use uniform buffer

src/MsdfAtlasLayerCombo.cpp

@@ -1,6 +1,10 @@
 #include "MsdfAtlasLayerCombo.h"
 #include "AtlasLayerCombo.h"
+#include "MsdfLayer.h"
 #include "Utils.h"
+#include "ofFileUtils.h"
+#include <GL/glext.h>
+#include <GLES3/gl3.h>
 
 namespace ofxVariableLab {
 
@@ -20,7 +24,11 @@ void MsdfAtlasLayerCombo::setup(const ComboIdentifier & layerIdentifier,
 
     msdfShader = make_shared <ofShader>();
     #ifdef TARGET_EMSCRIPTEN
+        if(ofFile("shaders/ES3/msdf/shader.frag").exists()){
+            msdfShader->load("shaders/ES3/msdf/shader");
+        }else{
             msdfShader->load("ofxMsdfgen/shaders/mix/ES3/shader");
+        }
     #else
         msdfShader->load("ofxMsdfgen/shaders/mix/GL3/shader");
     #endif
@@ -35,6 +43,28 @@ void MsdfAtlasLayerCombo::update(){
         atlas->generate(useCache, saveToCache);
         isDirty = false;
     }
+    if(!uboIsSetup){
+        setupUbo();
+    }
+}
+
+void MsdfAtlasLayerCombo::setupUbo(){
+    msdfShader->begin();
+    GLint prog = 0;
+    glGetIntegerv(GL_CURRENT_PROGRAM, &prog);
+    msdfShader->end();
+
+    glGenBuffers(1, &uboName);
+    uboIndex = glGetUniformBlockIndex(prog, "ubo");
+    glBindBufferBase(GL_UNIFORM_BUFFER, 0, uboName);
+    MsdfLayer::UboParameters up;
+    glBufferData(GL_UNIFORM_BUFFER, sizeof(glm::vec4) * 8, NULL, GL_DYNAMIC_DRAW);
+    glUniformBlockBinding(prog, uboIndex, 0);
+    for(const auto & layer : layers){
+        layer->uboName = uboName;
+        layer->uboIndex = uboIndex;
+    }
+    uboIsSetup = true;
 }
 
 void MsdfAtlasLayerCombo::careForChild(shared_ptr <Layer> layer){
@@ -44,6 +74,8 @@ void MsdfAtlasLayerCombo::careForChild(shared_ptr <Layer> layer){
     msdfLayer->setDirtyDirty(true);
     msdfLayer->setAtlas(this->atlas);
     msdfLayer->setShader(msdfShader);
+    msdfLayer->uboName = uboName;
+    msdfLayer->uboIndex = uboIndex;
     msdfLayer->scaleFactor = scaleFactor;
     auto & as = atlas->settings;
     for(const char c : layer->getProps().text){

src/MsdfAtlasLayerCombo.h

@@ -34,5 +34,10 @@ class MsdfAtlasLayerCombo : public AtlasLayerCombo {
         ComboIdentifier identifier;
         bool isDirty = false;
         float scaleFactor = 1.0;
+
+        GLuint uboName;
+        GLint uboIndex;
+        void setupUbo();
+        bool uboIsSetup = false;
 };
 }

src/MsdfLayer.cpp

@@ -136,6 +136,7 @@ void MsdfLayer::draw(glm::vec3 position){
         //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);
@@ -143,6 +144,7 @@ void MsdfLayer::draw(glm::vec3 position){
         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();
@@ -176,7 +178,7 @@ void MsdfLayer::drawCharacter(const char character,
 
     shader->begin();
     shader->setUniformTexture("msdf", atlasImage.getTexture(), 0);
-    shader->setUniform2f("unitRange", unitRange);
+    //shader->setUniform2f("unitRange", unitRange);
     shader->end();
 
     ofPushMatrix();
@@ -244,12 +246,15 @@ void MsdfLayer::drawCharacter(const char character,
     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);
+    uboParameters.unitRange = unitRange;
+    uboParameters.fontColor = color;
+    uboParameters.translation_a = translation_a;
+    uboParameters.translation_b = translation_b;
+    uboParameters.scale_a = scale_a;
+    uboParameters.scale_b = scale_b;
+    uboParameters.mix = mix;
+    glBindBufferBase(GL_UNIFORM_BUFFER, 0, uboName);
+    glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(UboParameters), &uboParameters);
     ofRotateDeg(rotation, 0, 0, 1);
     atlasImage.draw(0, 0, w * scale, h * scale);
     shader->end();

src/MsdfLayer.h

@@ -11,6 +11,16 @@ namespace ofxVariableLab {
 
 class MsdfLayer : public Layer {
     public:
+        struct UboParameters {
+            glm::vec4 fontColor;
+            glm::vec4 bgColor;
+            glm::vec2 unitRange;
+            glm::vec2 translation_a;
+            glm::vec2 scale_a;
+            glm::vec2 translation_b;
+            glm::vec2 scale_b;
+            float mix;
+        };
         void setup(const LayerSettings & settings = LayerSettings()) override;
         void update() override;
         void draw(glm::vec3 position = glm::vec3(0, 0, 0)) override;
@@ -53,6 +63,9 @@ class MsdfLayer : public Layer {
         string id = "";
         VFlipState vFlip = V_FLIP_UNKNOWN;
         float scaleFactor = 1.0;
+        GLuint uboName;
+        GLint uboIndex;
+        UboParameters uboParameters;
 
     private:
         Props lastProps;