I'm trying to get Twirl/Vortex Shader for some camera memes.
I'm not a programmer, could you somehow adapt this code for this plugin?
This code:
void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
float effectRadius = .5;
float effectAngle = 2. * PI;
vec2 center = iMouse.xy / iResolution.xy;
center = center == vec2(0., 0.) ? vec2(.5, .5) : center;
vec2 uv = fragCoord.xy / iResolution.xy - center;
float len = length(uv * vec2(iResolution.x / iResolution.y, 1.));
float angle = atan(uv.y, uv.x) + effectAngle * smoothstep(effectRadius, 0., len);
float radius = length(uv);
fragColor = texture(iChannel0, vec2(radius * cos(angle), radius * sin(angle)) + center);
}
or this code?
[Vertex_Shader]
void main()
{
gl_Position = ftransform();
gl_TexCoord[0] = gl_MultiTexCoord0;
}
[Pixel_Shader]
// Scene buffer
uniform sampler2D tex0;
// Currently not used in this demo!
uniform float time;
// GeeXLab built-in uniform, width of
// the current render target
uniform float rt_w;
// GeeXLab built-in uniform, height of
// the current render target
uniform float rt_h;
// Swirl effect parameters
uniform float radius = 200.0;
uniform float angle = 0.8;
uniform vec2 center = vec2(400.0, 300.0);
vec4 PostFX(sampler2D tex, vec2 uv, float time)
{
vec2 texSize = vec2(rt_w, rt_h);
vec2 tc = uv * texSize;
tc -= center;
float dist = length(tc);
if (dist < radius)
{
float percent = (radius - dist) / radius;
float theta = percent * percent * angle * 8.0;
float s = sin(theta);
float c = cos(theta);
tc = vec2(dot(tc, vec2(c, -s)), dot(tc, vec2(s, c)));
}
tc += center;
vec3 color = texture2D(tex0, tc / texSize).rgb;
return vec4(color, 1.0);
}
void main (void)
{
vec2 uv = gl_TexCoord[0].st;
gl_FragColor = PostFX(tex0, uv, time);
}
