Ports OpenSimplex2 from https://github.com/KdotJPG/OpenSimplex2 to Odin. Adds tests for the noise procedures.

1 files changed, 153 insertions, 0 deletions

diff --git a/tests/core/math/noise/test_core_math_noise.odin b/tests/core/math/noise/test_core_math_noise.odin
new file mode 100644
index 000000000..a3ac1b955
--- /dev/null
+++ b/tests/core/math/noise/test_core_math_noise.odin
@@ -0,0 +1,153 @@
+package test_core_math_noise
+
+import "core:testing"
+import "core:math/noise"
+import "core:fmt"
+
+TEST_count := 0
+TEST_fail  := 0
+
+V2 :: noise.Vec2
+V3 :: noise.Vec3
+V4 :: noise.Vec4
+
+when ODIN_TEST {
+    expect  :: testing.expect
+    log     :: testing.log
+} else {
+    expect  :: proc(t: ^testing.T, condition: bool, message: string, loc := #caller_location) {
+        fmt.printf("[%v] ", loc)
+        TEST_count += 1
+        if !condition {
+            TEST_fail += 1
+            fmt.println(message)
+            return
+        }
+        fmt.println(" PASS")
+    }
+    log     :: proc(t: ^testing.T, v: any, loc := #caller_location) {
+        fmt.printf("[%v] ", loc)
+        fmt.printf("log: %v\n", v)
+    }
+}
+
+main :: proc() {
+	t := testing.T{}
+	noise_test(&t)
+	fmt.printf("%v/%v tests successful.\n", TEST_count - TEST_fail, TEST_count)
+}
+
+Test_Vector :: struct {
+	seed:      i64,
+	coord:     union {V2, V3, V4},
+	expected:  f32,
+
+	test_proc: union {
+		proc(_: i64, _: V2) -> f32,
+		proc(_: i64, _: V3) -> f32,
+		proc(_: i64, _: V4) -> f32,
+	},
+}
+
+SEED_1 :: 2324223232
+SEED_2 :: 932466901
+SEED_3 :: 9321
+
+COORD_1 :: V4{  242.0,  3433.0,      920.0,    222312.0}
+COORD_2 :: V4{  590.0,  9411.0,     5201.0, 942124256.0}
+COORD_3 :: V4{12090.0, 19411.0, 81950901.0,   4224219.0}
+
+Noise_Tests := []Test_Vector{
+	/*
+		`noise_2d` tests.
+	*/
+	{SEED_1, COORD_1.xy,   0.25010583,  noise.noise_2d},
+	{SEED_2, COORD_2.xy,  -0.92513955,  noise.noise_2d},
+	{SEED_3, COORD_3.xy,   0.67327416,  noise.noise_2d},
+
+	/*
+		`noise_2d_improve_x` tests.
+	*/
+	{SEED_1, COORD_1.xy,   0.17074019,  noise.noise_2d_improve_x},
+	{SEED_2, COORD_2.xy,   0.72330487,  noise.noise_2d_improve_x},
+	{SEED_3, COORD_3.xy,  -0.032076947, noise.noise_2d_improve_x},
+
+	/*
+		`noise_3d_improve_xy` tests.
+	*/
+	{SEED_1, COORD_1.xyz,  0.14819577,  noise.noise_3d_improve_xy},
+	{SEED_2, COORD_2.xyz, -0.065345764, noise.noise_3d_improve_xy},
+	{SEED_3, COORD_3.xyz, -0.37761918,  noise.noise_3d_improve_xy},
+
+	/*
+		`noise_3d_improve_xz` tests.
+	*/
+	{SEED_1, COORD_1.xyz, -0.50075006,  noise.noise_3d_improve_xz},
+	{SEED_2, COORD_2.xyz, -0.36039603,  noise.noise_3d_improve_xz},
+	{SEED_3, COORD_3.xyz, -0.3479203,   noise.noise_3d_improve_xz},
+
+	/*
+		`noise_3d_fallback` tests.
+	*/
+	{SEED_1, COORD_1.xyz,  0.6557345,   noise.noise_3d_fallback},
+	{SEED_2, COORD_2.xyz,  0.55452216,  noise.noise_3d_fallback},
+	{SEED_3, COORD_3.xyz, -0.26408964,  noise.noise_3d_fallback},
+
+	/*
+		`noise_3d_fallback` tests.
+	*/
+	{SEED_1, COORD_1.xyz,  0.6557345,   noise.noise_3d_fallback},
+	{SEED_2, COORD_2.xyz,  0.55452216,  noise.noise_3d_fallback},
+	{SEED_3, COORD_3.xyz, -0.26408964,  noise.noise_3d_fallback},
+
+	/*
+		`noise_4d_improve_xyz_improve_xy` tests.
+	*/
+	{SEED_1, COORD_1,      0.44929826,  noise.noise_4d_improve_xyz_improve_xy},
+	{SEED_2, COORD_2,     -0.13270882,  noise.noise_4d_improve_xyz_improve_xy},
+	{SEED_3, COORD_3,      0.10298563,  noise.noise_4d_improve_xyz_improve_xy},
+
+	/*
+		`noise_4d_improve_xyz_improve_xz` tests.
+	*/
+	{SEED_1, COORD_1,    -0.078514606,  noise.noise_4d_improve_xyz_improve_xz},
+	{SEED_2, COORD_2,    -0.032157656,  noise.noise_4d_improve_xyz_improve_xz},
+	{SEED_3, COORD_3,     -0.38607058,  noise.noise_4d_improve_xyz_improve_xz},
+
+	/*
+		`noise_4d_improve_xyz` tests.
+	*/
+	{SEED_1, COORD_1,      -0.4442258,  noise.noise_4d_improve_xyz},
+	{SEED_2, COORD_2,      0.36822623,  noise.noise_4d_improve_xyz},
+	{SEED_3, COORD_3,      0.22628775,  noise.noise_4d_improve_xyz},
+
+	/*
+		`noise_4d_fallback` tests.
+	*/
+	{SEED_1, COORD_1,     -0.14233987,  noise.noise_4d_fallback},
+	{SEED_2, COORD_2,      0.1354035,  noise.noise_4d_fallback},
+	{SEED_3, COORD_3,      0.14565045,  noise.noise_4d_fallback},
+
+	// TODO: Output according to C# - Figure out which of these two is right (and why).
+	// {SEED_1, COORD_1,     -0.14233987,  noise.noise_4d_fallback},
+	// {SEED_2, COORD_2,      0.1354035,   noise.noise_4d_fallback},
+	// {SEED_3, COORD_3,      0.14565045,  noise.noise_4d_fallback},
+}
+
+noise_test :: proc(t: ^testing.T) {
+	for test in Noise_Tests {
+		output: f32
+
+		switch coord in test.coord {
+		case V2:
+			output = test.test_proc.(proc(_: i64, _: V2) -> f32)(test.seed, test.coord.(V2))
+		case V3:
+			output = test.test_proc.(proc(_: i64, _: V3) -> f32)(test.seed, test.coord.(V3))
+		case V4:
+			output = test.test_proc.(proc(_: i64, _: V4) -> f32)(test.seed, test.coord.(V4))
+		}
+	
+		error  := fmt.tprintf("Seed %v, Coord: %v, Expected: %3.8f. Got %3.8f", test.seed, test.coord, test.expected, output)
+		expect(t, test.expected == output, error)
+	}
+}
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