v01

thirdparty/Pangolin/include/pangolin/gl/glfont.h

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+/* This file is part of the Pangolin Project.
+ * http://github.com/stevenlovegrove/Pangolin
+ *
+ * Copyright (c) 2015 Steven Lovegrove
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <pangolin/gl/gltext.h>
+
+#include <cstdio>
+#include <cstdarg>
+
+namespace pangolin {
+
+class PANGOLIN_EXPORT GlFont
+{
+public:
+    // Singleton instance if requested.
+    static GlFont& I();
+
+    // Load GL Font data. Delay uploading as texture until first use.
+    GlFont(const unsigned char* ttf_buffer, float pixel_height, int tex_w=512, int tex_h=512);
+    GlFont(const std::string& filename, float pixel_height, int tex_w=512, int tex_h=512);
+
+    virtual ~GlFont();
+
+    // Generate renderable GlText object from this font.
+    GlText Text( const char* fmt, ... );
+
+    GlText Text( const std::string& str );
+
+    inline float Height() const {
+        return font_height_px;
+    }
+    
+protected:
+    void InitialiseFont(const unsigned char* ttf_buffer, float pixel_height, int tex_w, int tex_h);
+
+    // This can only be called once GL context is initialised
+    void InitialiseGlTexture();
+
+    const static int FIRST_CHAR = 32;
+    const static int NUM_CHARS = 96;
+
+    float font_height_px;
+
+    int tex_w;
+    int tex_h;
+    unsigned char* font_bitmap;
+    GlTexture mTex;
+
+    GlChar chardata[NUM_CHARS];
+    GLfloat kern_table[NUM_CHARS*NUM_CHARS];
+};
+
+}