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/**
 * @license
 * Copyright 2017 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 { env } from '@tensorflow/tfjs-core';
import { getGlslDifferences } from './glsl_version';
import * as tex_util from './tex_util';
import * as webgl_util from './webgl_util';
export function createVertexShader(gl) {
    const glsl = getGlslDifferences();
    const vertexShaderSource = `${glsl.version}
    precision highp float;
    ${glsl.attribute} vec3 clipSpacePos;
    ${glsl.attribute} vec2 uv;
    ${glsl.varyingVs} vec2 resultUV;
 
    void main() {
      gl_Position = vec4(clipSpacePos, 1);
      resultUV = uv;
    }`;
    return webgl_util.createVertexShader(gl, vertexShaderSource);
}
export function createVertexBuffer(gl) {
    // [x y z u v] * [upper-left, lower-left, upper-right, lower-right]
    const vertexArray = new Float32Array([-1, 1, 0, 0, 1, -1, -1, 0, 0, 0, 1, 1, 0, 1, 1, 1, -1, 0, 1, 0]);
    return webgl_util.createStaticVertexBuffer(gl, vertexArray);
}
export function createIndexBuffer(gl) {
    // OpenGL (and WebGL) have "CCW == front" winding
    const triangleVertexIndices = new Uint16Array([0, 1, 2, 2, 1, 3]);
    return webgl_util.createStaticIndexBuffer(gl, triangleVertexIndices);
}
function createAndConfigureTexture(gl, width, height, internalFormat, textureFormat, textureType) {
    webgl_util.validateTextureSize(width, height);
    const texture = webgl_util.createTexture(gl);
    const tex2d = gl.TEXTURE_2D;
    webgl_util.callAndCheck(gl, () => gl.bindTexture(tex2d, texture));
    webgl_util.callAndCheck(gl, () => gl.texParameteri(tex2d, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE));
    webgl_util.callAndCheck(gl, () => gl.texParameteri(tex2d, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE));
    webgl_util.callAndCheck(gl, () => gl.texParameteri(tex2d, gl.TEXTURE_MIN_FILTER, gl.NEAREST));
    webgl_util.callAndCheck(gl, () => gl.texParameteri(tex2d, gl.TEXTURE_MAG_FILTER, gl.NEAREST));
    if (env().getNumber('WEBGL_VERSION') === 1) {
        webgl_util.callAndCheck(gl, () => gl.texImage2D(tex2d, 0, internalFormat, width, height, 0, textureFormat, textureType, null));
    }
    else {
        webgl_util.callAndCheck(gl, () => gl
            .texStorage2D(tex2d, 1, internalFormat, width, height));
    }
    webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));
    return { texture, texShape: [height, width] };
}
export function getInternalFormatForFloat32MatrixTexture(textureConfig) {
    return textureConfig.internalFormatFloat;
}
export function createFloat32MatrixTexture(gl, rows, columns, textureConfig) {
    const [width, height] = tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);
    return createAndConfigureTexture(gl, width, height, getInternalFormatForFloat32MatrixTexture(textureConfig), textureConfig.textureFormatFloat, gl.FLOAT);
}
export function getInternalFormatForFloat16MatrixTexture(textureConfig) {
    return textureConfig.internalFormatHalfFloat;
}
export function createFloat16MatrixTexture(gl, rows, columns, textureConfig) {
    const [width, height] = tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);
    return createAndConfigureTexture(gl, width, height, getInternalFormatForFloat16MatrixTexture(textureConfig), textureConfig.textureFormatFloat, textureConfig.textureTypeHalfFloat);
}
export function getInternalFormatForUnsignedBytesMatrixTexture(textureConfig) {
    return textureConfig.downloadTextureFormat;
}
export function createUnsignedBytesMatrixTexture(gl, rows, columns, textureConfig) {
    const [width, height] = tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);
    return createAndConfigureTexture(gl, width, height, getInternalFormatForUnsignedBytesMatrixTexture(textureConfig), gl.RGBA, gl.UNSIGNED_BYTE);
}
export function getInternalFormatForPackedMatrixTexture(textureConfig) {
    return textureConfig.internalFormatPackedFloat;
}
export function createPackedMatrixTexture(gl, rows, columns, textureConfig) {
