From f0127812eb31d4fc0cad331838eb727982002ee4 Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Thu, 18 Mar 2021 20:17:04 +0100
Subject: [PATCH] tightly pack fine rasterizer commands

Reclaims the space waste from splitting fill mode commands from fill
commands.

For example, a CmdStroke + CmdColor use an extra tag word compared to
the former combined CmdStroke. This change shaves off that one word.

In the future, we can pack several command tags into one tag word,
saving even more space.

Fixes #66

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 piet-gpu/shader/coarse.comp  |  22 ++++++++++++++--------
 piet-gpu/shader/coarse.spv   | Bin 57852 -> 58380 bytes
 piet-gpu/shader/kernel4.comp |   9 ++++++++-
 piet-gpu/shader/kernel4.spv  | Bin 37712 -> 38328 bytes
 4 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/piet-gpu/shader/coarse.comp b/piet-gpu/shader/coarse.comp
index 860be2e..a4837bd 100644
--- a/piet-gpu/shader/coarse.comp
+++ b/piet-gpu/shader/coarse.comp
@@ -324,16 +324,18 @@ void main() {
                         if (tile.tile.offset != 0) {
                             CmdFill cmd_fill = CmdFill(tile.tile.offset, tile.backdrop);
                             Cmd_Fill_write(cmd_alloc, cmd_ref, cmd_fill);
+                            cmd_ref.offset += 4 + CmdFill_size;
                         } else {
                             Cmd_Solid_write(cmd_alloc, cmd_ref);
+                            cmd_ref.offset += 4;
                         }
                     } else {
                         CmdStroke cmd_stroke = CmdStroke(tile.tile.offset, 0.5 * fill.linewidth);
                         Cmd_Stroke_write(cmd_alloc, cmd_ref, cmd_stroke);
+                        cmd_ref.offset += 4 + CmdStroke_size;
                     }
-                    cmd_ref.offset += Cmd_size;
                     Cmd_Color_write(cmd_alloc, cmd_ref, CmdColor(fill.rgba_color));
-                    cmd_ref.offset += Cmd_size;
+                    cmd_ref.offset += 4 + CmdColor_size;
                     break;
                 case Annotated_Image:
                     tile = Tile_read(read_tile_alloc(element_ref_ix), TileRef(sh_tile_base[element_ref_ix]
@@ -346,16 +348,18 @@ void main() {
                         if (tile.tile.offset != 0) {
                             CmdFill cmd_fill = CmdFill(tile.tile.offset, tile.backdrop);
                             Cmd_Fill_write(cmd_alloc, cmd_ref, cmd_fill);
+                            cmd_ref.offset += 4 + CmdFill_size;
                         } else {
                             Cmd_Solid_write(cmd_alloc, cmd_ref);
+                            cmd_ref.offset += 4;
                         }
                     } else {
                         CmdStroke cmd_stroke = CmdStroke(tile.tile.offset, 0.5 * fill_img.linewidth);
                         Cmd_Stroke_write(cmd_alloc, cmd_ref, cmd_stroke);
+                        cmd_ref.offset += 4 + CmdStroke_size;
                     }
-                    cmd_ref.offset += Cmd_size;
                     Cmd_Image_write(cmd_alloc, cmd_ref, CmdImage(fill_img.index, fill_img.offset));
-                    cmd_ref.offset += Cmd_size;
+                    cmd_ref.offset += 4 + CmdImage_size;
                     break;
                 case Annotated_BeginClip:
                     tile = Tile_read(read_tile_alloc(element_ref_ix), TileRef(sh_tile_base[element_ref_ix]
@@ -373,18 +377,20 @@ void main() {
                             if (tile.tile.offset != 0) {
                                 CmdFill cmd_fill = CmdFill(tile.tile.offset, tile.backdrop);
                                 Cmd_Fill_write(cmd_alloc, cmd_ref, cmd_fill);
+                                cmd_ref.offset += 4 + CmdFill_size;
                             } else {
                                 // TODO: here is where a bunch of optimization magic should happen
                                 float alpha = tile.backdrop == 0 ? 0.0 : 1.0;
                                 Cmd_Alpha_write(cmd_alloc, cmd_ref, CmdAlpha(alpha));
+                                cmd_ref.offset += 4 + CmdAlpha_size;
                             }
                         } else {
                             CmdStroke cmd_stroke = CmdStroke(tile.tile.offset, 0.5 * begin_clip.linewidth);
