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gpu: eliminate gaps by ensuring consistent transformations

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This is another attempt at fixing the issue described in [0], the
previous attempt was reverted[1].

This change fixes the issue by tracking resolved transformations and
ensure that all segments within a path share a single transformation.

[0] https://github.com/linebender/piet-gpu/issues/62
[1] https://gioui.org/commit/2b21b48a7c5c4451deb642c164548a134bb9ad06

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-03-15 09:55:56 +01:00
parent 9cb9e67a8e
commit 258033d0b0
8 changed files with 116 additions and 77 deletions
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gpu/shaders/tile.h
+39
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@@ -14,6 +14,10 @@ struct TileSegRef {
uint offset;
};
struct TransformSegRef {
uint offset;
};
struct Path {
uvec4 bbox;
TileRef tiles;
@@ -49,6 +53,17 @@ TileSegRef TileSeg_index(TileSegRef ref, uint index) {
return TileSegRef(ref.offset + index * TileSeg_size);
}
struct TransformSeg {
vec4 mat;
vec2 translate;
};
#define TransformSeg_size 24
TransformSegRef TransformSeg_index(TransformSegRef ref, uint index) {
return TransformSegRef(ref.offset + index * TransformSeg_size);
}
Path Path_read(Alloc a, PathRef ref) {
uint ix = ref.offset >> 2;
uint raw0 = read_mem(a, ix + 0);
@@ -109,3 +124,27 @@ void TileSeg_write(Alloc a, TileSegRef ref, TileSeg s) {
write_mem(a, ix + 5, s.next.offset);
}
TransformSeg TransformSeg_read(Alloc a, TransformSegRef ref) {
uint ix = ref.offset >> 2;
uint raw0 = read_mem(a, ix + 0);
uint raw1 = read_mem(a, ix + 1);
uint raw2 = read_mem(a, ix + 2);
uint raw3 = read_mem(a, ix + 3);
uint raw4 = read_mem(a, ix + 4);
uint raw5 = read_mem(a, ix + 5);
TransformSeg s;
s.mat = vec4(uintBitsToFloat(raw0), uintBitsToFloat(raw1), uintBitsToFloat(raw2), uintBitsToFloat(raw3));
s.translate = vec2(uintBitsToFloat(raw4), uintBitsToFloat(raw5));
return s;
}
void TransformSeg_write(Alloc a, TransformSegRef ref, TransformSeg s) {
uint ix = ref.offset >> 2;
write_mem(a, ix + 0, floatBitsToUint(s.mat.x));
write_mem(a, ix + 1, floatBitsToUint(s.mat.y));
write_mem(a, ix + 2, floatBitsToUint(s.mat.z));
write_mem(a, ix + 3, floatBitsToUint(s.mat.w));
write_mem(a, ix + 4, floatBitsToUint(s.translate.x));
write_mem(a, ix + 5, floatBitsToUint(s.translate.y));
}