    const [width, height] = tex_util.getPackedMatrixTextureShapeWidthHeight(rows, columns);
    return createAndConfigureTexture(gl, width, height, getInternalFormatForPackedMatrixTexture(textureConfig), gl.RGBA, gl.FLOAT);
}
export function getInternalFormatForFloat16PackedMatrixTexture(textureConfig) {
    return textureConfig.internalFormatPackedHalfFloat;
}
export function createFloat16PackedMatrixTexture(gl, rows, columns, textureConfig) {
    const [width, height] = tex_util.getPackedMatrixTextureShapeWidthHeight(rows, columns);
    return createAndConfigureTexture(gl, width, height, getInternalFormatForFloat16PackedMatrixTexture(textureConfig), gl.RGBA, textureConfig.textureTypeHalfFloat);
}
export function bindVertexProgramAttributeStreams(gl, program, vertexBuffer) {
    const posOffset = 0; // x is the first buffer element
    const uvOffset = 3 * 4; // uv comes after [x y z]
    const stride = (3 * 4) + (2 * 4); // xyz + uv, each entry is 4-byte float.
    webgl_util.callAndCheck(gl, () => gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer));
    const success = webgl_util.bindVertexBufferToProgramAttribute(gl, program, 'clipSpacePos', vertexBuffer, 3, stride, posOffset);
    return success &&
        webgl_util.bindVertexBufferToProgramAttribute(gl, program, 'uv', vertexBuffer, 2, stride, uvOffset);
}
export function uploadDenseMatrixToTexture(gl, texture, width, height, data, textureConfig) {
    webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, texture));
    let dataForUpload, texelDataType, internalFormat;
    if (data instanceof Uint8Array) {
        dataForUpload = new Uint8Array(width * height * 4);
        texelDataType = gl.UNSIGNED_BYTE;
        internalFormat = gl.RGBA;
    }
    else {
        dataForUpload = new Float32Array(width * height * 4);
        texelDataType = gl.FLOAT;
        internalFormat = textureConfig.internalFormatPackedFloat;
    }
    dataForUpload.set(data);
    if (env().getNumber('WEBGL_VERSION') === 2) {
        webgl_util.callAndCheck(gl, () => gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, width, height, gl.RGBA, texelDataType, dataForUpload));
    }
    else {
        webgl_util.callAndCheck(gl, () => gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, width, height, 0, gl.RGBA, texelDataType, dataForUpload));
    }
    webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));
}
export function uploadPixelDataToTexture(gl, texture, pixels) {
    webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, texture));
    if (pixels.data instanceof Uint8Array) {
        if (env().getNumber('WEBGL_VERSION') === 2) {
            webgl_util.callAndCheck(gl, () => gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, pixels.width, pixels.height, gl.RGBA, gl.UNSIGNED_BYTE, pixels.data));
        }
        else {
            webgl_util.callAndCheck(gl, () => gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, pixels.width, pixels.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, pixels.data));
        }
    }
    else {
        if (env().getNumber('WEBGL_VERSION') === 2) {
            webgl_util.callAndCheck(gl, () => gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, pixels));
        }
        else {
            webgl_util.callAndCheck(gl, () => gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, pixels));
        }
    }
    webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));
}
export function createBufferFromOutputTexture(gl2, rows, columns, textureConfig) {
    // Create and bind the buffer.
    const buffer = gl2.createBuffer();
    webgl_util.callAndCheck(gl2, () => gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer));
    // Initialize the buffer to the size of the texture in bytes.
    const bytesPerFloat = 4;
    const valuesPerTexel = 4;
    const bufferSizeBytes = bytesPerFloat * valuesPerTexel * rows * columns;
    webgl_util.callAndCheck(gl2, () => gl2.bufferData(gl2.PIXEL_PACK_BUFFER, bufferSizeBytes, gl2.STREAM_READ));
    // Enqueue a command on the GPU command queue to copy of texture into the
    // buffer.
