1 | /* |
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2 | * libcaca ASCII-Art library |
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3 | * Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * This library is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the Do What The Fuck You Want To |
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8 | * Public License, Version 2, as published by Sam Hocevar. See |
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9 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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10 | */ |
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11 | |
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12 | /** \file driver_gl.c |
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13 | * \version \$Id: driver_gl.c 548 2006-03-08 09:28:41Z sam $ |
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14 | * \author Jean-Yves Lamoureux <jylam@lnxscene.org> |
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15 | * \brief OpenGL driver |
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16 | * |
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17 | * This file contains the libcaca OpenGL input and output driver |
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18 | */ |
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19 | |
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20 | #include "config.h" |
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21 | |
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22 | #if defined(USE_GL) |
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23 | |
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24 | #include <GL/gl.h> |
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25 | #include <GL/glut.h> |
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26 | #include <GL/freeglut_ext.h> |
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27 | |
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28 | #include <stdio.h> /* BUFSIZ */ |
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29 | #include <string.h> |
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30 | #include <stdlib.h> |
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31 | #if defined(HAVE_UNISTD_H) |
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32 | # include <unistd.h> |
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33 | #endif |
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34 | #include <stdarg.h> |
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35 | |
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36 | #include "caca.h" |
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37 | #include "caca_internals.h" |
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38 | #include "cucul.h" |
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39 | #include "cucul_internals.h" |
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40 | |
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41 | /* |
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42 | * Global variables |
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43 | */ |
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44 | |
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45 | /* Ok, I just suck. */ |
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46 | static GLbyte const gl_bgpal[][4] = |
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47 | { |
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48 | { 0x00, 0x00, 0x00, 0x7f }, |
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49 | { 0x00, 0x00, 0x3f, 0x7f }, |
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50 | { 0x00, 0x3f, 0x00, 0x7f }, |
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51 | { 0x00, 0x3f, 0x3f, 0x7f }, |
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52 | { 0x3f, 0x00, 0x00, 0x7f }, |
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53 | { 0x3f, 0x00, 0x3f, 0x7f }, |
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54 | { 0x3f, 0x3f, 0x00, 0x7f }, |
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55 | { 0x3f, 0x3f, 0x3f, 0x7f }, |
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56 | // + intensity |
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57 | { 0x00, 0x00, 0x00, 0x7f }, |
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58 | { 0x00, 0x00, 0x7f, 0x7f }, |
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59 | { 0x00, 0x7f, 0x00, 0x7f }, |
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60 | { 0x00, 0x7f, 0x7f, 0x7f }, |
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61 | { 0x7f, 0x00, 0x00, 0x7f }, |
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62 | { 0x7f, 0x00, 0x7f, 0x7f }, |
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63 | { 0x7f, 0x7f, 0x00, 0x7f }, |
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64 | { 0x7f, 0x7f, 0x7f, 0x7f } |
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65 | }; |
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66 | |
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67 | static caca_t *gl_kk; /* FIXME: we ought to get rid of this */ |
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68 | |
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69 | /* |
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70 | * Local functions |
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71 | */ |
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72 | static void gl_handle_keyboard(unsigned char, int, int); |
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73 | static void gl_handle_special_key(int, int, int); |
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74 | static void gl_handle_reshape(int, int); |
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75 | static void gl_handle_mouse(int, int, int, int); |
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76 | static void gl_handle_mouse_motion(int, int); |
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77 | |
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78 | static int gl_init_graphics(caca_t *kk) |
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79 | { |
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80 | char *empty_texture; |
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81 | char const *geometry; |
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82 | char *argv[2] = { "", NULL }; |
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83 | unsigned int width = 0, height = 0; |
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84 | int argc = 1; |
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85 | int i; |
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86 | |
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87 | gl_kk = kk; |
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88 | |
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89 | geometry = getenv("CACA_GEOMETRY"); |
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90 | if(geometry && *(geometry)) |
