[3478] | 1 | /* |
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| 2 | orxonox - the future of 3D-vertical-scrollers |
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| 3 | |
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| 4 | Copyright (C) 2004 orx |
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| 5 | |
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| 6 | This program is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | ### File Specific: |
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| 12 | main-programmer: Benjamin Grauer |
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| 13 | co-programmer: ... |
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| 14 | |
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| 15 | *** |
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| 16 | * This file is extended to the needs of the orxonox-project. * |
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| 17 | * the Copyright of the original file is below this copyright * |
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| 18 | * *** |
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| 19 | |
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[3691] | 20 | for some fonts and licenses visit: =http://www.dafont.com/en/font.php= |
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[3478] | 21 | */ |
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| 22 | |
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| 23 | /* |
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| 24 | glfont: An example of using the SDL_ttf library with OpenGL. |
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| 25 | Copyright (C) 1997-2004 Sam Lantinga |
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| 26 | |
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| 27 | This library is free software; you can redistribute it and/or |
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| 28 | modify it under the terms of the GNU Library General Public |
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| 29 | License as published by the Free Software Foundation; either |
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| 30 | version 2 of the License, or (at your option) any later version. |
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| 31 | |
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| 32 | This library is distributed in the hope that it will be useful, |
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| 33 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 34 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 35 | Library General Public License for more details. |
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| 36 | |
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| 37 | You should have received a copy of the GNU Library General Public |
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| 38 | License along with this library; if not, write to the Free |
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| 39 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 40 | |
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| 41 | The SDL_GL_* functions in this file are available in the public domain. |
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| 42 | |
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| 43 | Sam Lantinga |
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| 44 | slouken@libsdl.org |
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| 45 | */ |
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| 46 | |
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| 47 | #include "glfont.h" |
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| 48 | |
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| 49 | #include <stdlib.h> |
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| 50 | #include <stdio.h> |
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| 51 | #include <string.h> |
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| 52 | |
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[3682] | 53 | #include "debug.h" |
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[3478] | 54 | |
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[3693] | 55 | GLFont::GLFont(const char* fontFile, unsigned int fontSize) |
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[3478] | 56 | { |
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[3693] | 57 | this->init(fontFile, fontSize); |
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[3478] | 58 | } |
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[3692] | 59 | |
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[3693] | 60 | GLFont::~GLFont(void) |
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[3478] | 61 | { |
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[3691] | 62 | if (this->font) |
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| 63 | TTF_CloseFont(this->font); |
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[3478] | 64 | } |
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| 65 | |
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[3692] | 66 | /** |
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| 67 | \function to enable TTF_Fonts |
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| 68 | */ |
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[3691] | 69 | void GLFont::enableFonts(void) |
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| 70 | { |
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| 71 | if (!GLFont::ttfInitialized) |
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| 72 | { |
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| 73 | if(TTF_Init()==-1) { |
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| 74 | PRINTF(1)("TTF_Init: %s\n", TTF_GetError()); |
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| 75 | exit(2); |
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| 76 | } |
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| 77 | GLFont::checkVersion(); |
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| 78 | GLFont::ttfInitialized = true; |
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| 79 | } |
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| 80 | else |
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| 81 | PRINTF(4)("Fonts already initialized\n"); |
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| 82 | |
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| 83 | } |
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[3692] | 84 | |
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| 85 | /** |
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| 86 | \brief function to disable TTF_fonts |
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| 87 | */ |
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[3691] | 88 | void GLFont::disableFonts(void) |
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| 89 | { |
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| 90 | if (GLFont::ttfInitialized) |
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| 91 | { |
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| 92 | TTF_Quit(); |
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| 93 | GLFont::ttfInitialized = false; |
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| 94 | } |
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| 95 | else |
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| 96 | PRINTF(4)("Fonts were not initialized.\n"); |
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| 97 | } |
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| 98 | |
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[3694] | 99 | //! A simple variable for checking if ttf was initialized |
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[3691] | 100 | bool GLFont::ttfInitialized = false; |
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| 101 | |
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[3694] | 102 | /** |
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| 103 | \brief initializes a new Font |
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| 104 | \param fontFile The file to load a Font from |
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| 105 | \param fontSize the Size in pixels of the Font |
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| 106 | */ |
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[3693] | 107 | bool GLFont::init(const char* fontFile, unsigned int fontSize) |
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[3478] | 108 | { |
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[3693] | 109 | if (!GLFont::ttfInitialized) |
