1 | /* |
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2 | * libcaca Colour 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 | * $Id: driver_gl.c 810 2006-04-18 12:59:07Z sam $ |
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7 | * |
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8 | * This library is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the Do What The Fuck You Want To |
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10 | * Public License, Version 2, as published by Sam Hocevar. See |
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11 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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12 | */ |
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13 | |
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14 | /* |
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15 | * This file contains the libcaca OpenGL input and output driver |
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16 | */ |
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17 | |
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18 | #include "config.h" |
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19 | |
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20 | #if defined(USE_GL) |
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21 | |
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22 | #ifdef HAVE_OPENGL_GL_H |
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23 | # include <OpenGL/gl.h> |
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24 | # include <GLUT/glut.h> |
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25 | #else |
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26 | # include <GL/gl.h> |
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27 | # include <GL/glut.h> |
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28 | # include <GL/freeglut_ext.h> |
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29 | #endif |
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30 | |
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31 | #include <string.h> |
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32 | #include <stdlib.h> |
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33 | #include <stdio.h> |
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34 | |
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35 | #include "caca.h" |
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36 | #include "caca_internals.h" |
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37 | #include "cucul.h" |
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38 | #include "cucul_internals.h" |
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39 | |
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40 | /* |
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41 | * Global variables |
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42 | */ |
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43 | |
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44 | static caca_t *gl_kk; /* FIXME: we ought to get rid of this */ |
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45 | |
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46 | /* |
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47 | * Local functions |
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48 | */ |
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49 | static void gl_handle_keyboard(unsigned char, int, int); |
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50 | static void gl_handle_special_key(int, int, int); |
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51 | static void gl_handle_reshape(int, int); |
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52 | static void gl_handle_mouse(int, int, int, int); |
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53 | static void gl_handle_mouse_motion(int, int); |
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54 | #ifdef HAVE_GLUTCLOSEFUNC |
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55 | static void gl_handle_close(void); |
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56 | #endif |
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57 | static void _display(void); |
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58 | |
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59 | struct driver_private |
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60 | { |
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61 | int window; |
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62 | unsigned int width, height; |
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63 | unsigned int new_width, new_height; |
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64 | float font_width, font_height; |
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65 | float incx, incy; |
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66 | int id[128 - 32]; |
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67 | unsigned char close; |
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68 | unsigned char bit; |
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69 | unsigned char mouse_changed, mouse_clicked; |
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70 | unsigned int mouse_x, mouse_y; |
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71 | unsigned int mouse_button, mouse_state; |
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72 | |
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73 | unsigned char key; |
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74 | int special_key; |
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75 | |
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76 | float sw, sh; |
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77 | }; |
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78 | |
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79 | static int gl_init_graphics(caca_t *kk) |
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80 | { |
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81 | char *empty_texture; |
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82 | char const *geometry; |
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83 | char *argv[2] = { "", NULL }; |
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84 | unsigned int width = 0, height = 0; |
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85 | int argc = 1; |
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86 | int i; |
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87 | |
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88 | kk->drv.p = malloc(sizeof(struct driver_private)); |
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89 | |
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90 | gl_kk = kk; |
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91 | |
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92 | #if defined(HAVE_GETENV) |
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93 | geometry = getenv("CACA_GEOMETRY"); |
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94 | if(geometry && *geometry) |
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95 | sscanf(geometry, "%ux%u", &width, &height); |
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96 | #endif |
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97 | |
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98 | if(width && height) |
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99 | _cucul_set_size(kk->c, width, height); |
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100 | |
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101 | kk->drv.p->font_width = 9; |
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102 | kk->drv.p->font_height = 15; |
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103 | |
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104 | kk->drv.p->width = kk->c->width * kk->drv.p->font_width; |
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105 | kk->drv.p->height = kk->c->height * kk->drv.p->font_height; |
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106 | |
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107 | #ifdef HAVE_GLUTCLOSEFUNC |
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108 | kk->drv.p->close = 0; |
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109 | #endif |
