/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
import { util } from '@tensorflow/tfjs-core';
import { useShapeUniforms } from './gpgpu_math';
export class DepthwiseConvPacked2DProgram {
    constructor(convInfo, addBias = false, activation = null, hasPreluActivation = false, hasLeakyReluAlpha = false) {
        this.variableNames = ['x', 'W'];
        this.packedInputs = true;
        this.packedOutput = true;
        this.customUniforms = [
            { name: 'pads', type: 'ivec2' },
            { name: 'strides', type: 'ivec2' },
            { name: 'dilations', type: 'ivec2' },
            { name: 'inDims', type: 'ivec2' },
        ];
        this.outputShape = convInfo.outShape;
        this.enableShapeUniforms = useShapeUniforms(this.outputShape.length);
        const channelMul = convInfo.outChannels / convInfo.inChannels;
        const padLeft = convInfo.padInfo.left;
        const strideWidth = convInfo.strideWidth;
        const dilationWidth = convInfo.dilationWidth;
        const filterHeight = convInfo.filterHeight;
        const filterWidth = convInfo.filterWidth;
        const texelsAcross = filterWidth;
        let mainLoop = `
      int xR; int xC; int xCOffset;
      vec4 wTexel; vec4 previous; vec4 final;`;
        for (let c = 0; c < filterWidth; c++) {
            mainLoop += `
          vec4 xTexelC${c * 2};
          int xTexelC${c * 2}Ready;
          vec4 xTexelC${c * 2 + 1};
          int xTexelC${c * 2 + 1}Ready;
          vec4 xC${c};`;
        }
        /**
         * This vectorized implementation works by gathering the values needed for
         * each output channel's dot product into vec4's and then multiplying them
         * all together (this happens in the final double for-loop below). Most of
         * the main loop consists of constructing these vec4's with the minimum
         * number of texture2D calls, which means making use of all four returned
         * values from a texture2D call at once.
         */
        mainLoop += `
    for (int r = 0; r < ${filterHeight}; r++) {
      `;
        for (let c = 0; c < filterWidth; c++) {
            mainLoop += `
          xTexelC${c * 2} = vec4(0.0);
          xTexelC${c * 2}Ready = 0;
          xTexelC${c * 2 + 1} = vec4(0.0);
          xTexelC${c * 2 + 1}Ready = 0;
          xC${c} = vec4(0.0);`;
        }
        mainLoop += `
        xR = xRCorner + r * dilations[0];
        if (xR >=0 && xR < inDims[0]) {
      `;
        for (let texelC = 0; texelC < (texelsAcross + 1) / 2; texelC++) {
            const colIndex = texelC * 2;
            mainLoop += `
          xC = xCCorner + ${colIndex * dilationWidth};
          `;
            if (strideWidth === 1) {
                if (colIndex < filterWidth) {
                    // If padding is odd, the outer texels have to be composed.
                    if (padLeft % 2 === 1) {
                        // TODO: Ensure vec4 previous does not result in redundant sample,
                        // and avoid setting xTexelRC's that exceed the boundary in the
                        // first place rather than resetting them to vec4(0)).
                        // To compute xCOffset:
                        // - If padding is odd, we must add 1 to ensure we ask for an
                        // even-numbered row.
                        // - We subtract 2 to access the previous texel.
                        mainLoop += `
                xCOffset = xC + 1;
                if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${colIndex}Ready == 0) {
                  xTexelC${colIndex} = getX(batch, xR, xCOffset, d1);

                  // Need to manually clear unused channels in case
                  // we're reading from recycled texture.
                  if (xCOffset + 1 >= inDims[1]) {
                    xTexelC${colIndex}.zw = vec2(0.0);
                  }
                  xTexelC${colIndex}Ready = 1;
                }
              `;
                        // This texel has been read in previous iteration if the dilation
                        // is 1.
                        if (dilationWidth === 1 && colIndex > 0) {
                            mainLoop += `
                xC${colIndex} = vec4(xTexelC${colIndex - 2}.zw, xTexelC${colIndex}.xy);
                `;
                        }
                        else {
                            mainLoop += `
                  xCOffset = xC + 1 - 2;

                  if (xCOffset >= 0 && xCOffset < inDims[1]) {
                    previous = getX(batch, xR, xCOffset, d1);

