Font cache

include/JGL/FontCache.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include <vector>
+#include <glad/glad.h>
+
+namespace JGL {
+    class CachedGlyph;
+    class CachedFont;
+    class FontCache;
+}
+
+class JGL::CachedGlyph {
+private:
+    GLuint texture = 0;
+    char character;
+public:
+    int x2offset = 0, y2offset = 0, w = 0, h = 0;
+    float advanceX = 0, advanceY = 0;
+
+    //CachedGlyph(GLuint texture_id, char c);
+    CachedGlyph(GLuint texture_id, char c, float x2o, float y2o, float w, float h, float advX, float advY);
+    char getCharacter();
+    const GLuint* getTexture();
+};
+
+class JGL::CachedFont {
+private:
+    std::vector<CachedGlyph*> glyphs{};
+    unsigned int font_size = 0;
+    unsigned int font_index = 0;
+public:
+    void appendGlyph(CachedGlyph* glyph);
+    void eraseGlyph(CachedGlyph* glyph);
+    void eraseGlyph(char c);
+    void eraseGlyph(GLuint texture_id);
+    unsigned int getFontSize();
+    unsigned int getFontIndex();
+    CachedGlyph* getGlyph(char c);
+    std::vector<CachedGlyph*>* getGlyphs();
+    CachedFont(unsigned int font_size, unsigned int font_index);
+};
+
+class JGL::FontCache {
+private:
+    std::vector<CachedFont*> cachedFonts = {};
+public:
+    std::vector<CachedFont*>* getFonts();
+    CachedFont* getFont(unsigned int font_size, unsigned int font_index);
+    void appendFont(CachedFont* font);
+    void newFont(unsigned int font_size, unsigned int font_index);
+    void eraseFont(CachedFont* font);
+    void purgeCache();
+};

include/JGL/JGL.h

@@ -6,6 +6,7 @@
 #include <string>
 #include <iostream>
 #include <JGL/Color3.h>
+#include <JGL/FontCache.h>
 #include <J3ML/LinearAlgebra.h>
 #include <J3ML/LinearAlgebra/Vector2.h>
 #include <J3ML/LinearAlgebra/Vector3.h>
@@ -49,7 +50,9 @@ namespace JGL {
     };
 
     bool InitTextEngine();
+    inline FontCache fontCache;
     int LoadFont(const std::string& font_path);
+
     void UnloadFont(int font_index);
     // TODO: implement correct coloring
 

main.cpp

@@ -34,14 +34,9 @@ class JGLDemoWindow : public ReWindow::RWindow
 public:
 
     JGLDemoWindow() : ReWindow::RWindow() {}
-    JGLDemoWindow(const std::string& title, int width, int height) :
-            ReWindow::RWindow(title, width, height)
-    {
+    JGLDemoWindow(const std::string& title, int width, int height) : ReWindow::RWindow(title, width, height){}
 
-    }
-
-    void initGL()
-    {
+    void initGL() {
         gladLoadGL();
 
         glMatrixMode(GL_PROJECTION);
@@ -64,7 +59,6 @@ public:
 
     void display() {
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
         glMatrixMode(GL_PROJECTION);
         glLoadIdentity();
         glOrtho(0, getSize().x, getSize().y, 0, -1, 1);