    webgl_util.callAndCheck(gl2, () => gl2.readPixels(0, 0, columns, rows, gl2.RGBA, gl2.FLOAT, 0));
    webgl_util.callAndCheck(gl2, () => gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null));
    return buffer;
}
export function downloadFloat32MatrixFromBuffer(gl, buffer, size) {
    const gl2 = gl;
    const downloadTarget = new Float32Array(size);
    gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer);
    gl2.getBufferSubData(gl2.PIXEL_PACK_BUFFER, 0, downloadTarget);
    gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null);
    return downloadTarget;
}
export function downloadByteEncodedFloatMatrixFromOutputTexture(gl, rows, columns, textureConfig) {
    const [w, h] = tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);
    const numChannels = 4;
    const downloadTarget = new Uint8Array(tex_util.getUnpackedArraySizeFromMatrixSize(rows * columns, numChannels));
    webgl_util.callAndCheck(gl, () => gl.readPixels(0, 0, w, h, textureConfig.downloadTextureFormat, gl.UNSIGNED_BYTE, downloadTarget));
    // By wrapping the buffer in a Float32Array, we use native browser IEEE 754
    // decoding of the 4 bytes that back each 32 bit float.
    return new Float32Array(downloadTarget.buffer);
}
export function downloadPackedMatrixFromBuffer(gl, buffer, batch, rows, cols, physicalRows, physicalCols, textureConfig) {
    const gl2 = gl;
    const downloadTarget = new Float32Array(tex_util.getPackedRGBAArraySizeFromMatrixShape(physicalRows, physicalCols));
    gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer);
    gl2.getBufferSubData(gl2.PIXEL_PACK_BUFFER, 0, downloadTarget);
    gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null);
    return downloadTarget;
}
export function downloadMatrixFromPackedOutputTexture(gl, physicalRows, physicalCols) {
    const packedRGBA = new Float32Array(physicalRows * physicalCols * 4);
    webgl_util.callAndCheck(gl, () => gl.readPixels(0, 0, physicalCols, physicalRows, gl.RGBA, gl.FLOAT, packedRGBA));
    return packedRGBA;
}
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* @license\n * Copyright 2017 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 {env, PixelData, TypedArray} from '@tensorflow/tfjs-core';\n\nimport {getGlslDifferences} from './glsl_version';\nimport * as tex_util from './tex_util';\nimport {Texture, TextureConfig} from './tex_util';\nimport * as webgl_util from './webgl_util';\n\nexport function createVertexShader(gl: WebGLRenderingContext): WebGLShader {\n  const glsl = getGlslDifferences();\n  const vertexShaderSource = `${glsl.version}\n    precision highp float;\n    ${glsl.attribute} vec3 clipSpacePos;\n    ${glsl.attribute} vec2 uv;\n    ${glsl.varyingVs} vec2 resultUV;\n\n    void main() {\n      gl_Position = vec4(clipSpacePos, 1);\n      resultUV = uv;\n    }`;\n  return webgl_util.createVertexShader(gl, vertexShaderSource);\n}\n\nexport function createVertexBuffer(gl: WebGLRenderingContext): WebGLBuffer {\n  // [x y z u v] * [upper-left, lower-left, upper-right, lower-right]\n  const vertexArray = new Float32Array(\n      [-1, 1, 0, 0, 1, -1, -1, 0, 0, 0, 1, 1, 0, 1, 1, 1, -1, 0, 1, 0]);\n  return webgl_util.createStaticVertexBuffer(gl, vertexArray);\n}\n\nexport function createIndexBuffer(gl: WebGLRenderingContext): WebGLBuffer {\n  // OpenGL (and WebGL) have \"CCW == front\" winding\n  const triangleVertexIndices = new Uint16Array([0, 1, 2, 2, 1, 3]);\n  return webgl_util.createStaticIndexBuffer(gl, triangleVertexIndices);\n}\n\nfunction createAndConfigureTexture(\n    gl: WebGLRenderingContext, width: number, height: