+// #define Image_LinearFloatFromsRGBFloat(c) (((c) <= 0.04045f) ? (c) * (1.0f / 12.92f) : (float)pow(((c) + 0.055f)*(1.0f/1.055f), 2.4f))
+set rpn_sRGB_to_linear "dup 0.055 add 1.055 div 2.4 pow exch 12.92 div dup 0.0031308 gt when"
+// #define Image_sRGBFloatFromLinearFloat(c) (((c) < 0.0031308f) ? (c) * 12.92f : 1.055f * (float)pow((c), 1.0f/2.4f) - 0.055f)
+set rpn_linear_to_sRGB "dup 1.0 2.4 div pow 1.055 mul 0.055 sub exch 12.92 mul dup 0.04045 ge when"
+
+// -nosRGB to -sRGB sky shader conversion:
+//
+// q3map_sunExt 1 0.6875 0.375 340 25 47 0 16
+// ^^ elevation
+// ^^^ sunlight
+// q3map_skylight 110 3
+// ^^^ skylight
+//
+// With that, do (the last parameter is the ratio of skylight you assume hits
+// the surfaces, about 0.25 for inner surfaces near sky, about 1.00 on
+// terrain):
+// ]skybox_nosRGB_to_sRGB 340 47 110 0.25
+// rpn: still on stack: new_sunlight:
+// rpn: still on stack: 380.464142
+// rpn: still on stack: new_skylight:
+// rpn: still on stack: 9.32523632
+//
+// The equivalent -sRGB shader then will have:
+//
+// q3map_sunExt 1 0.6875 0.375 380.464142 25 47 0 16
+// q3map_skylight 9.32523632 3
+alias skybox_nosRGB_to_sRGB "rpn $3 402.123 $4 div div $rpn_sRGB_to_linear 402.123 $4 div mul /new_skylight: $3 402.123 $4 div div $1 256 div $2 0.017453 mul sin mul add $rpn_sRGB_to_linear $3 402.123 $4 div div $rpn_sRGB_to_linear sub 256 mul $2 0.017453 mul sin div /new_sunlight:"