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91 | sscanf(geometry, "%ux%u", &width, &height); |
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92 | |
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93 | if(width && height) |
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94 | cucul_set_size(kk->qq, width, height); |
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95 | |
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96 | kk->gl.font_width = 9; |
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97 | kk->gl.font_height = 15; |
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98 | |
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99 | kk->gl.width = kk->qq->width * kk->gl.font_width; |
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100 | kk->gl.height = kk->qq->height * kk->gl.font_height; |
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101 | |
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102 | kk->gl.resized = 0; |
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103 | kk->gl.bit = 0; |
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104 | |
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105 | kk->gl.mouse_changed = kk->gl.mouse_clicked = 0; |
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106 | kk->gl.mouse_button = kk->gl.mouse_state = 0; |
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107 | |
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108 | kk->gl.key = 0; |
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109 | kk->gl.special_key = 0; |
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110 | |
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111 | kk->gl.sw = 9.0f / 16.0f; |
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112 | kk->gl.sh = 15.0f / 16.0f; |
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113 | |
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114 | glutInit(&argc, argv); |
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115 | |
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116 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); |
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117 | glutInitWindowSize(kk->gl.width, kk->gl.height); |
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118 | kk->gl.window = glutCreateWindow("caca for GL"); |
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119 | |
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120 | gluOrtho2D(0, kk->gl.width, kk->gl.height, 0); |
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121 | |
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122 | glDisable(GL_CULL_FACE); |
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123 | glDisable(GL_DEPTH_TEST); |
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124 | |
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125 | glutKeyboardFunc(gl_handle_keyboard); |
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126 | glutSpecialFunc(gl_handle_special_key); |
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127 | glutReshapeFunc(gl_handle_reshape); |
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128 | |
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129 | glutMouseFunc(gl_handle_mouse); |
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130 | glutMotionFunc(gl_handle_mouse_motion); |
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131 | glutPassiveMotionFunc(gl_handle_mouse_motion); |
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132 | |
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133 | glLoadIdentity(); |
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134 | |
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135 | glMatrixMode(GL_PROJECTION); |
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136 | glPushMatrix(); |
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137 | glLoadIdentity(); |
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138 | gluOrtho2D(0, kk->gl.width, kk->gl.height, 0); |
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139 | |
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140 | glMatrixMode(GL_MODELVIEW); |
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141 | |
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142 | glClear(GL_COLOR_BUFFER_BIT); |
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143 | |
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144 | empty_texture = malloc(16 * 16 * 4); |
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145 | if(empty_texture == NULL) |
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146 | return -1; |
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147 | |
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148 | memset(empty_texture, 0xff, 16 * 16 * 4); |
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149 | glEnable(GL_TEXTURE_2D); |
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150 | |
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151 | for(i = 0; i < 94; i++) |
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152 | { |
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153 | glGenTextures(1, (GLuint*)&kk->gl.id[i]); |
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154 | glBindTexture(GL_TEXTURE_2D, kk->gl.id[i]); |
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155 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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156 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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157 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, |
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158 | 16, 16, 0, GL_RGB, GL_UNSIGNED_BYTE, empty_texture); |
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159 | } |
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160 | |
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161 | for(i = 0; i < 94; i++) |
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162 | { |
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163 | glDisable(GL_TEXTURE_2D); |
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164 | glClear(GL_COLOR_BUFFER_BIT); |
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165 | |
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166 | glColor3f(1, 1, 1); |
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167 | glRasterPos2f(0, 15); |
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168 | glutBitmapCharacter(GLUT_BITMAP_9_BY_15, i + 32); |
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169 | |
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170 | glEnable(GL_TEXTURE_2D); |
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171 | glBindTexture(GL_TEXTURE_2D, kk->gl.id[i]); |
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172 | glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, |
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173 | 0, kk->gl.height - 16, 16, 16, 0); |
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174 | |