number,\n    internalFormat: number, textureFormat: number,\n    textureType: number): Texture {\n  webgl_util.validateTextureSize(width, height);\n  const texture = webgl_util.createTexture(gl);\n\n  const tex2d = gl.TEXTURE_2D;\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(tex2d, texture));\n  webgl_util.callAndCheck(\n      gl, () => gl.texParameteri(tex2d, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE));\n  webgl_util.callAndCheck(\n      gl, () => gl.texParameteri(tex2d, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE));\n  webgl_util.callAndCheck(\n      gl, () => gl.texParameteri(tex2d, gl.TEXTURE_MIN_FILTER, gl.NEAREST));\n  webgl_util.callAndCheck(\n      gl, () => gl.texParameteri(tex2d, gl.TEXTURE_MAG_FILTER, gl.NEAREST));\n  if (env().getNumber('WEBGL_VERSION') === 1) {\n    webgl_util.callAndCheck(\n        gl,\n        () => gl.texImage2D(\n            tex2d, 0, internalFormat, width, height, 0, textureFormat,\n            textureType, null));\n  } else {\n    webgl_util.callAndCheck(\n        gl,\n        () => (gl as WebGL2RenderingContext)\n                  .texStorage2D(tex2d, 1, internalFormat, width, height));\n  }\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));\n\n  return {texture, texShape: [height, width]};\n}\n\nexport function getInternalFormatForFloat32MatrixTexture(\n    textureConfig: TextureConfig) {\n  return textureConfig.internalFormatFloat;\n}\n\nexport function createFloat32MatrixTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): Texture {\n  const [width, height] =\n      tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);\n  return createAndConfigureTexture(\n      gl, width, height,\n      getInternalFormatForFloat32MatrixTexture(textureConfig),\n      textureConfig.textureFormatFloat, gl.FLOAT);\n}\n\nexport function getInternalFormatForFloat16MatrixTexture(\n    textureConfig: TextureConfig) {\n  return textureConfig.internalFormatHalfFloat;\n}\n\nexport function createFloat16MatrixTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): Texture {\n  const [width, height] =\n      tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);\n  return createAndConfigureTexture(\n      gl, width, height,\n      getInternalFormatForFloat16MatrixTexture(textureConfig),\n      textureConfig.textureFormatFloat, textureConfig.textureTypeHalfFloat);\n}\n\nexport function getInternalFormatForUnsignedBytesMatrixTexture(\n    textureConfig: TextureConfig) {\n  return textureConfig.downloadTextureFormat;\n}\n\nexport function createUnsignedBytesMatrixTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): Texture {\n  const [width, height] =\n      tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);\n  return createAndConfigureTexture(\n      gl, width, height,\n      getInternalFormatForUnsignedBytesMatrixTexture(textureConfig), gl.RGBA,\n      gl.UNSIGNED_BYTE);\n}\n\nexport function getInternalFormatForPackedMatrixTexture(\n    textureConfig: TextureConfig) {\n  return textureConfig.internalFormatPackedFloat;\n}\n\nexport function createPackedMatrixTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): Texture {\n  const [width, height] =\n      tex_util.getPackedMatrixTextureShapeWidthHeight(rows, columns);\n  return createAndConfigureTexture(\n      gl, width, height, getInternalFormatForPackedMatrixTexture(textureConfig),\n      gl.RGBA, gl.FLOAT);\n}\n\nexport function getInternalFormatForFloat16PackedMatrixTexture(\n    textureConfig: TextureConfig) {\n  return textureConfig.internalFormatPackedHalfFloat;\n}\n\nexport function