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| 110 | GLFont::enableFonts(); |
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| 111 | |
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[3478] | 112 | // setting default values. |
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[3691] | 113 | this->font = NULL; |
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| 114 | this->fontFile = NULL; |
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[3693] | 115 | |
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[3691] | 116 | |
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[3693] | 117 | this->setSize(fontSize); |
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| 118 | |
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[3691] | 119 | this->renderStyle = TTF_STYLE_NORMAL; |
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[3478] | 120 | |
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[3693] | 121 | this->setFont(fontFile); |
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[3478] | 122 | |
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[3693] | 123 | this->setText( FONT_DEFAULT_TEXT); |
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| 124 | |
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[3691] | 125 | } |
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| 126 | |
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[3694] | 127 | /** |
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| 128 | \brief sets The Font. |
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| 129 | \param fontFile The file containing the font. |
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| 130 | \returns true if loaded, false if something went wrong, or if a font was loaded before. |
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| 131 | */ |
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[3691] | 132 | bool GLFont::setFont(const char* fontFile) |
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| 133 | { |
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| 134 | if (!this->fontFile) |
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[3478] | 135 | { |
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[3691] | 136 | this->fontFile = new char[strlen(fontFile)+1]; |
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| 137 | strcpy(this->fontFile, fontFile); |
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| 138 | |
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| 139 | this->font = TTF_OpenFont(this->fontFile, this->fontSize); |
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| 140 | if(!this->font) |
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| 141 | { |
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| 142 | PRINTF(1)("TTF_OpenFont: %s\n", TTF_GetError()); |
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[3694] | 143 | return false; |
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[3691] | 144 | } |
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[3694] | 145 | return true; |
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[3478] | 146 | } |
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[3691] | 147 | else |
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[3694] | 148 | { |
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| 149 | PRINTF(2)("Font already initialized, unable to change it now.\n"); |
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| 150 | return false; |
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| 151 | } |
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[3478] | 152 | } |
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| 153 | |
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[3694] | 154 | /** |
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| 155 | \brief Sets a new Text to the font |
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| 156 | \param text the new text to set |
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| 157 | */ |
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[3478] | 158 | void GLFont::setText(const char* text) |
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| 159 | { |
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[3691] | 160 | this->text = new char[strlen(text)+1]; |
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| 161 | strcpy(this->text, text); |
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[3693] | 162 | |
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| 163 | this->createTexture(); |
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[3478] | 164 | } |
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| 165 | |
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[3691] | 166 | /** |
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| 167 | \brief sets a specific renderStyle |
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| 168 | \param renderStyle the Style to render: a char-array containing: |
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| 169 | i: italic, b: bold, u, underline |
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| 170 | */ |
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| 171 | void GLFont::setStyle(char* renderStyle) |
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[3478] | 172 | { |
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[3691] | 173 | this->renderStyle = TTF_STYLE_NORMAL; |
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[3478] | 174 | |
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[3691] | 175 | for (int i = 0; i < strlen(renderStyle); i++) |
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| 176 | if (strncmp(renderStyle+i, "b", 1) == 0) |
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[3478] | 177 | this->renderStyle |= TTF_STYLE_BOLD; |
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[3691] | 178 | else if (strncmp(renderStyle+i, "i", 1) == 0) |
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[3478] | 179 | this->renderStyle |= TTF_STYLE_ITALIC; |
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[3691] | 180 | else if (strncmp(renderStyle+i, "u", 1) == 0) |
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[3478] | 181 | this->renderStyle |= TTF_STYLE_UNDERLINE; |
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| 182 | |
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[3691] | 183 | if (this->font) |
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| 184 | TTF_SetFontStyle(this->font, this->renderStyle); |
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| 185 | else |
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| 186 | PRINTF(2)("Font was not initialized, please do so before setting the Font-Style.\n"); |
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| 187 | } |
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[3478] | 188 | |
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[3694] | 189 | /** |
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| 190 | \brief Sets a new Size to the font |
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| 191 | \param fontSize The new Size in pixels. |
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| 192 | */ |
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[3692] | 193 | void GLFont::setSize(unsigned int fontSize) |
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[3478] | 194 | { |
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[3692] | 195 | this->fontSize = fontSize; |
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| 196 | } |
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[3478] | 197 | |
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[3694] | 198 | /** |
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| 199 | \brief sets a new color to the font |
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| 200 | \param r Red |
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| 201 | \param g Green |
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| 202 | \param b Blue |
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| 203 | */ |
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[3692] | 204 | void GLFont::setColor(Uint8 r, Uint8 g, Uint8 b) |
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| 205 | { |
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| 206 | this->color.r = r; |
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| 207 | this->color.g = g; |
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| 208 | this->color.b = b; |
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[3478] | 209 | } |
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[3691] | 210 | |