src/FontCache.cpp

@@ -0,0 +1,119 @@
+#include <JGL/FontCache.h>
+
+using namespace JGL;
+
+char CachedGlyph::getCharacter() {
+    return character;
+}
+
+const GLuint* CachedGlyph::getTexture() {
+    return &texture;
+}
+
+CachedGlyph::CachedGlyph(GLuint texture_id, char c, float x2offset, float y2offset, float w, float h, float advanceX, float advanceY) {
+    texture = texture_id;
+    character = c;
+    this->x2offset = x2offset;
+    this->y2offset = y2offset;
+    this->w = w;
+    this->h = h;
+    this->advanceX = advanceX;
+    this->advanceY = advanceY;
+}
+
+void JGL::CachedFont::appendGlyph(JGL::CachedGlyph* glyph) {
+    glyphs.push_back(glyph);
+}
+
+unsigned int JGL::CachedFont::getFontSize() {
+    return font_size;
+}
+
+unsigned int JGL::CachedFont::getFontIndex() {
+    return font_index;
+}
+
+CachedGlyph* JGL::CachedFont::getGlyph(char c) {
+    for (const auto& g : glyphs)
+        if (c == g->getCharacter())
+            return g;
+    return nullptr;
+}
+
+CachedFont::CachedFont(unsigned int font_size, unsigned int font_index) {
+    this->font_size = font_size;
+    this->font_index = font_index;
+}
+
+void CachedFont::eraseGlyph(CachedGlyph* glyph) {
+    if (glyph == nullptr)
+        return;
+
+    for (int i = 0; i < glyphs.size(); i++)
+        if (glyphs[i] == glyph)
+            glDeleteTextures(1, glyphs[i]->getTexture()),
+            delete glyphs[i],
+            glyphs.erase(glyphs.begin() + i);
+}
+
+void CachedFont::eraseGlyph(char c) {
+    for (int i = 0; i < glyphs.size(); i++)
+        if (glyphs[i]->getCharacter() == c)
+            glDeleteTextures(1, glyphs[i]->getTexture()),
+            delete glyphs[i],
+            glyphs.erase(glyphs.begin() + i);
+}
+
+void CachedFont::eraseGlyph(GLuint texture_id) {
+    for (int i = 0; i < glyphs.size(); i++)
+        if (glyphs[i]->getTexture() == &texture_id)
+            glDeleteTextures(1, glyphs[i]->getTexture()),
+            delete glyphs[i],
+            glyphs.erase(glyphs.begin() + i);
+}
+
+std::vector<CachedGlyph*>* CachedFont::getGlyphs() {
+    return &glyphs;
+}
+
+void FontCache::appendFont(CachedFont* font) {
+    cachedFonts.push_back(font);
+}
+
+void FontCache::newFont(unsigned int font_size, unsigned int font_index) {
+    auto* font = new CachedFont(font_size, font_index);
+    cachedFonts.push_back(font);
+}
+
+void FontCache::eraseFont(CachedFont* font) {
+    for (int i = 0; i < cachedFonts.size(); i++) {
+        if (cachedFonts[i] == font) {
+            for (auto& g: *cachedFonts[i]->getGlyphs())
+                cachedFonts[i]->eraseGlyph(g);
+
+            delete cachedFonts[i];
+            cachedFonts.erase(cachedFonts.begin() + i);
+        }
+    }
+}
+
+void FontCache::purgeCache() {
+    //Remove every font from the cache.
+    for (const auto& font : cachedFonts)
+        eraseFont(font);
+    cachedFonts = {};
+}
+
+std::vector<CachedFont*>* FontCache::getFonts() {
+    return &cachedFonts;
+}
+
+CachedFont* FontCache::getFont(unsigned int font_size, unsigned int font_index) {
+    if (cachedFonts.empty())
+        return nullptr;
+
+    for (auto* f : cachedFonts)
+        if (f->getFontIndex() == font_index && f->getFontSize() == font_size)
+            return f;
+    return nullptr;
+}

src/JGL.cpp

@@ -37,6 +37,7 @@ namespace JGL
     int LoadFont(const std::string &font_path) {
         if (ft == nullptr)
             return -1;
+
         Font font;
         if (FT_New_Face(ft, font_path.c_str(), 0, &font.face)) {
             std::cout << "Error::FREETYPE: Failed to load font!" << std::endl;
@@ -47,9 +48,9 @@ namespace JGL
             for (const auto& f : faces)
                 if (f.index >= newIndex)
                     newIndex = f.index + 1;
+
         font.index = newIndex;
         faces.push_back(font);
-
         std::cout << "Loaded font from " << font_path << " with index " << newIndex << std::endl;
         return newIndex;
     }
@@ -61,13 +62,12 @@ namespace JGL
                 faces.erase(faces.begin() + i);
     }
 