                    // Need to manually clear unused channels in case
                    // we're reading from recycled texture.
                    if (xCOffset + 1 >= inDims[1]) {
                      previous.zw = vec2(0.0);
                    }

                    xC${colIndex} = vec4(previous.zw, xTexelC${colIndex}.xy);
                  } else {
                    xC${colIndex} = vec4(0.0, 0.0, xTexelC${colIndex}.xy);
                  }
                  `;
                        }
                    }
                    else {
                        // Padding is even, so xRC corresponds to a single texel.
                        mainLoop += `
                if (xC >= 0 && xC < inDims[1] && xTexelC${colIndex}Ready == 0) {
                  xTexelC${colIndex} = getX(batch, xR, xC, d1);
                  if (xC + 1 >= inDims[1]) {
                    xTexelC${colIndex}.zw = vec2(0.0);
                  }
                  xTexelC${colIndex}Ready = 1;
                }

                xC${colIndex} = xTexelC${colIndex};
                `;
                    }
                    if (colIndex + 1 < filterWidth) {
                        // If dilation is even, the second entry should match the first
                        // (either both are composed or both are single samples). But if
                        // dilation is odd, then the second entry should be the opposite
                        // of the first (if the first is composed, the second is a single
                        // sample, and vice versa.)
                        const nextTexelOffset = padLeft % 2 === 0 ?
                            util.nearestLargerEven(dilationWidth) :
                            dilationWidth;
                        if ((dilationWidth % 2 === 0 && padLeft % 2 === 1) ||
                            (dilationWidth % 2 !== 0 && padLeft % 2 !== 1)) {
                            mainLoop += `
                  xCOffset = xC + imod(pads[1], 2) + ${nextTexelOffset};

                  if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${colIndex + 1}Ready == 0) {
                    xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);

                    // Need to manually clear unused channels in case
                    // we're reading from recycled texture.
                    if (xCOffset + 1 >= inDims[1]) {
                      xTexelC${colIndex + 1}.zw = vec2(0.0);
                    }
                    xTexelC${colIndex + 1}Ready = 1;
                  }
                  `;
                            // If dilation > 1 then the xRC's will not be able to share any
                            // values, so each xRC will require two unique calls to getX.
                            if (dilationWidth > 1) {
                                mainLoop += `
                    xCOffset -= 2;
                    if (xCOffset >= 0 && xCOffset < inDims[1]) {
                     previous = getX(batch, xR, xCOffset, d1);
                     xC${colIndex + 1} = vec4(previous.zw, xTexelC${colIndex + 1}.xy);
                    } else {
                     xC${colIndex + 1} = vec4(0.0, 0.0, xTexelC${colIndex + 1}.xy);
                    }
                    `;
                            }
                            else {
                                mainLoop += `
                    xC${colIndex + 1} = vec4(xTexelC${colIndex}.zw, xTexelC${colIndex + 1}.xy);
                    `;
                            }
                        }
                        else {
                            // If dilation is 1 and padding is odd, we have already read the
                            // texel when constructing the previous x value. Here we can
                            // simply skip the texture read.
                            if (nextTexelOffset === 1) {
                                mainLoop += `
                    xC${colIndex + 1} = xTexelC${colIndex};
                    `;
                            }
                            else {
                                mainLoop += `
                    xCOffset = xC + ${nextTexelOffset};

                    if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${colIndex + 1}Ready == 0) {
                      xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);
                      if (xCOffset + 1 >= inDims[1]) {
                        xTexelC${colIndex + 1}.zw = vec2(0.0);
                      }
                      xTexelC${colIndex + 1}Ready = 1;
                    }

