forked from 0ad/0ad
81 lines
1.7 KiB
C
Executable File
81 lines
1.7 KiB
C
Executable File
// OpenGL texture font
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef __FONT_H__
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#define __FONT_H__
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#include "types.h"
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#include "res.h"
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// load and return a handle to the font defined in <fn>
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extern Handle font_load(const char* fn);
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// use the font referenced by h for all subsequent glprintf() calls
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extern int font_bind(Handle h);
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// output text at current OpenGL modelview pos.
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// assumes ortho projection with texturing, alpha test, and blending enabled.
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// must bind a font before calling!
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extern void glprintf(const char* fmt, ...);
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#endif // #ifndef __FONT_H__
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/*
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EXAMPLE:
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#include "font.h"
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u32 h;
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void init()
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{
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0, g_xres, 0, g_yres, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_BLEND);
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glBlendFunc(GL_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_ALPHA_TEST);
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glAlphaFunc(GL_GREATER, 0.5);
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h = font_load("font.fnt");
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if(!h)
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abort();
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}
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void render()
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{
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font_bind(h);
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glprintf("string");
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}
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// FONT FILE FORMAT:
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%s // texture file name
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%d %d // width/height of glyphs in the texture
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%d [...] %d // advance width for chars 32..127
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*/
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