Remove some unneeded conversions from ResampleEffect. Speeds up texture generation...

[movit] / ycbcr_conversion_effect.frag

diff --git a/ycbcr_conversion_effect.frag b/ycbcr_conversion_effect.frag
index 6bc29b1be63782bcd950f3dd451256a2caedb8f0..ef289df8fa34dc35ddf74858d8a351227b96de12 100644 (file)
--- a/ycbcr_conversion_effect.frag
+++ b/ycbcr_conversion_effect.frag
@@ -1,24 +1,38 @@
+// See footer.frag for details about this if statement.
+#ifndef YCBCR_ALSO_OUTPUT_RGBA
+#define YCBCR_ALSO_OUTPUT_RGBA 0
+#endif
+
 uniform sampler2D PREFIX(tex_y);
 uniform sampler2D PREFIX(tex_cb);
 uniform sampler2D PREFIX(tex_cr);
 
+#if YCBCR_ALSO_OUTPUT_RGBA
+vec4[2] FUNCNAME(vec2 tc) {
+#else
 vec4 FUNCNAME(vec2 tc) {
+#endif
        vec4 rgba = INPUT(tc);
        vec4 ycbcr_a;
 
        ycbcr_a.rgb = PREFIX(ycbcr_matrix) * rgba.rgb + PREFIX(offset);
 
-#if YCBCR_CLAMP_RANGE
-       // If we use limited-range Y'CbCr, the card's usual 0–255 clamping
-       // won't be enough, so we need to clamp ourselves here.
-       //
-       // We clamp before dither, which is a bit unfortunate, since
-       // it means dither can take us out of the clamped range again.
-       // However, since DitherEffect never adds enough dither to change
-       // the quantized levels, we will be fine in practice.
-       ycbcr_a.rgb = clamp(ycbcr_a.rgb, PREFIX(ycbcr_min), PREFIX(ycbcr_max));
-#endif
+       if (PREFIX(clamp_range)) {
+               // If we use limited-range Y'CbCr, the card's usual 0–255 clamping
+               // won't be enough, so we need to clamp ourselves here.
+               //
+               // We clamp before dither, which is a bit unfortunate, since
+               // it means dither can take us out of the clamped range again.
+               // However, since DitherEffect never adds enough dither to change
+               // the quantized levels, we will be fine in practice.
+               ycbcr_a.rgb = clamp(ycbcr_a.rgb, PREFIX(ycbcr_min), PREFIX(ycbcr_max));
+       }
 
        ycbcr_a.a = rgba.a;
+
+#if YCBCR_ALSO_OUTPUT_RGBA
+       return vec4[2](ycbcr_a, rgba);
+#else
        return ycbcr_a;
+#endif
 }