                    xC${colIndex + 1} = xTexelC${colIndex + 1};
                    `;
                            }
                        }
                    }
                }
            }
            else { // stride === 2
                if (colIndex < filterWidth) {
                    // Depending on whether padLeft is even or odd, we want either the
                    // xy or zw channels from X texels for xC${colIndex}. If padLeft is
                    // even, xC${colIndex +1} is simply the zw channels of texels we've
                    // already sampled. But if padLeft is odd, xC{$c + 1}.zw will
                    // need to come from the xy channels of a new texel, hence the `
                    // vec4
                    // final` initialized below.
                    if (padLeft % 2 === 1) {
                        mainLoop += `
                xCOffset = xC + 1 - strides[1];
                if(xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${colIndex}Ready == 0) {
                  xTexelC${colIndex} = getX(batch, xR, xCOffset, d1);
                  // Need to manually clear unused channels in case
                  // we're reading from recycled texture.
                  if (xCOffset + 1 >= inDims[1]) {
                    xTexelC${colIndex}.zw = vec2(0.0);
                  }
                  xTexelC${colIndex}Ready = 1;
                }

                if(xC + 1 >= 0 && xC + 1 < inDims[1] && xTexelC${colIndex + 1}Ready == 0) {
                  xTexelC${colIndex + 1} = getX(batch, xR, xC + 1, d1);
                  // Need to manually clear unused channels in case
                  // we're reading from recycled texture.
                  if (xC + 2 >= inDims[1]) {
                    xTexelC${colIndex + 1}.zw = vec2(0.0);
                  }
                  xTexelC${colIndex + 1}Ready = 1;
                }

                xC${colIndex} = vec4(xTexelC${colIndex}.zw, xTexelC${colIndex + 1}.zw);
              `;
                        if (colIndex + 1 < filterWidth) {
                            mainLoop += `
                  final = vec4(0.0);
                  xCOffset = xC + 1 + strides[1];
                  if(xCOffset >= 0 && xCOffset < inDims[1]) {
                    final = getX(batch, xR, xCOffset, d1);
                  }
                  xC${colIndex + 1} = vec4(xTexelC${colIndex + 1}.xy, final.xy);
                `;
                        }
                    }
                    else {
                        mainLoop += `
                if(xC >= 0 && xC < inDims[1] && xTexelC${colIndex}Ready == 0) {
                  xTexelC${colIndex} = getX(batch, xR, xC, d1);
                  if (xC + 1 >= inDims[1]) {
                    xTexelC${colIndex}.zw = vec2(0.0);
                  }
                  xTexelC${colIndex}Ready = 1;
                }

                xCOffset = xC + strides[1];
                if(xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${colIndex + 1}Ready == 0) {
                  xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);
                  if (xCOffset + 1 >= inDims[1]) {
                    xTexelC${colIndex + 1}.zw = vec2(0.);
                  }
                  xTexelC${colIndex + 1}Ready = 1;
                }

                xC${colIndex} = vec4(
                  xTexelC${colIndex}.xy, xTexelC${colIndex + 1}.xy);
              `;
                        if (colIndex + 1 < filterWidth) {
                            mainLoop += `
                  xC${colIndex + 1} = vec4(xTexelC${colIndex}.zw, xTexelC${colIndex + 1}.zw);
                `;
                        }
                    }
                }
            }
            // localize the dotProd accumulation within the loop, the theory is for
            // GPU with limited cache, accumulate sum across large amount of
            // veriables will cause lots of cache misses. (i.e. 5x5 filter will have
            // 50 variables)
            if (colIndex < filterWidth) {
                mainLoop += `
            wTexel = getW(r, ${colIndex}, d1, q);
            dotProd += xC${colIndex} * vec4(wTexel.xz, wTexel.xz);
          `;
                if (colIndex + 1 < filterWidth) {
                    mainLoop += `
              wTexel = getW(r, ${colIndex + 1}, d1, q);
              dotProd += xC${colIndex + 1} * vec4(wTexel.xz, wTexel.xz);
            `;
                }
            }
        }
        mainLoop += `
    }
  `;
        mainLoop += `
      }
    `;
        let activationSnippet = '', applyActivationSnippet = '';
        if (activation) {
            if (hasPreluActivation) {
                activationSnippet = `vec4 activation(vec4 a) {
          vec4 b = getPreluActivationWeightsAtOutCoords();
          ${activation}
        }`;
            }
            else if (hasLeakyReluAlpha) {
                activationSnippet = `vec4 activation(vec4 a) {
          vec4 b = getLeakyreluAlphaAtOutCoords();
          ${activation}
        }`;
            }
            else {
                activationSnippet = `vec4 activation(vec4 x) {
          ${activation}
        }`;
            }
            applyActivationSnippet = `result = activation(result);`;
        }
        const addBiasSnippet = addBias ? 'result += getBiasAtOutCoords();' : '';
        if (addBias) {
            this.variableNames.push('bias');
        }
        if (hasPreluActivation) {
            this.variableNames.push('preluActivationWeights');
        }
        if (hasLeakyReluAlpha) {
            this.variableNames.push('leakyreluAlpha');
        }
        this.userCode = `
      ${activationSnippet}