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175 | glutMainLoopEvent(); |
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176 | glutPostRedisplay(); |
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177 | } |
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178 | |
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179 | return 0; |
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180 | } |
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181 | |
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182 | static int gl_end_graphics(caca_t *kk) |
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183 | { |
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184 | glutDestroyWindow(kk->gl.window); |
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185 | return 0; |
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186 | } |
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187 | |
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188 | static int gl_set_window_title(caca_t *kk, char const *title) |
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189 | { |
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190 | glutSetWindowTitle(title); |
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191 | return 0; |
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192 | } |
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193 | |
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194 | static unsigned int gl_get_window_width(caca_t *kk) |
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195 | { |
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196 | return kk->gl.width; |
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197 | } |
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198 | |
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199 | static unsigned int gl_get_window_height(caca_t *kk) |
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200 | { |
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201 | return kk->gl.height; |
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202 | } |
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203 | |
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204 | static void gl_display(caca_t *kk) |
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205 | { |
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206 | unsigned int x, y, line; |
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207 | |
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208 | glClear(GL_COLOR_BUFFER_BIT); |
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209 | |
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210 | line = 0; |
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211 | for(y = 0; y < kk->gl.height; y += kk->gl.font_height) |
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212 | { |
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213 | uint8_t *attr = kk->qq->attr + line * kk->qq->width; |
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214 | |
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215 | for(x = 0; x < kk->gl.width; x += kk->gl.font_width) |
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216 | { |
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217 | glDisable(GL_TEXTURE_2D); |
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218 | glColor4bv(gl_bgpal[attr[0] >> 4]); |
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219 | glBegin(GL_QUADS); |
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220 | glVertex2f(x, y); |
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221 | glVertex2f(x + kk->gl.font_width, y); |
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222 | glVertex2f(x + kk->gl.font_width, y + kk->gl.font_height); |
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223 | glVertex2f(x, y + kk->gl.font_height); |
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224 | glEnd(); |
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225 | |
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226 | attr++; |
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227 | } |
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228 | |
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229 | line++; |
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230 | } |
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231 | |
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232 | /* 2nd pass, avoids changing render state too much */ |
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233 | glEnable(GL_BLEND); |
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234 | glEnable(GL_TEXTURE_2D); |
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235 | glBlendFunc(GL_ONE, GL_ONE); |
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236 | |
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237 | line = 0; |
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238 | for(y = 0; y < kk->gl.height; y += kk->gl.font_height) |
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239 | { |
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240 | uint8_t *attr = kk->qq->attr + line * kk->qq->width; |
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241 | uint32_t *chars = kk->qq->chars + line * kk->qq->width; |
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242 | |
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243 | for(x = 0; x < kk->gl.width; x += kk->gl.font_width) |
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244 | { |
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245 | if(*chars != (uint32_t)' ') |
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246 | { |
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247 | char ch = *chars & 0x7f; |
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248 | |
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249 | /* FIXME: check ch bounds */ |
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250 | glBindTexture(GL_TEXTURE_2D, kk->gl.id[ch - 32]); |
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251 | glColor4bv(gl_bgpal[attr[0] & 0xf]); |
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252 | glBegin(GL_QUADS); |
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253 | glTexCoord2f(0, kk->gl.sh); |
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254 | glVertex2f(x, y); |
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255 | glTexCoord2f(kk->gl.sw, kk->gl.sh); |
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256 | glVertex2f(x + kk->gl.font_width, y); |
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257 | glTexCoord2f(kk->gl.sw, 0); |
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258 | glVertex2f(x + kk->gl.font_width, y + kk->gl.font_height); |
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259 | glTexCoord2f(0, 0); |
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260 | glVertex2f(x, y + kk->gl.font_height); |
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261 | glEnd(); |
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262 | } |
