vello/piet-gpu/shader/gen/binning.msl

#pragma clang diagnostic ignored "-Wmissing-prototypes"
#pragma clang diagnostic ignored "-Wunused-variable"

#include <metal_stdlib>
#include <simd/simd.h>
#include <metal_atomic>

using namespace metal;

struct Alloc
{
    uint offset;
};

struct MallocResult
{
    Alloc alloc;
    bool failed;
};

struct AnnotatedRef
{
    uint offset;
};

struct AnnotatedTag
{
    uint tag;
    uint flags;
};

struct BinInstanceRef
{
    uint offset;
};

struct BinInstance
{
    uint element_ix;
};

struct DrawMonoid
{
    uint path_ix;
    uint clip_ix;
};

struct Memory
{
    uint mem_offset;
    uint mem_error;
    uint memory[1];
};

struct Alloc_1
{
    uint offset;
};

struct Config
{
    uint n_elements;
    uint n_pathseg;
    uint width_in_tiles;
    uint height_in_tiles;
    Alloc_1 tile_alloc;
    Alloc_1 bin_alloc;
    Alloc_1 ptcl_alloc;
    Alloc_1 pathseg_alloc;
    Alloc_1 anno_alloc;
    Alloc_1 trans_alloc;
    Alloc_1 bbox_alloc;
    Alloc_1 drawmonoid_alloc;
    Alloc_1 clip_alloc;
    Alloc_1 clip_bic_alloc;
    Alloc_1 clip_stack_alloc;
    Alloc_1 clip_bbox_alloc;
    uint n_trans;
    uint n_path;
    uint n_clip;
    uint trans_offset;
    uint linewidth_offset;
    uint pathtag_offset;
    uint pathseg_offset;
};

struct ConfigBuf
{
    Config conf;
};

constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(256u, 1u, 1u);

static inline __attribute__((always_inline))
bool touch_mem(thread const Alloc& alloc, thread const uint& offset)
{
    return true;
}

static inline __attribute__((always_inline))
uint read_mem(thread const Alloc& alloc, thread const uint& offset, device Memory& v_94, constant uint& v_94BufferSize)
{
    Alloc param = alloc;
    uint param_1 = offset;
    if (!touch_mem(param, param_1))
    {
        return 0u;
    }
    uint v = v_94.memory[offset];
    return v;
}

static inline __attribute__((always_inline))
AnnotatedTag Annotated_tag(thread const Alloc& a, thread const AnnotatedRef& ref, device Memory& v_94, constant uint& v_94BufferSize)
{
    Alloc param = a;
    uint param_1 = ref.offset >> uint(2);
    uint tag_and_flags = read_mem(param, param_1, v_94, v_94BufferSize);
    return AnnotatedTag{ tag_and_flags & 65535u, tag_and_flags >> uint(16) };
}

static inline __attribute__((always_inline))
DrawMonoid load_draw_monoid(thread const uint& element_ix, device Memory& v_94, constant uint& v_94BufferSize, const device ConfigBuf& v_202)
{
    uint base = (v_202.conf.drawmonoid_alloc.offset >> uint(2)) + (2u * element_ix);
    uint path_ix = v_94.memory[base];
    uint clip_ix = v_94.memory[base + 1u];
    return DrawMonoid{ path_ix, clip_ix };
}

static inline __attribute__((always_inline))
float4 load_clip_bbox(thread const uint& clip_ix, device Memory& v_94, constant uint& v_94BufferSize, const device ConfigBuf& v_202)
{
    uint base = (v_202.conf.clip_bbox_alloc.offset >> uint(2)) + (4u * clip_ix);
    float x0 = as_type<float>(v_94.memory[base]);
    float y0 = as_type<float>(v_94.memory[base + 1u]);
    float x1 = as_type<float>(v_94.memory[base + 2u]);
    float y1 = as_type<float>(v_94.memory[base + 3u]);
    float4 bbox = float4(x0, y0, x1, y1);
    return bbox;
}

static inline __attribute__((always_inline))
float4 load_path_bbox(thread const uint& path_ix, device Memory& v_94, constant uint& v_94BufferSize, const device ConfigBuf& v_202)
{
    uint base = (v_202.conf.bbox_alloc.offset >> uint(2)) + (6u * path_ix);
    float bbox_l = float(v_94.memory[base]) - 32768.0;
    float bbox_t = float(v_94.memory[base + 1u]) - 32768.0;
    float bbox_r = float(v_94.memory[base + 2u]) - 32768.0;
    float bbox_b = float(v_94.memory[base + 3u]) - 32768.0;
    float4 bbox = float4(bbox_l, bbox_t, bbox_r, bbox_b);
    return bbox;
}

static inline __attribute__((always_inline))
float4 bbox_intersect(thread const float4& a, thread const float4& b)
{
    return float4(fast::max(a.xy, b.xy), fast::min(a.zw, b.zw));
}