      void main() {
        ivec4 coords = getOutputCoords();
        int batch = coords.x;
        ivec2 xRCCorner = coords.yz * strides - pads;
        int d2 = coords.w;
        int d1 = d2 / ${channelMul};
        int q = d2 - d1 * ${channelMul};
        int xRCorner = xRCCorner.x;
        int xCCorner = xRCCorner.y;

        //intialize dotProd with a small epsilon seems to reduce GPU accuracy loss.
        vec4 dotProd = vec4(0.000000000000001);

        ${mainLoop}

        vec4 result = dotProd - vec4(0.000000000000001);
        ${addBiasSnippet}
        ${applyActivationSnippet}
        setOutput(result);
      }
    `;
    }
}
//# 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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {backend_util, util} from '@tensorflow/tfjs-core';\n\nimport {GPGPUProgram, useShapeUniforms} from './gpgpu_math';\n\nexport class DepthwiseConvPacked2DProgram implements GPGPUProgram {\n  variableNames = ['x', 'W'];\n  packedInputs = true;\n  packedOutput = true;\n  outputShape: number[];\n  userCode: string;\n  enableShapeUniforms: boolean;\n  customUniforms = [\n    {name: 'pads', type: 'ivec2' as const },\n    {name: 'strides', type: 'ivec2' as const },\n    {name: 'dilations', type: 'ivec2' as const },\n    {name: 'inDims', type: 'ivec2' as const },\n  ];\n\n  constructor(\n      convInfo: backend_util.Conv2DInfo, addBias = false,\n      activation: string = null, hasPreluActivation = false,\n      hasLeakyReluAlpha = false) {\n    this.outputShape = convInfo.outShape;\n    this.enableShapeUniforms = useShapeUniforms(this.outputShape.length);\n    const channelMul = convInfo.outChannels / convInfo.inChannels;\n    const padLeft = convInfo.padInfo.left;\n    const strideWidth = convInfo.strideWidth;\n    const dilationWidth = convInfo.dilationWidth;\n    const filterHeight = convInfo.filterHeight;\n    const filterWidth = convInfo.filterWidth;\n    const texelsAcross = filterWidth;\n\n    let mainLoop = `\n      int xR; int xC; int xCOffset;\n      vec4 wTexel; vec4 previous; vec4 final;`;\n\n    for (let c = 0; c < filterWidth; c++) {\n      mainLoop += `\n          vec4 xTexelC${c * 2};\n          int xTexelC${c * 2}Ready;\n          vec4 xTexelC${c * 2 + 1};\n          int xTexelC${c * 2 + 1}Ready;\n          vec4 xC${c};`;\n    }\n\n    /**\n     * This vectorized implementation works by gathering the values needed for\n     * each output channel's dot product into vec4's and then multiplying them\n     * all together (this happens in the final double for-loop below). Most of\n     * the main loop consists of constructing these vec4's with the minimum\n     * number of texture2D calls, which means making use of all four returned\n     * values from a texture2D call at once.\n     */\n    mainLoop += `\n    for (int r = 0; r < ${filterHeight}; r++) {\n      `;\n    for (let c = 0; c < filterWidth; c++) {\n      mainLoop += `\n          xTexelC${c * 2} = vec4(0.0);\n          xTexelC${c * 2}Ready = 0;\n          xTexelC${c * 2 + 1} = vec4(0.0);\n          xTexelC${c * 2 + 1}Ready = 0;\n          xC${c} = vec4(0.0);`;\n    }\n    mainLoop += `\n        xR = xRCorner + r * dilations[0];\n        if (xR >=0 && xR < inDims[0]) {\n      `;\n\n    for (let texelC = 0; texelC < (texelsAcross + 1) / 2; texelC++) {\n      const colIndex = texelC * 2;\n\n      mainLoop += `\n          xC = xCCorner + ${colIndex * dilationWidth};\n          `;\n\n      if (strideWidth === 1) {\n        if (colIndex < filterWidth) {\n          // If padding is odd, the outer texels have to be composed.\n          if (padLeft % 2 === 1) {\n            // TODO: Ensure vec4 previous does not result in redundant sample,\n            // and avoid setting xTexelRC's that exceed the boundary in the\n            // first place rather than resetting them to vec4(0)).