global_module_defs.hpp

// Common parameters. Ultimately, these need to be moved to a yaml file.
#pragma once
 
#include "relative_clock.hpp"
 
#include <algorithm>
#include <cmath>
#include <stdexcept>
#include <string>
 
namespace ILLIXR {
 
struct display_params {
    // Display width in pixels
    static constexpr unsigned width_pixels = 2560;
 
    // Display height in pixels
    static constexpr unsigned height_pixels = 1440;
 
    // Display width in meters
    static constexpr float width_meters = 0.11047f;
 
    // Display height in meters
    static constexpr float height_meters = 0.06214f;
 
    // Separation between lens centers in meters
    static constexpr float lens_separation = width_meters / 2.0f;
 
    // Vertical position of the lens in meters
    static constexpr float lens_vertical_position = height_meters / 2.0f;
 
    // Display horizontal field-of-view in degrees
    static constexpr float fov_x = 90.0f;
 
    // Display vertical field-of-view in degrees
    static constexpr float fov_y = 90.0f;
 
    // Meters per tangent angle at the center of the HMD (required by timewarp_gl's distortion correction)
    static constexpr float meters_per_tan_angle = width_meters / (2 * (fov_x * M_PI / 180.0f));
 
    // Inter-pupilary distance (ipd) in meters
    static constexpr float ipd = 0.064f;
 
    // Display refresh rate in Hz
    static constexpr float frequency = 120.0f;
 
    // Display period in nanoseconds
    static constexpr duration period = freq2period(frequency);
 
    // Chromatic aberration constants
    static constexpr float aberration[4] = {-0.016f, 0.0f, 0.024f, 0.0f};
};
 
struct rendering_params {
    // Near plane distance in meters
    static constexpr float near_z = 0.1f;
 
    // Far plane distance in meters
    static constexpr float far_z = 20.0f;
};
 
inline bool str_to_bool(const std::string& var) {
    std::string temp = var;
    std::transform(temp.begin(), temp.end(), temp.begin(), ::toupper);
    return (temp == "TRUE") ? true
        : (temp == "FALSE") ? false
                            : throw std::runtime_error("Invalid conversion from std::string to bool");
}
 
inline std::string getenv_or(const std::string& var, std::string default_) {
    if (std::getenv(var.c_str())) {
        return {std::getenv(var.c_str())};
    } else {
        return default_;
    }
}
 
} // namespace ILLIXR