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110 | kk->drv.p->bit = 0; |
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111 | |
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112 | kk->drv.p->mouse_changed = kk->drv.p->mouse_clicked = 0; |
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113 | kk->drv.p->mouse_button = kk->drv.p->mouse_state = 0; |
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114 | |
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115 | kk->drv.p->key = 0; |
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116 | kk->drv.p->special_key = 0; |
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117 | |
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118 | kk->drv.p->sw = 9.0f / 16.0f; |
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119 | kk->drv.p->sh = 15.0f / 16.0f; |
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120 | |
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121 | glutInit(&argc, argv); |
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122 | |
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123 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); |
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124 | glutInitWindowSize(kk->drv.p->width, kk->drv.p->height); |
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125 | kk->drv.p->window = glutCreateWindow("caca for GL"); |
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126 | |
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127 | gluOrtho2D(0, kk->drv.p->width, kk->drv.p->height, 0); |
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128 | |
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129 | glDisable(GL_CULL_FACE); |
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130 | glDisable(GL_DEPTH_TEST); |
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131 | |
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132 | glutKeyboardFunc(gl_handle_keyboard); |
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133 | glutSpecialFunc(gl_handle_special_key); |
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134 | glutReshapeFunc(gl_handle_reshape); |
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135 | glutDisplayFunc(_display); |
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136 | |
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137 | #ifdef HAVE_GLUTCLOSEFUNC |
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138 | glutCloseFunc(gl_handle_close); |
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139 | #endif |
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140 | |
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141 | glutMouseFunc(gl_handle_mouse); |
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142 | glutMotionFunc(gl_handle_mouse_motion); |
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143 | glutPassiveMotionFunc(gl_handle_mouse_motion); |
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144 | |
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145 | glLoadIdentity(); |
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146 | |
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147 | glMatrixMode(GL_PROJECTION); |
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148 | glPushMatrix(); |
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149 | glLoadIdentity(); |
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150 | gluOrtho2D(0, kk->drv.p->width, kk->drv.p->height, 0); |
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151 | |
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152 | glMatrixMode(GL_MODELVIEW); |
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153 | |
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154 | glClear(GL_COLOR_BUFFER_BIT); |
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155 | |
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156 | empty_texture = malloc(16 * 16 * 4); |
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157 | if(empty_texture == NULL) |
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158 | return -1; |
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159 | |
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160 | memset(empty_texture, 0xff, 16 * 16 * 4); |
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161 | glEnable(GL_TEXTURE_2D); |
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162 | |
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163 | for(i = 32; i < 128; i++) |
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164 | { |
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165 | glGenTextures(1, (GLuint*)&kk->drv.p->id[i - 32]); |
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166 | glBindTexture(GL_TEXTURE_2D, kk->drv.p->id[i - 32]); |
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167 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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168 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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169 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, |
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170 | 16, 16, 0, GL_RGB, GL_UNSIGNED_BYTE, empty_texture); |
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171 | } |
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172 | |
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173 | for(i = 32; i < 128; i++) |
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174 | { |
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175 | glDisable(GL_TEXTURE_2D); |
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176 | glClear(GL_COLOR_BUFFER_BIT); |
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177 | |
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178 | glColor3f(1, 1, 1); |
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179 | glRasterPos2f(0, 15); |
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180 | glutBitmapCharacter(GLUT_BITMAP_9_BY_15, i); |
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181 | |
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182 | glEnable(GL_TEXTURE_2D); |
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183 | glBindTexture(GL_TEXTURE_2D, kk->drv.p->id[i - 32]); |
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184 | glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, |
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185 | 0, kk->drv.p->height - 16, 16, 16, 0); |
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186 | |
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187 | #ifdef HAVE_GLUTCHECKLOOP |
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188 | glutCheckLoop(); |
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189 | #else |
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190 | glutMainLoopEvent(); |
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191 | #endif |
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192 | glutPostRedisplay(); |
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193 | } |
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194 | |
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195 | return 0; |
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196 | } |
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197 | |
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198 | static int gl_end_graphics(caca_t *kk) |
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199 | { |
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200 | glutDestroyWindow(kk->drv.p->window); |
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201 | free(kk->drv.p); |
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202 | return 0; |
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203 | } |
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204 | |
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205 | static int gl_set_window_title(caca_t *kk, char const *title) |
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206 | { |
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207 | glutSetWindowTitle(title); |
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208 | return 0; |
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209 | } |
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210 | |