\n\n            // To compute xCOffset:\n            // - If padding is odd, we must add 1 to ensure we ask for an\n            // even-numbered row.\n            // - We subtract 2 to access the previous texel.\n\n            mainLoop += `\n                xCOffset = xC + 1;\n                if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${\n                colIndex}Ready == 0) {\n                  xTexelC${colIndex} = getX(batch, xR, xCOffset, d1);\n\n                  // Need to manually clear unused channels in case\n                  // we're reading from recycled texture.\n                  if (xCOffset + 1 >= inDims[1]) {\n                    xTexelC${colIndex}.zw = vec2(0.0);\n                  }\n                  xTexelC${colIndex}Ready = 1;\n                }\n              `;\n            // This texel has been read in previous iteration if the dilation\n            // is 1.\n            if (dilationWidth === 1 && colIndex > 0) {\n              mainLoop += `\n                xC${colIndex} = vec4(xTexelC${colIndex - 2}.zw, xTexelC${\n                  colIndex}.xy);\n                `;\n            } else {\n              mainLoop += `\n                  xCOffset = xC + 1 - 2;\n\n                  if (xCOffset >= 0 && xCOffset < inDims[1]) {\n                    previous = getX(batch, xR, xCOffset, d1);\n\n                    // Need to manually clear unused channels in case\n                    // we're reading from recycled texture.\n                    if (xCOffset + 1 >= inDims[1]) {\n                      previous.zw = vec2(0.0);\n                    }\n\n                    xC${colIndex} = vec4(previous.zw, xTexelC${colIndex}.xy);\n                  } else {\n                    xC${colIndex} = vec4(0.0, 0.0, xTexelC${colIndex}.xy);\n                  }\n                  `;\n            }\n          } else {\n            // Padding is even, so xRC corresponds to a single texel.\n            mainLoop += `\n                if (xC >= 0 && xC < inDims[1] && xTexelC${colIndex}Ready == 0) {\n                  xTexelC${colIndex} = getX(batch, xR, xC, d1);\n                  if (xC + 1 >= inDims[1]) {\n                    xTexelC${colIndex}.zw = vec2(0.0);\n                  }\n                  xTexelC${colIndex}Ready = 1;\n                }\n\n                xC${colIndex} = xTexelC${colIndex};\n                `;\n          }\n\n          if (colIndex + 1 < filterWidth) {\n            // If dilation is even, the second entry should match the first\n            // (either both are composed or both are single samples). But if\n            // dilation is odd, then the second entry should be the opposite\n            // of the first (if the first is composed, the second is a single\n            // sample, and vice versa.)\n\n            const nextTexelOffset = padLeft % 2 === 0 ?\n                util.nearestLargerEven(dilationWidth) :\n                dilationWidth;\n\n            if ((dilationWidth % 2 === 0 && padLeft % 2 === 1) ||\n                (dilationWidth % 2 !== 0 && padLeft % 2 !== 1)) {\n              mainLoop += `\n                  xCOffset = xC + imod(pads[1], 2) + ${nextTexelOffset};\n\n                  if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${\n                  colIndex + 1}Ready == 0) {\n                    xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);\n\n                    // Need to manually clear unused channels in case\n                    // we're reading from recycled texture.\n                    if (xCOffset + 1 >= inDims[1]) {\n                      xTexelC${colIndex + 1}.zw = vec2(0.0);\n                    }\n                    xTexelC${colIndex + 1}Ready = 1;\n                  }\n                  `;\n\n              // If dilation > 1 then the xRC's will not be able to share any\n              // values, so each xRC will require two unique calls to getX.