YUV shader for Unity?

Question

I have some (proper, planar) YUV textures in Unity, and I just want to see them for dev use.

Is there actually a working YUV shader for Unity (their shader language variant) kicking around?

It's simple enough conceptually to convert from YUV to RGB .. but a bit fiddly.

As far I understand, you're looking for a YUV -> RGB Shader, right? — Hamid Yusifli, Jan 23 '19 at 18:01
thanks - well, basically yes. So it's a shader that will take a YUV-formatted texture .. and draw it. — Fattie, Jan 23 '19 at 19:44

score 5 · Accepted Answer · answered Jan 23 '19 at 19:58

YUV to RGB conversion shader:

 Shader "Hidden/YUVtoRGB"
    {
        Properties
        {
            _MainTex ("Texture", 2D) = "white" {}
        }
        SubShader
        {
            // No culling or depth
            Cull Off ZWrite Off ZTest Always

            Pass
            {
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag

                #include "UnityCG.cginc"

                struct appdata
                {
                    float4 vertex : POSITION;
                    float2 uv : TEXCOORD0;
                };

                struct v2f
                {
                    float2 uv : TEXCOORD0;
                    float4 vertex : SV_POSITION;
                };

                v2f vert (appdata v)
                {
                    v2f o;
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    o.uv = v.uv;
                    return o;
                }

                sampler2D _MainTex;


                fixed3 YUVtoRGB(fixed3 c)
                {
                    fixed3 rgb;
                    rgb.r = c.x + c.z * 1.13983;
                    rgb.g = c.x + dot(fixed2(-0.39465, -0.58060), c.yz);
                    rgb.b = c.x + c.y * 2.03211;
                    return rgb;
                }

                fixed4 frag (v2f i) : SV_Target
                {
                    fixed4 yuv = tex2D(_MainTex, i.uv);
                    fixed4 rgb = fixed4(YUVtoRGB(yuv.rgb), yuv.a);
                    return rgb;
                }
                ENDCG
            }
        }
    }

Ahh .. I see .. so you just do it in frag .......... fantastic! Totally awesome! — Fattie, Jan 24 '19 at 14:45
how is this shader meant to be used? I have YUV420p data which 12 bits per pixel. Is this shader intended for a different YUV format? — Troy, Nov 08 '19 at 18:00

Fattie · Answer 2 · 2019-02-03T17:06:04.950

Just for the sake of putting in an answer,

you can very simply use only the Y channel of YUV,

and you will get, exactly, a monochrome version of the image.

So, in abstract pseudocode terms, merely do something like this ..

uint32_t grayscale_from_y(uint8_t y)
    {
        // when we want to show a YUV texture on screen
        // for checking during development,
        // you can be super lazy and just feed
        // the "Y" to RGB upstream,
        // set R G and B to the Y value, something like this:

        uint32_t r = y;
        uint32_t g = y;
        uint32_t b = y;
        return r + (g << 8) + (b << 16) + 0xff000000;
        // (alpha is one there)
    }

it may help someone !

YUV shader for Unity?

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