@luma.gl/shadertools/dist/esm/modules/fp32/fp32.js

Shader module system for luma.gl

const fp32shader = "#ifdef LUMA_FP32_TAN_PRECISION_WORKAROUND\nconst float TWO_PI = 6.2831854820251465;\nconst float PI_2 = 1.5707963705062866;\nconst float PI_16 = 0.1963495463132858;\n\nconst float SIN_TABLE_0 = 0.19509032368659973;\nconst float SIN_TABLE_1 = 0.3826834261417389;\nconst float SIN_TABLE_2 = 0.5555702447891235;\nconst float SIN_TABLE_3 = 0.7071067690849304;\n\nconst float COS_TABLE_0 = 0.9807852506637573;\nconst float COS_TABLE_1 = 0.9238795042037964;\nconst float COS_TABLE_2 = 0.8314695954322815;\nconst float COS_TABLE_3 = 0.7071067690849304;\n\nconst float INVERSE_FACTORIAL_3 = 1.666666716337204e-01;\nconst float INVERSE_FACTORIAL_5 = 8.333333767950535e-03;\nconst float INVERSE_FACTORIAL_7 = 1.9841270113829523e-04;\nconst float INVERSE_FACTORIAL_9 = 2.75573188446287533e-06;\n\nfloat sin_taylor_fp32(float a) {\n  float r, s, t, x;\n\n  if (a == 0.0) {\n    return 0.0;\n  }\n\n  x = -a * a;\n  s = a;\n  r = a;\n\n  r = r * x;\n  t = r * INVERSE_FACTORIAL_3;\n  s = s + t;\n\n  r = r * x;\n  t = r * INVERSE_FACTORIAL_5;\n  s = s + t;\n\n  r = r * x;\n  t = r * INVERSE_FACTORIAL_7;\n  s = s + t;\n\n  r = r * x;\n  t = r * INVERSE_FACTORIAL_9;\n  s = s + t;\n\n  return s;\n}\n\nvoid sincos_taylor_fp32(float a, out float sin_t, out float cos_t) {\n  if (a == 0.0) {\n    sin_t = 0.0;\n    cos_t = 1.0;\n  }\n  sin_t = sin_taylor_fp32(a);\n  cos_t = sqrt(1.0 - sin_t * sin_t);\n}\n\nfloat tan_taylor_fp32(float a) {\n    float sin_a;\n    float cos_a;\n\n    if (a == 0.0) {\n        return 0.0;\n    }\n    float z = floor(a / TWO_PI);\n    float r = a - TWO_PI * z;\n\n    float t;\n    float q = floor(r / PI_2 + 0.5);\n    int j = int(q);\n\n    if (j < -2 || j > 2) {\n        return 1.0 / 0.0;\n    }\n\n    t = r - PI_2 * q;\n\n    q = floor(t / PI_16 + 0.5);\n    int k = int(q);\n    int abs_k = int(abs(float(k)));\n\n    if (abs_k > 4) {\n        return 1.0 / 0.0;\n    } else {\n        t = t - PI_16 * q;\n    }\n\n    float u = 0.0;\n    float v = 0.0;\n\n    float sin_t, cos_t;\n    float s, c;\n    sincos_taylor_fp32(t, sin_t, cos_t);\n\n    if (k == 0) {\n        s = sin_t;\n        c = cos_t;\n    } else {\n        if (abs(float(abs_k) - 1.0) < 0.5) {\n            u = COS_TABLE_0;\n            v = SIN_TABLE_0;\n        } else if (abs(float(abs_k) - 2.0) < 0.5) {\n            u = COS_TABLE_1;\n            v = SIN_TABLE_1;\n        } else if (abs(float(abs_k) - 3.0) < 0.5) {\n            u = COS_TABLE_2;\n            v = SIN_TABLE_2;\n        } else if (abs(float(abs_k) - 4.0) < 0.5) {\n            u = COS_TABLE_3;\n            v = SIN_TABLE_3;\n        }\n        if (k > 0) {\n            s = u * sin_t + v * cos_t;\n            c = u * cos_t - v * sin_t;\n        } else {\n            s = u * sin_t - v * cos_t;\n            c = u * cos_t + v * sin_t;\n        }\n    }\n\n    if (j == 0) {\n        sin_a = s;\n        cos_a = c;\n    } else if (j == 1) {\n        sin_a = c;\n        cos_a = -s;\n    } else if (j == -1) {\n        sin_a = -c;\n        cos_a = s;\n    } else {\n        sin_a = -s;\n        cos_a = -c;\n    }\n    return sin_a / cos_a;\n}\n#endif\n\nfloat tan_fp32(float a) {\n#ifdef LUMA_FP32_TAN_PRECISION_WORKAROUND\n  return tan_taylor_fp32(a);\n#else\n  return tan(a);\n#endif\n}\n";
export const fp32 = {
  name: 'fp32',
  vs: fp32shader,
  fs: null
};
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