                             Cmd_Stroke_write(cmd_alloc, cmd_ref, cmd_stroke);
+                            cmd_ref.offset += 4 + CmdStroke_size;
                         }
-                        cmd_ref.offset += Cmd_size;
                         Cmd_BeginClip_write(cmd_alloc, cmd_ref);
-                        cmd_ref.offset += Cmd_size;
+                        cmd_ref.offset += 4;
                         if (clip_depth < 32) {
                             clip_one_mask &= ~(1 << clip_depth);
                         }
@@ -398,9 +404,9 @@ void main() {
                             break;
                         }
                         Cmd_Solid_write(cmd_alloc, cmd_ref);
-                        cmd_ref.offset += Cmd_size;
+                        cmd_ref.offset += 4;
                         Cmd_EndClip_write(cmd_alloc, cmd_ref);
-                        cmd_ref.offset += Cmd_size;
+                        cmd_ref.offset += 4;
                     }
                     break;
                 }
diff --git a/piet-gpu/shader/coarse.spv b/piet-gpu/shader/coarse.spv
index 7e85c00d21ea24504008271f6a538a0d649e516b..763da55dfe178000cde8215b1f25e0e200f1a2dc 100644
GIT binary patch
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diff --git a/piet-gpu/shader/kernel4.comp b/piet-gpu/shader/kernel4.comp
index 8e26e1b..b9f59dc 100644
--- a/piet-gpu/shader/kernel4.comp
+++ b/piet-gpu/shader/kernel4.comp
@@ -153,6 +153,7 @@ void main() {
             for (uint k = 0; k < CHUNK; k++) {
                 area[k] = clamp(stroke.half_width + 0.5 - df[k], 0.0, 1.0);
             }
+            cmd_ref.offset += 4 + CmdStroke_size;
             break;
         case Cmd_Fill:
             CmdFill fill = Cmd_Fill_read(cmd_alloc, cmd_ref);
@@ -184,17 +185,20 @@ void main() {
             for (uint k = 0; k < CHUNK; k++) {
                 area[k] = min(abs(area[k]), 1.0);
             }
+            cmd_ref.offset += 4 + CmdFill_size;
             break;
         case Cmd_Solid:
             for (uint k = 0; k < CHUNK; k++) {
                 area[k] = 1.0;
             }
+            cmd_ref.offset += 4;
             break;
         case Cmd_Alpha:
             CmdAlpha alpha = Cmd_Alpha_read(cmd_alloc, cmd_ref);
             for (uint k = 0; k < CHUNK; k++) {
                 area[k] = alpha.alpha;
             }
+            cmd_ref.offset += 4 + CmdAlpha_size;
             break;
         case Cmd_Color:
             CmdColor color = Cmd_Color_read(cmd_alloc, cmd_ref);
@@ -202,6 +206,7 @@ void main() {
             for (uint k = 0; k < CHUNK; k++) {
                 rgb[k] = mix(rgb[k], fg_rgba.rgb, mask[k] * area[k] * fg_rgba.a);
             }
+            cmd_ref.offset += 4 + CmdColor_size;
             break;
         case Cmd_Image:
             CmdImage fill_img = Cmd_Image_read(cmd_alloc, cmd_ref);
@@ -209,6 +214,7 @@ void main() {
             for (uint k = 0; k < CHUNK; k++) {
                 rgb[k] = mix(rgb[k], rgba[k].rgb, mask[k] * area[k] * rgba[k].a);
             }
+            cmd_ref.offset += 4 + CmdImage_size;
             break;
         case Cmd_BeginClip:
             uint blend_slot = blend_sp % BLEND_STACK_SIZE;
@@ -229,6 +235,7 @@ void main() {
                 blend_stack[blend_slot][k] = packsRGB(vec4(rgb[k], clamp(abs(area[k]), 0.0, 1.0)));
             }
             blend_sp++;
+            cmd_ref.offset += 4;
             break;
         case Cmd_EndClip:
             blend_slot = (blend_sp - 1) % BLEND_STACK_SIZE;
@@ -245,13 +252,13 @@ void main() {
                 vec4 rgba = unpacksRGB(blend_stack[blend_slot][k]);
                 rgb[k] = mix(rgba.rgb, rgb[k], area[k] * rgba.a);
             }
+            cmd_ref.offset += 4;
             break;
         case Cmd_Jump:
             cmd_ref = CmdRef(Cmd_Jump_read(cmd_alloc, cmd_ref).new_ref);
             cmd_alloc.offset = cmd_ref.offset;
             continue;
         }
-        cmd_ref.offset += Cmd_size;
     }
 
     for (uint i = 0; i < CHUNK; i++) {
diff --git a/piet-gpu/shader/kernel4.spv b/piet-gpu/shader/kernel4.spv
index 91e54ddfff9844a1350488c066010c6c7398e303..5f776e438a537827e3b267d839191e0790d3e4c0 100644
GIT binary patch
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