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211 | static unsigned int gl_get_window_width(caca_t *kk) |
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212 | { |
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213 | return kk->drv.p->width; |
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214 | } |
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215 | |
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216 | static unsigned int gl_get_window_height(caca_t *kk) |
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217 | { |
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218 | return kk->drv.p->height; |
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219 | } |
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220 | |
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221 | static void gl_display(caca_t *kk) |
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222 | { |
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223 | unsigned int x, y, line; |
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224 | |
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225 | glClear(GL_COLOR_BUFFER_BIT); |
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226 | |
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227 | line = 0; |
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228 | for(y = 0; y < kk->drv.p->height; y += kk->drv.p->font_height) |
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229 | { |
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230 | uint32_t *attr = kk->c->attr + line * kk->c->width; |
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231 | |
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232 | for(x = 0; x < kk->drv.p->width; x += kk->drv.p->font_width) |
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233 | { |
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234 | uint16_t bg = _cucul_argb32_to_rgb12bg(*attr++); |
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235 | glDisable(GL_TEXTURE_2D); |
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236 | glColor3b(((bg & 0xf00) >> 8) * 8, |
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237 | ((bg & 0x0f0) >> 4) * 8, |
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238 | (bg & 0x00f) * 8); |
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239 | glBegin(GL_QUADS); |
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240 | glVertex2f(x, y); |
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241 | glVertex2f(x + kk->drv.p->font_width, y); |
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242 | glVertex2f(x + kk->drv.p->font_width, |
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243 | y + kk->drv.p->font_height); |
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244 | glVertex2f(x, y + kk->drv.p->font_height); |
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245 | glEnd(); |
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246 | } |
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247 | |
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248 | line++; |
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249 | } |
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250 | |
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251 | /* 2nd pass, avoids changing render state too much */ |
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252 | glEnable(GL_BLEND); |
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253 | glEnable(GL_TEXTURE_2D); |
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254 | glBlendFunc(GL_ONE, GL_ONE); |
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255 | |
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256 | line = 0; |
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257 | for(y = 0; y < kk->drv.p->height; y += kk->drv.p->font_height) |
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258 | { |
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259 | uint32_t *attr = kk->c->attr + line * kk->c->width; |
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260 | uint32_t *chars = kk->c->chars + line * kk->c->width; |
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261 | |
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262 | for(x = 0; x < kk->drv.p->width; x += kk->drv.p->font_width) |
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263 | { |
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264 | uint32_t c = *chars++; |
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265 | |
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266 | if(c > 0x00000020 && c < 0x00000080) |
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267 | { |
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268 | uint16_t fg = _cucul_argb32_to_rgb12fg(*attr); |
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269 | glBindTexture(GL_TEXTURE_2D, kk->drv.p->id[c - 32]); |
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270 | glColor3b(((fg & 0xf00) >> 8) * 8, |
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271 | ((fg & 0x0f0) >> 4) * 8, |
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272 | (fg & 0x00f) * 8); |
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273 | glBegin(GL_QUADS); |
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274 | glTexCoord2f(0, kk->drv.p->sh); |
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275 | glVertex2f(x, y); |
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276 | glTexCoord2f(kk->drv.p->sw, kk->drv.p->sh); |
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277 | glVertex2f(x + kk->drv.p->font_width, y); |
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278 | glTexCoord2f(kk->drv.p->sw, 0); |
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279 | glVertex2f(x + kk->drv.p->font_width, |
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280 | y + kk->drv.p->font_height); |
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281 | glTexCoord2f(0, 0); |
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282 | glVertex2f(x, y + kk->drv.p->font_height); |
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283 | glEnd(); |
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284 | } |
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285 | |
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286 | attr++; |
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287 | } |
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288 | line++; |
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289 | } |
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290 | glDisable(GL_BLEND); |
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291 | glDisable(GL_TEXTURE_2D); |
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292 | |
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293 | #ifdef HAVE_GLUTCHECKLOOP |
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294 | glutCheckLoop(); |
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295 | #else |
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296 | glutMainLoopEvent(); |
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297 | #endif |
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298 | glutSwapBuffers(); |
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299 | glutPostRedisplay(); |
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300 | } |
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301 | |
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302 | static void gl_handle_resize(caca_t *kk) |
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303 | { |
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304 | kk->drv.p->width = kk->drv.p->new_width; |
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305 | kk->drv.p->height = kk->drv.p->new_height; |
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306 | |
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307 | glMatrixMode(GL_PROJECTION); |
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308 | glPushMatrix(); |
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309 | glLoadIdentity(); |
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310 | |
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311 | glViewport(0, 0, kk->drv.p->width, kk->drv.p->height); |
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312 | gluOrtho2D(0, kk->drv.p->width, kk->drv.p->height, 0); |
