Add a mode for YCbCrInput where Cb and Cr are in the same texture.

[movit] / ycbcr_input.frag

diff --git a/ycbcr_input.frag b/ycbcr_input.frag
index b84499d4408b4c1a97ce41785f4e7104573b7ebb..c57c6d184441445d57b1d0892f83dfc059383eec 100644 (file)
--- a/ycbcr_input.frag
+++ b/ycbcr_input.frag
@@ -1,7 +1,8 @@
 // Implicit uniforms:
 // uniform sampler2D PREFIX(tex_y);
-// uniform sampler2D PREFIX(tex_cb);
-// uniform sampler2D PREFIX(tex_cr);
+// uniform sampler2D PREFIX(tex_cbcr);  // If CB_CR_SAME_TEXTURE.
+// uniform sampler2D PREFIX(tex_cb);    // If not CB_CR_SAME_TEXTURE.
+// uniform sampler2D PREFIX(tex_cr);    // If not CB_CR_SAME_TEXTURE.
 
 vec4 FUNCNAME(vec2 tc) {
        // OpenGL's origin is bottom-left, but most graphics software assumes
@@ -11,8 +12,17 @@ vec4 FUNCNAME(vec2 tc) {
 
        vec3 ycbcr;
        ycbcr.x = tex2D(PREFIX(tex_y), tc).x;
+#if CB_CR_SAME_TEXTURE
+#if CB_CR_OFFSETS_EQUAL
+       ycbcr.yz = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cb_offset)).xy;
+#else
+       ycbcr.y = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cb_offset)).x;
+       ycbcr.z = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cr_offset)).x;
+#endif
+#else
        ycbcr.y = tex2D(PREFIX(tex_cb), tc + PREFIX(cb_offset)).x;
        ycbcr.z = tex2D(PREFIX(tex_cr), tc + PREFIX(cr_offset)).x;
+#endif
 
        ycbcr -= PREFIX(offset);