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[3694] | 211 | /** |
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| 212 | \brief sets a Position. |
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| 213 | \param x the x-position in pixels from the left border |
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| 214 | \param y the y-position in pixels from the top border |
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| 215 | */ |
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[3693] | 216 | void GLFont::setPosition(int x, int y) |
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| 217 | { |
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| 218 | this->positionX = x; |
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| 219 | this->positionY = y; |
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| 220 | } |
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[3692] | 221 | |
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[3694] | 222 | /** |
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| 223 | \brief draws the Font |
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| 224 | \todo FIX this is to slow/static |
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| 225 | */ |
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[3693] | 226 | void GLFont::draw(void) |
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| 227 | { |
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| 228 | this->enter2DMode(); |
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| 229 | glBindTexture(GL_TEXTURE_2D, texture); |
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| 230 | glEnable(GL_TEXTURE_2D); |
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| 231 | glBegin(GL_QUADS); |
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| 232 | glTexCoord2f(0, 0); glVertex2i(20, 20 ); |
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[3694] | 233 | glTexCoord2f(1, 0); glVertex2i(20+this->textPosSize.w, 20 ); |
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| 234 | glTexCoord2f(1, 1); glVertex2i(20+this->textPosSize.w, 20+this->textPosSize.h); |
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| 235 | glTexCoord2f(0, 1); glVertex2i(20, 20+this->textPosSize.h); |
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[3693] | 236 | glEnd(); |
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| 237 | this->leave2DMode(); |
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| 238 | |
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| 239 | } |
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| 240 | |
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| 241 | |
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[3694] | 242 | /** |
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| 243 | \brief creates a texture out of the given parameters |
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| 244 | */ |
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[3692] | 245 | void GLFont::createTexture(void) |
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| 246 | { |
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| 247 | GLfloat texcoord[4]; |
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| 248 | SDL_Surface* tmpSurf = TTF_RenderText_Blended(this->font, this->text, this->color); |
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[3693] | 249 | if (tmpSurf) |
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| 250 | this->texture = loadTexture(tmpSurf, texcoord); |
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[3694] | 251 | |
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| 252 | this->textPosSize.w = tmpSurf->w; |
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| 253 | this->textPosSize.h = tmpSurf->h; |
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| 254 | SDL_FreeSurface(tmpSurf); |
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[3692] | 255 | } |
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| 256 | |
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| 257 | |
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[3691] | 258 | /** |
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| 259 | \returns the maximum height of the Font, if the font was initialized, 0 otherwise |
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| 260 | */ |
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| 261 | int GLFont::getMaxHeight(void) |
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| 262 | { |
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| 263 | if (this->font) |
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| 264 | return TTF_FontHeight(this->font); |
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| 265 | else |
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| 266 | return 0; |
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| 267 | } |
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| 268 | |
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| 269 | /** |
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| 270 | \returns the maximum ascent of the Font, if the font was initialized, 0 otherwise |
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| 271 | |
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| 272 | the ascent is the pixels of the font above the baseline |
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| 273 | */ |
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| 274 | int GLFont::getMaxAscent(void) |
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| 275 | { |
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| 276 | if (this->font) |
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| 277 | return TTF_FontAscent(this->font); |
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| 278 | else |
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| 279 | return 0; |
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| 280 | } |
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| 281 | |
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| 282 | /** |
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| 283 | \returns the maximum descent of the Font, if the font was initialized, 0 otherwise |
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| 284 | |
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| 285 | the descent is the pixels of the font below the baseline |
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| 286 | */ |
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| 287 | int GLFont::getMaxDescent(void) |
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| 288 | { |
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| 289 | if (this->font) |
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| 290 | return TTF_FontDescent(this->font); |
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| 291 | else |
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| 292 | return 0; |
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| 293 | } |
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| 294 | |
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| 295 | /** |
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| 296 | \param character The character to get info about. |
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| 297 | \returns a Glyph struct of a character. |
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| 298 | |
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| 299 | This only works for horizontal fonts. see |
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| 300 | http://freetype.sourceforge.net/freetype2/docs/tutorial/step2.html |
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| 301 | for more info about vertical Fonts |
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| 302 | */ |
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[3694] | 303 | Glyph GLFont::getGlyphMetrics(Uint16 character) |
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[3691] | 304 | { |
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[3694] | 305 | Glyph rg; |
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[3691] | 306 | rg.character = character; |
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| 307 | TTF_GlyphMetrics(this->font, rg.character, |
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| 308 | &rg.minX, &rg.maxX, |
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| 309 | &rg.minY, &rg.maxY, |
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| 310 | &rg.advance); |
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| 311 | rg.height = rg.maxY - rg.minY; |