createFloat16PackedMatrixTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): Texture {\n  const [width, height] =\n      tex_util.getPackedMatrixTextureShapeWidthHeight(rows, columns);\n  return createAndConfigureTexture(\n      gl, width, height,\n      getInternalFormatForFloat16PackedMatrixTexture(textureConfig), gl.RGBA,\n      textureConfig.textureTypeHalfFloat);\n}\n\nexport function bindVertexProgramAttributeStreams(\n    gl: WebGLRenderingContext, program: WebGLProgram,\n    vertexBuffer: WebGLBuffer): boolean {\n  const posOffset = 0;               // x is the first buffer element\n  const uvOffset = 3 * 4;            // uv comes after [x y z]\n  const stride = (3 * 4) + (2 * 4);  // xyz + uv, each entry is 4-byte float.\n  webgl_util.callAndCheck(\n      gl, () => gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer));\n  const success = webgl_util.bindVertexBufferToProgramAttribute(\n      gl, program, 'clipSpacePos', vertexBuffer, 3, stride, posOffset);\n  return success &&\n      webgl_util.bindVertexBufferToProgramAttribute(\n          gl, program, 'uv', vertexBuffer, 2, stride, uvOffset);\n}\n\nexport function uploadDenseMatrixToTexture(\n    gl: WebGLRenderingContext, texture: WebGLTexture, width: number,\n    height: number, data: TypedArray, textureConfig: TextureConfig) {\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, texture));\n\n  let dataForUpload: TypedArray, texelDataType: number, internalFormat: number;\n  if (data instanceof Uint8Array) {\n    dataForUpload = new Uint8Array(width * height * 4);\n    texelDataType = gl.UNSIGNED_BYTE;\n    internalFormat = gl.RGBA;\n  } else {\n    dataForUpload = new Float32Array(width * height * 4);\n    texelDataType = gl.FLOAT;\n    internalFormat = textureConfig.internalFormatPackedFloat;\n  }\n\n  dataForUpload.set(data);\n  if (env().getNumber('WEBGL_VERSION') === 2) {\n    webgl_util.callAndCheck(\n        gl,\n        () => gl.texSubImage2D(\n            gl.TEXTURE_2D, 0, 0, 0, width, height, gl.RGBA, texelDataType,\n            dataForUpload));\n  } else {\n    webgl_util.callAndCheck(\n        gl,\n        () => gl.texImage2D(\n            gl.TEXTURE_2D, 0, internalFormat, width, height, 0, gl.RGBA,\n            texelDataType, dataForUpload));\n  }\n\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));\n}\n\nexport function uploadPixelDataToTexture(\n    gl: WebGLRenderingContext, texture: WebGLTexture,\n    pixels: PixelData|ImageData|HTMLImageElement|HTMLCanvasElement|\n    HTMLVideoElement|ImageBitmap) {\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, texture));\n  if ((pixels as PixelData).data instanceof Uint8Array) {\n    if (env().getNumber('WEBGL_VERSION') === 2) {\n      webgl_util.callAndCheck(\n          gl,\n          () => gl.texSubImage2D(\n              gl.TEXTURE_2D, 0, 0, 0, pixels.width, pixels.height, gl.RGBA,\n              gl.UNSIGNED_BYTE, (pixels as PixelData).data));\n    } else {\n      webgl_util.callAndCheck(\n          gl,\n          () => gl.texImage2D(\n              gl.TEXTURE_2D, 0, gl.RGBA, pixels.width, pixels.height, 0,\n              gl.RGBA, gl.UNSIGNED_BYTE, (pixels as PixelData).data));\n    }\n  } else {\n    if (env().getNumber('WEBGL_VERSION') === 2) {\n      webgl_util.callAndCheck(\n          gl,\n          () => gl.texSubImage2D(\n              gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE,\n              (pixels as ImageData | HTMLImageElement | HTMLCanvasElement |\n               HTMLVideoElement | ImageBitmap)));\n    } else {\n      webgl_util.callAndCheck(\n          gl,\n          () => gl.texImage2D(\n              gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE,\n              pixels as ImageData | HTMLImageElement | HTMLCanvasElement |\n                  HTMLVideoElement | ImageBitmap));\n    }\n  }\n\n  webgl_util.callAndCheck(gl, () => gl.bindTexture(gl.TEXTURE_2D, null));\n}\n\nexport function createBufferFromOutputTexture(\n    gl2: WebGL2RenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig): WebGLBuffer {\n  // Create and bind the buffer.