Rewrite antialiasing downscale code

1 files changed, 12 insertions, 0 deletions

diff --git a/graphics.c b/graphics.c
index bb800ad..e46dca5 100755
--- a/graphics.c
+++ b/graphics.c
@@ -961,6 +961,18 @@ vec4_f32 vec4_f32_lerp(vec4_f32 a, vec4_f32 b, f32 t) {
 
 //  ================================================================
 
+static f64 gamma_(f64 x) {
+  if (x >= 0.0031308)
+    return 1.055 * pow(x, 1.0 / 2.4) - 0.055;
+  return 12.92 * x;
+}
+
+static f64 gamma_re_(f64 x) {
+  if (x >= 0.04045)
+    return pow((x + 0.055) / 1.055, 2.4);
+  return x / 12.92;
+}
+
 vec3_f32 rgb_gamma_add(vec3_f32 rgb) {
   return (vec3_f32) {
     .x = (f32) gamma_(rgb.x),