Equirectangular.cpp (FFGL 2.1)

Equirectangular.cpp

#include "Equirectangular.h"
using namespace ffglex;
using namespace ffglqs;

static CFFGLPluginInfo PluginInfo(
	PluginFactory< Equirectangular >,// Create method
	"SH06",                  // Plugin unique ID of maximum length 4.
	"Equirectangular",               // Plugin name
	2,                       // API major version number
	1,                       // API minor version number
	1,                       // Plugin major version number
	0,                       // Plugin minor version number
	FF_EFFECT,               // Plugin type
	"",                      // Plugin description
	""                       // About
);

static const std::string fragmentShaderCode = R"(
#define PI 3.141592653589793
#define TWPI 6.283185307179586

vec2 lookXY = vec2(look_X, look_Y);
vec2 positionXY = vec2(position_X, position_Y);

vec2 _rotate(vec2 v, float angle) {return cos(angle)*v+sin(angle)*vec2(v.y,-v.x);}

void main()
{
    vec2 _uv = (gl_FragCoord.xy / resolution.xy);
	vec2 _uvc = (_uv.xy / resolution.y - vec2(resolution.x / resolution.y / 2.0, 0.5) * 4.0);
    vec2 v = _uv + resolution.y;
    v.y -= 0.5;
	v.x -= 0.5;
	

    float th = v.y * PI,
        ph = v.x * TWPI;
    vec3 sp = vec3( sin(ph) * cos(th), sin(th), cos(ph) * cos(th) );
    vec3 pos = vec3( PI, perspective * PI, 0);
	pos *= scale;
    sp = mix(sp, normalize(vec3(_uvc, 1.0)), perspective);

    sp.yz = _rotate(sp.yz, lookXY.y*PI);
    sp.xy = _rotate(sp.xy, lookXY.x*PI);

    fragColor = texture(inputTexture, vec2(dot(pos, sp.zxy), dot(pos.yzx, sp.zxy))+positionXY.xy);
}
)";

Equirectangular::Equirectangular()
{
	// Input properties
	SetMinInputs( 1 );
	SetMaxInputs( 1 );

	SetFragmentShader( fragmentShaderCode );
	AddParam( ParamRange::Create( "scale", 0.15, { 0.01, 0.5 } ) );
	AddParam( ParamRange::Create( "zoom", 1.0, { 0.01, 1.0 } ) );
	AddParam( Param::Create( "perspective" ) );
	AddParam( Param::Create( "rotate" ) );
	AddParam( Param::Create( "look_X" ) );
	AddParam( Param::Create( "look_Y" ) );
	AddParam( Param::Create( "position_X", 0.5 ) );
	AddParam( Param::Create( "position_Y", 0.5 ) );
}
Equirectangular::~Equirectangular()
{
}