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313 | glMatrixMode(GL_MODELVIEW); |
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314 | } |
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315 | |
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316 | static int gl_get_event(caca_t *kk, caca_event_t *ev) |
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317 | { |
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318 | #ifdef HAVE_GLUTCHECKLOOP |
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319 | glutCheckLoop(); |
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320 | #else |
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321 | glutMainLoopEvent(); |
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322 | #endif |
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323 | |
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324 | #ifdef HAVE_GLUTCLOSEFUNC |
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325 | if(kk->drv.p->close) |
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326 | { |
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327 | kk->drv.p->close = 0; |
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328 | ev->type = CACA_EVENT_QUIT; |
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329 | return 1; |
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330 | } |
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331 | #endif |
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332 | |
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333 | if(kk->resize.resized) |
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334 | { |
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335 | ev->type = CACA_EVENT_RESIZE; |
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336 | ev->data.resize.w = kk->c->width; |
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337 | ev->data.resize.h = kk->c->height; |
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338 | return 1; |
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339 | } |
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340 | |
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341 | if(kk->drv.p->mouse_changed) |
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342 | { |
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343 | ev->type = CACA_EVENT_MOUSE_MOTION; |
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344 | ev->data.mouse.x = kk->mouse.x; |
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345 | ev->data.mouse.y = kk->mouse.y; |
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346 | kk->drv.p->mouse_changed = 0; |
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347 | |
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348 | if(kk->drv.p->mouse_clicked) |
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349 | { |
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350 | _push_event(kk, ev); |
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351 | ev->type = CACA_EVENT_MOUSE_PRESS; |
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352 | ev->data.mouse.button = kk->drv.p->mouse_button; |
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353 | kk->drv.p->mouse_clicked = 0; |
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354 | } |
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355 | |
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356 | return 1; |
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357 | } |
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358 | |
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359 | if(kk->drv.p->key != 0) |
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360 | { |
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361 | ev->type = CACA_EVENT_KEY_PRESS; |
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362 | ev->data.key.ch = kk->drv.p->key; |
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363 | ev->data.key.ucs4 = (uint32_t)kk->drv.p->key; |
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364 | ev->data.key.utf8[0] = kk->drv.p->key; |
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365 | ev->data.key.utf8[1] = '\0'; |
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366 | kk->drv.p->key = 0; |
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367 | return 1; |
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368 | } |
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369 | |
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370 | if(kk->drv.p->special_key != 0) |
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371 | { |
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372 | switch(kk->drv.p->special_key) |
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373 | { |
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374 | case GLUT_KEY_F1 : ev->data.key.ch = CACA_KEY_F1; break; |
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375 | case GLUT_KEY_F2 : ev->data.key.ch = CACA_KEY_F2; break; |
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376 | case GLUT_KEY_F3 : ev->data.key.ch = CACA_KEY_F3; break; |
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377 | case GLUT_KEY_F4 : ev->data.key.ch = CACA_KEY_F4; break; |
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378 | case GLUT_KEY_F5 : ev->data.key.ch = CACA_KEY_F5; break; |
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379 | case GLUT_KEY_F6 : ev->data.key.ch = CACA_KEY_F6; break; |
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380 | case GLUT_KEY_F7 : ev->data.key.ch = CACA_KEY_F7; break; |
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381 | case GLUT_KEY_F8 : ev->data.key.ch = CACA_KEY_F8; break; |
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382 | case GLUT_KEY_F9 : ev->data.key.ch = CACA_KEY_F9; break; |
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383 | case GLUT_KEY_F10: ev->data.key.ch = CACA_KEY_F10; break; |
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384 | case GLUT_KEY_F11: ev->data.key.ch = CACA_KEY_F11; break; |
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385 | case GLUT_KEY_F12: ev->data.key.ch = CACA_KEY_F12; break; |
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386 | case GLUT_KEY_LEFT : ev->data.key.ch = CACA_KEY_LEFT; break; |
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387 | case GLUT_KEY_RIGHT: ev->data.key.ch = CACA_KEY_RIGHT; break; |
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388 | case GLUT_KEY_UP : ev->data.key.ch = CACA_KEY_UP; break; |
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389 | case GLUT_KEY_DOWN : ev->data.key.ch = CACA_KEY_DOWN; break; |
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390 | default: ev->type = CACA_EVENT_NONE; return 0; |
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391 | } |
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392 | |
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393 | ev->type = CACA_EVENT_KEY_PRESS; |
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394 | ev->data.key.ucs4 = 0; |
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395 | ev->data.key.utf8[0] = '\0'; |
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396 | |
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397 | kk->drv.p->special_key = 0; |
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398 | return 1; |
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399 | } |
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400 | |
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401 | ev->type = CACA_EVENT_NONE; |
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402 | return 0; |
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403 | } |
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404 | |
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405 | |
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406 | static void gl_set_mouse(caca_t *kk, int flag) |
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407 | { |
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408 | if(flag) |
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409 | glutSetCursor(GLUT_CURSOR_RIGHT_ARROW); |
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410 | else |
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411 | glutSetCursor(GLUT_CURSOR_NONE); |
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412 | } |