-    namespace J2D
-    {
+    namespace J2D {
         void FillRect2D(const Color3 &color, const Vector2 &pos, const Vector2 &size) {
             auto vp_pos = pos;
             auto vp_size = size;
             glBegin(GL_QUADS);
-            glColor3f(color.r/255.f, color.g/255.f, color.b/255.f);
+            glColor3f(color.r / 255.f, color.g / 255.f, color.b / 255.f);
             glVertex2f(vp_pos.x, vp_pos.y);
             glVertex2f(vp_pos.x, vp_pos.y + vp_size.y);
             glVertex2f(vp_pos.x + vp_size.x, vp_pos.y + vp_size.y);
@@ -122,9 +122,8 @@ namespace JGL
             glBegin(GL_LINE_LOOP);
             GLfloat angle;
             glColor3f(color.r, color.g, color.b);
-            float step = (2.f * M_PI) / (float)subdivisions;
-            for (angle = 0.0f; angle < (2.f * M_PI); angle += step)
-            {
+            float step = (2.f * M_PI) / (float) subdivisions;
+            for (angle = 0.0f; angle < (2.f * M_PI); angle += step) {
                 GLfloat x = radius * sin(angle);
                 GLfloat y = radius * cos(angle);
                 x += center.x;
@@ -138,9 +137,8 @@ namespace JGL
             glBegin(GL_POLYGON);
             GLfloat angle;
             glColor3f(color.r, color.g, color.b);
-            float step = (2.f * M_PI) / (float)subdivisions;
-            for (angle = 0.0f; angle < (2.f * M_PI); angle += step)
-            {
+            float step = (2.f * M_PI) / (float) subdivisions;
+            for (angle = 0.0f; angle < (2.f * M_PI); angle += step) {
                 GLfloat x = radius * sin(angle);
                 GLfloat y = radius * cos(angle);
                 x += center.x;
@@ -150,20 +148,18 @@ namespace JGL
             glEnd();
         }
 
-        void OutlineTriangle2D(const Color3& color, const Triangle2D& tri)
-        {
+        void OutlineTriangle2D(const Color3 &color, const Triangle2D &tri) {
             glBegin(GL_LINE_LOOP);
-            glColor3f(color.r/255.f, color.g/255.f, color.b/255.f);
+            glColor3f(color.r / 255.f, color.g / 255.f, color.b / 255.f);
             glVertex2f(tri.A.x, tri.A.y);
             glVertex2f(tri.B.x, tri.B.y);
             glVertex2f(tri.C.x, tri.C.y);
             glEnd();
         }
 
-        void FillTriangle2D(const Color3& color, const Triangle2D& tri)
-        {
+        void FillTriangle2D(const Color3 &color, const Triangle2D &tri) {
             glBegin(GL_LINE_LOOP);
-            glColor3f(color.r/255.f, color.g/255.f, color.b/255.f);
+            glColor3f(color.r / 255.f, color.g / 255.f, color.b / 255.f);
             glVertex2f(tri.A.x, tri.A.y);
             glVertex2f(tri.B.x, tri.B.y);
             glVertex2f(tri.C.x, tri.C.y);
@@ -174,46 +170,79 @@ namespace JGL
             glUseProgram(0); // Fixed-function pipeline.
 
