_34 = out_ref;
                 uint param_35 = 0u;
                 AnnoBeginClip param_36 = anno_begin_clip;
@@ -729,9 +725,9 @@ void comp_main()
                     ElementRef param_37 = this_ref;
                     Clip end_clip = Element_EndClip_read(param_37);
                     anno_end_clip.bbox = end_clip.bbox;
-                    Alloc _1438;
-                    _1438.offset = _1042.Load(32);
-                    param_38.offset = _1438.offset;
+                    Alloc _1435;
+                    _1435.offset = _1039.Load(32);
+                    param_38.offset = _1435.offset;
                     AnnotatedRef param_39 = out_ref;
                     AnnoEndClip param_40 = anno_end_clip;
                     Annotated_EndClip_write(param_38, param_39, param_40);
diff --git a/piet-gpu/shader/gen/draw_leaf.msl b/piet-gpu/shader/gen/draw_leaf.msl
index f713186..e20fcb2 100644
--- a/piet-gpu/shader/gen/draw_leaf.msl
+++ b/piet-gpu/shader/gen/draw_leaf.msl
@@ -251,12 +251,9 @@ DrawMonoid map_tag(thread const uint& tag_word)
             return DrawMonoid{ 1u, 0u };
         }
         case 9u:
-        {
-            return DrawMonoid{ 1u, 1u };
-        }
         case 10u:
         {
-            return DrawMonoid{ 0u, 1u };
+            return DrawMonoid{ 1u, 1u };
         }
         default:
         {
@@ -609,7 +606,7 @@ void Annotated_EndClip_write(thread const Alloc& a, thread const AnnotatedRef& r
     AnnoEndClip_write(param_3, param_4, param_5, v_201);
 }
 
-kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1042 [[buffer(1)]], const device SceneBuf& v_225 [[buffer(2)]], const device ParentBuf& _1008 [[buffer(3)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], uint3 gl_LocalInvocationID [[thread_position_in_threadgroup]], uint3 gl_WorkGroupID [[threadgroup_position_in_grid]])
+kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1039 [[buffer(1)]], const device SceneBuf& v_225 [[buffer(2)]], const device ParentBuf& _1005 [[buffer(3)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], uint3 gl_LocalInvocationID [[thread_position_in_threadgroup]], uint3 gl_WorkGroupID [[threadgroup_position_in_grid]])
 {
     threadgroup DrawMonoid sh_scratch[512];
     uint ix = gl_GlobalInvocationID.x * 8u;
@@ -650,9 +647,9 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
     DrawMonoid row = tag_monoid_identity();
     if (gl_WorkGroupID.x > 0u)
     {
-        uint _1011 = gl_WorkGroupID.x - 1u;
-        row.path_ix = _1008.parent[_1011].path_ix;
-        row.clip_ix = _1008.parent[_1011].clip_ix;
+        uint _1008 = gl_WorkGroupID.x - 1u;
+        row.path_ix = _1005.parent[_1008].path_ix;
+        row.clip_ix = _1005.parent[_1008].clip_ix;
     }
     if (gl_LocalInvocationID.x > 0u)
     {
@@ -661,8 +658,8 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
         row = combine_tag_monoid(param_10, param_11);
     }
     uint out_ix = gl_GlobalInvocationID.x * 8u;
-    uint out_base = (_1042.conf.drawmonoid_alloc.offset >> uint(2)) + (out_ix * 2u);
-    AnnotatedRef out_ref = AnnotatedRef{ _1042.conf.anno_alloc.offset + (out_ix * 40u) };
+    uint out_base = (_1039.conf.drawmonoid_alloc.offset >> uint(2)) + (out_ix * 2u);
+    AnnotatedRef out_ref = AnnotatedRef{ _1039.conf.anno_alloc.offset + (out_ix * 40u) };
     float4 mat;
     float2 translate;
     AnnoColor anno_fill;
@@ -689,7 +686,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
         tag_word = Element_tag(param_16, v_225).tag;
         if (((tag_word == 4u) || (tag_word == 5u)) || (tag_word == 6u))
         {
-            uint bbox_offset = (_1042.conf.bbox_alloc.offset >> uint(2)) + (6u * (m.path_ix - 1u));
+            uint bbox_offset = (_1039.conf.bbox_alloc.offset >> uint(2)) + (6u * (m.path_ix - 1u));
             float bbox_l = float(v_201.memory[bbox_offset]) - 32768.0;
             float bbox_t = float(v_201.memory[bbox_offset + 1u]) - 32768.0;
             float bbox_r = float(v_201.memory[bbox_offset + 2u]) - 32768.0;
@@ -700,7 +697,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
             if ((linewidth >= 0.0) || (tag_word == 5u))
             {
                 uint trans_ix = v_201.memory[bbox_offset + 5u];
-                uint t = (_1042.conf.trans_alloc.offset >> uint(2)) + (6u * trans_ix);
+                uint t = (_1039.conf.trans_alloc.offset >> uint(2)) + (6u * trans_ix);
                 mat = as_type<float4>(uint4(v_201.memory[t], v_201.memory[t + 1u], v_201.memory[t + 2u], v_201.memory[t + 3u]));
                 if (tag_word == 5u)
                 {
@@ -721,7 +718,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
                     anno_fill.bbox = bbox;
                     anno_fill.linewidth = linewidth;
                     anno_fill.rgba_color = fill.rgba_color;
-                    param_18.offset = _1042.conf.anno_alloc.offset;
+                    param_18.offset = _1039.conf.anno_alloc.offset;
                     AnnotatedRef param_19 = out_ref;
                     uint param_20 = fill_mode;
                     AnnoColor param_21 = anno_fill;
@@ -744,7 +741,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
                     anno_lin.line_x = line_x;
                     anno_lin.line_y = line_y;
                     anno_lin.line_c = -((p0.x * line_x) + (p0.y * line_y));
-                    param_23.offset = _1042.conf.anno_alloc.offset;
+                    param_23.offset = _1039.conf.anno_alloc.offset;
                     AnnotatedRef param_24 = out_ref;
                     uint param_25 = fill_mode;
                     AnnoLinGradient param_26 = anno_lin;
@@ -759,7 +756,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
                     anno_img.linewidth = linewidth;
                     anno_img.index = fill_img.index;
                     anno_img.offset = fill_img.offset;
-                    param_28.offset = _1042.conf.anno_alloc.offset;
+                    param_28.offset = _1039.conf.anno_alloc.offset;
                     AnnotatedRef param_29 = out_ref;
                     uint param_30 = fill_mode;
                     AnnoImage param_31 = anno_img;
@@ -776,7 +773,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
                 Clip begin_clip = Element_BeginClip_read(param_32, v_225);
                 anno_begin_clip.bbox = begin_clip.bbox;
                 anno_begin_clip.linewidth = 0.0;
-                param_33.offset = _1042.conf.anno_alloc.offset;
+                param_33.offset = _1039.conf.anno_alloc.offset;
                 AnnotatedRef param_34 = out_ref;
                 uint param_35 = 0u;
                 AnnoBeginClip param_36 = anno_begin_clip;
@@ -789,7 +786,7 @@ kernel void main0(device Memory& v_201 [[buffer(0)]], const device ConfigBuf& _1
                     ElementRef param_37 = this_ref;
                     Clip end_clip = Element_EndClip_read(param_37, v_225);
                     anno_end_clip.bbox = end_clip.bbox;
-                    param_38.offset = _1042.conf.anno_alloc.offset;
+                    param_38.offset = _1039.conf.anno_alloc.offset;
                     AnnotatedRef param_39 = out_ref;
                     AnnoEndClip param_40 = anno_end_clip;
                     Annotated_EndClip_write(param_38, param_39, param_40, v_201);
diff --git a/piet-gpu/shader/gen/draw_leaf.spv b/piet-gpu/shader/gen/draw_leaf.spv
index 8fade688ab936b660e7d9aebe2ffcf337a1d4484..77ed9cf929bbf122674f3cbc92726f53b8616491 100644
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index f1e48e1659e60f7d22e6af4278883153380e2f63..c001e896f2b6b3aad03bd517ce94c82d200bb760 100644
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diff --git a/piet-gpu/shader/gen/draw_reduce.hlsl b/piet-gpu/shader/gen/draw_reduce.hlsl
index 216d923..e56ec3d 100644
--- a/piet-gpu/shader/gen/draw_reduce.hlsl
+++ b/piet-gpu/shader/gen/draw_reduce.hlsl
@@ -44,15 +44,14 @@ struct Config
     uint pathseg_offset;
 };
 
