sanspie
dae4bc19e1
Foundation for the aego engine. core/ errs, log, handle arena, mathx, clock, stats platform SDL3 backend plus a headless one, input state, events gpu device abstraction with gl33 and null backends vfs scheme-based virtual filesystem with overlay mounts engine builder, module registry, phase-ordered system loop, jobs demos basic, resize, input, headless; sandbox driver OpenGL bindings are generated into gpu/gl33/gl by tools/gen-gl.sh, so the module has no external dependencies.
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package clock
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import (
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"math"
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"testing"
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)
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func TestAccumulates(t *testing.T) {
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var s FixedStepper
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steps, alpha := s.Advance(1.0 / 120)
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if steps != 0 || math.Abs(alpha-0.5) > 1e-6 {
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t.Fatalf("first: steps=%d alpha=%f", steps, alpha)
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}
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steps, alpha = s.Advance(1.0 / 120)
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if steps != 1 || alpha > 1e-6 {
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t.Fatalf("second: steps=%d alpha=%f", steps, alpha)
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}
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}
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func TestNoSpiralAfterStall(t *testing.T) {
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var s FixedStepper
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steps, alpha := s.Advance(10)
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if steps != DefaultMaxSteps {
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t.Fatalf("steps=%d", steps)
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}
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if alpha < 0 || alpha >= 1 {
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t.Fatalf("alpha=%f", alpha)
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}
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steps, _ = s.Advance(0)
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if steps != 0 {
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t.Fatalf("backlog leaked into next frame: %d steps", steps)
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}
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}
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func TestNegativeAndNaN(t *testing.T) {
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var s FixedStepper
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if steps, _ := s.Advance(-1); steps != 0 {
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t.Fatal("negative delta produced steps")
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}
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if steps, _ := s.Advance(math.NaN()); steps != 0 {
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t.Fatal("NaN delta produced steps")
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}
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}
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func TestLongRunStepCount(t *testing.T) {
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s := FixedStepper{FixedDelta: 1.0 / 50}
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total := 0
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for i := 0; i < 600; i++ {
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steps, alpha := s.Advance(1.0 / 60)
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if alpha < 0 || alpha >= 1 {
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t.Fatalf("alpha out of range: %f", alpha)
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}
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total += steps
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}
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if total < 499 || total > 500 {
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t.Fatalf("total steps=%d", total)
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}
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}
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