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263 | |
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264 | attr++; |
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265 | chars++; |
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266 | } |
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267 | line++; |
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268 | } |
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269 | glDisable(GL_BLEND); |
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270 | glDisable(GL_TEXTURE_2D); |
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271 | |
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272 | glutMainLoopEvent(); |
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273 | glutSwapBuffers(); |
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274 | glutPostRedisplay(); |
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275 | } |
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276 | |
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277 | static void gl_handle_resize(caca_t *kk, unsigned int *new_width, |
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278 | unsigned int *new_height) |
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279 | { |
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280 | kk->gl.width = kk->gl.new_width; |
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281 | kk->gl.height = kk->gl.new_height; |
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282 | |
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283 | *new_width = kk->gl.width / kk->gl.font_width; |
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284 | *new_height = (kk->gl.height / kk->gl.font_height) + 1; |
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285 | |
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286 | glMatrixMode(GL_PROJECTION); |
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287 | glPushMatrix(); |
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288 | glLoadIdentity(); |
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289 | |
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290 | glViewport(0, 0, kk->gl.width, kk->gl.height); |
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291 | gluOrtho2D(0, kk->gl.width, kk->gl.height, 0); |
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292 | glMatrixMode(GL_MODELVIEW); |
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293 | } |
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294 | |
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295 | static unsigned int gl_get_event(caca_t *kk) |
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296 | { |
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297 | unsigned int event = 0; |
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298 | |
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299 | glutMainLoopEvent(); |
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300 | |
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301 | if(kk->gl.resized && !kk->resize) |
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302 | { |
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303 | kk->resize = 1; |
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304 | kk->gl.resized = 0; |
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305 | return CACA_EVENT_RESIZE; |
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306 | } |
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307 | |
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308 | if(kk->gl.mouse_changed) |
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309 | { |
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310 | if(kk->gl.mouse_clicked) |
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311 | { |
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312 | event |= CACA_EVENT_MOUSE_PRESS | kk->gl.mouse_button; |
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313 | kk->gl.mouse_clicked = 0; |
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314 | } |
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315 | kk->mouse_x = kk->gl.mouse_x; |
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316 | kk->mouse_y = kk->gl.mouse_y; |
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317 | event |= CACA_EVENT_MOUSE_MOTION | (kk->mouse_x << 12) | kk->mouse_y; |
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318 | kk->gl.mouse_changed = 0; |
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319 | } |
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320 | |
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321 | if(kk->gl.key != 0) |
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322 | { |
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323 | event |= CACA_EVENT_KEY_PRESS; |
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324 | event |= kk->gl.key; |
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325 | kk->gl.key = 0; |
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326 | return event; |
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327 | } |
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328 | |
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329 | if(kk->gl.special_key != 0) |
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330 | { |
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331 | event |= CACA_EVENT_KEY_PRESS; |
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332 | |
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333 | switch(kk->gl.special_key) |
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334 | { |
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335 | case GLUT_KEY_F1 : kk->gl.special_key = 0; return event | CACA_KEY_F1; |
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336 | case GLUT_KEY_F2 : kk->gl.special_key = 0; return event | CACA_KEY_F2; |
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337 | case GLUT_KEY_F3 : kk->gl.special_key = 0; return event | CACA_KEY_F3; |
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338 | case GLUT_KEY_F4 : kk->gl.special_key = 0; return event | CACA_KEY_F4; |
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339 | case GLUT_KEY_F5 : kk->gl.special_key = 0; return event | CACA_KEY_F5; |
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340 | case GLUT_KEY_F6 : kk->gl.special_key = 0; return event | CACA_KEY_F6; |
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341 | case GLUT_KEY_F7 : kk->gl.special_key = 0; return event | CACA_KEY_F7; |
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342 | case GLUT_KEY_F8 : kk->gl.special_key = 0; return event | CACA_KEY_F8; |
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343 | case GLUT_KEY_F9 : kk->gl.special_key = 0; return event | CACA_KEY_F9; |
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344 | case GLUT_KEY_F10: kk->gl.special_key = 0; return event | CACA_KEY_F10; |
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345 | case GLUT_KEY_F11: kk->gl.special_key = 0; return event | CACA_KEY_F11; |
