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Merge branch 'master' into android2

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This commit is contained in:
Raph Levien 2021-04-20 07:15:10 -07:00
parent e1aced9c5a 4b59525e1f
commit 6602d58054
16 changed files with 67 additions and 86 deletions
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9
piet-gpu/shader/backdrop.comp
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@ -35,16 +35,13 @@ shared Alloc sh_row_alloc[BACKDROP_WG];
shared uint sh_row_width[BACKDROP_WG]; shared uint sh_row_width[BACKDROP_WG];
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
uint th_ix = gl_LocalInvocationID.x; uint th_ix = gl_LocalInvocationID.x;
uint element_ix = gl_GlobalInvocationID.x; uint element_ix = gl_GlobalInvocationID.x;
AnnotatedRef ref = AnnotatedRef(conf.anno_alloc.offset + element_ix * Annotated_size); AnnotatedRef ref = AnnotatedRef(conf.anno_alloc.offset + element_ix * Annotated_size);
// Work assignment: 1 thread : 1 path element // Work assignment: 1 thread : 1 path element
uint row_count = 0; uint row_count = 0;
bool mem_ok = mem_error == NO_ERROR;
if (element_ix < conf.n_elements) { if (element_ix < conf.n_elements) {
AnnotatedTag tag = Annotated_tag(conf.anno_alloc, ref); AnnotatedTag tag = Annotated_tag(conf.anno_alloc, ref);
switch (tag.tag) { switch (tag.tag) {
@ -67,7 +64,7 @@ void main() {
// long as it doesn't cross the left edge. // long as it doesn't cross the left edge.
row_count = 0; row_count = 0;
} }
Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size); Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size, mem_ok);
sh_row_alloc[th_ix] = path_alloc; sh_row_alloc[th_ix] = path_alloc;
} }
} }
@ -95,7 +92,7 @@ void main() {
} }
} }
uint width = sh_row_width[el_ix]; uint width = sh_row_width[el_ix];
if (width > 0) { if (width > 0 && mem_ok) {
// Process one row sequentially // Process one row sequentially
// Read backdrop value per tile and prefix sum it // Read backdrop value per tile and prefix sum it
Alloc tiles_alloc = sh_row_alloc[el_ix]; Alloc tiles_alloc = sh_row_alloc[el_ix];

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piet-gpu/shader/backdrop.spv
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8
piet-gpu/shader/binning.comp
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@ -36,10 +36,6 @@ shared Alloc sh_chunk_alloc[N_TILE];
shared bool sh_alloc_failed; shared bool sh_alloc_failed;
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
uint my_n_elements = conf.n_elements; uint my_n_elements = conf.n_elements;
uint my_partition = gl_WorkGroupID.x; uint my_partition = gl_WorkGroupID.x;
@ -105,7 +101,7 @@ void main() {
count[i][gl_LocalInvocationID.x] = element_count; count[i][gl_LocalInvocationID.x] = element_count;
} }
// element_count is number of elements covering bin for this invocation. // element_count is number of elements covering bin for this invocation.
Alloc chunk_alloc = new_alloc(0, 0); Alloc chunk_alloc = new_alloc(0, 0, true);
if (element_count != 0) { if (element_count != 0) {
// TODO: aggregate atomic adds (subgroup is probably fastest) // TODO: aggregate atomic adds (subgroup is probably fastest)
MallocResult chunk = malloc(element_count * BinInstance_size); MallocResult chunk = malloc(element_count * BinInstance_size);
@ -122,7 +118,7 @@ void main() {
write_mem(conf.bin_alloc, out_ix + 1, chunk_alloc.offset); write_mem(conf.bin_alloc, out_ix + 1, chunk_alloc.offset);
barrier(); barrier();
if (sh_alloc_failed) { if (sh_alloc_failed || mem_error != NO_ERROR) {
return; return;
} }

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piet-gpu/shader/binning.spv
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31
piet-gpu/shader/coarse.comp
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@ -56,7 +56,7 @@ void write_tile_alloc(uint el_ix, Alloc a) {
sh_tile_alloc[el_ix] = a; sh_tile_alloc[el_ix] = a;
} }
Alloc read_tile_alloc(uint el_ix) { Alloc read_tile_alloc(uint el_ix, bool mem_ok) {
return sh_tile_alloc[el_ix]; return sh_tile_alloc[el_ix];
} }
#else #else
@ -64,9 +64,9 @@ void write_tile_alloc(uint el_ix, Alloc a) {
// No-op // No-op
} }
Alloc read_tile_alloc(uint el_ix) { Alloc read_tile_alloc(uint el_ix, bool mem_ok) {
// All memory. // All memory.
