1 files changed, 25 insertions, 0 deletions
diff --git a/test/gl_video.c b/test/gl_video.c
new file mode 100644
index 0000000..a2bdda4
--- /dev/null
+++ b/test/gl_video.c
@@ -0,0 +1,25 @@
+#include "test_utils.h"
+#include "video/out/gpu/utils.h"
+
+int main(void)
+{
+    float x;
+
+    x = gl_video_scale_ambient_lux(16.0, 64.0, 2.40, 1.961, 16.0);
+    assert_float_equal(x, 2.40f, FLT_EPSILON);
+
+    x = gl_video_scale_ambient_lux(16.0, 64.0, 2.40, 1.961, 64.0);
+    assert_float_equal(x, 1.961f, FLT_EPSILON);
+
+    x = gl_video_scale_ambient_lux(16.0, 64.0, 1.961, 2.40, 64.0);
+    assert_float_equal(x, 2.40f, FLT_EPSILON);
+
+    x = gl_video_scale_ambient_lux(16.0, 64.0, 2.40, 1.961, 0.0);
+    assert_float_equal(x, 2.40f, FLT_EPSILON);
+
+    // 32 corresponds to the midpoint after converting lux to the log10 scale
+    x = gl_video_scale_ambient_lux(16.0, 64.0, 2.40, 1.961, 32.0);
+    float mid_gamma = (2.40 - 1.961) / 2 + 1.961;
+    assert_float_equal(x, mid_gamma, FLT_EPSILON);
+    return 0;
+}