             Font font{};
+            CachedFont* cachedFont = fontCache.getFont(size, font_index);
+
+            //If the font doesn't exist in the cache yet.
+            if (!cachedFont) {
+                fontCache.newFont(size, font_index);
+                cachedFont = fontCache.getFont(size, font_index);
+            }
+
+            //Set up the regular font.
             for (const auto& f : faces)
                 if (f.index == font_index)
                     font = f;
-            if (font.face == NULL) {
-                std::cout << "null font" << std::endl;
+            if (font.face == nullptr)
                 return;
-            }
 
             GLfloat currentColor[4];
             glGetFloatv(GL_CURRENT_COLOR, currentColor);
 
-            glColor3f(color.r/255.f, color.g/255.f, color.b/255.f);
+            glColor4f(color.r / 255.f, color.g / 255.f, color.b / 255.f, 1.0f);
 
             FT_Set_Pixel_Sizes(font.face, 0, size);
 
             std::vector<GLuint> textures(text.length());
-            for (int i = 0; i < text.length(); i++)
-            {
-                if (FT_Load_Char(font.face, text.c_str()[i], FT_LOAD_RENDER))
-                    continue;
 
-                FT_GlyphSlot g = font.face->glyph;
-                glEnable(GL_BLEND);
-                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-                glActiveTexture(GL_TEXTURE0);
-                glEnable(GL_TEXTURE_2D);
-                glGenTextures(1, &textures.at(i));
-                glBindTexture(GL_TEXTURE_2D, textures[i]);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
-                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
-                glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, g->bitmap.width, g->bitmap.rows, 0, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+            glEnable(GL_TEXTURE_2D);
 
-                float x2 = x + g->bitmap_left * scale;
-                float y2 = -y - g->bitmap_top * scale; // Adjust y-coordinate
-                float w = g->bitmap.width * scale;
-                float h = g->bitmap.rows * scale;
+            //For each character
+            for (int i = 0; i < text.length(); i++) {
+                float x2, y2, w, h;
+                //If the font is in the cache already.
+                if (cachedFont->getGlyph(text.c_str()[i])) {
+                    CachedGlyph* glyph = cachedFont->getGlyph(text.c_str()[i]);
+
+                    glBindTexture(GL_TEXTURE_2D, *glyph->getTexture());
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+
+                    x2 = x + glyph->x2offset * scale;
+                    y2 = -y - glyph->y2offset * scale; // Adjust y-coordinate
+                    w = glyph->w * scale;
+                    h = glyph->h * scale;
+                    x += glyph->advanceX * scale;
+                    y += glyph->advanceY * scale;
+
+                } else {
+                    if (FT_Load_Char(font.face, text.c_str()[i], FT_LOAD_RENDER))
+                        continue;
+
+                    FT_GlyphSlot g = font.face->glyph;
+                    glGenTextures(1, &textures.at(i));
+                    glBindTexture(GL_TEXTURE_2D, textures[i]);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+                    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+                    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, g->bitmap.width, g->bitmap.rows, 0, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
+
+                    x2 = x + g->bitmap_left * scale;
+                    y2 = -y - g->bitmap_top * scale; // Adjust y-coordinate
+                    w = g->bitmap.width * scale;
+                    h = g->bitmap.rows * scale;
+                    x += (g->advance.x >> 6) * scale;
+                    y += (g->advance.y >> 6) * scale;
+                    cachedFont->appendGlyph(new CachedGlyph(textures.at(i), text.c_str()[i], g->bitmap_left, g->bitmap_top, g->bitmap.width, g->bitmap.rows, (g->advance.x >> 6), (g->advance.y >> 6)));
+                }
 
                 glBegin(GL_TRIANGLES);
 
@@ -236,12 +265,10 @@ namespace JGL
                 glVertex2f(x2 + w, y2);
 
                 glEnd();
-
-                x += (g->advance.x >> 6) * scale;
-                y += (g->advance.y >> 6) * scale;
             }
-            for (unsigned int& texture : textures)
-                glDeleteTextures(1, &texture);
+
+            //for (unsigned int& texture : textures)
+            //glDeleteTextures(1, &texture);
 
             glDisable(GL_TEXTURE_2D);
             glDisable(GL_BLEND);
@@ -250,7 +277,6 @@ namespace JGL
         }
     }
 
-
     namespace J3D
     {
         void DrawLine3D(const Color3& color, const Vector3& A, const Vector3& B, float thickness)