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346 | case GLUT_KEY_F12: kk->gl.special_key = 0; return event | CACA_KEY_F12; |
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347 | case GLUT_KEY_LEFT : kk->gl.special_key = 0; return event | CACA_KEY_LEFT; |
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348 | case GLUT_KEY_RIGHT: kk->gl.special_key = 0; return event | CACA_KEY_RIGHT; |
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349 | case GLUT_KEY_UP : kk->gl.special_key = 0; return event | CACA_KEY_UP; |
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350 | case GLUT_KEY_DOWN : kk->gl.special_key = 0; return event | CACA_KEY_DOWN; |
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351 | default: return CACA_EVENT_NONE; |
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352 | } |
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353 | } |
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354 | return CACA_EVENT_NONE; |
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355 | } |
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356 | |
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357 | /* |
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358 | * XXX: following functions are local |
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359 | */ |
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360 | |
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361 | static void gl_handle_keyboard(unsigned char key, int x, int y) |
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362 | { |
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363 | caca_t *kk = gl_kk; |
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364 | |
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365 | kk->gl.key = key; |
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366 | } |
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367 | |
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368 | static void gl_handle_special_key(int key, int x, int y) |
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369 | { |
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370 | caca_t *kk = gl_kk; |
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371 | |
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372 | kk->gl.special_key = key; |
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373 | } |
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374 | |
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375 | static void gl_handle_reshape(int w, int h) |
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376 | { |
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377 | caca_t *kk = gl_kk; |
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378 | |
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379 | if(kk->gl.bit) /* Do not handle reshaping at the first time */ |
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380 | { |
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381 | kk->gl.new_width = w; |
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382 | kk->gl.new_height = h; |
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383 | |
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384 | kk->gl.resized = 1; |
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385 | } |
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386 | else |
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387 | kk->gl.bit = 1; |
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388 | } |
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389 | |
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390 | static void gl_handle_mouse(int button, int state, int x, int y) |
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391 | { |
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392 | caca_t *kk = gl_kk; |
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393 | |
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394 | kk->gl.mouse_clicked = 1; |
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395 | kk->gl.mouse_button = button; |
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396 | kk->gl.mouse_state = state; |
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397 | kk->gl.mouse_x = x / kk->gl.font_width; |
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398 | kk->gl.mouse_y = y / kk->gl.font_height; |
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399 | kk->gl.mouse_changed = 1; |
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400 | } |
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401 | |
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402 | static void gl_handle_mouse_motion(int x, int y) |
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403 | { |
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404 | caca_t *kk = gl_kk; |
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405 | |
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406 | kk->gl.mouse_x = x / kk->gl.font_width; |
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407 | kk->gl.mouse_y = y / kk->gl.font_height; |
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408 | kk->gl.mouse_changed = 1; |
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409 | } |
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410 | |
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411 | /* |
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412 | * Driver initialisation |
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413 | */ |
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414 | |
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415 | void gl_init_driver(caca_t *kk) |
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416 | { |
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417 | kk->driver.driver = CACA_DRIVER_GL; |
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418 | |
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419 | kk->driver.init_graphics = gl_init_graphics; |
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420 | kk->driver.end_graphics = gl_end_graphics; |
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421 | kk->driver.set_window_title = gl_set_window_title; |
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422 | kk->driver.get_window_width = gl_get_window_width; |
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423 | kk->driver.get_window_height = gl_get_window_height; |
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424 | kk->driver.display = gl_display; |
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425 | kk->driver.handle_resize = gl_handle_resize; |
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426 | kk->driver.get_event = gl_get_event; |
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427 | } |
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428 | |
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429 | #endif /* USE_GL */ |
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430 | |
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