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413 | |
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414 | /* |
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415 | * XXX: following functions are local |
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416 | */ |
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417 | |
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418 | static void gl_handle_keyboard(unsigned char key, int x, int y) |
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419 | { |
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420 | caca_t *kk = gl_kk; |
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421 | |
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422 | kk->drv.p->key = key; |
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423 | } |
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424 | |
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425 | static void gl_handle_special_key(int key, int x, int y) |
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426 | { |
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427 | caca_t *kk = gl_kk; |
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428 | |
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429 | kk->drv.p->special_key = key; |
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430 | } |
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431 | |
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432 | static void gl_handle_reshape(int w, int h) |
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433 | { |
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434 | caca_t *kk = gl_kk; |
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435 | |
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436 | if(kk->drv.p->bit) /* Do not handle reshaping at the first time */ |
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437 | { |
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438 | kk->drv.p->new_width = w; |
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439 | kk->drv.p->new_height = h; |
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440 | |
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441 | kk->resize.w = w / kk->drv.p->font_width; |
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442 | kk->resize.h = (h / kk->drv.p->font_height) + 1; |
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443 | |
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444 | kk->resize.resized = 1; |
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445 | } |
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446 | else |
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447 | kk->drv.p->bit = 1; |
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448 | } |
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449 | |
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450 | static void gl_handle_mouse(int button, int state, int x, int y) |
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451 | { |
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452 | caca_t *kk = gl_kk; |
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453 | |
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454 | kk->drv.p->mouse_clicked = 1; |
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455 | kk->drv.p->mouse_button = button; |
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456 | kk->drv.p->mouse_state = state; |
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457 | kk->drv.p->mouse_x = x / kk->drv.p->font_width; |
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458 | kk->drv.p->mouse_y = y / kk->drv.p->font_height; |
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459 | kk->mouse.x = kk->drv.p->mouse_x; |
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460 | kk->mouse.y = kk->drv.p->mouse_y; |
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461 | kk->drv.p->mouse_changed = 1; |
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462 | } |
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463 | |
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464 | static void gl_handle_mouse_motion(int x, int y) |
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465 | { |
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466 | caca_t *kk = gl_kk; |
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467 | kk->drv.p->mouse_x = x / kk->drv.p->font_width; |
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468 | kk->drv.p->mouse_y = y / kk->drv.p->font_height; |
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469 | kk->mouse.x = kk->drv.p->mouse_x; |
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470 | kk->mouse.y = kk->drv.p->mouse_y; |
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471 | kk->drv.p->mouse_changed = 1; |
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472 | } |
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473 | |
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474 | #ifdef HAVE_GLUTCLOSEFUNC |
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475 | static void gl_handle_close(void) |
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476 | { |
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477 | caca_t *kk = gl_kk; |
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478 | kk->drv.p->close = 1; |
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479 | } |
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480 | #endif |
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481 | |
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482 | static void _display(void) |
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483 | { |
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484 | caca_t *kk = gl_kk; |
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485 | gl_display(kk); |
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486 | } |
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487 | |
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488 | |
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489 | /* |
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490 | * Driver initialisation |
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491 | */ |
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492 | |
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493 | int gl_install(caca_t *kk) |
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494 | { |
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495 | #if defined(HAVE_GETENV) && defined(GLUT_XLIB_IMPLEMENTATION) |
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496 | if(!getenv("DISPLAY") || !*(getenv("DISPLAY"))) |
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497 | return -1; |
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498 | #endif |
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499 | |
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500 | kk->drv.driver = CACA_DRIVER_GL; |
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501 | |
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502 | kk->drv.init_graphics = gl_init_graphics; |
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503 | kk->drv.end_graphics = gl_end_graphics; |
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504 | kk->drv.set_window_title = gl_set_window_title; |
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505 | kk->drv.get_window_width = gl_get_window_width; |
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506 | kk->drv.get_window_height = gl_get_window_height; |
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507 | kk->drv.display = gl_display; |
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508 | kk->drv.handle_resize = gl_handle_resize; |
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509 | kk->drv.get_event = gl_get_event; |
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510 | kk->drv.set_mouse = gl_set_mouse; |
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511 | |
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512 | return 0; |
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513 | } |
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514 | |
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515 | #endif /* USE_GL */ |
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516 | |
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