141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/* Freetype GL - A C OpenGL Freetype engine
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*
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* Distributed under the OSI-approved BSD 2-Clause License. See accompanying
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* file `LICENSE` for more details.
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "vec234.h"
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#include "platform.h"
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#include "vertex-attribute.h"
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// ----------------------------------------------------------------------------
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vertex_attribute_t *
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vertex_attribute_new( GLchar * name,
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GLint size,
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GLenum type,
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GLboolean normalized,
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GLsizei stride,
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GLvoid *pointer )
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{
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vertex_attribute_t *attribute =
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(vertex_attribute_t *) malloc (sizeof(vertex_attribute_t));
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assert( size > 0 );
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attribute->name = (GLchar *) strdup( name );
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attribute->index = -1;
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attribute->size = size;
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attribute->type = type;
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attribute->normalized = normalized;
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attribute->stride = stride;
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attribute->pointer = pointer;
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return attribute;
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}
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// ----------------------------------------------------------------------------
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void
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vertex_attribute_delete( vertex_attribute_t * self )
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{
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assert( self );
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free( self->name );
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free( self );
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}
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// ----------------------------------------------------------------------------
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vertex_attribute_t *
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vertex_attribute_parse( char *format )
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{
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GLenum type = 0;
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int size;
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int normalized = 0;
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char ctype;
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char *name;
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vertex_attribute_t *attr;
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char *p = strchr(format, ':');
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if( p != NULL)
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{
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name = strndup(format, p-format);
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if( *(++p) == '\0' )
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{
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fprintf( stderr, "No size specified for '%s' attribute\n", name );
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free( name );
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return 0;
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}
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size = *p - '0';
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if( *(++p) == '\0' )
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{
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fprintf( stderr, "No format specified for '%s' attribute\n", name );
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free( name );
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return 0;
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}
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ctype = *p;
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if( *(++p) != '\0' )
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{
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if( *p == 'n' )
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{
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normalized = 1;
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}
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}
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}
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else
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{
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fprintf(stderr, "Vertex attribute format not understood ('%s')\n", format );
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return 0;
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}
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switch( ctype )
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{
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case 'b': type = GL_BYTE; break;
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case 'B': type = GL_UNSIGNED_BYTE; break;
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case 's': type = GL_SHORT; break;
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case 'S': type = GL_UNSIGNED_SHORT; break;
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case 'i': type = GL_INT; break;
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case 'I': type = GL_UNSIGNED_INT; break;
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case 'f': type = GL_FLOAT; break;
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default: type = 0; break;
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}
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attr = vertex_attribute_new( name, size, type, normalized, 0, 0 );
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free( name );
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return attr;
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}
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// ----------------------------------------------------------------------------
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void
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vertex_attribute_enable( vertex_attribute_t *attr )
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{
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if( attr->index == -1 )
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{
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GLint program;
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glGetIntegerv( GL_CURRENT_PROGRAM, &program );
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if( program == 0)
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{
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return;
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}
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attr->index = glGetAttribLocation( program, attr->name );
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if( attr->index == -1 )
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{
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return;
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}
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}
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glEnableVertexAttribArray( attr->index );
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glVertexAttribPointer( attr->index, attr->size, attr->type,
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attr->normalized, attr->stride, attr->pointer );
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}
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