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| 312 | rg.width = rg.maxX - rg.minX; |
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| 313 | rg.bearingX = (rg.advance - rg.width) / 2; |
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| 314 | rg.bearingY = rg.maxY; |
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| 315 | return rg; |
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| 316 | } |
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| 317 | |
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[3694] | 318 | /** |
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| 319 | \brief entering 2D Mode |
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| 320 | |
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| 321 | this is a GL-Projection-mode, that is orthogonal, for placing the font in fron of everything else |
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| 322 | */ |
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| 323 | void GLFont::enter2DMode(void) |
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[3478] | 324 | { |
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[3682] | 325 | SDL_Surface *screen = SDL_GetVideoSurface(); |
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| 326 | |
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| 327 | /* Note, there may be other things you need to change, |
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| 328 | depending on how you have your OpenGL state set up. |
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| 329 | */ |
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| 330 | glPushAttrib(GL_ENABLE_BIT); |
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| 331 | glDisable(GL_DEPTH_TEST); |
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| 332 | glDisable(GL_CULL_FACE); |
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| 333 | glEnable(GL_TEXTURE_2D); |
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| 334 | |
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| 335 | /* This allows alpha blending of 2D textures with the scene */ |
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| 336 | glEnable(GL_BLEND); |
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| 337 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
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| 338 | |
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| 339 | glViewport(0, 0, screen->w, screen->h); |
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| 340 | |
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| 341 | glMatrixMode(GL_PROJECTION); |
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| 342 | glPushMatrix(); |
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| 343 | glLoadIdentity(); |
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| 344 | |
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| 345 | glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0); |
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| 346 | |
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| 347 | glMatrixMode(GL_MODELVIEW); |
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| 348 | glPushMatrix(); |
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| 349 | glLoadIdentity(); |
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| 350 | |
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| 351 | glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
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[3478] | 352 | } |
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| 353 | |
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[3694] | 354 | /** |
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| 355 | \brief leaves the 2DMode again also \see GLFont::enter2DMode(void) |
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| 356 | */ |
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| 357 | void GLFont::leave2DMode(void) |
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[3478] | 358 | { |
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[3682] | 359 | glMatrixMode(GL_MODELVIEW); |
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| 360 | glPopMatrix(); |
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[3478] | 361 | |
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[3682] | 362 | glMatrixMode(GL_PROJECTION); |
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| 363 | glPopMatrix(); |
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| 364 | |
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| 365 | glPopAttrib(); |
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[3478] | 366 | } |
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| 367 | |
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[3694] | 368 | /** |
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| 369 | \brief Loads a Font from an SDL_surface into a texture. |
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| 370 | \param surface The surface to make the texture of |
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| 371 | \param texcoord The texture coordinates of the 4 corners of the texture |
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| 372 | \returns the ID of the texture |
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| 373 | */ |
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[3682] | 374 | GLuint GLFont::loadTexture(SDL_Surface *surface, GLfloat *texcoord) |
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[3478] | 375 | { |
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[3682] | 376 | GLuint texture; |
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| 377 | int w, h; |
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| 378 | SDL_Surface *image; |
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| 379 | SDL_Rect area; |
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| 380 | Uint32 saved_flags; |
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| 381 | Uint8 saved_alpha; |
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| 382 | |
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| 383 | /* Use the surface width and height expanded to powers of 2 */ |
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[3691] | 384 | w = powerOfTwo(surface->w); |
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| 385 | h = powerOfTwo(surface->h); |
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[3682] | 386 | texcoord[0] = 0.0f; /* Min X */ |
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| 387 | texcoord[1] = 0.0f; /* Min Y */ |
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| 388 | texcoord[2] = (GLfloat)surface->w / w; /* Max X */ |
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| 389 | texcoord[3] = (GLfloat)surface->h / h; /* Max Y */ |
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| 390 | |
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| 391 | image = SDL_CreateRGBSurface( |
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| 392 | SDL_SWSURFACE, |
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| 393 | w, h, |
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| 394 | 32, |
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| 395 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ |
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| 396 | 0x000000FF, |
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| 397 | 0x0000FF00, |
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| 398 | 0x00FF0000, |
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| 399 | 0xFF000000 |
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| 400 | #else |
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| 401 | 0xFF000000, |
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| 402 | 0x00FF0000, |
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| 403 | 0x0000FF00, |
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| 404 | 0x000000FF |
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| 405 | #endif |
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| 406 | ); |
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| 407 | if ( image == NULL ) { |
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| 408 | return 0; |
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| 409 | } |
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| 410 | |
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| 411 | /* Save the alpha blending attributes */ |
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| 412 | saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK); |
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| 413 | saved_alpha = surface->format->alpha; |
