export default {
    
    attributes: ['uv', 'position'],

    uniforms: ['view', 'projection', 'world', 
        'isYUV', 'focal_width_height', 'texture_video'],

    defines: ["#define SHADOWFULLFLOAT", "#define NUM_BONE_INFLUENCERS 0", "#define NUM_MORPH_INFLUENCERS 0"],

    samplers: ['shadowSampler', 'texture_video'],

    vertex: 
    `

        precision highp float;

        varying vec3 ModelPos;
        
        attribute vec2 uv;
        attribute vec3 position;
        
        uniform mat4 view;
        uniform mat4 projection;
        
        uniform mat4 world;

        void main()
        {
            ModelPos = vec3( view * world * vec4(position , 1.0));
            gl_Position = projection * view * world * vec4(position , 1.0); 
        }

    `,

    fragment: `

        precision highp  float;

        varying vec3 ModelPos;
        
        uniform float isYUV;  // false: 0, true: 1.0
        uniform sampler2D texture_video;
        
        uniform vec3 focal_width_height;
        
        vec2 SampleTex(vec3 pt3d)
        {
            return focal_width_height.x / focal_width_height.yz * pt3d.xy / pt3d.z + 0.5;
        }
        
        void main()
        {
            vec3 color = vec3(0,0,0);
            float shadow = 1.0;
            
            vec2 uv =  SampleTex( normalize(ModelPos) );

            if( isYUV < 0.5 )
            {
                color = texture2D(texture_video, uv).rgb;
            }else{
                const mat4 YUV2RGB = mat4
                (
                    1.1643828125, 0, 1.59602734375, -.87078515625,
                    1.1643828125, -.39176171875, -.81296875, .52959375,
                    1.1643828125, 2.017234375, 0, -1.081390625,
                    0, 0, 0, 1
                );    
                
                vec4 result = vec4( 
                    texture2D( texture_video, vec2( uv.x,   uv.y * 0.666666 + 0.333333 ) ).x,
                    texture2D( texture_video, vec2( uv.x * 0.5,        uv.y * 0.333333 ) ).x, 
                    texture2D( texture_video, vec2( 0.5 + uv.x * 0.5,  uv.y * 0.333333 ) ).x,
                    1
                ) * YUV2RGB;  

                color = clamp(result.rgb, 0.0, 1.0); 
            }
            if( uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0 )
            {
                color = vec3(0,0,0);
            }
            gl_FragColor = vec4(shadow * color * 1.0, 1.0); 
        }
    `
}