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gpu/shaders: fix GPU hang

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This is a port of https://github.com/linebender/piet-gpu/pull/108.

Updates gio#214
Updates gio#219

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-07-19 19:14:50 +02:00
parent 62a8b80c81
commit 4f40b58e0d
2 changed files with 62 additions and 59 deletions
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gpu/shaders/path_coarse.comp
+5 -1
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@@ -30,6 +30,7 @@ layout(set = 0, binding = 1) readonly buffer ConfigBuf {
#define Q_ACCURACY (ACCURACY * 0.1)
#define REM_ACCURACY (ACCURACY - Q_ACCURACY)
#define MAX_HYPOT2 (432.0 * Q_ACCURACY * Q_ACCURACY)
#define MAX_QUADS 16
vec2 eval_quad(vec2 p0, vec2 p1, vec2 p2, float t) {
float mt = 1.0 - t;
@@ -113,6 +114,8 @@ void main() {
float err = err_v.x * err_v.x + err_v.y * err_v.y;
// The number of quadratics.
uint n_quads = max(uint(ceil(pow(err * (1.0 / MAX_HYPOT2), 1.0 / 6.0))), 1);
n_quads = min(n_quads, MAX_QUADS);
SubdivResult keep_params[MAX_QUADS];
// Iterate over quadratics and tote up the estimated number of segments.
float val = 0.0;
vec2 qp0 = cubic.p0;
@@ -123,6 +126,7 @@ void main() {
vec2 qp1 = eval_cubic(cubic.p0, cubic.p1, cubic.p2, cubic.p3, t - 0.5 * step);
qp1 = 2.0 * qp1 - 0.5 * (qp0 + qp2);
SubdivResult params = estimate_subdiv(qp0, qp1, qp2, sqrt(REM_ACCURACY));
keep_params[i] = params;
val += params.val;
qp0 = qp2;
@@ -144,7 +148,7 @@ void main() {
vec2 qp2 = eval_cubic(cubic.p0, cubic.p1, cubic.p2, cubic.p3, t);
vec2 qp1 = eval_cubic(cubic.p0, cubic.p1, cubic.p2, cubic.p3, t - 0.5 * step);
qp1 = 2.0 * qp1 - 0.5 * (qp0 + qp2);
SubdivResult params = estimate_subdiv(qp0, qp1, qp2, sqrt(REM_ACCURACY));
SubdivResult params = keep_params[i];
float u0 = approx_parabola_inv_integral(params.a0);
float u2 = approx_parabola_inv_integral(params.a2);
float uscale = 1.0 / (u2 - u0);