isf.hpp

#pragma once
#include <ossia/detail/variant.hpp>
 
#include <array>
#include <optional>
#include <stdexcept>
#include <string>
#include <vector>
 
namespace isf
{
class invalid_file : public std::runtime_error
{
public:
  using std::runtime_error::runtime_error;
};
 
struct event_input
{
};
 
struct bool_input
{
  using value_type = bool;
  using has_default = std::true_type;
  bool def{};
};
 
struct long_input
{
  using value_type = int64_t;
  using has_minmax = std::true_type;
  std::vector<int64_t> values;
  std::vector<std::string> labels;
  std::size_t def{}; // index of default value
};
struct float_input
{
  using value_type = double;
  using has_minmax = std::true_type;
  double min{0.};
  double max{1.};
  double def{0.5};
};
 
struct point2d_input
{
  using value_type = std::array<double, 2>;
  using has_minmax = std::true_type;
  std::optional<value_type> def{};
  std::optional<value_type> min{};
  std::optional<value_type> max{};
};
 
struct point3d_input
{
  using value_type = std::array<double, 3>;
  using has_minmax = std::true_type;
  std::optional<value_type> def{};
  std::optional<value_type> min{};
  std::optional<value_type> max{};
};
 
struct color_input
{
  using value_type = std::array<double, 4>;
  using has_minmax = std::true_type;
  std::optional<value_type> def{};
  std::optional<value_type> min{};
  std::optional<value_type> max{};
};
 
struct image_input
{
};
 
struct audio_input
{
  int max{};
};
 
struct audioFFT_input
{
  int max{};
};
 
struct input
{
  using input_impl = ossia::variant<
      float_input, long_input, event_input, bool_input, color_input, point2d_input,
      point3d_input, image_input, audio_input, audioFFT_input>;
 
  std::string name;
  std::string label;
 
  input_impl data;
};
 
struct pass
{
  std::string target;
  bool persistent{};
  bool float_storage{};
  std::string width_expression{};
  std::string height_expression{};
};
 
struct descriptor
{
  std::string description;
  std::string credits;
  std::vector<std::string> categories;
  std::vector<input> inputs;
  std::vector<pass> passes;
  std::vector<std::string> pass_targets;
  bool default_vertex_shader{};
};
 
class parser
{
  std::string m_sourceVertex;
  std::string m_sourceFragment;
  std::string m_source_geometry_filter;
  int m_version{450};
 
  std::string m_vertex;
  std::string m_fragment;
  std::string m_geometry_filter;
 
  descriptor m_desc;
 
public:
  enum class ShaderType
  {
    Autodetect,
    ISF,
    ShaderToy,
    GLSLSandBox,
    GeometryFilter
  };
  parser(
      std::string vert, std::string frag, int glslVersion = 450,
      ShaderType = ShaderType::Autodetect);
  explicit parser(std::string isf_geom_filter);
 
  descriptor data() const;
  std::string vertex() const;
  std::string fragment() const;
  std::string geometry_filter() const;
 
private:
  void parse_isf();
  void parse_shadertoy();
  void parse_glsl_sandbox();
  void parse_geometry_filter();
 
  std::string parse_isf_header(std::string_view source);
};
}