dilate/erode 0 true #version 150 //OVE shader_name: dilate/erode //OVE shader_description: written by Thomas Wilshaw. //OVE main_input_name: Input uniform sampler2D tex_in; //OVE name: method //OVE type: SELECTION //OVE flag: NOT_KEYFRAMABLE, NOT_CONNECTABLE //OVE values: "BOX", "DISTANCE" //OVE values: "GAUSSIAN" //OVE default: 1 //OVE description: algorithm used for process uniform int method_in; //OVE name: size //OVE type: INTEGER //OVE flag: NOT_CONNECTABLE //OVE default: 5 //OVE description: dilate when >0, erode when <0 uniform int pixels_in; //OVE end uniform vec2 resolution_in; uniform int ove_iteration; // pixel coordinates in range [0..1]x[0..1] in vec2 ove_texcoord; // output color out vec4 frag_color; // Gaussian function uses PI #define M_PI 3.1415926535897932384626433832795 float gaussian2(float x, float y, float sigma) { return (1.0/((sigma*sigma)*2.0*M_PI))*exp(-0.5*(((x*x) + (y*y))/(sigma*sigma))); } void main(void) { vec2 pixel_coord; vec2 offset; vec4 sample; vec4 composite; int size = int(abs(float(pixels_in))); if (pixels_in == 0) { frag_color = texture(tex_in, ove_texcoord); return; } pixel_coord = ove_texcoord; // Constants for gaussian method float sigma = float(size) / 2.0; float max_weight = gaussian2(0.0, 0.0, sigma); size*=3; // GLSL has no FLOAT_MIN or FLOAT_MAX // Gaussian erode essentially inverts the image, does a gaussian dilate and then // reinverts the image hence there being a special case here for method_in == 2 composite = pixels_in > 0 || method_in == 2 ? vec4(-9999.0) : vec4(9999.0); for (int j = -size; j <= size; j++) { for(int i = -size; i <= size; i++) { offset.x = float(i) / resolution_in.x; offset.y = float(j) / resolution_in.y; if (method_in == 0) { // Box sample = texture(tex_in, pixel_coord+offset); if (pixels_in > 0) { composite = max(sample, composite); } else if (pixels_in < 0) { composite = min(sample, composite); } } else if (method_in == 1) { // Distance float len = length(offset); float scaled_size = float(size) / length(resolution_in); if (len <= scaled_size){ sample = texture(tex_in, pixel_coord+offset); if (pixels_in > 0) { composite = max(sample, composite); } else if (pixels_in < 0) { composite = min(sample, composite); } } } else if (method_in == 2) { // Gaussian float weight = gaussian2(float(i), float(j), sigma) / max_weight; sample = texture(tex_in, pixel_coord+offset); if (pixels_in > 0) { // weight^2 seems to give a better result composite = max(sample*weight*weight, composite); } else if (pixels_in < 0) { composite = max((1.0-sample)*weight*weight, composite); } } } } if (method_in == 2 && pixels_in < 0) { frag_color = vec4(1.0-composite); } else{ frag_color = vec4(composite); } } None 1 0 8

139955067874640

-1 -1 -1 -1 {df7415c1-39ac-4353-a00e-bc03a309c8da} {0509e6a5-5e1a-4cdc-bda1-958f81787433} 0 -1.90818 -0.106667