return new_alloc(0, memory.length()*4); return new_alloc(0, memory.length()*4, mem_ok);
} }
#endif #endif
@ -109,10 +109,6 @@ void write_fill(Alloc alloc, inout CmdRef cmd_ref, uint flags, Tile tile, float
} }
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
// Could use either linear or 2d layouts for both dispatch and // Could use either linear or 2d layouts for both dispatch and
// invocations within the workgroup. We'll use variables to abstract. // invocations within the workgroup. We'll use variables to abstract.
uint width_in_bins = (conf.width_in_tiles + N_TILE_X - 1)/N_TILE_X; uint width_in_bins = (conf.width_in_tiles + N_TILE_X - 1)/N_TILE_X;
@ -158,6 +154,7 @@ void main() {
uint num_begin_slots = 0; uint num_begin_slots = 0;
uint begin_slot = 0; uint begin_slot = 0;
bool mem_ok = mem_error == NO_ERROR;
while (true) { while (true) {
for (uint i = 0; i < N_SLICE; i++) { for (uint i = 0; i < N_SLICE; i++) {
sh_bitmaps[i][th_ix] = 0; sh_bitmaps[i][th_ix] = 0;
@ -172,7 +169,7 @@ void main() {
uint in_ix = (conf.bin_alloc.offset >> 2) + ((partition_ix + th_ix) * N_TILE + bin_ix) * 2; uint in_ix = (conf.bin_alloc.offset >> 2) + ((partition_ix + th_ix) * N_TILE + bin_ix) * 2;
count = read_mem(conf.bin_alloc, in_ix); count = read_mem(conf.bin_alloc, in_ix);
uint offset = read_mem(conf.bin_alloc, in_ix + 1); uint offset = read_mem(conf.bin_alloc, in_ix + 1);
sh_part_elements[th_ix] = new_alloc(offset, count*BinInstance_size); sh_part_elements[th_ix] = new_alloc(offset, count*BinInstance_size, mem_ok);
} }
// prefix sum of counts // prefix sum of counts
for (uint i = 0; i < LG_N_PART_READ; i++) { for (uint i = 0; i < LG_N_PART_READ; i++) {
@ -196,7 +193,7 @@ void main() {
} }
// use binary search to find element to read // use binary search to find element to read
uint ix = rd_ix + th_ix; uint ix = rd_ix + th_ix;
if (ix >= wr_ix && ix < ready_ix) { if (ix >= wr_ix && ix < ready_ix && mem_ok) {
uint part_ix = 0; uint part_ix = 0;
for (uint i = 0; i < LG_N_PART_READ; i++) { for (uint i = 0; i < LG_N_PART_READ; i++) {
uint probe = part_ix + ((N_PART_READ / 2) >> i); uint probe = part_ix + ((N_PART_READ / 2) >> i);
@ -253,7 +250,7 @@ void main() {
// base relative to bin // base relative to bin
uint base = path.tiles.offset - uint(dy * stride + dx) * Tile_size; uint base = path.tiles.offset - uint(dy * stride + dx) * Tile_size;
sh_tile_base[th_ix] = base; sh_tile_base[th_ix] = base;
Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size); Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size, mem_ok);
write_tile_alloc(th_ix, path_alloc); write_tile_alloc(th_ix, path_alloc);
break; break;
default: default:
@ -288,11 +285,11 @@ void main() {
uint width = sh_tile_width[el_ix]; uint width = sh_tile_width[el_ix];
uint x = sh_tile_x0[el_ix] + seq_ix % width; uint x = sh_tile_x0[el_ix] + seq_ix % width;
uint y = sh_tile_y0[el_ix] + seq_ix / width; uint y = sh_tile_y0[el_ix] + seq_ix / width;
bool include_tile; bool include_tile = false;
if (tag == Annotated_BeginClip || tag == Annotated_EndClip) { if (tag == Annotated_BeginClip || tag == Annotated_EndClip) {
include_tile = true; include_tile = true;
} else { } else if (mem_ok) {
Tile tile = Tile_read(read_tile_alloc(el_ix), TileRef(sh_tile_base[el_ix] + (sh_tile_stride[el_ix] * y + x) * Tile_size)); Tile tile = Tile_read(read_tile_alloc(el_ix, mem_ok), TileRef(sh_tile_base[el_ix] + (sh_tile_stride[el_ix] * y + x) * Tile_size));
// Include the path in the tile if // Include the path in the tile if
// - the tile contains at least a segment (tile offset non-zero) // - the tile contains at least a segment (tile offset non-zero)
// - the tile is completely covered (backdrop non-zero) // - the tile is completely covered (backdrop non-zero)
@ -311,7 +308,7 @@ void main() {
// through the non-segment elements. // through the non-segment elements.
