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145 lines
3.4 KiB
C++
145 lines
3.4 KiB
C++
//*******************************************************************
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//glfont2.h -- Header for glfont2.cpp
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//Copyright (c) 1998-2002 Brad Fish
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//See glfont.html for terms of use
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//May 14, 2002
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//*******************************************************************
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#ifndef GLFONT2_H
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#define GLFONT2_H
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#include <assert.h>
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//*******************************************************************
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//GLFont Interface
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//*******************************************************************
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//glFont namespace
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namespace glfont
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{
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class GLFont;
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}
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//glFont class
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class glfont::GLFont
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{
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private:
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//glFont character structure
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typedef struct
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{
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float dx, dy;
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float tx1, ty1;
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float tx2, ty2;
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} GLFontChar;
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//glFont header structure
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struct
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{
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unsigned int tex;
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unsigned int tex_width, tex_height;
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unsigned int start_char, end_char;
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GLFontChar *chars;
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} header;
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public:
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//Constructor
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GLFont ();
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//Destructor
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~GLFont ();
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public:
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//Creates the glFont
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bool Create (const char *file_name, int tex, bool loadTexture=true);
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bool Create (const std::string &file_name, int tex, bool loadTexture=true);
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//Destroys the glFont
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void Destroy (void);
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//Texture size retrieval methods
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void GetTexSize (std::pair<int, int> *size) const;
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int GetTexWidth (void) const;
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int GetTexHeight (void) const;
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//Character interval retrieval methods
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void GetCharInterval (std::pair<int, int> *interval) const;
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int GetStartChar (void) const;
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int GetEndChar (void) const;
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//Character size retrieval methods
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void GetCharSize (unsigned char c, std::pair<int, int> *size) const;
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int GetCharWidth (unsigned char c) const;
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int GetCharHeight (unsigned char c) const;
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void GetStringSize (const std::string &text, std::pair<int, int> *size) const;
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//Begins text output with this font
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void Begin (void) const;
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//Template function to output a scaled, colored std::basic_string
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template<class T> void DrawString (
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const std::basic_string<T> &text, float scalar, float x,
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float y, const float *top_color, const float *bottom_color, float alpha, float lastAlpha) const
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{
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unsigned int i;
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GLFontChar *glfont_char;
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float width, height;
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//Begin rendering quads
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glBegin(GL_QUADS);
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unsigned int sz = text.size();
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float a = 0;
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//Loop through characters
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for (i = 0; i < sz; i++)
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{
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//Make sure character is in range
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unsigned int c = (unsigned char)text[i];
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if (c < header.start_char || c > header.end_char)
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continue;
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//Get pointer to glFont character
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glfont_char = &header.chars[c - header.start_char];
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//Get width and height
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width = (glfont_char->dx * header.tex_width) * scalar;
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height = (glfont_char->dy * header.tex_height) * scalar;
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if (i == (sz-1))
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a = alpha*lastAlpha;
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else
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a = alpha;
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//Specify colors, vertices, and texture coordinates
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glColor4f(top_color[0], top_color[1], top_color[2], a);
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glTexCoord2f(glfont_char->tx1, glfont_char->ty1);
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glVertex3f(x, y, 0.0F);
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glTexCoord2f(glfont_char->tx2, glfont_char->ty1);
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glVertex3f(x + width, y, 0.0F);
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glColor4f(bottom_color[0], bottom_color[1], bottom_color[2], a);
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glTexCoord2f(glfont_char->tx2, glfont_char->ty2);
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glVertex3f(x + width, y + height, 0.0F);
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glTexCoord2f(glfont_char->tx1, glfont_char->ty2);
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glVertex3f(x, y + height, 0.0F);
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//Move to next character
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x += width;
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}
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//Stop rendering quads
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glEnd();
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}
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};
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//*******************************************************************
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#endif
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//End of file
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