\n              if (dilationWidth > 1) {\n                mainLoop += `\n                    xCOffset -= 2;\n                    if (xCOffset >= 0 && xCOffset < inDims[1]) {\n                     previous = getX(batch, xR, xCOffset, d1);\n                     xC${colIndex + 1} = vec4(previous.zw, xTexelC${\n                       colIndex + 1}.xy);\n                    } else {\n                     xC${colIndex + 1} = vec4(0.0, 0.0, xTexelC${\n                       colIndex + 1}.xy);\n                    }\n                    `;\n              } else {\n                mainLoop += `\n                    xC${colIndex + 1} = vec4(xTexelC${colIndex}.zw, xTexelC${\n                    colIndex + 1}.xy);\n                    `;\n              }\n            } else {\n              // If dilation is 1 and padding is odd, we have already read the\n              // texel when constructing the previous x value. Here we can\n              // simply skip the texture read.\n              if (nextTexelOffset === 1) {\n                mainLoop += `\n                    xC${colIndex + 1} = xTexelC${colIndex};\n                    `;\n              } else {\n                mainLoop += `\n                    xCOffset = xC + ${nextTexelOffset};\n\n                    if (xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${\n                    colIndex + 1}Ready == 0) {\n                      xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);\n                      if (xCOffset + 1 >= inDims[1]) {\n                        xTexelC${colIndex + 1}.zw = vec2(0.0);\n                      }\n                      xTexelC${colIndex + 1}Ready = 1;\n                    }\n\n                    xC${colIndex + 1} = xTexelC${colIndex + 1};\n                    `;\n              }\n            }\n          }\n        }\n      } else {  // stride === 2\n        if (colIndex < filterWidth) {\n          // Depending on whether padLeft is even or odd, we want either the\n          // xy or zw channels from X texels for xC${colIndex}. If padLeft is\n          // even, xC${colIndex +1} is simply the zw channels of texels we've\n          // already sampled. But if padLeft is odd, xC{$c + 1}.zw will\n          // need to come from the xy channels of a new texel, hence the `\n          // vec4\n          // final` initialized below.\n          if (padLeft % 2 === 1) {\n            mainLoop += `\n                xCOffset = xC + 1 - strides[1];\n                if(xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${\n                colIndex}Ready == 0) {\n                  xTexelC${colIndex} = getX(batch, xR, xCOffset, d1);\n                  // Need to manually clear unused channels in case\n                  // we're reading from recycled texture.\n                  if (xCOffset + 1 >= inDims[1]) {\n                    xTexelC${colIndex}.zw = vec2(0.0);\n                  }\n                  xTexelC${colIndex}Ready = 1;\n                }\n\n                if(xC + 1 >= 0 && xC + 1 < inDims[1] && xTexelC${\n                colIndex + 1}Ready == 0) {\n                  xTexelC${colIndex + 1} = getX(batch, xR, xC + 1, d1);\n                  // Need to manually clear unused channels in case\n                  // we're reading from recycled texture.