1 files changed, 65 insertions, 1 deletions
diff --git a/src/text.cpp b/src/text.cpp
index 2f5d3c3..2258774 100644
--- a/src/text.cpp
+++ b/src/text.cpp
@@ -1,9 +1,27 @@
 #include "text.hpp"
 
+#include <SDL2/SDL_opengl.h>
+
+struct FT_Info {
+	vec2 wh;
+	vec2 bl;
+	vec2 ad;
+	GLuint tex;
+
+	FT_Info(void)
+		: tex(0) {}
+};
+
+//FT_Library freetype;
+//std::map<std::string, FT_Face> fonts;
+//std::map<std::string, std::vector<FT_Info>> fontData;
+
 void TextSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
                            [[maybe_unused]] entityx::EventManager& events)
 {
-    // TODO load freetype
+    if (FT_Init_FreeType(&freetype) != 0) {
+        // TODO handle error
+    }
 }
     
 /**
@@ -16,3 +34,49 @@ void TextSystem::update([[maybe_unused]] entityx::EntityManager& entites,
     // TODO render each Text component's text
 }
 
+void TextSystem::loadFont(const std::string& name,
+                          const std::string& file,
+                          int size)
+{
+
+    if (fonts.find(name) == fonts.end()) {
+        FT_Face face;
+        if (FT_New_Face(freetype, file.c_str(), 0, &face)) {
+            // TODO handle this error
+        }
+        fonts.emplace(name, face);
+    }
+
+    auto& face = fonts[name];
+    FT_Set_Pixel_Sizes(face, 0, size);
+    fontData.try_emplace(name, 95);
+
+    char c = 32;
+    for (auto& d : fontData[name]) {
+        FT_Load_Char(face, c++, FT_LOAD_RENDER);
+
+        glGenTextures(1, &d.tex);
+        glBindTexture(GL_TEXTURE_2D, d.tex);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S , GL_CLAMP_TO_EDGE);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T , GL_CLAMP_TO_EDGE);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER , GL_LINEAR);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER , GL_LINEAR);
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+        // convert red-on-black to RGBA
+        auto& g = face->glyph;
+        std::vector<uint32_t> buf (g->bitmap.width * g->bitmap.rows, 0xFFFFFF);
+        for (auto j = buf.size(); j--;)
+            buf[j] |= g->bitmap.buffer[j] << 24;
+
+        d.wh.x = g->bitmap.width;
+        d.wh.y = g->bitmap.rows;
+        d.bl.x = g->bitmap_left;
+        d.bl.y = g->bitmap_top;
+        d.ad.x = g->advance.x >> 6;
+        d.ad.y = g->advance.y >> 6;
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, g->bitmap.width, g->bitmap.rows,
+            0, GL_RGBA, GL_UNSIGNED_BYTE, buf.data());
+    }
+}
+