一步步学OpenGL源代码下载

/* ========================================================================= * Freetype GL - A C OpenGL Freetype engine * Platform: Any * WWW: http://code.google.com/p/freetype-gl/ * ------------------------------------------------------------------------- * Copyright 2011 Nicolas P. Rougier. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation are * those of the authors and should not be interpreted as representing official * policies, either expressed or implied, of Nicolas P. Rougier. * ========================================================================= */ #include <assert.h> #include <string.h> #include <stdlib.h> #include <stdio.h> #include <GL/glew.h> #include <GL/freeglut.h> #include "vertex-buffer.h" // ---------------------------------------------------------------------------- VertexBuffer * vertex_buffer_new( const char *format ) { size_t i, index = 0, stride = 0; const char *start = 0, *end = 0; GLvoid *pointer = 0; VertexBuffer *self = (VertexBuffer *) malloc (sizeof(VertexBuffer)); if( !self ) { return NULL; } self->format = strdup( format ); for( i=0; i<MAX_VERTEX_ATTRIBUTE; ++i ) { self->attributes[i] = 0; } start = format; do { end = (char *) (strchr(start+1, ':')); char *desc = 0; if (end == NULL) { desc = strdup(start); } else { desc = strndup(start, end-start); } VertexAttribute *attribute = vertex_attribute_parse( index, desc ); start = end+1; free(desc); attribute->pointer = pointer; stride += attribute->size*GL_TYPE_SIZE( attribute->type ); pointer+= attribute->size*GL_TYPE_SIZE( attribute->type ); self->attributes[index] = attribute; index++; } while ( end && (index < MAX_VERTEX_ATTRIBUTE) ); for( i=0; i<index; ++i ) { self->attributes[i]->stride = stride; } self->vertices = vector_new( stride ); self->vertices_id = 0; self->indices = vector_new( sizeof(GLuint) ); self->indices_id = 0; self->dirty = 1; return self; } // ---------------------------------------------------------------------------- VertexBuffer * vertex_buffer_new_from_data( char *format, size_t vcount, void *vertices, size_t icount, GLuint *indices ) { VertexBuffer *self = vertex_buffer_new( format ); vector_resize( self->vertices, vcount ); assert( self->vertices->size == vcount); memcpy( self->vertices->items, vertices, vcount*self->vertices->item_size ); vector_resize( self->indices, icount ); assert( self->indices->size == icount); memcpy( self->indices->items, indices, icount*self->indices->item_size ); self->dirty = 1; return self; } // ---------------------------------------------------------------------------- void vertex_buffer_delete( VertexBuffer *self ) { assert( self ); vector_delete( self->vertices ); self->vertices = 0; if( self->vertices_id ) { glDeleteBuffers( 1, &self->vertices_id ); } self->vertices_id = 0; vector_delete( self->indices ); self->indices = 0; if( self->indices_id ) { glDeleteBuffers( 1, &self->vertices_id ); } self->indices_id = 0; if( self->format ) { free( self->format ); } self->format = 0; self->dirty = 0; free( self ); } // ---------------------------------------------------------------------------- void vertex_buffer_print( VertexBuffer * self ) { assert(self); int i = 0; fprintf( stderr, "%ld vertices, %ld indices\n", vector_size( self->vertices ), vector_size( self->indices ) ); while( self->attributes[i] ) { if( self->attributes[i]->target > 0 ) { switch(self->attributes[i]->target ) { case GL_VERTEX_ARRAY: fprintf( stderr, " -> Position: "); break; case GL_NORMAL_ARRAY: fprintf( stderr, " -> Normal: "); break; case GL_COLOR_ARRAY: fprintf( stderr, " -> Color: "); break; case GL_TEXTURE_COORD_ARRAY: fprintf( stderr, " -> Texture coord: "); break; case GL_FOG_COORD_ARRAY: fprintf( stderr, " -> Fog coord: "); break; case GL_SECONDARY_COLOR_ARRAY: fprintf( stderr, " -> Secondary color: "); break; case GL_EDGE_FLAG_ARRAY: fprintf( stderr, " -> Edge flag: "); break; default: fprintf( stderr, " -> Unknown: "); break; } } else { fprintf( stderr, " -> Generic attribute n°%d: ", self->attributes[i]->index ); } fprintf(stderr, "%dx%s (+%ld)\n", self->attributes[i]->size, GL_TYPE_STRING( self->attributes[i]->type ), (long) self->attributes[i]->pointer); i += 1; } } // ---------------------------------------------------------------------------- void vertex_buffer_upload ( VertexBuffer *self ) { if( !self->vertices_id ) { glGenBuffers( 1, &self->vertices_id ); } if( !self->indices_id ) { glGenBuffers( 1, &self->indices_id ); } glBindBuffer( GL_ARRAY_BUFFER, self->vertices_id ); glBufferData( GL_ARRAY_BUFFER, self->vertices->size*self->vertices->item_size, self->vertices->items, GL_DYNAMIC_DRAW ); glBindBuffer( GL_ARRAY_BUFFER, 0 ); glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, self->indices_id ); glBufferData( GL_ELEMENT_ARRAY_BUFFER, self->indices->size*self->indices->item_size, self->indices->items, GL_DYNAMIC_DRAW ); glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 ); } // ---------------------------------------------------------------------------- void vertex_buffer_clear( VertexBuffer *self ) { assert( self ); vector_clear( self->indices ); vector_clear( self->vertices ); self->dirty = 1; } // ---------------------------------------------------------------------------- void vertex_buffer_render ( VertexBuffer *self, GLenum mode, const char *what ) { assert( self ); if( !self->vertices->size )