\n                  if (xC + 2 >= inDims[1]) {\n                    xTexelC${colIndex + 1}.zw = vec2(0.0);\n                  }\n                  xTexelC${colIndex + 1}Ready = 1;\n                }\n\n                xC${colIndex} = vec4(xTexelC${colIndex}.zw, xTexelC${\n                colIndex + 1}.zw);\n              `;\n\n            if (colIndex + 1 < filterWidth) {\n              mainLoop += `\n                  final = vec4(0.0);\n                  xCOffset = xC + 1 + strides[1];\n                  if(xCOffset >= 0 && xCOffset < inDims[1]) {\n                    final = getX(batch, xR, xCOffset, d1);\n                  }\n                  xC${colIndex + 1} = vec4(xTexelC${colIndex + 1}.xy, final.xy);\n                `;\n            }\n          } else {\n            mainLoop += `\n                if(xC >= 0 && xC < inDims[1] && xTexelC${colIndex}Ready == 0) {\n                  xTexelC${colIndex} = getX(batch, xR, xC, d1);\n                  if (xC + 1 >= inDims[1]) {\n                    xTexelC${colIndex}.zw = vec2(0.0);\n                  }\n                  xTexelC${colIndex}Ready = 1;\n                }\n\n                xCOffset = xC + strides[1];\n                if(xCOffset >= 0 && xCOffset < inDims[1] && xTexelC${\n                colIndex + 1}Ready == 0) {\n                  xTexelC${colIndex + 1} = getX(batch, xR, xCOffset, d1);\n                  if (xCOffset + 1 >= inDims[1]) {\n                    xTexelC${colIndex + 1}.zw = vec2(0.);\n                  }\n                  xTexelC${colIndex + 1}Ready = 1;\n                }\n\n                xC${colIndex} = vec4(\n                  xTexelC${colIndex}.xy, xTexelC${colIndex + 1}.xy);\n              `;\n\n            if (colIndex + 1 < filterWidth) {\n              mainLoop += `\n                  xC${colIndex + 1} = vec4(xTexelC${colIndex}.zw, xTexelC${\n                  colIndex + 1}.zw);\n                `;\n            }\n          }\n        }\n      }\n\n      // localize the dotProd accumulation within the loop, the theory is for\n      // GPU with limited cache, accumulate sum across large amount of\n      // veriables will cause lots of cache misses. (i.e. 5x5 filter will have\n      // 50 variables)\n      if (colIndex < filterWidth) {\n        mainLoop += `\n            wTexel = getW(r, ${colIndex}, d1, q);\n            dotProd += xC${colIndex} * vec4(wTexel.xz, wTexel.xz);\n          `;\n\n        if (colIndex + 1 < filterWidth) {\n          mainLoop += `\n              wTexel = getW(r, ${colIndex + 1}, d1, q);\n              dotProd += xC${colIndex + 1} * vec4(wTexel.xz, wTexel.xz);\n            `;\n        }\n      }\n    }\n    mainLoop += `\n    }\n  `;\n    mainLoop += `\n      }\n    `;\n\n    let activationSnippet = '', applyActivationSnippet = '';\n    if (activation) {\n      if (hasPreluActivation) {\n        activationSnippet = `vec4 activation(vec4 a) {\n          vec4 b = getPreluActivationWeightsAtOutCoords();\n          ${activation}\n        }`;\n      } else if (hasLeakyReluAlpha) {\n        activationSnippet = `vec4 activation(vec4 a) {\n          vec4 b = getLeakyreluAlphaAtOutCoords();\n          ${activation}\n        }`;\n      } else {\n        activationSnippet = `vec4 activation(vec4 x) {\n          ${activation}\n        }`;\n      }\n\n      applyActivationSnippet = `result = activation(result);`;\n    }\n\n    const addBiasSnippet = addBias ? 'result += getBiasAtOutCoords();' : '';\n    if (addBias) {\n      this.variableNames.push('bias');\n    }\n\n    if (hasPreluActivation) {\n      this.variableNames.push('preluActivationWeights');\n    }\n    if (hasLeakyReluAlpha) {\n      this.variableNames.push('leakyreluAlpha');\n    }\n\n    this.userCode = `\n      ${activationSnippet}\n\n      void main() {\n        ivec4 coords = getOutputCoords();\n        int batch = coords.x;\n        ivec2 xRCCorner = coords.yz * strides - pads;\n        int d2 = coords.w;\n        int d1 = d2 / ${channelMul};\n        int q = d2 - d1 * ${channelMul};\n        int xRCorner = xRCCorner.x;\n        int xCCorner = xRCCorner.y;\n\n        //intialize dotProd with a small epsilon seems to reduce GPU accuracy loss.\n        vec4 dotProd = vec4(0.000000000000001);\n\n        ${mainLoop}\n\n        vec4 result = dotProd - vec4(0.000000000000001);\n        ${addBiasSnippet}\n        ${applyActivationSnippet}\n        setOutput(result);\n      }\n    `;\n  }\n}\n"]}