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07e07c7544
As described in #62, the non-deterministic scene monoid may result in slightly different transformations for path segments in an otherwise closed path. This change ensures consistent transformation across paths in three steps. First, absolute transformations computed by the scene monoid is stored along with path segments and annotated elements. Second, elements.comp no longer transforms path segments. Instead, each segment is stored untransformed along with a reference to its absolute transformation. Finally, path_coarse performs the transformation of path segments. Because all segments in a path share a single transformation reference, the inconsistency in #62 is avoided. Fixes #62 Signed-off-by: Elias Naur <mail@eliasnaur.com>
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
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// Code auto-generated by piet-gpu-derive
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struct StateRef {
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uint offset;
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};
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struct State {
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vec4 mat;
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vec2 translate;
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vec4 bbox;
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float linewidth;
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uint flags;
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uint path_count;
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uint pathseg_count;
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uint trans_count;
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};
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#define State_size 60
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StateRef State_index(StateRef ref, uint index) {
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return StateRef(ref.offset + index * State_size);
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}
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State State_read(StateRef ref) {
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uint ix = ref.offset >> 2;
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uint raw0 = state[ix + 0];
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uint raw1 = state[ix + 1];
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uint raw2 = state[ix + 2];
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uint raw3 = state[ix + 3];
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uint raw4 = state[ix + 4];
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uint raw5 = state[ix + 5];
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uint raw6 = state[ix + 6];
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uint raw7 = state[ix + 7];
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uint raw8 = state[ix + 8];
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uint raw9 = state[ix + 9];
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uint raw10 = state[ix + 10];
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uint raw11 = state[ix + 11];
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uint raw12 = state[ix + 12];
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uint raw13 = state[ix + 13];
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uint raw14 = state[ix + 14];
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State s;
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s.mat = vec4(uintBitsToFloat(raw0), uintBitsToFloat(raw1), uintBitsToFloat(raw2), uintBitsToFloat(raw3));
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s.translate = vec2(uintBitsToFloat(raw4), uintBitsToFloat(raw5));
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s.bbox = vec4(uintBitsToFloat(raw6), uintBitsToFloat(raw7), uintBitsToFloat(raw8), uintBitsToFloat(raw9));
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s.linewidth = uintBitsToFloat(raw10);
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s.flags = raw11;
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s.path_count = raw12;
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s.pathseg_count = raw13;
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s.trans_count = raw14;
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return s;
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}
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void State_write(StateRef ref, State s) {
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uint ix = ref.offset >> 2;
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state[ix + 0] = floatBitsToUint(s.mat.x);
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state[ix + 1] = floatBitsToUint(s.mat.y);
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state[ix + 2] = floatBitsToUint(s.mat.z);
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state[ix + 3] = floatBitsToUint(s.mat.w);
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state[ix + 4] = floatBitsToUint(s.translate.x);
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state[ix + 5] = floatBitsToUint(s.translate.y);
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state[ix + 6] = floatBitsToUint(s.bbox.x);
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state[ix + 7] = floatBitsToUint(s.bbox.y);
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state[ix + 8] = floatBitsToUint(s.bbox.z);
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state[ix + 9] = floatBitsToUint(s.bbox.w);
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state[ix + 10] = floatBitsToUint(s.linewidth);
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state[ix + 11] = s.flags;
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state[ix + 12] = s.path_count;
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state[ix + 13] = s.pathseg_count;
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state[ix + 14] = s.trans_count;
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}
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