static inline __attribute__((always_inline))
void store_path_bbox(thread const AnnotatedRef& ref, thread const float4& bbox, device Memory& v_94, constant uint& v_94BufferSize)
{
    uint ix = ref.offset >> uint(2);
    v_94.memory[ix + 1u] = as_type<uint>(bbox.x);
    v_94.memory[ix + 2u] = as_type<uint>(bbox.y);
    v_94.memory[ix + 3u] = as_type<uint>(bbox.z);
    v_94.memory[ix + 4u] = as_type<uint>(bbox.w);
}

static inline __attribute__((always_inline))
Alloc new_alloc(thread const uint& offset, thread const uint& size, thread const bool& mem_ok)
{
    Alloc a;
    a.offset = offset;
    return a;
}

static inline __attribute__((always_inline))
MallocResult malloc(thread const uint& size, device Memory& v_94, constant uint& v_94BufferSize)
{
    uint _100 = atomic_fetch_add_explicit((device atomic_uint*)&v_94.mem_offset, size, memory_order_relaxed);
    uint offset = _100;
    MallocResult r;
    r.failed = (offset + size) > uint(int((v_94BufferSize - 8) / 4) * 4);
    uint param = offset;
    uint param_1 = size;
    bool param_2 = !r.failed;
    r.alloc = new_alloc(param, param_1, param_2);
    if (r.failed)
    {
        uint _129 = atomic_fetch_max_explicit((device atomic_uint*)&v_94.mem_error, 1u, memory_order_relaxed);
        return r;
    }
    return r;
}

static inline __attribute__((always_inline))
void write_mem(thread const Alloc& alloc, thread const uint& offset, thread const uint& val, device Memory& v_94, constant uint& v_94BufferSize)
{
    Alloc param = alloc;
    uint param_1 = offset;
    if (!touch_mem(param, param_1))
    {
        return;
    }
    v_94.memory[offset] = val;
}

static inline __attribute__((always_inline))
void BinInstance_write(thread const Alloc& a, thread const BinInstanceRef& ref, thread const BinInstance& s, device Memory& v_94, constant uint& v_94BufferSize)
{
    uint ix = ref.offset >> uint(2);
    Alloc param = a;
    uint param_1 = ix + 0u;
    uint param_2 = s.element_ix;
    write_mem(param, param_1, param_2, v_94, v_94BufferSize);
}

