1 files changed, 51 insertions, 0 deletions
diff --git a/vendor/gioui.org/shader/piet/setup.h b/vendor/gioui.org/shader/piet/setup.h
new file mode 100644
index 0000000..83b6d1d
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+++ b/vendor/gioui.org/shader/piet/setup.h
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+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
+// Various constants for the sizes of groups and tiles.
+
+// Much of this will be made dynamic in various ways, but for now it's easiest
+// to hardcode and keep all in one place.
+
+// A LG_WG_FACTOR of n scales workgroup sizes by 2^n. Use 0 for a
+// maximum workgroup size of 128, or 1 for a maximum size of 256.
+#define LG_WG_FACTOR 0
+#define WG_FACTOR (1<<LG_WG_FACTOR)
+
+#define TILE_WIDTH_PX 32
+#define TILE_HEIGHT_PX 32
+
+#define PTCL_INITIAL_ALLOC 1024
+
+// These should probably be renamed and/or reworked. In the binning
+// kernel, they represent the number of bins. Also, the workgroup size
+// of that kernel is equal to the number of bins, but should probably
+// be more flexible (it's 512 in the K&L paper).
+#define N_TILE_X 16
+#define N_TILE_Y (8 * WG_FACTOR)
+#define N_TILE (N_TILE_X * N_TILE_Y)
+#define LG_N_TILE (7 + LG_WG_FACTOR)
+#define N_SLICE (N_TILE / 32)
+
+struct Config {
+    uint n_elements; // paths
+    uint n_pathseg;
+    uint width_in_tiles;
+    uint height_in_tiles;
+    Alloc tile_alloc;
+    Alloc bin_alloc;
+    Alloc ptcl_alloc;
+    Alloc pathseg_alloc;
+    Alloc anno_alloc;
+    Alloc trans_alloc;
+};
+
+// Fill modes.
+#define MODE_NONZERO 0
+#define MODE_STROKE 1
+
+// Size of kernel4 clip state, in words.
+#define CLIP_STATE_SIZE 2
+
+// fill_mode_from_flags extracts the fill mode from tag flags.
+uint fill_mode_from_flags(uint flags) {
+    return flags & 0x1;
+}