ofxVariableLab/src/MsdfLayer.cpp

#include "MsdfLayer.h"
#include "Atlas.h"
#include "Utils.h"
#include "fwd.hpp"
#include "ofGraphics.h"
#include "ofUtils.h"

namespace ofxVariableLab {

void MsdfLayer::setup(const LayerSettings & settings){
    this->settings = settings;
    if(id == ""){
        id = ofToString(Layer::n_layers);
        n_layers++;
    }
}

void MsdfLayer::update(){
    if(isDirty){
        isDirty = false;
    }
}

void MsdfLayer::draw(glm::vec3 position){
    const ofImage & atlasImage = atlas->getAtlasImage();
    ofDisableAlphaBlending();
    ofEnableDepthTest();
    float pixelRange = 2;
    int atlas_w = atlasImage.getWidth();
    int atlas_h = atlasImage.getHeight();
    glm::vec2 unitRange = glm::vec2(pixelRange) / glm::vec2(atlas_w, atlas_h);

    shader->begin();
    shader->setUniformTexture("msdf", atlasImage.getTexture(), 0);
    shader->setUniform4f("fontColor", ofFloatColor::white);
    shader->setUniform2f("unitRange", unitRange);
    shader->end();

    ofPushMatrix();
    ofTranslate(position);
    ofPushStyle();
    ofSetColor(ofColor::pink);
    ofDrawLine(glm::vec2(0, 0), glm::vec2(ofGetWidth(), 0));
    ofPopStyle();
    char previous_c;
    bool firstLetter = true;

    // set variation axis
    const float swing_sin = sin(ofGetElapsedTimef() * 1);
    const float swing_01 = ofMap(swing_sin, -1, 1, 0, 1);
    const vector <ofxMsdfgen::FontVariationAxis> & variationAxisAvailable = atlas->getVariationAxesAvailable();
    const string var_name = variationAxisAvailable[0].name;
    const float var_value = ofMap(swing_01, 0, 1,
                                  variationAxisAvailable[0].minValue,
                                  variationAxisAvailable[0].maxValue);

    int i = 0;
    for(const char c : propsBuffer[0].text){
        float mix = -1;
        ofxMsdfgen::GlyphGeometry gg_a;
        ofxMsdfgen::GlyphGeometry gg_b;

        bool success = atlas->getGlyphGeometryPair(c,
                                                   {var_name, var_value},
                                                   gg_a,
                                                   gg_b,
                                                   mix);
        if(!success){
            ofLogError("MsdfLayer::draw") << "could not get glyphGeometryPair" << endl;
        }
        int x_a, y_a, w_a, h_a;
        int x_b, y_b, w_b, h_b;
        gg_a.getBoxRect(x_a, y_a, w_a, h_a);
        gg_b.getBoxRect(x_b, y_b, w_b, h_b);
        if(y_a < 0 || y_b < 0){
            // FIXME: make sure this does not happen
            ofLogError("MsdfLayer::draw") << "y smaller 0, this is not good" << endl;
        }
        ofPushStyle();
        double pl_a, pb_a, pr_a, pt_a;
        double pl_b, pb_b, pr_b, pt_b;
        gg_a.getQuadPlaneBounds(pl_a, pb_a, pr_a, pt_a);
        gg_b.getQuadPlaneBounds(pl_b, pb_b, pr_b, pt_b);

        double advance_a = gg_a.getAdvance();
        double advance_b = gg_b.getAdvance();

        float w = glm::mix(float(w_a), float(w_b), mix);
        float h = glm::mix(float(h_a), float(h_b), mix);
        float pl = glm::mix(float(pl_a), float(pl_b), mix);
        //float pb = glm::mix(float(pb_a), float(pb_b), mix);
        //float pr = glm::mix(float(pr_a), float(pr_b), mix);
        float pt = glm::mix(float(pt_a), float(pt_b), mix);
        double advance = glm::mix(advance_a, advance_b, mix);

        ofPushMatrix();
        float magic = atlas->settings.scale;
        ofSetColor(ofFloatColor(1, 1, 1, 1));
        ofTranslate(pl * magic, 0, 0);
        getVFlip(settings.vFlipBehaviour,
                 ofGetCurrentOrientationMatrix(),
                 vFlip);
        if(vFlip == V_FLIP_OFF){
            ofTranslate(pl * magic, (pt * magic) + (-1 * h), 0);
        }else{
            ofTranslate(pl * magic, -1 * pt * magic, 0);
        }

