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1 /* ============================================================================
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2 * Freetype GL - A C OpenGL Freetype engine
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3 * Platform: Any
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4 * WWW: http://code.google.com/p/freetype-gl/
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5 * ----------------------------------------------------------------------------
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6 * Copyright 2011,2012 Nicolas P. Rougier. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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10 *
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11 * 1. Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the following disclaimer.
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13 *
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR
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19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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21 * EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28 *
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29 * The views and conclusions contained in the software and documentation are
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30 * those of the authors and should not be interpreted as representing official
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31 * policies, either expressed or implied, of Nicolas P. Rougier.
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32 * ============================================================================
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33 */
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34 #include <assert.h>
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35 #include <string.h>
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36 #include <stdlib.h>
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37 #include <stdio.h>
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38 #include "vec234.h"
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39 #include "platform.h"
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40 #include "vertex-attribute.h"
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41
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42
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43
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44
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45 // ----------------------------------------------------------------------------
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46 vertex_attribute_t *
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47 vertex_attribute_new( GLchar * name,
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48 GLint size,
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49 GLenum type,
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50 GLboolean normalized,
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51 GLsizei stride,
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52 GLvoid *pointer )
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53 {
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54 vertex_attribute_t *attribute =
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55 (vertex_attribute_t *) malloc (sizeof(vertex_attribute_t));
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56
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57 assert( size > 0 );
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58
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59 attribute->name = (GLchar *) strdup( name );
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60 attribute->index = -1;
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61 attribute->size = size;
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62 attribute->type = type;
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63 attribute->normalized = normalized;
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64 attribute->stride = stride;
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65 attribute->pointer = pointer;
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66 return attribute;
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67 }
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68
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69
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70
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71 // ----------------------------------------------------------------------------
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72 void
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73 vertex_attribute_delete( vertex_attribute_t * self )
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74 {
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75 assert( self );
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76
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77 free( self->name );
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78 free( self );
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79 }
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80
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81 #include <stddef.h>
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82
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83 char *
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84 strndup (const char *s, size_t n)
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85 {
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86 char *result;
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87 size_t len = strlen (s);
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88
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89 if (n < len)
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90 len = n;
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91
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92 result = (char *) malloc (len + 1);
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93 if (!result)
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94 return 0;
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95
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96 result[len] = '\0';
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97 return (char *) memcpy (result, s, len);
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98 }
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99
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100
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101 // ----------------------------------------------------------------------------
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102 vertex_attribute_t *
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103 vertex_attribute_parse( char *format )
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104 {
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105 GLenum type = 0;
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106 int size;
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107 int normalized = 0;
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108 char ctype;
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109 char *name;
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110 vertex_attribute_t *attr;
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111 char *p = strchr(format, ':');
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112 if( p != NULL)
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113 {
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114 name = strndup(format, p-format);
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115 if( *(++p) == '\0' )
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116 {
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117 fprintf( stderr, "No size specified for '%s' attribute\n", name );
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118 free( name );
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119 return 0;
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120 }
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121 size = *p - '0';
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122
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123 if( *(++p) == '\0' )
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124 {
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125 fprintf( stderr, "No format specified for '%s' attribute\n", name );
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126 free( name );
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127 return 0;
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128 }
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129 ctype = *p;
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130
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131 if( *(++p) != '\0' )
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132 {
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133 if( *p == 'n' )
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134 {
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135 normalized = 1;
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136 }
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137 }
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138
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139 }
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140 else
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141 {
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142 fprintf(stderr, "Vertex attribute format not understood ('%s')\n", format );
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143 return 0;
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144 }
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145
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146 switch( ctype )
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147 {
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148 case 'b': type = GL_BYTE; break;
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149 case 'B': type = GL_UNSIGNED_BYTE; break;
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150 case 's': type = GL_SHORT; break;
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151 case 'S': type = GL_UNSIGNED_SHORT; break;
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152 case 'i': type = GL_INT; break;
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153 case 'I': type = GL_UNSIGNED_INT; break;
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154 case 'f': type = GL_FLOAT; break;
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155 default: type = 0; break;
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156 }
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157
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158
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159 attr = vertex_attribute_new( name, size, type, normalized, 0, 0 );
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160 free( name );
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161 return attr;
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162 }
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163
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164
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165
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166 // ----------------------------------------------------------------------------
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167 void
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168 vertex_attribute_enable( vertex_attribute_t *attr )
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169 {
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170 if( attr->index == -1 )
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171 {
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172 GLint program;
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173 glGetIntegerv( GL_CURRENT_PROGRAM, &program );
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174 if( program == 0)
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175 {
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176 return;
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177 }
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178 attr->index = glGetAttribLocation( program, attr->name );
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179 if( attr->index == -1 )
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180 {
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181 return;
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182 }
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183 }
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184 glEnableVertexAttribArray( attr->index );
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185 glVertexAttribPointer( attr->index, attr->size, attr->type,
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186 attr->normalized, attr->stride, attr->pointer );
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187 }
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