Add an effect for 4:2:2 interleaved YCbCr input (UYVY).

[movit] / ycbcr_422interleaved_input.frag

diff --git a/ycbcr_422interleaved_input.frag b/ycbcr_422interleaved_input.frag
new file mode 100644 (file)
index 0000000..66762a8
--- /dev/null
+++ b/ycbcr_422interleaved_input.frag
@@ -0,0 +1,32 @@
+uniform sampler2D PREFIX(tex_y);
+uniform sampler2D PREFIX(tex_cbcr);
+
+vec4 FUNCNAME(vec2 tc) {
+       // OpenGL's origin is bottom-left, but most graphics software assumes
+       // a top-left origin. Thus, for inputs that come from the user,
+       // we flip the y coordinate.
+       tc.y = 1.0 - tc.y;
+
+       vec3 ycbcr;
+       ycbcr.x = tex2D(PREFIX(tex_y), tc).y;
+#if CB_CR_OFFSETS_EQUAL
+       vec2 tc_cbcr = tc;
+       tc_cbcr.x += PREFIX(cb_offset_x);
+       ycbcr.yz = tex2D(PREFIX(tex_cbcr), tc_cbcr).xz;
+#else
+       vec2 tc_cb = tc;
+       tc_cb.x += PREFIX(cb_offset_x);
+       ycbcr.y = tex2D(PREFIX(tex_cbcr), tc_cb).x;
+
+       vec2 tc_cr = tc;
+       tc_cr.x += PREFIX(cr_offset_x);
+       ycbcr.z = tex2D(PREFIX(tex_cbcr), tc_cr).z;
+#endif
+
+       ycbcr -= PREFIX(offset);
+
+       vec4 rgba;
+       rgba.rgb = PREFIX(inv_ycbcr_matrix) * ycbcr;
+       rgba.a = 1.0;
+       return rgba;
+}