uint slice_ix = 0; uint slice_ix = 0;
uint bitmap = sh_bitmaps[0][th_ix]; uint bitmap = sh_bitmaps[0][th_ix];
while (true) { while (mem_ok) {
if (bitmap == 0) { if (bitmap == 0) {
slice_ix++; slice_ix++;
if (slice_ix == N_SLICE) { if (slice_ix == N_SLICE) {
@ -337,7 +334,7 @@ void main() {
if (clip_zero_depth == 0) { if (clip_zero_depth == 0) {
switch (tag.tag) { switch (tag.tag) {
case Annotated_Color: case Annotated_Color:
Tile tile = Tile_read(read_tile_alloc(element_ref_ix), TileRef(sh_tile_base[element_ref_ix] Tile tile = Tile_read(read_tile_alloc(element_ref_ix, mem_ok), TileRef(sh_tile_base[element_ref_ix]
+ (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size)); + (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size));
AnnoColor fill = Annotated_Color_read(conf.anno_alloc, ref); AnnoColor fill = Annotated_Color_read(conf.anno_alloc, ref);
if (!alloc_cmd(cmd_alloc, cmd_ref, cmd_limit)) { if (!alloc_cmd(cmd_alloc, cmd_ref, cmd_limit)) {
@ -348,7 +345,7 @@ void main() {
cmd_ref.offset += 4 + CmdColor_size; cmd_ref.offset += 4 + CmdColor_size;
break; break;
case Annotated_Image: case Annotated_Image:
tile = Tile_read(read_tile_alloc(element_ref_ix), TileRef(sh_tile_base[element_ref_ix] tile = Tile_read(read_tile_alloc(element_ref_ix, mem_ok), TileRef(sh_tile_base[element_ref_ix]
+ (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size)); + (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size));
AnnoImage fill_img = Annotated_Image_read(conf.anno_alloc, ref); AnnoImage fill_img = Annotated_Image_read(conf.anno_alloc, ref);
if (!alloc_cmd(cmd_alloc, cmd_ref, cmd_limit)) { if (!alloc_cmd(cmd_alloc, cmd_ref, cmd_limit)) {
@ -359,7 +356,7 @@ void main() {
cmd_ref.offset += 4 + CmdImage_size; cmd_ref.offset += 4 + CmdImage_size;
break; break;
case Annotated_BeginClip: case Annotated_BeginClip:
tile = Tile_read(read_tile_alloc(element_ref_ix), TileRef(sh_tile_base[element_ref_ix] tile = Tile_read(read_tile_alloc(element_ref_ix, mem_ok), TileRef(sh_tile_base[element_ref_ix]
+ (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size)); + (sh_tile_stride[element_ref_ix] * tile_y + tile_x) * Tile_size));
if (tile.tile.offset == 0 && tile.backdrop == 0) { if (tile.tile.offset == 0 && tile.backdrop == 0) {
clip_zero_depth = clip_depth + 1; clip_zero_depth = clip_depth + 1;

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piet-gpu/shader/coarse.spv
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5
piet-gpu/shader/elements.comp
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@ -176,10 +176,6 @@ shared uint sh_part_ix;
shared State sh_prefix; shared State sh_prefix;
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
State th_state[N_ROWS]; State th_state[N_ROWS];
// Determine partition to process by atomic counter (described in Section // Determine partition to process by atomic counter (described in Section
// 4.4 of prefix sum paper). // 4.4 of prefix sum paper).