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| 414 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
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| 415 | SDL_SetAlpha(surface, 0, 0); |
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| 416 | } |
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| 417 | |
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| 418 | /* Copy the surface into the GL texture image */ |
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| 419 | area.x = 0; |
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| 420 | area.y = 0; |
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| 421 | area.w = surface->w; |
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| 422 | area.h = surface->h; |
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| 423 | SDL_BlitSurface(surface, &area, image, &area); |
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| 424 | |
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| 425 | /* Restore the alpha blending attributes */ |
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| 426 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
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| 427 | SDL_SetAlpha(surface, saved_flags, saved_alpha); |
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| 428 | } |
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| 429 | |
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| 430 | /* Create an OpenGL texture for the image */ |
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| 431 | glGenTextures(1, &texture); |
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| 432 | glBindTexture(GL_TEXTURE_2D, texture); |
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| 433 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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| 434 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 435 | glTexImage2D(GL_TEXTURE_2D, |
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| 436 | 0, |
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| 437 | GL_RGBA, |
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| 438 | w, h, |
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| 439 | 0, |
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| 440 | GL_RGBA, |
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| 441 | GL_UNSIGNED_BYTE, |
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| 442 | image->pixels); |
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| 443 | SDL_FreeSurface(image); /* No longer needed */ |
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| 444 | |
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| 445 | return texture; |
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[3478] | 446 | } |
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| 447 | |
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[3682] | 448 | |
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[3691] | 449 | bool GLFont::checkVersion(void) |
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| 450 | { |
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| 451 | SDL_version compile_version; |
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| 452 | SDL_version link_version; |
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| 453 | TTF_VERSION(&compile_version); |
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| 454 | link_version = *TTF_Linked_Version(); |
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| 455 | |
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| 456 | if (compile_version.major == link_version.major && |
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| 457 | compile_version.minor == link_version.minor && |
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| 458 | compile_version.patch == link_version.patch) |
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| 459 | { |
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| 460 | return true; |
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| 461 | } |
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| 462 | else |
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| 463 | { |
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| 464 | PRINTF(2)("compiled with SDL_ttf version: %d.%d.%d\n", |
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| 465 | compile_version.major, |
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| 466 | compile_version.minor, |
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| 467 | compile_version.patch); |
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| 468 | |
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| 469 | PRINTF(2)("running with SDL_ttf version: %d.%d.%d\n", |
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| 470 | link_version.major, |
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| 471 | link_version.minor, |
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| 472 | link_version.patch); |
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| 473 | return false; |
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| 474 | } |
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| 475 | } |
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| 476 | |
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| 477 | |
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| 478 | |
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[3694] | 479 | /** |
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| 480 | \brief Quick utility function for texture creation |
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| 481 | \param input an integer |
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| 482 | \returns the next bigger 2^n-integer than input |
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| 483 | */ |
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[3691] | 484 | int GLFont::powerOfTwo(int input) |
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[3478] | 485 | { |
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[3682] | 486 | int value = 1; |
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| 487 | |
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| 488 | while ( value < input ) { |
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| 489 | value <<= 1; |
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| 490 | } |
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| 491 | return value; |
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[3478] | 492 | } |
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[3691] | 493 | |
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| 494 | |
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[3694] | 495 | /** |
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| 496 | \brief a simple function to get some interesting information about this class |
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| 497 | */ |
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[3691] | 498 | void GLFont::debug(void) |
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| 499 | { |
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| 500 | |
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| 501 | // print the loaded font's style |
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| 502 | int style; |
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| 503 | style=TTF_GetFontStyle(this->font); |
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| 504 | PRINTF(0)("The font style is:"); |
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| 505 | if(style==TTF_STYLE_NORMAL) |
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| 506 | PRINTF(0)(" normal"); |
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| 507 | else { |
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| 508 | if(style&TTF_STYLE_BOLD) |
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| 509 | PRINTF(0)(" bold"); |
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| 510 | if(style&TTF_STYLE_ITALIC) |
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| 511 | PRINTF(0)(" italic"); |
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| 512 | if(style&TTF_STYLE_UNDERLINE) |
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| 513 | PRINTF(0)(" underline"); |
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| 514 | } |
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| 515 | PRINTF(0)("\n"); |
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| 516 | |
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| 517 | |
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| 518 | } |
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