Function createProgramObjects

tfjs-react-native/src/camera/camera_webgl_util.ts:367–424

(
    gl: WebGL2RenderingContext, vertexShaderSource: string,
    fragmentShaderSource: string, vertices: Float32Array,
    texCoords: Float32Array)

}

function createProgramObjects(
    gl: WebGL2RenderingContext, vertexShaderSource: string,
    fragmentShaderSource: string, vertices: Float32Array,
    texCoords: Float32Array): ProgramObjects {
  const vertShader = gl.createShader(gl.VERTEX_SHADER);
  gl.shaderSource(vertShader, vertexShaderSource);
  gl.compileShader(vertShader);

  const fragShader = gl.createShader(gl.FRAGMENT_SHADER);
  gl.shaderSource(fragShader, fragmentShaderSource);
  gl.compileShader(fragShader);

  const program = gl.createProgram();
  gl.attachShader(program, vertShader);
  gl.attachShader(program, fragShader);
  gl.linkProgram(program);
  gl.validateProgram(program);

  // Use a vertex array objects to record geometry info
  const vao = gl.createVertexArray();
  gl.bindVertexArray(vao);

  // Set up geometry
  webgl_util.callAndCheck(gl, () => {
    const positionAttrib = gl.getAttribLocation(program, 'position');
    const vertsCoordsBuffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, vertsCoordsBuffer);
    gl.enableVertexAttribArray(positionAttrib);
    gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
    gl.vertexAttribPointer(positionAttrib, 2, gl.FLOAT, false, 0, 0);
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
  });

  webgl_util.callAndCheck(gl, () => {
    const texCoordsAttrib = gl.getAttribLocation(program, 'texCoords');
    const texCoordsBuffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, texCoordsBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, texCoords, gl.STATIC_DRAW);
    gl.enableVertexAttribArray(texCoordsAttrib);
    gl.vertexAttribPointer(texCoordsAttrib, 2, gl.FLOAT, false, 0, 0);
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
  });

  const uniformLocations = new Map<string, WebGLUniformLocation>();
  webgl_util.callAndCheck(gl, () => {
    const inputTextureLoc = gl.getUniformLocation(program, 'inputTexture');
    uniformLocations.set('inputTexture', inputTextureLoc);
  });

  // Unbind
  gl.bindVertexArray(null);
  return {
    program,
    vao,
    vertices,
    uniformLocations,
  };
}