Support for multiple fonts

include/JGL/JGL.h

@@ -3,16 +3,15 @@
 //
 #pragma once
 
-#include <J3ML/LinearAlgebra.h>
-#include <J3ML/LinearAlgebra/Vector2.h>
-#include <J3ML/LinearAlgebra/Vector3.h>
 #include <string>
 #include <iostream>
 #include <JGL/Color3.h>
+#include <J3ML/LinearAlgebra.h>
+#include <J3ML/LinearAlgebra/Vector2.h>
+#include <J3ML/LinearAlgebra/Vector3.h>
 #include <J3ML/Geometry/Sphere.h>
 #include <J3ML/Geometry/Capsule.h>
 #include <J3ML/Geometry/TriangleMesh.h>
-
 // OpenGL Wrapper for rendering 2D graphics primitives in both a 2D and 3D context
 namespace JGL {
 
@@ -50,7 +49,8 @@ namespace JGL {
     };
 
     bool InitTextEngine();
-
+    int LoadFont(const std::string& font_path);
+    void UnloadFont(int font_index);
     // TODO: implement correct coloring
 
     namespace J2D {
@@ -68,7 +68,7 @@ namespace JGL {
         void FillTexturedPolygon2D();
         void DrawSprite2D();
         void DrawPartialSprite2D();
-        void DrawString2D(const Color3& color, std::string text, float x, float y, float scale, u32 size = 16);
+        void DrawString2D(const Color3& color, std::string text, float x, float y, float scale, u32 size, unsigned int font_index);
         void FillRect2D(const Color3 &color, const Vector2 &pos, const Vector2 &size);
         void OutlineRect2D       ( const Color3& color, const Vector2& pos, const Vector2& size, float thickness = 1);
         void FillRoundedRect2D   (const Color3& color, const Vector2& pos, const Vector2& size, float radius);
@@ -87,7 +87,7 @@ namespace JGL {
         void WireframeCapsule3D(const Color3& color, const Capsule& cap, float thickness = 1);
         void FillTriangleMesh3D(const Color3& color, const TriangleMesh& mesh);
         void WireframeTriangleMesh3D(const Color3& color, const TriangleMesh& mesh, float thickness = 1);
-        void DrawString3D(const Color3& color, const std::string& text, const Vector3& pos, float scale, u32 size = 12);
+        void DrawString3D(const Color3& color, const std::string& text, const Vector3& pos, float scale, u32 size, unsigned int font_index);
 
         void DrawMatrixGizmo     (const Matrix3x3&, const Vector3&);
         void DrawMatrixGizmo     (const Matrix4x4&);

main.cpp

@@ -26,6 +26,9 @@ struct point {
     GLfloat t;
 };
 
+int FreeSans;
+int Jupiteroid;
+
 class JGLDemoWindow : public ReWindow::RWindow
 {
 public:
@@ -53,12 +56,13 @@ public:
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
         glEnable(GL_TEXTURE_2D);
 
-        JGL::InitTextEngine();
+         JGL::InitTextEngine();
+         FreeSans = JGL::LoadFont("assets/fonts/FreeSans.ttf");
+         Jupiteroid = JGL::LoadFont("assets/fonts/Jupiteroid.ttf");
     }
 
 
-    void display()
+    void display() {
-    {
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
         glMatrixMode(GL_PROJECTION);
@@ -76,15 +80,13 @@ public:
                         {105, 100}
                 };
         JGL::J2D::FillTriangle2D(JGL::Colors::Yellow, tri);
-
-
-        JGL::J3D::DrawString3D(JGL::Colors::Red, "JGL Sample Text", {1, -120, 0.5f}, 2.f);
-        JGL::J2D::DrawString2D(JGL::Colors::Green, "William J. Tomasine II ", 0.f, -120.f, 1.f);
-
         JGL::J2D::DrawLine2D(JGL::Colors::Greens::DarkGreen, {10, 10}, {200, 300});
         JGL::J3D::DrawLine3D(JGL::Colors::Red, {0,0,0}, {1,0,0});
         JGL::J3D::DrawLine3D(JGL::Colors::Red, {0,0,0}, {1,0,0});
 
