'use strict';

"use strict";
const tilingBit = {
  name: "tiling-bit",
  vertex: {
    header: (
      /* wgsl */
      `
            struct TilingUniforms {
                uMapCoord:mat3x3<f32>,
                uClampFrame:vec4<f32>,
                uClampOffset:vec2<f32>,
                uTextureTransform:mat3x3<f32>,
                uSizeAnchor:vec4<f32>
            };

            @group(2) @binding(0) var<uniform> tilingUniforms: TilingUniforms;
            @group(2) @binding(1) var uTexture: texture_2d<f32>;
            @group(2) @binding(2) var uSampler: sampler;
        `
    ),
    main: (
      /* wgsl */
      `
            uv = (tilingUniforms.uTextureTransform * vec3(uv, 1.0)).xy;

            position = (position - tilingUniforms.uSizeAnchor.zw) * tilingUniforms.uSizeAnchor.xy;
        `
    )
  },
  fragment: {
    header: (
      /* wgsl */
      `
            struct TilingUniforms {
                uMapCoord:mat3x3<f32>,
                uClampFrame:vec4<f32>,
                uClampOffset:vec2<f32>,
                uTextureTransform:mat3x3<f32>,
                uSizeAnchor:vec4<f32>
            };

            @group(2) @binding(0) var<uniform> tilingUniforms: TilingUniforms;
            @group(2) @binding(1) var uTexture: texture_2d<f32>;
            @group(2) @binding(2) var uSampler: sampler;
        `
    ),
    main: (
      /* wgsl */
      `

            var coord = vUV + ceil(tilingUniforms.uClampOffset - vUV);
            coord = (tilingUniforms.uMapCoord * vec3(coord, 1.0)).xy;
            var unclamped = coord;
            coord = clamp(coord, tilingUniforms.uClampFrame.xy, tilingUniforms.uClampFrame.zw);

            var bias = 0.;

            if(unclamped.x == coord.x && unclamped.y == coord.y)
            {
                bias = -32.;
            } 

            outColor = textureSampleBias(uTexture, uSampler, coord, bias);
        `
    )
  }
};
const tilingBitGl = {
  name: "tiling-bit",
  vertex: {
    header: (
      /* glsl */
      `
            uniform mat3 uTextureTransform;
            uniform vec4 uSizeAnchor;
        
        `
    ),
    main: (
      /* glsl */
      `
            uv = (uTextureTransform * vec3(aUV, 1.0)).xy;

            position = (position - uSizeAnchor.zw) * uSizeAnchor.xy;
        `
    )
  },
  fragment: {
    header: (
      /* glsl */
      `
            uniform sampler2D uTexture;
            uniform mat3 uMapCoord;
            uniform vec4 uClampFrame;
            uniform vec2 uClampOffset;
        `
    ),
    main: (
      /* glsl */
      `

        vec2 coord = vUV + ceil(uClampOffset - vUV);
        coord = (uMapCoord * vec3(coord, 1.0)).xy;
        vec2 unclamped = coord;
        coord = clamp(coord, uClampFrame.xy, uClampFrame.zw);
        
        outColor = texture(uTexture, coord, unclamped == coord ? 0.0 : -32.0);// lod-bias very negative to force lod 0
    
        `
    )
  }
};

exports.tilingBit = tilingBit;
exports.tilingBitGl = tilingBitGl;
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