-static const DrawMonoid _88 = { 1u, 0u };
-static const DrawMonoid _90 = { 1u, 1u };
-static const DrawMonoid _92 = { 0u, 1u };
-static const DrawMonoid _94 = { 0u, 0u };
+static const DrawMonoid _87 = { 1u, 0u };
+static const DrawMonoid _89 = { 1u, 1u };
+static const DrawMonoid _91 = { 0u, 0u };
 
 ByteAddressBuffer _46 : register(t2, space0);
-RWByteAddressBuffer _203 : register(u3, space0);
-RWByteAddressBuffer _217 : register(u0, space0);
-ByteAddressBuffer _223 : register(t1, space0);
+RWByteAddressBuffer _200 : register(u3, space0);
+RWByteAddressBuffer _214 : register(u0, space0);
+ByteAddressBuffer _220 : register(t1, space0);
 
 static uint3 gl_WorkGroupID;
 static uint3 gl_LocalInvocationID;
@@ -81,19 +80,16 @@ DrawMonoid map_tag(uint tag_word)
         case 5u:
         case 6u:
         {
-            return _88;
+            return _87;
         }
         case 9u:
-        {
-            return _90;
-        }
         case 10u:
         {
-            return _92;
+            return _89;
         }
         default:
         {
-            return _94;
+            return _91;
         }
     }
 }
@@ -115,8 +111,8 @@ DrawMonoid combine_tag_monoid(DrawMonoid a, DrawMonoid b)
 void comp_main()
 {
     uint ix = gl_GlobalInvocationID.x * 8u;
-    ElementRef _110 = { ix * 36u };
-    ElementRef ref = _110;
+    ElementRef _107 = { ix * 36u };
+    ElementRef ref = _107;
     ElementRef param = ref;
     uint tag_word = Element_tag(param).tag;
     uint param_1 = tag_word;
@@ -148,8 +144,8 @@ void comp_main()
     }
     if (gl_LocalInvocationID.x == 0u)
     {
-        _203.Store(gl_WorkGroupID.x * 8 + 0, agg.path_ix);
-        _203.Store(gl_WorkGroupID.x * 8 + 4, agg.clip_ix);
+        _200.Store(gl_WorkGroupID.x * 8 + 0, agg.path_ix);
+        _200.Store(gl_WorkGroupID.x * 8 + 4, agg.clip_ix);
     }
 }
 
diff --git a/piet-gpu/shader/gen/draw_reduce.msl b/piet-gpu/shader/gen/draw_reduce.msl
index 550cf8c..26a8793 100644
--- a/piet-gpu/shader/gen/draw_reduce.msl
+++ b/piet-gpu/shader/gen/draw_reduce.msl
@@ -98,12 +98,9 @@ DrawMonoid map_tag(thread const uint& tag_word)
             return DrawMonoid{ 1u, 0u };
         }
         case 9u:
-        {
-            return DrawMonoid{ 1u, 1u };
-        }
         case 10u:
         {
-            return DrawMonoid{ 0u, 1u };
+            return DrawMonoid{ 1u, 1u };
         }
         default:
         {
@@ -127,7 +124,7 @@ DrawMonoid combine_tag_monoid(thread const DrawMonoid& a, thread const DrawMonoi
     return c;
 }
 
