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https://github.com/italicsjenga/vello.git
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294f6fd1db
Path segments are unsorted, but other elements are using the same sort-middle approach as before. This is a checkpoint. At this point, there are unoptimized versions of tile init and coarse path raster, but it isn't wired up into a working pipeline. Also observing about a 3x performance regression in element processing, which needs to be investigated.
66 lines
2 KiB
C
66 lines
2 KiB
C
// Various constants for the sizes of groups and tiles.
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// Much of this will be made dynamic in various ways, but for now it's easiest
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// to hardcode and keep all in one place.
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// TODO: make the image size dynamic.
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#define IMAGE_WIDTH 2048
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#define IMAGE_HEIGHT 1536
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// TODO: compute this
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#define WIDTH_IN_TILEGROUPS 4
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#define TILEGROUP_WIDTH_PX 512
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#define TILEGROUP_HEIGHT_PX 16
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#define TILEGROUP_INITIAL_ALLOC 1024
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// Quick note on layout of tilegroups (k1 output): in the base,
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// there is a region of size TILEGROUP_STRIDE for each tilegroup.
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// At offset 0 are the main instances, encoded with Jump. At offset
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// TILEGROUP_STROKE_START are the stroke instances, encoded with
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// Head and Link. Similarly for fill.
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#define TILEGROUP_STRIDE 2048
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#define TILEGROUP_STROKE_START 1024
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#define TILEGROUP_FILL_START 1536
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#define TILEGROUP_STROKE_ALLOC 1024
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#define TILEGROUP_FILL_ALLOC 1024
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#define TILEGROUP_INITIAL_STROKE_ALLOC 512
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#define TILEGROUP_INITIAL_FILL_ALLOC 512
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// TODO: compute all these
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#define WIDTH_IN_TILES 128
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#define HEIGHT_IN_TILES 96
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#define TILEGROUP_WIDTH_TILES 32
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#define TILE_WIDTH_PX 16
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#define TILE_HEIGHT_PX 16
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#define PTCL_INITIAL_ALLOC 1024
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// Maximum number of segments in a SegChunk
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#define SEG_CHUNK_N 32
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#define SEG_CHUNK_ALLOC 512
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// Stuff for new algorithm follows; some of the above should get
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// deleted.
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// These should probably be renamed and/or reworked. In the binning
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// kernel, they represent the number of bins. Also, the workgroup size
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// of that kernel is equal to the number of bins, but should probably
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// be more flexible (it's 512 in the K&L paper).
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#define N_TILE_X 16
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#define N_TILE_Y 16
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#define N_TILE (N_TILE_X * N_TILE_Y)
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#define LG_N_TILE 8
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#define N_SLICE (N_TILE / 32)
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// Number of workgroups for binning kernel
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#define N_WG 16
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// This is the ratio of the number of elements in a binning workgroup
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// over the number of elements in a partition workgroup.
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#define ELEMENT_BINNING_RATIO 2
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#define BIN_INITIAL_ALLOC 64
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#define BIN_ALLOC 256
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