        //if(settings.vFlip){
        //ofTranslate(0, -1 * pt * magic, 0);
        //}else{
        //ofTranslate(0, -1 * h, 0);
        //ofTranslate(0, 1 * pt * magic, 0);
        //}

        if(!firstLetter){
            //cout << "this is being printed" << endl;
            auto & fontGeometry = atlas->getFontGeometry();
            const std::map <std::pair <int, int>, double> kerning = fontGeometry.getKerning();
            ofxMsdfgen::GlyphGeometry gg_previous = atlas->getGlyphGeometry(c);

            std::map <std::pair <int, int>, double>::const_iterator it = kerning.find(std::make_pair <int, int>(gg_previous.getIndex(), gg_a.getIndex()));
            if(it != kerning.end()){
                advance += it->second;
                ofDrawBitmapStringHighlight(ofToString(it->second), 0, 200, ofColor::black, ofColor::pink);
            }
        }
        glm::vec2 translation_a = glm::vec2(float(x_a) / float(atlas_w),
                                            float(y_a) / float(atlas_h));
        glm::vec2 scale_a = glm::vec2(float(w_a) / float(atlas_w),
                                      float(h_a) / float(atlas_h));
        glm::vec2 translation_b = glm::vec2(float(x_b) / float(atlas_w),
                                            float(y_b) / float(atlas_h));
        glm::vec2 scale_b = glm::vec2(float(w_b) / float(atlas_w),
                                      float(h_b) / float(atlas_h));
        //if(firstLetter){
        //cout << "translation_a: " << ofToString(translation_a) << endl;
        //cout << "scale_a: " << ofToString(scale_a) << endl;
        //}
        shader->begin();
        shader->setUniform4f("fontColor", ofFloatColor::yellow);
        shader->setUniform2f("translation_a", translation_a);
        shader->setUniform2f("scale_a", scale_a);
        shader->setUniform2f("translation_b", translation_b);
        shader->setUniform2f("scale_b", scale_b);
        shader->setUniform1f("msdf_mix", mix);
        atlasImage.draw(0, 0, w, h);
        shader->end();
        ofPopMatrix();
        ofPopStyle();
        ofTranslate(advance * magic, 0, 0);
        ofTranslate(-1 * pl * magic, 0, 0);
        previous_c = c;
        if(firstLetter){
            firstLetter = false;
        }
        i++;
    }
    ofPopMatrix();
    ofDisableDepthTest();
    ofEnableAlphaBlending();
}
void MsdfLayer::drawCharacter(const char character,
                              glm::vec3 position,
                              glm::vec4 color,
                              float rotation,
                              float scale,
                              ofxVariableLab::FontVariation fontVariation){
    const ofImage & atlasImage = atlas->getAtlasImage();
    ofDisableAlphaBlending();
    ofEnableDepthTest();
    float pixelRange = 2;
    int atlas_w = atlasImage.getWidth();
    int atlas_h = atlasImage.getHeight();
    glm::vec2 unitRange = glm::vec2(pixelRange) / glm::vec2(atlas_w, atlas_h);

    shader->begin();
    shader->setUniformTexture("msdf", atlasImage.getTexture(), 0);
    shader->setUniform2f("unitRange", unitRange);
    shader->end();

    ofPushMatrix();
    ofTranslate(position);
    ofPushStyle();

    float mix = -1;
    ofxMsdfgen::GlyphGeometry gg_a;
    ofxMsdfgen::GlyphGeometry gg_b;

    ofxMsdfgen::FontVariation fv{
        fontVariation.name,
        fontVariation.value
    };

