Erase overlapping. Draw by openFrameworks – プログラミング de 落描き

[ Video ]

[ About ]
ofFboに3枚の画像を描いて、shaderで重なった部分を消す。

Draw three images on the ofFbo and use the shader to remove the overlapping parts.

[ Source ]

#pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	void draw_arrow(glm::vec2 location, glm::vec2 next_location, float size);

	ofShader shader;
	ofFbo fbo1;
	ofFbo fbo2;
	ofFbo fbo3;
};

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:

void setup();

void update();

void draw();

void keyPressed(int key) {};

void keyReleased(int key) {};

void mouseMoved(int x, int y) {};

void mouseDragged(int x, int y, int button) {};

void mousePressed(int x, int y, int button) {};

void mouseReleased(int x, int y, int button) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

void draw_arrow(glm::vec2 location, glm::vec2 next_location, float size);

ofShader shader;

ofFbo fbo1;

ofFbo fbo2;

ofFbo fbo3;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	ofBackground(239);
	ofSetColor(0);

	this->shader.load("shader/shader.vert", "shader/shader.frag");
	this->fbo1.allocate(ofGetWidth(), ofGetHeight());
	this->fbo2.allocate(ofGetWidth(), ofGetHeight());
	this->fbo3.allocate(ofGetWidth(), ofGetHeight());
}

//--------------------------------------------------------------
void ofApp::update() {

	ofSeedRandom(39);

	vector<glm::vec2> location_list;
	vector<glm::vec2> next_list;

	this->fbo1.begin();
	ofClear(0);
	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);
	
	for (int i = 0; i < 3; i++) {

		auto deg = ofGetFrameNum() + i * 120;
		auto location = glm::vec2(230 * cos(deg * DEG_TO_RAD), 230 * sin(deg * DEG_TO_RAD));
		auto next = glm::vec2(230 * cos((deg + 1) * DEG_TO_RAD), 230 * sin((deg + 1) *DEG_TO_RAD));

		location_list.push_back(location);
		next_list.push_back(next);
	}

	for (int i = 0; i < location_list.size(); i++) {

		this->draw_arrow(location_list[i], next_list[i], 120);
	}

	this->fbo1.end();

	this->fbo2.begin();
	ofClear(0);
	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

	for (int i = 0; i < location_list.size(); i++) {

		auto location = location_list[i];
		auto next = next_list[i];

		int range = 120;
		for (int k = 0; k < 10; k++) {

			auto child_noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));
			auto child_location = location + glm::vec2(ofMap(ofNoise(child_noise_seed.x, ofGetFrameNum() * 0.01), 0, 1, -range, range), ofMap(ofNoise(child_noise_seed.y, ofGetFrameNum() * 0.01), 0, 1, -range, range));
			auto child_next = next + glm::vec2(ofMap(ofNoise(child_noise_seed.x, (ofGetFrameNum() + 1) * 0.01), 0, 1, -range, range), ofMap(ofNoise(child_noise_seed.y, (ofGetFrameNum() + 1) * 0.01), 0, 1, -range, range));

			this->draw_arrow(child_location, child_next, 30);

		}
	}

	this->fbo2.end();

	this->fbo3.begin();
	ofClear(0);
	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

	int out = 600;
	int in = 500;

	ofBeginShape();
	ofVertex(out * -0.5, out * -0.5);
	ofVertex(out *  0.5, out * -0.5);
	ofVertex(out *  0.5, out *  0.5);
	ofVertex(out * -0.5, out *  0.5);
	ofNextContour(true);
	ofVertex(in * -0.5, in * -0.5);
	ofVertex(in *  0.5, in * -0.5);
	ofVertex(in *  0.5, in *  0.5);
	ofVertex(in * -0.5, in *  0.5);

	ofEndShape();

	this->fbo3.end();
}

//--------------------------------------------------------------
void ofApp::draw() {

	ofFill();
	this->shader.begin();
	this->shader.setUniform1f("time", ofGetElapsedTimef());
	this->shader.setUniform2f("resolution", ofGetWidth(), ofGetHeight());
	this->shader.setUniformTexture("tex1", this->fbo1.getTexture(), 1);
	this->shader.setUniformTexture("tex2", this->fbo2.getTexture(), 2);
	this->shader.setUniformTexture("tex3", this->fbo3.getTexture(), 3);

	ofDrawRectangle(glm::vec2(0, 0), ofGetWidth(), ofGetHeight());

	this->shader.end();
}

//--------------------------------------------------------------
void ofApp::draw_arrow(glm::vec2 location, glm::vec2 next_location, float size) {

	auto angle = std::atan2(next_location.y - location.y, next_location.x - location.x);

	ofFill();
	ofBeginShape();
	ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));
	ofEndShape();

	ofBeginShape();
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);
	ofEndShape();
}

//--------------------------------------------------------------
int main() {

	ofGLWindowSettings settings;
	settings.setGLVersion(3, 2);
	settings.setSize(720, 720);
	ofCreateWindow(settings);
	ofRunApp(new ofApp());
}

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#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetColor(0);

this->shader.load("shader/shader.vert", "shader/shader.frag");

this->fbo1.allocate(ofGetWidth(), ofGetHeight());

this->fbo2.allocate(ofGetWidth(), ofGetHeight());

this->fbo3.allocate(ofGetWidth(), ofGetHeight());

}

//--------------------------------------------------------------

void ofApp::update() {

ofSeedRandom(39);

vector<glm::vec2> location_list;

vector<glm::vec2> next_list;

this->fbo1.begin();

ofClear(0);