kernel void main0(constant uint* spvBufferSizeConstants [[buffer(25)]], device Memory& v_94 [[buffer(0)]], const device ConfigBuf& v_202 [[buffer(1)]], uint3 gl_WorkGroupID [[threadgroup_position_in_grid]], uint3 gl_LocalInvocationID [[thread_position_in_threadgroup]])
{
    threadgroup uint bitmaps[8][256];
    threadgroup short sh_alloc_failed;
    threadgroup uint count[8][256];
    threadgroup Alloc sh_chunk_alloc[256];
    constant uint& v_94BufferSize = spvBufferSizeConstants[0];
    uint my_n_elements = v_202.conf.n_elements;
    uint my_partition = gl_WorkGroupID.x;
    for (uint i = 0u; i < 8u; i++)
    {
        bitmaps[i][gl_LocalInvocationID.x] = 0u;
    }
    if (gl_LocalInvocationID.x == 0u)
    {
        sh_alloc_failed = short(false);
    }
    threadgroup_barrier(mem_flags::mem_threadgroup);
    uint element_ix = (my_partition * 256u) + gl_LocalInvocationID.x;
    AnnotatedRef ref = AnnotatedRef{ v_202.conf.anno_alloc.offset + (element_ix * 40u) };
    uint tag = 0u;
    if (element_ix < my_n_elements)
    {
        Alloc param;
        param.offset = v_202.conf.anno_alloc.offset;
        AnnotatedRef param_1 = ref;
        tag = Annotated_tag(param, param_1, v_94, v_94BufferSize).tag;
    }
    int x0 = 0;
    int y0 = 0;
    int x1 = 0;
    int y1 = 0;
    switch (tag)
    {
        case 1u:
        case 2u:
        case 3u:
        case 4u:
        case 5u:
        {
            uint param_2 = element_ix;
            DrawMonoid draw_monoid = load_draw_monoid(param_2, v_94, v_94BufferSize, v_202);
            uint path_ix = draw_monoid.path_ix;
            float4 clip_bbox = float4(-1000000000.0, -1000000000.0, 1000000000.0, 1000000000.0);
            uint clip_ix = draw_monoid.clip_ix;
            if (clip_ix > 0u)
            {
                uint param_3 = clip_ix - 1u;
                clip_bbox = load_clip_bbox(param_3, v_94, v_94BufferSize, v_202);
            }
            uint param_4 = path_ix;
            float4 path_bbox = load_path_bbox(param_4, v_94, v_94BufferSize, v_202);
            float4 param_5 = path_bbox;
            float4 param_6 = clip_bbox;
            float4 bbox = bbox_intersect(param_5, param_6);
            float4 _473 = bbox;
            float4 _475 = bbox;
            float2 _477 = fast::max(_473.xy, _475.zw);
            bbox.z = _477.x;
            bbox.w = _477.y;
            AnnotatedRef param_7 = ref;
            float4 param_8 = bbox;
            store_path_bbox(param_7, param_8, v_94, v_94BufferSize);
            x0 = int(floor(bbox.x * 0.00390625));
            y0 = int(floor(bbox.y * 0.00390625));
            x1 = int(ceil(bbox.z * 0.00390625));
            y1 = int(ceil(bbox.w * 0.00390625));
            break;
        }
    }
    uint width_in_bins = ((v_202.conf.width_in_tiles + 16u) - 1u) / 16u;
    uint height_in_bins = ((v_202.conf.height_in_tiles + 16u) - 1u) / 16u;
    x0 = clamp(x0, 0, int(width_in_bins));
    x1 = clamp(x1, x0, int(width_in_bins));
    y0 = clamp(y0, 0, int(height_in_bins));
    y1 = clamp(y1, y0, int(height_in_bins));
    if (x0 == x1)
    {
        y1 = y0;
    }
    int x = x0;
    int y = y0;
    uint my_slice = gl_LocalInvocationID.x / 32u;
    uint my_mask = 1u << (gl_LocalInvocationID.x & 31u);
    while (y < y1)
    {
        uint _581 = atomic_fetch_or_explicit((threadgroup atomic_uint*)&bitmaps[my_slice][(uint(y) * width_in_bins) + uint(x)], my_mask, memory_order_relaxed);
        x++;
        if (x == x1)
        {
            x = x0;
            y++;
        }
    }
    threadgroup_barrier(mem_flags::mem_threadgroup);
    uint element_count = 0u;
    for (uint i_1 = 0u; i_1 < 8u; i_1++)
    {
        element_count += uint(int(popcount(bitmaps[i_1][gl_LocalInvocationID.x])));
        count[i_1][gl_LocalInvocationID.x] = element_count;
    }
    uint param_9 = 0u;
    uint param_10 = 0u;
    bool param_11 = true;
    Alloc chunk_alloc = new_alloc(param_9, param_10, param_11);
    if (element_count != 0u)
    {
        uint param_12 = element_count * 4u;
        MallocResult _631 = malloc(param_12, v_94, v_94BufferSize);
        MallocResult chunk = _631;
        chunk_alloc = chunk.alloc;
        sh_chunk_alloc[gl_LocalInvocationID.x] = chunk_alloc;
        if (chunk.failed)
        {
            sh_alloc_failed = short(true);
        }
    }
    uint out_ix = (v_202.conf.bin_alloc.offset >> uint(2)) + (((my_partition * 256u) + gl_LocalInvocationID.x) * 2u);
    Alloc param_13;
    param_13.offset = v_202.conf.bin_alloc.offset;
    uint param_14 = out_ix;
    uint param_15 = element_count;
    write_mem(param_13, param_14, param_15, v_94, v_94BufferSize);
    Alloc param_16;
    param_16.offset = v_202.conf.bin_alloc.offset;
    uint param_17 = out_ix + 1u;
    uint param_18 = chunk_alloc.offset;
    write_mem(param_16, param_17, param_18, v_94, v_94BufferSize);
    threadgroup_barrier(mem_flags::mem_threadgroup);
    bool _687;
    if (!bool(sh_alloc_failed))
    {
        _687 = v_94.mem_error != 0u;
    }
    else
    {
        _687 = bool(sh_alloc_failed);
    }
    if (_687)
    {
        return;
    }
    x = x0;
    y = y0;
    while (y < y1)
    {
        uint bin_ix = (uint(y) * width_in_bins) + uint(x);
        uint out_mask = bitmaps[my_slice][bin_ix];
        if ((out_mask & my_mask) != 0u)
        {
            uint idx = uint(int(popcount(out_mask & (my_mask - 1u))));
            if (my_slice > 0u)
            {
                idx += count[my_slice - 1u][bin_ix];
            }
            Alloc out_alloc = sh_chunk_alloc[bin_ix];
            uint out_offset = out_alloc.offset + (idx * 4u);
            Alloc param_19 = out_alloc;
            BinInstanceRef param_20 = BinInstanceRef{ out_offset };
            BinInstance param_21 = BinInstance{ element_ix };
            BinInstance_write(param_19, param_20, param_21, v_94, v_94BufferSize);
        }
        x++;
        if (x == x1)
        {
            x = x0;
            y++;
        }
    }
}