mirror of
https://github.com/italicsjenga/vello.git
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3b67a4e7c1
This PR reworks the clip implementation. The highlight is that clip bounding box accounting is now done on GPU rather than CPU. The clip mask is also rasterized on EndClip rather than BeginClip, which decreases memory traffic needed for the clip stack. This is a pretty good working state, but not all cleanup has been applied. An important next step is to remove the CPU clip accounting (it is computed and encoded, but that result is not used). Another step is to remove the Annotated structure entirely. Fixes #88. Also relevant to #119
65 lines
1.3 KiB
Plaintext
Generated
65 lines
1.3 KiB
Plaintext
Generated
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct Alloc
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{
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uint offset;
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};
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struct Config
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{
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uint n_elements;
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uint n_pathseg;
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uint width_in_tiles;
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uint height_in_tiles;
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Alloc tile_alloc;
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Alloc bin_alloc;
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Alloc ptcl_alloc;
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Alloc pathseg_alloc;
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Alloc anno_alloc;
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Alloc trans_alloc;
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Alloc bbox_alloc;
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Alloc drawmonoid_alloc;
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Alloc clip_alloc;
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Alloc clip_bic_alloc;
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Alloc clip_stack_alloc;
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Alloc clip_bbox_alloc;
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uint n_trans;
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uint n_path;
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uint n_clip;
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uint trans_offset;
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uint linewidth_offset;
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uint pathtag_offset;
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uint pathseg_offset;
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};
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struct ConfigBuf
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{
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Config conf;
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};
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struct Memory
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{
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uint mem_offset;
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uint mem_error;
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uint memory[1];
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};
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constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(512u, 1u, 1u);
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kernel void main0(device Memory& _45 [[buffer(0)]], const device ConfigBuf& _21 [[buffer(1)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]])
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{
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uint ix = gl_GlobalInvocationID.x;
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if (ix < _21.conf.n_path)
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{
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uint out_ix = (_21.conf.bbox_alloc.offset >> uint(2)) + (6u * ix);
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_45.memory[out_ix] = 65535u;
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_45.memory[out_ix + 1u] = 65535u;
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_45.memory[out_ix + 2u] = 0u;
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_45.memory[out_ix + 3u] = 0u;
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}
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}
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