@ -392,7 +388,6 @@ void main() {
vec2 lw = get_linewidth(st); vec2 lw = get_linewidth(st);
anno_begin_clip.linewidth = st.linewidth * sqrt(abs(st.mat.x * st.mat.w - st.mat.y * st.mat.z)); anno_begin_clip.linewidth = st.linewidth * sqrt(abs(st.mat.x * st.mat.w - st.mat.y * st.mat.z));
} else { } else {
anno_begin_clip.bbox = begin_clip.bbox;
anno_fill.linewidth = 0.0; anno_fill.linewidth = 0.0;
} }
out_ref = AnnotatedRef(conf.anno_alloc.offset + (st.path_count - 1) * Annotated_size); out_ref = AnnotatedRef(conf.anno_alloc.offset + (st.path_count - 1) * Annotated_size);

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piet-gpu/shader/elements.spv
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66
piet-gpu/shader/kernel4.comp
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@ -22,45 +22,45 @@
#define CHUNK_DY (TILE_HEIGHT_PX / CHUNK_Y) #define CHUNK_DY (TILE_HEIGHT_PX / CHUNK_Y)
layout(local_size_x = CHUNK_DX, local_size_y = CHUNK_DY) in; layout(local_size_x = CHUNK_DX, local_size_y = CHUNK_DY) in;
layout(set = 0, binding = 1) readonly buffer ConfigBuf { layout(set = 0, binding = 1) restrict readonly buffer ConfigBuf {
Config conf; Config conf;
}; };
layout(rgba8, set = 0, binding = 2) uniform writeonly image2D image; layout(rgba8, set = 0, binding = 2) uniform restrict writeonly image2D image;
#ifdef ENABLE_IMAGE_INDICES #ifdef ENABLE_IMAGE_INDICES
layout(rgba8, set = 0, binding = 3) uniform readonly image2D images[]; layout(rgba8, set = 0, binding = 3) uniform restrict readonly image2D images[];
#else #else
layout(rgba8, set = 0, binding = 3) uniform readonly image2D images[1]; layout(rgba8, set = 0, binding = 3) uniform restrict readonly image2D images[1];
#endif #endif
#include "ptcl.h" #include "ptcl.h"
#include "tile.h" #include "tile.h"
vec3 tosRGB(vec3 rgb) { mediump vec3 tosRGB(mediump vec3 rgb) {
bvec3 cutoff = greaterThanEqual(rgb, vec3(0.0031308)); bvec3 cutoff = greaterThanEqual(rgb, vec3(0.0031308));
vec3 below = vec3(12.92)*rgb; mediump vec3 below = vec3(12.92)*rgb;
vec3 above = vec3(1.055)*pow(rgb, vec3(0.41666)) - vec3(0.055); mediump vec3 above = vec3(1.055)*pow(rgb, vec3(0.41666)) - vec3(0.055);
return mix(below, above, cutoff); return mix(below, above, cutoff);
} }
vec3 fromsRGB(vec3 srgb) { mediump vec3 fromsRGB(mediump vec3 srgb) {
// Formula from EXT_sRGB. // Formula from EXT_sRGB.
bvec3 cutoff = greaterThanEqual(srgb, vec3(0.04045)); bvec3 cutoff = greaterThanEqual(srgb, vec3(0.04045));
vec3 below = srgb/vec3(12.92); mediump vec3 below = srgb/vec3(12.92);
vec3 above = pow((srgb + vec3(0.055))/vec3(1.055), vec3(2.4)); mediump vec3 above = pow((srgb + vec3(0.055))/vec3(1.055), vec3(2.4));
return mix(below, above, cutoff); return mix(below, above, cutoff);
} }
// unpacksRGB unpacks a color in the sRGB color space to a vec4 in the linear color // unpacksRGB unpacks a color in the sRGB color space to a vec4 in the linear color
// space. // space.
