draw debug sdfatlas

data/ofxGPUFont/shaders/GL3/font.frag

@@ -12,6 +12,7 @@ struct Curve {
 
 uniform isamplerBuffer glyphs;
 uniform samplerBuffer curves;
+uniform sampler2D iChannel0;
 uniform vec4 color;
 
 

example/src/gpufont/font.hpp

@@ -735,8 +735,8 @@ class Font {
 
                 glActiveTexture(GL_TEXTURE0);
             #else
-                glyphBuffer = glGetUniformLocation(program, "glyphs");
-                glUniform1i(glyphBuffer, 2);
+                GLint toast = glGetUniformLocation(program, "glyphs");
+                glUniform1i(toast, 2);
                 curveBuffer = glGetUniformLocation(program, "curves");
                 glUniform1i(curveBuffer, 1);
 

example/src/ofApp.cpp

@@ -2,6 +2,7 @@
 #include "ofAppRunner.h"
 #include "ofGraphics.h"
 #include "ofTexture.h"
+#include "ofUtils.h"
 
 #ifdef TARGET_EMSCRIPTEN
  #include <GLES/gl.h>
@@ -76,7 +77,7 @@ is going to be difficult. I don’t know yet where to
 start. I hope to capture something essential.)DONE";
 
     #ifdef TARGET_EMSCRIPTEN
-        string shaderDir = "data/ofxGPUFont/shaders/ES3";
+        string shaderDir = "data/ofxGPUFont/shaders/DEBUG_ES3";
     #else
         string shaderDir = "data/ofxGPUFont/shaders/GL3";
     #endif
@@ -118,16 +119,20 @@ start. I hope to capture something essential.)DONE";
          << " | Minor(" << ofToString(glMajor) << ")"
          << endl;
 
+    auto & r = ofGetCurrentRenderer();
+    cout << "Render type " << r->getType() << endl;
+    backgroundColor = ofFloatColor::red;
+
 }
 
 //--------------------------------------------------------------
 void ofApp::update(){
 
 }
-bool hasDrawnOnce = false;
+
 //--------------------------------------------------------------
 void ofApp::draw(){
-    if(!hasDrawnOnce){
+    //ofBackground(backgroundColor);
     GLuint location;
 
     int width = ofGetWidth();
@@ -146,8 +151,6 @@ void ofApp::draw(){
     //glUseProgram(0);
     //}
 
-        ofBackground(ofColor::pink);
-
     // Uses premultiplied-alpha.
     glEnable(GL_BLEND);
     glBlendEquation(GL_FUNC_ADD);
@@ -184,16 +187,59 @@ void ofApp::draw(){
         location = glGetUniformLocation(program, "enableControlPointsVisualization");
         glUniform1i(location, enableControlPointsVisualization);
 
+        debug_font_location = glGetUniformLocation(program, "iChannel0");
+        glUniform1i(debug_font_location, 3);
+
+        if(!debug_font.isAllocated()){
+            debug_font.setUseTexture(false);
+            debug_font.load("sdfatlas.png");
+            //debug_font.getTexture().getTextureData().textureID = debug_font_location;
+            //debug_font.getTexture().getTextureData().textureTarget = GL_TEXTURE_2D;
+            //debug_font.bind(debug_font_location);
+            //debug_font.update();
+            //debug_font.unbind(debug_font_location);
+            glGenTextures(1, &debug_font_name);
+            glActiveTexture(GL_TEXTURE3);
+            glBindTexture(GL_TEXTURE_2D, debug_font_name);
+
+            ofPixels & pixels = debug_font.getPixels();
+            glTexImage2D(GL_TEXTURE_2D,
+                         0,
+                         GL_RGBA,
+                         pixels.getWidth(),
+                         pixels.getHeight(),
+                         0,
+                         GL_RGBA,
+                         GL_UNSIGNED_BYTE,
+                         pixels.getData());
+            glGenerateMipmap(GL_TEXTURE_2D);
+        }
+        //debug_font.bind(debug_font_location);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, 0);
+
         float cx = 0.5f * (bb.minX + bb.maxX);
         float cy = 0.5f * (bb.minY + bb.maxY);
         font->draw(-cx, -cy, 0, mainText);
         glUseProgram(currentProgram);
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, 0);
     }
 
     glDisable(GL_BLEND);
 
     ofDrawBitmapStringHighlight("fps: " + ofToString(ofGetFrameRate()), 20, 20);
-    }
+    backgroundColor = ofFloatColor::pink;
+}
+
+void ofApp::exit(){
+    glDeleteTextures(1, &debug_font_location);
 }
 
 //--------------------------------------------------------------

example/src/ofApp.h

@@ -69,6 +69,8 @@ class ofApp : public ofBaseApp {
         void dragEvent(ofDragInfo dragInfo);
         void gotMessage(ofMessage msg);
 
+        void exit();
+
         unique_ptr <Font> font;
         FT_Library library;
 
@@ -100,4 +102,9 @@ class ofApp : public ofBaseApp {
         bool enableControlPointsVisualization = false;
 
         bool showHelp = true;
+
+        ofImage debug_font;
+        GLuint debug_font_location;
+        GLuint debug_font_name;
+        ofFloatColor backgroundColor;
 };