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donut: remove time-based degradation for consistent animation

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Remove three mechanisms that intentionally degraded the screensaver
over time, causing it to appear frozen after extended runtime:

- Brightness dimming curve (faded palette to 30% over ~15min)
- Projection framerate skip (reduced 3D updates from 24fps to 6fps)
- Deep sleep after 2hr (dropped to 1fps)

The clock drift and matrix text changes already provide adequate
OLED burn-in protection.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Andrejus
2026-03-18 15:30:59 +00:00
parent cccffa8fae
commit 107b9723d5
1 changed files with 3 additions and 19 deletions
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22
home/.tmux/donut.c
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@@ -296,11 +296,9 @@ int main(int argc, char **argv) {
int drift_ox = 0, drift_oy = 0; int drift_ox = 0, drift_oy = 0;
int clk_dx = 0, clk_dy = 0; int clk_dx = 0, clk_dy = 0;
int drift_tick = 0; int drift_tick = 0;
float last_dim = 1.0f;
struct timeval tv_prev; struct timeval tv_prev;
gettimeofday(&tv_prev, NULL); gettimeofday(&tv_prev, NULL);
float dt_scale = 1.0f; float dt_scale = 1.0f;
int frame_count = 0;
while (running) { while (running) {
gettimeofday(&tv_start, NULL); gettimeofday(&tv_start, NULL);
@@ -323,12 +321,6 @@ int main(int argc, char **argv) {
float elapsed_s = (tv_start.tv_sec - tv_boot.tv_sec) float elapsed_s = (tv_start.tv_sec - tv_boot.tv_sec)
+ (tv_start.tv_usec - tv_boot.tv_usec) / 1e6f; + (tv_start.tv_usec - tv_boot.tv_usec) / 1e6f;
float dim = 0.3f + 0.7f / (1.0f + elapsed_s / 900.0f);
if (fabsf(dim - last_dim) > 0.005f) {
init_palette(dim);
last_dim = dim;
}
int new_tick = (int)(elapsed_s / 180.0f); int new_tick = (int)(elapsed_s / 180.0f);
if (new_tick != drift_tick) { if (new_tick != drift_tick) {
drift_tick = new_tick; drift_tick = new_tick;
@@ -350,12 +342,8 @@ int main(int argc, char **argv) {
int sz = W * H; int sz = W * H;
/* Projection rate follows dim curve: bright=24fps → dim=6fps */ /* 3D projection */
int proj_skip = (int)((1.0f - dim) * 4.0f) + 1; {
if (proj_skip > 4) proj_skip = 4;
/* 3D projection at reduced rate — sbuf cached between updates */
if (frame_count % proj_skip == 0) {
float K2 = 5.0f; float K2 = 5.0f;
/* Cap projection to reference size — donut stays same size on any screen */ /* Cap projection to reference size — donut stays same size on any screen */
int proj_w = W < 160 ? W : 160; int proj_w = W < 160 ? W : 160;
@@ -454,7 +442,6 @@ int main(int argc, char **argv) {
} }
} }
} }
frame_count++;
/* Clock setup */ /* Clock setup */
time_t now = time(NULL); time_t now = time(NULL);
@@ -642,12 +629,9 @@ int main(int argc, char **argv) {
if (B > 6.2832f) B -= 6.2832f; if (B > 6.2832f) B -= 6.2832f;
if (B < 0.0f) B += 6.2832f; if (B < 0.0f) B += 6.2832f;
/* Fixed 24fps target — projection skip handles CPU curve */ /* Fixed 24fps target */
float target_ms = 41.6f; float target_ms = 41.6f;
/* Deep sleep after 2hr — dim bottomed out, select() blocks until keypress */
if (elapsed_s > 7200.0f) target_ms = 1000.0f; /* 1fps */
/* Sleep until deadline or keypress via select() */ /* Sleep until deadline or keypress via select() */
gettimeofday(&tv_end, NULL); gettimeofday(&tv_end, NULL);
float spent = (tv_end.tv_sec - tv_start.tv_sec) * 1000.0f float spent = (tv_end.tv_sec - tv_start.tv_sec) * 1000.0f