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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/state.h
+5 -1
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@@ -14,9 +14,10 @@ struct State {
uint flags;
uint path_count;
uint pathseg_count;
uint trans_count;
};
#define State_size 56
#define State_size 60
StateRef State_index(StateRef ref, uint index) {
return StateRef(ref.offset + index * State_size);
@@ -38,6 +39,7 @@ State State_read(StateRef ref) {
uint raw11 = state[ix + 11];
uint raw12 = state[ix + 12];
uint raw13 = state[ix + 13];
uint raw14 = state[ix + 14];
State s;
s.mat = vec4(uintBitsToFloat(raw0), uintBitsToFloat(raw1), uintBitsToFloat(raw2), uintBitsToFloat(raw3));
s.translate = vec2(uintBitsToFloat(raw4), uintBitsToFloat(raw5));
@@ -46,6 +48,7 @@ State State_read(StateRef ref) {
s.flags = raw11;
s.path_count = raw12;
s.pathseg_count = raw13;
s.trans_count = raw14;
return s;
}
@@ -65,5 +68,6 @@ void State_write(StateRef ref, State s) {
state[ix + 11] = s.flags;
state[ix + 12] = s.path_count;
state[ix + 13] = s.pathseg_count;
state[ix + 14] = s.trans_count;
}