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

for (int i = 0; i < 3; i++) {

auto deg = ofGetFrameNum() + i * 120;

auto location = glm::vec2(230 * cos(deg * DEG_TO_RAD), 230 * sin(deg * DEG_TO_RAD));

auto next = glm::vec2(230 * cos((deg + 1) * DEG_TO_RAD), 230 * sin((deg + 1) *DEG_TO_RAD));

location_list.push_back(location);

next_list.push_back(next);

}

for (int i = 0; i < location_list.size(); i++) {

this->draw_arrow(location_list[i], next_list[i], 120);

}

this->fbo1.end();

this->fbo2.begin();

ofClear(0);

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

for (int i = 0; i < location_list.size(); i++) {

auto location = location_list[i];

auto next = next_list[i];

int range = 120;

for (int k = 0; k < 10; k++) {

auto child_noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));

auto child_location = location + glm::vec2(ofMap(ofNoise(child_noise_seed.x, ofGetFrameNum() * 0.01), 0, 1, -range, range), ofMap(ofNoise(child_noise_seed.y, ofGetFrameNum() * 0.01), 0, 1, -range, range));

auto child_next = next + glm::vec2(ofMap(ofNoise(child_noise_seed.x, (ofGetFrameNum() + 1) * 0.01), 0, 1, -range, range), ofMap(ofNoise(child_noise_seed.y, (ofGetFrameNum() + 1) * 0.01), 0, 1, -range, range));

this->draw_arrow(child_location, child_next, 30);

}

this->fbo2.end();

this->fbo3.begin();

ofClear(0);

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

int out = 600;

int in = 500;

ofBeginShape();

ofVertex(out * -0.5, out * -0.5);

ofVertex(out * 0.5, out * -0.5);

ofVertex(out * 0.5, out * 0.5);

ofVertex(out * -0.5, out * 0.5);

ofNextContour(true);

ofVertex(in * -0.5, in * -0.5);

ofVertex(in * 0.5, in * -0.5);

ofVertex(in * 0.5, in * 0.5);

ofVertex(in * -0.5, in * 0.5);

ofEndShape();

this->fbo3.end();

}

//--------------------------------------------------------------

void ofApp::draw() {

ofFill();

this->shader.begin();

this->shader.setUniform1f("time", ofGetElapsedTimef());

this->shader.setUniform2f("resolution", ofGetWidth(), ofGetHeight());

this->shader.setUniformTexture("tex1", this->fbo1.getTexture(), 1);

this->shader.setUniformTexture("tex2", this->fbo2.getTexture(), 2);

this->shader.setUniformTexture("tex3", this->fbo3.getTexture(), 3);

ofDrawRectangle(glm::vec2(0, 0), ofGetWidth(), ofGetHeight());

this->shader.end();

}

//--------------------------------------------------------------

void ofApp::draw_arrow(glm::vec2 location, glm::vec2 next_location, float size) {

auto angle = std::atan2(next_location.y - location.y, next_location.x - location.x);

ofFill();

ofBeginShape();

ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));

ofEndShape();

ofBeginShape();

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);

ofEndShape();

}

//--------------------------------------------------------------

int main() {

ofGLWindowSettings settings;

settings.setGLVersion(3, 2);

settings.setSize(720, 720);

ofCreateWindow(settings);

ofRunApp(new ofApp());

}

#version 150

uniform mat4 modelViewProjectionMatrix;
in vec4 position;

void main(){
	gl_Position = modelViewProjectionMatrix * position;
}

#version 150

uniform mat4 modelViewProjectionMatrix;

in vec4 position;

void main(){

gl_Position = modelViewProjectionMatrix * position;

}

#version 150

uniform float time;
uniform vec2 resolution;
uniform sampler2DRect tex1;
uniform sampler2DRect tex2;
uniform sampler2DRect tex3;

in vec2 texCoordVarying;
out vec4 outputColor;

void main() {

  vec4 t1 = texture(tex1, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));
  vec4 t2 = texture(tex2, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));
  vec4 t3 = texture(tex3, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));
  
  vec4 c;
  if((t1 == t2 && t1 == t3) || (t1 == t2 && t3 == vec4(0.0)) || (t2 == t3 && t1 == vec4(0.0)) || (t1 == t3 && t2 == vec4(0.0))){
  
	c = vec4(vec3(0.937), 1.0);
  }else{

  	c = vec4(vec3(0.153), 1.0);
  }
  
  outputColor = c;
}

#version 150

uniform float time;

uniform vec2 resolution;

uniform sampler2DRect tex1;

uniform sampler2DRect tex2;

uniform sampler2DRect tex3;

in vec2 texCoordVarying;

out vec4 outputColor;

void main() {

vec4 t1 = texture(tex1, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));

vec4 t2 = texture(tex2, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));

vec4 t3 = texture(tex3, vec2(gl_FragCoord.x, resolution.y - gl_FragCoord.y));

vec4 c;

if((t1 == t2 && t1 == t3) || (t1 == t2 && t3 == vec4(0.0)) || (t2 == t3 && t1 == vec4(0.0)) || (t1 == t3 && t2 == vec4(0.0))){

c = vec4(vec3(0.937), 1.0);

}else{

c = vec4(vec3(0.153), 1.0);

}

outputColor = c;

}

[ Link ]
https://github.com/junkiyoshi/Insta20210913

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