vec4 unpacksRGB(uint srgba) { mediump vec4 unpacksRGB(uint srgba) {
vec4 color = unpackUnorm4x8(srgba).wzyx; mediump vec4 color = unpackUnorm4x8(srgba).wzyx;
return vec4(fromsRGB(color.rgb), color.a); return vec4(fromsRGB(color.rgb), color.a);
} }
// packsRGB packs a color in the linear color space into its 8-bit sRGB equivalent. // packsRGB packs a color in the linear color space into its 8-bit sRGB equivalent.
uint packsRGB(vec4 rgba) { uint packsRGB(mediump vec4 rgba) {
rgba = vec4(tosRGB(rgba.rgb), rgba.a); rgba = vec4(tosRGB(rgba.rgb), rgba.a);
return packUnorm4x8(rgba.wzyx); return packUnorm4x8(rgba.wzyx);
} }
@ -69,14 +69,15 @@ uvec2 chunk_offset(uint i) {
return uvec2(i % CHUNK_X * CHUNK_DX, i / CHUNK_X * CHUNK_DY); return uvec2(i % CHUNK_X * CHUNK_DX, i / CHUNK_X * CHUNK_DY);
} }
vec4[CHUNK] fillImage(uvec2 xy, CmdImage cmd_img) { mediump vec4[CHUNK] fillImage(uvec2 xy, CmdImage cmd_img) {
vec4 rgba[CHUNK]; mediump vec4 rgba[CHUNK];
for (uint i = 0; i < CHUNK; i++) { for (uint i = 0; i < CHUNK; i++) {
ivec2 uv = ivec2(xy + chunk_offset(i)) + cmd_img.offset; ivec2 uv = ivec2(xy + chunk_offset(i)) + cmd_img.offset;
mediump vec4 fg_rgba;
#ifdef ENABLE_IMAGE_INDICES #ifdef ENABLE_IMAGE_INDICES
vec4 fg_rgba = imageLoad(images[cmd_img.index], uv); fg_rgba = imageLoad(images[cmd_img.index], uv);
#else #else
vec4 fg_rgba = imageLoad(images[0], uv); fg_rgba = imageLoad(images[0], uv);
#endif #endif
fg_rgba.rgb = fromsRGB(fg_rgba.rgb); fg_rgba.rgb = fromsRGB(fg_rgba.rgb);
rgba[i] = fg_rgba; rgba[i] = fg_rgba;
@ -85,10 +86,6 @@ vec4[CHUNK] fillImage(uvec2 xy, CmdImage cmd_img) {
} }
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
uint tile_ix = gl_WorkGroupID.y * conf.width_in_tiles + gl_WorkGroupID.x; uint tile_ix = gl_WorkGroupID.y * conf.width_in_tiles + gl_WorkGroupID.x;
Alloc cmd_alloc = slice_mem(conf.ptcl_alloc, tile_ix * PTCL_INITIAL_ALLOC, PTCL_INITIAL_ALLOC); Alloc cmd_alloc = slice_mem(conf.ptcl_alloc, tile_ix * PTCL_INITIAL_ALLOC, PTCL_INITIAL_ALLOC);
CmdRef cmd_ref = CmdRef(cmd_alloc.offset); CmdRef cmd_ref = CmdRef(cmd_alloc.offset);
@ -99,7 +96,7 @@ void main() {
uvec2 xy_uint = uvec2(gl_LocalInvocationID.x + TILE_WIDTH_PX * gl_WorkGroupID.x, gl_LocalInvocationID.y + TILE_HEIGHT_PX * gl_WorkGroupID.y); uvec2 xy_uint = uvec2(gl_LocalInvocationID.x + TILE_WIDTH_PX * gl_WorkGroupID.x, gl_LocalInvocationID.y + TILE_HEIGHT_PX * gl_WorkGroupID.y);
vec2 xy = vec2(xy_uint); vec2 xy = vec2(xy_uint);
vec4 rgba[CHUNK]; mediump vec4 rgba[CHUNK];
for (uint i = 0; i < CHUNK; i++) { for (uint i = 0; i < CHUNK; i++) {
rgba[i] = vec4(0.0); rgba[i] = vec4(0.0);
// TODO: remove this debug image support when the actual image method is plumbed. // TODO: remove this debug image support when the actual image method is plumbed.