+        JGL::J3D::DrawString3D(JGL::Colors::Red, "JGL Sample Text", {1, -32, 0.5f}, 1.f, 32, FreeSans);
+        JGL::J2D::DrawString2D(JGL::Colors::Green, "Jupiteroid Font", 0.f, -48.f, 1.f, 16, Jupiteroid);
+
         //glFlush();
     }
 

src/JGL.cpp

@@ -6,41 +6,59 @@
 #include <glad/glad.h>
 #include <JGL/JGL.h>
 #include <JGL/Color3.h>
-
 #if __linux__
     #include <freetype2/ft2build.h>
     #include FT_FREETYPE_H
 #endif
-
 #if _WIN32
     #include <ft2build.h>
     #include FT_FREETYPE_H
 #endif
 
 GLuint program;
-
 namespace JGL
 {
-    FT_Face face;
     FT_Library ft;
 
+    struct Font {
+        int index = 0;
+        FT_Face face;
+    };
+
+    std::vector<Font> faces;
+
     using namespace J3ML;
-
     bool InitTextEngine() {
-        constexpr u32 default_font_size = 16;
         if (FT_Init_FreeType(&ft))
-        {
+            return true;
-            std::cout << "Error::FREETYPE: " << std::endl;
+        return false;
-            return false;
+    }
-        }
 
-        if (FT_New_Face(ft, "assets/fonts/FreeSans.ttf", 0, &face))
+    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;
-            return false;
+            return -1;
         }
 
-        return true;
+        unsigned int newIndex = 0;
+            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;
+    }
+
+    void UnloadFont(int font_index) {
+        for (int i = 0; i < faces.size(); i++)
+            if (faces[i].index == font_index)
+                FT_Done_Face(faces[i].face),
+                faces.erase(faces.begin() + i);
     }
 
     namespace J2D
@@ -152,23 +170,32 @@ namespace JGL
             glEnd();
         }
 
-        void DrawString2D(const Color3& color, std::string text, float x, float y, float scale, u32 size) {
+        void DrawString2D(const Color3& color, std::string text, float x, float y, float scale, u32 size, unsigned int font_index) {
             glUseProgram(0); // Fixed-function pipeline.
 
+            Font font{};
+            for (const auto& f : faces)
+                if (f.index == font_index)
+                    font = f;
+            if (font.face == NULL) {
+                std::cout << "null font" << std::endl;
+                return;
+            }
+
             GLfloat currentColor[4];
             glGetFloatv(GL_CURRENT_COLOR, currentColor);
 
             glColor3f(color.r/255.f, color.g/255.f, color.b/255.f);
 
-            FT_Set_Pixel_Sizes(face, 0, size);
+            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(face, text.c_str()[i], FT_LOAD_RENDER))
+                if (FT_Load_Char(font.face, text.c_str()[i], FT_LOAD_RENDER))
                     continue;
 
-                FT_GlyphSlot g = face->glyph;
+                FT_GlyphSlot g = font.face->glyph;
                 glEnable(GL_BLEND);
                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                 glActiveTexture(GL_TEXTURE0);
@@ -236,7 +263,7 @@ namespace JGL
             glEnd();
         }
 
-        void DrawString3D(const Color3& color, const std::string& text, const Vector3& pos, float scale, u32 size)
+        void DrawString3D(const Color3& color, const std::string& text, const Vector3& pos, float scale, u32 size, unsigned int font_index)
         {
             float x = pos.x;
             float y = pos.y;
@@ -247,15 +274,25 @@ namespace JGL
             glUseProgram(0); // Fixed-function pipeline.
             glColor4f(color.r, color.g, color.b, 1.0f);
 
-            FT_Set_Pixel_Sizes(face, 0, size);
+            Font font;
+            for (auto& f : faces)
+                if (f.index == font_index)
+                    font = f;
+            if (font.face == NULL) {
+                std::cout << "null font" << std::endl;
+                return;
+            }
+
+
+            FT_Set_Pixel_Sizes(font.face, 0, size);
 
             //for (c = text.c_str(); *c; c++)
             for (int i = 0; i < text.length(); i++)
             {
-                if (FT_Load_Char(face, text.c_str()[i], FT_LOAD_RENDER))
+                if (FT_Load_Char(font.face, text.c_str()[i], FT_LOAD_RENDER))
                     continue;
 
-                FT_GlyphSlot g = face->glyph;
+                FT_GlyphSlot g = font.face->glyph;
                 glEnable(GL_BLEND);
                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                 glActiveTexture(GL_TEXTURE0);