\n  const buffer = gl2.createBuffer();\n  webgl_util.callAndCheck(\n      gl2, () => gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer));\n\n  // Initialize the buffer to the size of the texture in bytes.\n  const bytesPerFloat = 4;\n  const valuesPerTexel = 4;\n  const bufferSizeBytes = bytesPerFloat * valuesPerTexel * rows * columns;\n\n  webgl_util.callAndCheck(\n      gl2,\n      () => gl2.bufferData(\n          gl2.PIXEL_PACK_BUFFER, bufferSizeBytes, gl2.STREAM_READ));\n\n  // Enqueue a command on the GPU command queue to copy of texture into the\n  // buffer.\n  webgl_util.callAndCheck(\n      gl2, () => gl2.readPixels(0, 0, columns, rows, gl2.RGBA, gl2.FLOAT, 0));\n\n  webgl_util.callAndCheck(\n      gl2, () => gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null));\n\n  return buffer;\n}\n\nexport function downloadFloat32MatrixFromBuffer(\n    gl: WebGLRenderingContext, buffer: WebGLBuffer,\n    size: number): Float32Array {\n  const gl2 = gl as WebGL2RenderingContext;\n\n  const downloadTarget = new Float32Array(size);\n\n  gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer);\n  gl2.getBufferSubData(gl2.PIXEL_PACK_BUFFER, 0, downloadTarget);\n  gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null);\n\n  return downloadTarget;\n}\n\nexport function downloadByteEncodedFloatMatrixFromOutputTexture(\n    gl: WebGLRenderingContext, rows: number, columns: number,\n    textureConfig: TextureConfig) {\n  const [w, h] =\n      tex_util.getUnpackedMatrixTextureShapeWidthHeight(rows, columns);\n\n  const numChannels = 4;\n  const downloadTarget = new Uint8Array(\n      tex_util.getUnpackedArraySizeFromMatrixSize(rows * columns, numChannels));\n\n  webgl_util.callAndCheck(\n      gl,\n      () => gl.readPixels(\n          0, 0, w, h, textureConfig.downloadTextureFormat, gl.UNSIGNED_BYTE,\n          downloadTarget));\n\n  // By wrapping the buffer in a Float32Array, we use native browser IEEE 754\n  // decoding of the 4 bytes that back each 32 bit float.\n  return new Float32Array(downloadTarget.buffer);\n}\n\nexport function downloadPackedMatrixFromBuffer(\n    gl: WebGLRenderingContext, buffer: WebGLBuffer, batch: number, rows: number,\n    cols: number, physicalRows: number, physicalCols: number,\n    textureConfig: TextureConfig): Float32Array {\n  const gl2 = gl as WebGL2RenderingContext;\n\n  const downloadTarget =\n      new Float32Array(tex_util.getPackedRGBAArraySizeFromMatrixShape(\n          physicalRows, physicalCols));\n\n  gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, buffer);\n  gl2.getBufferSubData(gl2.PIXEL_PACK_BUFFER, 0, downloadTarget);\n  gl2.bindBuffer(gl2.PIXEL_PACK_BUFFER, null);\n\n  return downloadTarget;\n}\n\nexport function downloadMatrixFromPackedOutputTexture(\n    gl: WebGLRenderingContext, physicalRows: number,\n    physicalCols: number): Float32Array {\n  const packedRGBA = new Float32Array(physicalRows * physicalCols * 4);\n  webgl_util.callAndCheck(\n      gl,\n      () => gl.readPixels(\n          0, 0, physicalCols, physicalRows, gl.RGBA, gl.FLOAT, packedRGBA));\n\n  return packedRGBA;\n}\n"]}