@ -116,9 +113,10 @@ void main() {
#endif #endif
} }
float area[CHUNK]; mediump float area[CHUNK];
uint clip_depth = 0; uint clip_depth = 0;
while (true) { bool mem_ok = mem_error == NO_ERROR;
while (mem_ok) {
uint tag = Cmd_tag(cmd_alloc, cmd_ref).tag; uint tag = Cmd_tag(cmd_alloc, cmd_ref).tag;
if (tag == Cmd_End) { if (tag == Cmd_End) {
break; break;
@ -127,11 +125,11 @@ void main() {
case Cmd_Stroke: case Cmd_Stroke:
// Calculate distance field from all the line segments in this tile. // Calculate distance field from all the line segments in this tile.
CmdStroke stroke = Cmd_Stroke_read(cmd_alloc, cmd_ref); CmdStroke stroke = Cmd_Stroke_read(cmd_alloc, cmd_ref);
float df[CHUNK]; mediump float df[CHUNK];
for (uint k = 0; k < CHUNK; k++) df[k] = 1e9; for (uint k = 0; k < CHUNK; k++) df[k] = 1e9;
TileSegRef tile_seg_ref = TileSegRef(stroke.tile_ref); TileSegRef tile_seg_ref = TileSegRef(stroke.tile_ref);
do { do {
TileSeg seg = TileSeg_read(new_alloc(tile_seg_ref.offset, TileSeg_size), tile_seg_ref); TileSeg seg = TileSeg_read(new_alloc(tile_seg_ref.offset, TileSeg_size, mem_ok), tile_seg_ref);
vec2 line_vec = seg.vector; vec2 line_vec = seg.vector;
for (uint k = 0; k < CHUNK; k++) { for (uint k = 0; k < CHUNK; k++) {
vec2 dpos = xy + vec2(0.5, 0.5) - seg.origin; vec2 dpos = xy + vec2(0.5, 0.5) - seg.origin;
@ -152,7 +150,7 @@ void main() {
tile_seg_ref = TileSegRef(fill.tile_ref); tile_seg_ref = TileSegRef(fill.tile_ref);
// Calculate coverage based on backdrop + coverage of each line segment // Calculate coverage based on backdrop + coverage of each line segment
do { do {
TileSeg seg = TileSeg_read(new_alloc(tile_seg_ref.offset, TileSeg_size), tile_seg_ref); TileSeg seg = TileSeg_read(new_alloc(tile_seg_ref.offset, TileSeg_size, mem_ok), tile_seg_ref);
for (uint k = 0; k < CHUNK; k++) { for (uint k = 0; k < CHUNK; k++) {
vec2 my_xy = xy + vec2(chunk_offset(k)); vec2 my_xy = xy + vec2(chunk_offset(k));
vec2 start = seg.origin - my_xy; vec2 start = seg.origin - my_xy;
@ -193,18 +191,18 @@ void main() {
break; break;
case Cmd_Color: case Cmd_Color:
CmdColor color = Cmd_Color_read(cmd_alloc, cmd_ref); CmdColor color = Cmd_Color_read(cmd_alloc, cmd_ref);
vec4 fg = unpacksRGB(color.rgba_color); mediump vec4 fg = unpacksRGB(color.rgba_color);
for (uint k = 0; k < CHUNK; k++) { for (uint k = 0; k < CHUNK; k++) {
vec4 fg_k = fg * area[k]; mediump vec4 fg_k = fg * area[k];
rgba[k] = rgba[k] * (1.0 - fg_k.a) + fg_k; rgba[k] = rgba[k] * (1.0 - fg_k.a) + fg_k;
} }
cmd_ref.offset += 4 + CmdColor_size; cmd_ref.offset += 4 + CmdColor_size;
break; break;
case Cmd_Image: case Cmd_Image:
CmdImage fill_img = Cmd_Image_read(cmd_alloc, cmd_ref); CmdImage fill_img = Cmd_Image_read(cmd_alloc, cmd_ref);
vec4 img[CHUNK] = fillImage(xy_uint, fill_img); mediump vec4 img[CHUNK] = fillImage(xy_uint, fill_img);
for (uint k = 0; k < CHUNK; k++) { for (uint k = 0; k < CHUNK; k++) {
vec4 fg_k = img[k] * area[k]; mediump vec4 fg_k = img[k] * area[k];
rgba[k] = rgba[k] * (1.0 - fg_k.a) + fg_k; rgba[k] = rgba[k] * (1.0 - fg_k.a) + fg_k;
} }
cmd_ref.offset += 4 + CmdImage_size; cmd_ref.offset += 4 + CmdImage_size;
@ -215,7 +213,7 @@ void main() {
for (uint k = 0; k < CHUNK; k++) { for (uint k = 0; k < CHUNK; k++) {