-kernel void main0(const device SceneBuf& v_46 [[buffer(2)]], device OutBuf& _203 [[buffer(3)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], uint3 gl_LocalInvocationID [[thread_position_in_threadgroup]], uint3 gl_WorkGroupID [[threadgroup_position_in_grid]])
+kernel void main0(const device SceneBuf& v_46 [[buffer(2)]], device OutBuf& _200 [[buffer(3)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], uint3 gl_LocalInvocationID [[thread_position_in_threadgroup]], uint3 gl_WorkGroupID [[threadgroup_position_in_grid]])
 {
     threadgroup DrawMonoid sh_scratch[512];
     uint ix = gl_GlobalInvocationID.x * 8u;
@@ -163,8 +160,8 @@ kernel void main0(const device SceneBuf& v_46 [[buffer(2)]], device OutBuf& _203
     }
     if (gl_LocalInvocationID.x == 0u)
     {
-        _203.outbuf[gl_WorkGroupID.x].path_ix = agg.path_ix;
-        _203.outbuf[gl_WorkGroupID.x].clip_ix = agg.clip_ix;
+        _200.outbuf[gl_WorkGroupID.x].path_ix = agg.path_ix;
+        _200.outbuf[gl_WorkGroupID.x].clip_ix = agg.clip_ix;
     }
 }
 
diff --git a/piet-gpu/shader/gen/draw_reduce.spv b/piet-gpu/shader/gen/draw_reduce.spv
index 02ebc5dd3dde42750026dc89ddb54cf9df6e77cb..73430c6a938744794d28695d8f82174c31aca249 100644
GIT binary patch
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diff --git a/piet-gpu/src/encoder.rs b/piet-gpu/src/encoder.rs
index 338c01c..fb32f26 100644
--- a/piet-gpu/src/encoder.rs
+++ b/piet-gpu/src/encoder.rs
@@ -62,6 +62,9 @@ const DRAWOBJ_PART_SIZE: usize = 4096;
 // Element struct in piet-gpu-types; that's pretty much going away.
 
 const ELEMENT_FILLCOLOR: u32 = 4;
+const ELEMENT_FILLLINGRADIENT: u32 = 5;
+const ELEMENT_BEGINCLIP: u32 = 9;
+const ELEMENT_ENDCLIP: u32 = 10;
 
 #[repr(C)]
 #[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
@@ -71,6 +74,24 @@ pub struct FillColor {
     padding: [u32; 7],
 }
 
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
+pub struct FillLinGradient {
+    tag: u32,
+    index: u32,
+    p0: [f32; 2],
+    p1: [f32; 2],
+    padding: [u32; 3],
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
+pub struct Clip {
+    tag: u32,
+    bbox: [f32; 4],
+    padding: [u32; 4],
+}
+
 impl Encoder {
     pub fn new() -> Encoder {
         Encoder {
@@ -116,6 +137,45 @@ impl Encoder {
         self.drawobj_stream.extend(bytemuck::bytes_of(&element));
     }
 
+    /// Encode a fill linear gradient draw object.
+    ///
+    /// This should be encoded after a path.
+    pub fn fill_lin_gradient(&mut self, index: u32, p0: [f32; 2], p1: [f32; 2]) {
+        let element = FillLinGradient {
+            tag: ELEMENT_FILLLINGRADIENT,
+            index,
+            p0,
+            p1,
+            ..Default::default()
+        };
+        self.drawobj_stream.extend(bytemuck::bytes_of(&element));
+    }
+
+    /// Start a clip and return a save point to be filled in later.
+    pub fn begin_clip(&mut self) -> usize {
+        let saved = self.drawobj_stream.len();
+        let element = Clip {
+            tag: ELEMENT_BEGINCLIP,
+            ..Default::default()
+        };
+        self.drawobj_stream.extend(bytemuck::bytes_of(&element));
+        saved
+    }
+
+    pub fn end_clip(&mut self, bbox: [f32; 4], save_point: usize) {
+        let element = Clip {
+            tag: ELEMENT_ENDCLIP,
+            bbox,
+            ..Default::default()
+        };
+        self.drawobj_stream[save_point + 4..save_point + 20]
+            .clone_from_slice(bytemuck::bytes_of(&bbox));
+        self.drawobj_stream.extend(bytemuck::bytes_of(&element));
+        // This is a dummy path, and will go away with the new clip impl.
+        self.tag_stream.push(0x10);
+        self.n_path += 1;
+    }
+
     /// Return a config for the element processing pipeline.
     ///
     /// This does not include further pipeline processing. Also returns the
diff --git a/piet-gpu/src/render_ctx.rs b/piet-gpu/src/render_ctx.rs
index 2c5ee73..31fbf9e 100644
--- a/piet-gpu/src/render_ctx.rs
+++ b/piet-gpu/src/render_ctx.rs
@@ -11,7 +11,7 @@ use piet::{
 