    bool success = atlas->getGlyphGeometryPair(character,
                                               fv,
                                               gg_a,
                                               gg_b,
                                               mix);
    if(!success){
        ofLogError("MsdfLayer::draw") << "could not get glyphGeometryPair" << endl;
    }
    int x_a, y_a, w_a, h_a;
    int x_b, y_b, w_b, h_b;
    gg_a.getBoxRect(x_a, y_a, w_a, h_a);
    gg_b.getBoxRect(x_b, y_b, w_b, h_b);
    if(y_a < 0 || y_b < 0){
        // FIXME: make sure this does not happen
        ofLogError("MsdfLayer::draw") << "y smaller 0, this is not good" << endl;
    }
    ofPushStyle();
    double pl_a, pb_a, pr_a, pt_a;
    double pl_b, pb_b, pr_b, pt_b;
    gg_a.getQuadPlaneBounds(pl_a, pb_a, pr_a, pt_a);
    gg_b.getQuadPlaneBounds(pl_b, pb_b, pr_b, pt_b);

    double advance_a = gg_a.getAdvance();
    double advance_b = gg_b.getAdvance();

    float w = glm::mix(float(w_a), float(w_b), mix);
    float h = glm::mix(float(h_a), float(h_b), mix);
    float pl = glm::mix(float(pl_a), float(pl_b), mix);
    float pt = glm::mix(float(pt_a), float(pt_b), mix);
    double advance = glm::mix(advance_a, advance_b, mix);

    ofPushMatrix();
    float magic = atlas->settings.scale;
    ofSetColor(ofFloatColor(1, 1, 1, 1));
    getVFlip(settings.vFlipBehaviour,
             ofGetCurrentOrientationMatrix(),
             vFlip);
    if(vFlip == V_FLIP_OFF){
        ofTranslate(pl * magic, (pt * magic) + (-1 * h), 0);
    }else{
        ofTranslate(pl * magic, -1 * pt * magic, 0);
    }

    glm::vec2 translation_a = glm::vec2(float(x_a) / float(atlas_w),
                                        float(y_a) / float(atlas_h));
    glm::vec2 scale_a = glm::vec2(float(w_a) / float(atlas_w),
                                  float(h_a) / float(atlas_h));
    glm::vec2 translation_b = glm::vec2(float(x_b) / float(atlas_w),
                                        float(y_b) / float(atlas_h));
    glm::vec2 scale_b = glm::vec2(float(w_b) / float(atlas_w),
                                  float(h_b) / float(atlas_h));
    shader->begin();
    shader->setUniform4f("fontColor", color);
    shader->setUniform2f("translation_a", translation_a);
    shader->setUniform2f("scale_a", scale_a);
    shader->setUniform2f("translation_b", translation_b);
    shader->setUniform2f("scale_b", scale_b);
    shader->setUniform1f("msdf_mix", mix);
    ofRotateDeg(rotation, 0, 0, 1);
    atlasImage.draw(0, 0, w * scale, h * scale);
    shader->end();
    ofPopMatrix();
    ofPopStyle();
    ofTranslate(advance * magic, 0, 0);
    ofTranslate(-1 * pl * magic, 0, 0);

    ofPopStyle();
    ofPopMatrix();
    ofDisableDepthTest();
    ofEnableAlphaBlending();
}

void MsdfLayer::setShader(shared_ptr <ofShader> _shader){
    shader = _shader;
}
shared_ptr <ofShader> MsdfLayer::getShader() const {
    return shader;
}
const Layer::Type & MsdfLayer::getType() const {
    return type;
}
void MsdfLayer::setVFlip(const VFlipState vFlip){
    this->vFlip = vFlip;
}

void MsdfLayer::setAtlas(shared_ptr <ofxMsdfgen::Atlas> _atlas){
    atlas = _atlas;
    // TODO: this does not seem proper
    propsBuffer[0].fontSize_px = atlas->settings.scale;
}
shared_ptr <ofxMsdfgen::Atlas> MsdfLayer::getAtlas() const {
    return atlas;
}
void MsdfLayer::setProps(const Props & props){
    while(propsBuffer.size() > max(0, int(settings.maxBufferSize - 1))){
        propsBuffer.pop_back();
    }
    propsBuffer.push_front(props);
}
const Layer::Props & MsdfLayer::getProps() const {
    return propsBuffer[0];
}
void MsdfLayer::clearPropsBuffer(){
    propsBuffer.clear();
}
void MsdfLayer::setId(const LayerID & id){
    this->id = id;
}
const LayerID & MsdfLayer::getId(){
    return id;
}
}