Steps.h

Go to the documentation of this file.

/**
 * This file was automatically created with "create_c++_header.sh".
 * Do not edit manually.
 */
#pragma once
#include "../../colormap.h"
 
namespace colormap
{
    namespace IDL
    {
 
        class Steps : public Colormap
        {
        private:
            class Wrapper : public WrapperBase
            {
            public:
#ifdef float
#error "TODO"
#endif
#define float local_real_t
#include "../../../../shaders/glsl/IDL_Steps.frag"
#undef float
            };
 
        public:
            Color
            getColor(double x) const override
            {
                Wrapper w;
                vec4 c = w.colormap(x);
                Color result;
                result.r = std::max(0.0, std::min(1.0, c.r));
                result.g = std::max(0.0, std::min(1.0, c.g));
                result.b = std::max(0.0, std::min(1.0, c.b));
                result.a = std::max(0.0, std::min(1.0, c.a));
                return result;
            }
 
            std::string
            getTitle() const override
            {
                return std::string("Steps");
            }
 
            std::string
            getCategory() const override
            {
                return std::string("IDL");
            }
 
            std::string
            getSource() const override
            {
                return std::string(
                    "float colormap_erf(float x) {\n"
                    "    // erf approximation formula\n"
                    "    const float pi = 3.141592653589793238462643383279502884197169399;\n"
                    "    const float a = -8.0 * (pi - 3.0) / (3.0 * pi * (pi - 4.0));\n"
                    "    float v = 1.0 - exp(-x * x * (4.0 / pi + a * x * x) / (1.0 + a * x * "
                    "x));\n"
                    "    return sign(x) * sqrt(v);\n"
                    "}\n"
                    "\n"
                    "float colormap_red(float x) {\n"
                    "    if (x <= 95.5) {\n"
                    "        return 8.14475806451613E+00 * x - 5.23967741935484E+02;\n"
                    "    } else {\n"
                    "        return colormap_erf((x - 145.0) * 0.028) * 131.0 + 125.0;\n"
                    "    }\n"
                    "}\n"
                    "\n"
                    "float colormap_green(float x) {\n"
                    "    if (x < (3.14410256410256E+02 + 2.14285714285714E-01) / "
                    "(4.25000000000000E+01 + 9.81196581196581E+00)) {\n"
                    "        return 4.25000000000000E+01 * x - 2.14285714285714E-01;\n"
                    "    } else if (x < 192.0) { // actual root: 193.529143410603\n"
                    "        return -9.81196581196581E+00 * x + 3.14410256410256E+02;\n"
                    "    } else {\n"
                    "        return ((5.35129859215999E-04 * x - 2.98599683017528E-01) * x + "
                    "5.69466901216655E+01) * x - 3.71604038989543E+03;\n"
                    "    }\n"
                    "}\n"
                    "\n"
                    "float colormap_blue(float x) {\n"
                    "    if (x < 63.0) {\n"
                    "        return 8.22620967741936E+00 * x - 2.63729032258065E+02;\n"
                    "    } else if (x <= 95.5) {\n"
                    "        return 4.97690615835777E+00 * x - 3.16414039589443E+02;\n"
                    "    } else {\n"
                    "        return (((-7.88871743679920E-05 * x + 7.21525684930384E-02) * x - "
                    "2.45956037640571E+01) * x + 3.70824713134765E+03) * x - "
                    "2.08852518066406E+05;\n"
                    "    }\n"
                    "}\n"
                    "\n"
                    "vec4 colormap(float x) {\n"
                    "    float t = x * 255.0 - 0.5;\n"
                    "    float r = clamp(colormap_red(t) / 255.0, 0.0, 1.0);\n"
                    "    float g = clamp(colormap_green(t) / 255.0, 0.0, 1.0);\n"
                    "    float b = clamp(colormap_blue(t) / 255.0, 0.0, 1.0);\n"
                    "    return vec4(r, g, b, 1.0);\n"
                    "}\n");
            }
        };
 
    } // namespace IDL
} // namespace colormap