uvec2 offset = chunk_offset(k); uvec2 offset = chunk_offset(k);
uint srgb = packsRGB(vec4(rgba[k])); uint srgb = packsRGB(vec4(rgba[k]));
float alpha = clamp(abs(area[k]), 0.0, 1.0); mediump float alpha = clamp(abs(area[k]), 0.0, 1.0);
write_mem(scratch_alloc, base_ix + 0 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX), srgb); write_mem(scratch_alloc, base_ix + 0 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX), srgb);
write_mem(scratch_alloc, base_ix + 1 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX), floatBitsToUint(alpha)); write_mem(scratch_alloc, base_ix + 1 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX), floatBitsToUint(alpha));
rgba[k] = vec4(0.0); rgba[k] = vec4(0.0);
@ -231,8 +229,8 @@ void main() {
uvec2 offset = chunk_offset(k); uvec2 offset = chunk_offset(k);
uint srgb = read_mem(scratch_alloc, base_ix + 0 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX)); uint srgb = read_mem(scratch_alloc, base_ix + 0 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX));
uint alpha = read_mem(scratch_alloc, base_ix + 1 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX)); uint alpha = read_mem(scratch_alloc, base_ix + 1 + CLIP_STATE_SIZE * (offset.x + offset.y * TILE_WIDTH_PX));
vec4 bg = unpacksRGB(srgb); mediump vec4 bg = unpacksRGB(srgb);
vec4 fg = rgba[k] * area[k] * uintBitsToFloat(alpha); mediump vec4 fg = rgba[k] * area[k] * uintBitsToFloat(alpha);
rgba[k] = bg * (1.0 - fg.a) + fg; rgba[k] = bg * (1.0 - fg.a) + fg;
} }
cmd_ref.offset += 4; cmd_ref.offset += 4;

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piet-gpu/shader/kernel4_idx.spv
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19
piet-gpu/shader/mem.h
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@ -44,11 +44,15 @@ struct MallocResult {
}; };
// new_alloc synthesizes an Alloc from an offset and size. // new_alloc synthesizes an Alloc from an offset and size.
Alloc new_alloc(uint offset, uint size) { Alloc new_alloc(uint offset, uint size, bool mem_ok) {
Alloc a; Alloc a;
a.offset = offset; a.offset = offset;
#ifdef MEM_DEBUG #ifdef MEM_DEBUG
a.size = size; if (mem_ok) {
a.size = size;
} else {
a.size = 0;
}
#endif #endif
return a; return a;
} }
@ -56,11 +60,10 @@ Alloc new_alloc(uint offset, uint size) {
// malloc allocates size bytes of memory. // malloc allocates size bytes of memory.
MallocResult malloc(uint size) { MallocResult malloc(uint size) {
MallocResult r; MallocResult r;
r.failed = false;
uint offset = atomicAdd(mem_offset, size); uint offset = atomicAdd(mem_offset, size);
r.alloc = new_alloc(offset, size); r.failed = offset + size > memory.length() * 4;
if (offset + size > memory.length() * 4) { r.alloc = new_alloc(offset, size, !r.failed);
r.failed = true; if (r.failed) {
atomicMax(mem_error, ERR_MALLOC_FAILED); atomicMax(mem_error, ERR_MALLOC_FAILED);
return r; return r;
} }
@ -119,8 +122,10 @@ Alloc slice_mem(Alloc a, uint offset, uint size) {
// but never written. // but never written.
return Alloc(0, 0); return Alloc(0, 0);
} }
return Alloc(a.offset + offset, size);
#else
return Alloc(a.offset + offset);
#endif #endif
return new_alloc(a.offset + offset, size);
} }
// alloc_write writes alloc to memory at offset bytes. // alloc_write writes alloc to memory at offset bytes.

