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path_coarse.comp: tighten variable scopes, delete unused variables

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No functional changes.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur 2020-12-01 17:59:37 +01:00
parent c50d3f17ea
commit 2068171f96
2 changed files with 13 additions and 17 deletions
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30
piet-gpu/shader/path_coarse.comp
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@ -101,12 +101,6 @@ void main() {
if (element_ix < n_pathseg) { if (element_ix < n_pathseg) {
tag = PathSeg_tag(ref); tag = PathSeg_tag(ref);
} }
// Setup for coverage algorithm.
float a, b, c;
// Bounding box of element in pixel coordinates.
float xmin, xmax, ymin, ymax;
PathStrokeLine line;
float dx;
switch (tag) { switch (tag) {
case PathSeg_FillCubic: case PathSeg_FillCubic:
case PathSeg_StrokeCubic: case PathSeg_StrokeCubic:
@ -162,22 +156,24 @@ void main() {
} }
// Output line segment // Output line segment
xmin = min(p0.x, p1.x) - cubic.stroke.x;
xmax = max(p0.x, p1.x) + cubic.stroke.x; // Bounding box of element in pixel coordinates.
ymin = min(p0.y, p1.y) - cubic.stroke.y; float xmin = min(p0.x, p1.x) - cubic.stroke.x;
ymax = max(p0.y, p1.y) + cubic.stroke.y; float xmax = max(p0.x, p1.x) + cubic.stroke.x;
float ymin = min(p0.y, p1.y) - cubic.stroke.y;
float ymax = max(p0.y, p1.y) + cubic.stroke.y;
float dx = p1.x - p0.x; float dx = p1.x - p0.x;
float dy = p1.y - p0.y; float dy = p1.y - p0.y;
// Set up for per-scanline coverage formula, below. // Set up for per-scanline coverage formula, below.
float invslope = abs(dy) < 1e-9 ? 1e9 : dx / dy; float invslope = abs(dy) < 1e-9 ? 1e9 : dx / dy;
c = (cubic.stroke.x + abs(invslope) * (0.5 * float(TILE_HEIGHT_PX) + cubic.stroke.y)) * SX; float c = (cubic.stroke.x + abs(invslope) * (0.5 * float(TILE_HEIGHT_PX) + cubic.stroke.y)) * SX;
b = invslope; // Note: assumes square tiles, otherwise scale. float b = invslope; // Note: assumes square tiles, otherwise scale.
a = (p0.x - (p0.y - 0.5 * float(TILE_HEIGHT_PX)) * b) * SX; float a = (p0.x - (p0.y - 0.5 * float(TILE_HEIGHT_PX)) * b) * SX;
int x0 = int(floor((xmin) * SX)); int x0 = int(floor(xmin * SX));
int x1 = int(ceil((xmax) * SX)); int x1 = int(ceil(xmax * SX));
int y0 = int(floor((ymin) * SY)); int y0 = int(floor(ymin * SY));
int y1 = int(ceil((ymax) * SY)); int y1 = int(ceil(ymax * SY));
x0 = clamp(x0, bbox.x, bbox.z); x0 = clamp(x0, bbox.x, bbox.z);
y0 = clamp(y0, bbox.y, bbox.w); y0 = clamp(y0, bbox.y, bbox.w);

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piet-gpu/shader/path_coarse.spv
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