 use piet_gpu_hal::BufWrite;
 use piet_gpu_types::encoder::{Encode, Encoder};
-use piet_gpu_types::scene::{Clip, Element, FillLinGradient, SetFillMode};
+use piet_gpu_types::scene::{Element, SetFillMode};
 
 use crate::gradient::{LinearGradient, RampCache};
 use crate::text::Font;
@@ -64,8 +64,8 @@ struct State {
 }
 
 struct ClipElement {
-    /// Index of BeginClip element in element vec, for bbox fixup.
-    begin_ix: usize,
+    /// Byte offset of BeginClip element in element vec, for bbox fixup.
+    save_point: usize,
     bbox: Option<Rect>,
 }
 
@@ -242,21 +242,17 @@ impl RenderContext for PietGpuRenderContext {
     fn fill_even_odd(&mut self, _shape: impl Shape, _brush: &impl IntoBrush<Self>) {}
 
     fn clip(&mut self, shape: impl Shape) {
-        self.set_fill_mode(FillMode::Nonzero);
+        self.encode_linewidth(-1.0);
         let path = shape.path_elements(TOLERANCE);
         self.encode_path(path, true);
-        let begin_ix = self.elements.len();
-        self.elements.push(Element::BeginClip(Clip {
-            bbox: Default::default(),
-        }));
+        let save_point = self.new_encoder.begin_clip();
         if self.clip_stack.len() >= MAX_BLEND_STACK {
             panic!("Maximum clip/blend stack size {} exceeded", MAX_BLEND_STACK);
         }
         self.clip_stack.push(ClipElement {
             bbox: None,
-            begin_ix,
+            save_point,
         });
-        self.path_count += 1;
         if let Some(tos) = self.state_stack.last_mut() {
             tos.n_clip += 1;
         }
@@ -405,14 +401,7 @@ impl PietGpuRenderContext {
         let tos = self.clip_stack.pop().unwrap();
         let bbox = tos.bbox.unwrap_or_default();
         let bbox_f32_4 = rect_to_f32_4(bbox);
-        self.elements
-            .push(Element::EndClip(Clip { bbox: bbox_f32_4 }));
-        self.path_count += 1;
-        if let Element::BeginClip(begin_clip) = &mut self.elements[tos.begin_ix] {
-            begin_clip.bbox = bbox_f32_4;
-        } else {
-            unreachable!("expected BeginClip, not found");
-        }
+        self.new_encoder.end_clip(bbox_f32_4, tos.save_point);
         if let Some(bbox) = tos.bbox {
             self.union_bbox(bbox);
         }
@@ -468,13 +457,8 @@ impl PietGpuRenderContext {
                 self.new_encoder.fill_color(*rgba_color);
             }
             PietGpuBrush::LinGradient(lin) => {
-                let fill_lin = FillLinGradient {
-                    index: lin.ramp_id,
-                    p0: lin.start,
-                    p1: lin.end,
-                };
-                self.elements.push(Element::FillLinGradient(fill_lin));
-                self.path_count += 1;
+                self.new_encoder
+                    .fill_lin_gradient(lin.ramp_id, lin.start, lin.end);
             }
         }
     }
diff --git a/piet-gpu/src/text.rs b/piet-gpu/src/text.rs
index d25320b..a47c614 100644
--- a/piet-gpu/src/text.rs
+++ b/piet-gpu/src/text.rs
@@ -12,8 +12,8 @@ use piet::{
 
 use crate::encoder::GlyphEncoder;
 use crate::render_ctx::{self, FillMode};
-use crate::PietGpuRenderContext;
 use crate::stages::Transform;
+use crate::PietGpuRenderContext;
 
 // This is very much a hack to get things working.
 // On Windows, can set this to "c:\\Windows\\Fonts\\seguiemj.ttf" to get color emoji
@@ -51,7 +51,6 @@ struct Glyph {
     y: f32,
 }
 
-
 struct TextRenderCtx<'a> {
     scaler: Scaler<'a>,
 }