9
piet-gpu/shader/path_coarse.comp
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@ -87,10 +87,6 @@ SubdivResult estimate_subdiv(vec2 p0, vec2 p1, vec2 p2, float sqrt_tol) {
} }
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
uint element_ix = gl_GlobalInvocationID.x; uint element_ix = gl_GlobalInvocationID.x;
PathSegRef ref = PathSegRef(conf.pathseg_alloc.offset + element_ix * PathSeg_size); PathSegRef ref = PathSegRef(conf.pathseg_alloc.offset + element_ix * PathSeg_size);
@ -98,6 +94,7 @@ void main() {
if (element_ix < conf.n_pathseg) { if (element_ix < conf.n_pathseg) {
tag = PathSeg_tag(conf.pathseg_alloc, ref); tag = PathSeg_tag(conf.pathseg_alloc, ref);
} }
bool mem_ok = mem_error == NO_ERROR;
switch (tag.tag) { switch (tag.tag) {
case PathSeg_Cubic: case PathSeg_Cubic:
PathCubic cubic = PathSeg_Cubic_read(conf.pathseg_alloc, ref); PathCubic cubic = PathSeg_Cubic_read(conf.pathseg_alloc, ref);
@ -135,7 +132,7 @@ void main() {
bool is_stroke = fill_mode_from_flags(tag.flags) == MODE_STROKE; bool is_stroke = fill_mode_from_flags(tag.flags) == MODE_STROKE;
uint path_ix = cubic.path_ix; uint path_ix = cubic.path_ix;
Path path = Path_read(conf.tile_alloc, PathRef(conf.tile_alloc.offset + path_ix * Path_size)); Path path = Path_read(conf.tile_alloc, PathRef(conf.tile_alloc.offset + path_ix * Path_size));
Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size); Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size, mem_ok);
ivec4 bbox = ivec4(path.bbox); ivec4 bbox = ivec4(path.bbox);
vec2 p0 = cubic.p0; vec2 p0 = cubic.p0;
qp0 = cubic.p0; qp0 = cubic.p0;
@ -195,7 +192,7 @@ void main() {
uint n_tile_alloc = uint((x1 - x0) * (y1 - y0)); uint n_tile_alloc = uint((x1 - x0) * (y1 - y0));
// Consider using subgroups to aggregate atomic add. // Consider using subgroups to aggregate atomic add.
MallocResult tile_alloc = malloc(n_tile_alloc * TileSeg_size); MallocResult tile_alloc = malloc(n_tile_alloc * TileSeg_size);
if (tile_alloc.failed) { if (tile_alloc.failed || !mem_ok) {
return; return;
} }
uint tile_offset = tile_alloc.alloc.offset; uint tile_offset = tile_alloc.alloc.offset;

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6
piet-gpu/shader/tile_alloc.comp
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@ -28,10 +28,6 @@ shared uint sh_tile_count[TILE_ALLOC_WG];
shared MallocResult sh_tile_alloc; shared MallocResult sh_tile_alloc;
void main() { void main() {
if (mem_error != NO_ERROR) {
return;
}
uint th_ix = gl_LocalInvocationID.x; uint th_ix = gl_LocalInvocationID.x;
uint element_ix = gl_GlobalInvocationID.x; uint element_ix = gl_GlobalInvocationID.x;
PathRef path_ref = PathRef(conf.tile_alloc.offset + element_ix * Path_size); PathRef path_ref = PathRef(conf.tile_alloc.offset + element_ix * Path_size);
@ -86,7 +82,7 @@ void main() {
} }
barrier(); barrier();
MallocResult alloc_start = sh_tile_alloc; MallocResult alloc_start = sh_tile_alloc;
if (alloc_start.failed) { if (alloc_start.failed || mem_error != NO_ERROR) {
return; return;
} }

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