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Diffstat (limited to 'mesalib/src/glu/sgi/libnurbs/nurbtess/primitiveStream.cc')
| -rw-r--r-- | mesalib/src/glu/sgi/libnurbs/nurbtess/primitiveStream.cc | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/mesalib/src/glu/sgi/libnurbs/nurbtess/primitiveStream.cc b/mesalib/src/glu/sgi/libnurbs/nurbtess/primitiveStream.cc new file mode 100644 index 000000000..26d05342f --- /dev/null +++ b/mesalib/src/glu/sgi/libnurbs/nurbtess/primitiveStream.cc @@ -0,0 +1,190 @@ +/* +** License Applicability. Except to the extent portions of this file are +** made subject to an alternative license as permitted in the SGI Free +** Software License B, Version 1.1 (the "License"), the contents of this +** file are subject only to the provisions of the License. You may not use +** this file except in compliance with the License. You may obtain a copy +** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +** +** http://oss.sgi.com/projects/FreeB +** +** Note that, as provided in the License, the Software is distributed on an +** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +** +** Original Code. The Original Code is: OpenGL Sample Implementation, +** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +** Copyright in any portions created by third parties is as indicated +** elsewhere herein. All Rights Reserved. +** +** Additional Notice Provisions: The application programming interfaces +** established by SGI in conjunction with the Original Code are The +** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +** Window System(R) (Version 1.3), released October 19, 1998. This software +** was created using the OpenGL(R) version 1.2.1 Sample Implementation +** published by SGI, but has not been independently verified as being +** compliant with the OpenGL(R) version 1.2.1 Specification. +** +*/ +/* +*/ + +#include "gluos.h" +#include <stdlib.h> +#include <stdio.h> +#include <assert.h> +#include <GL/gl.h> + +#include "primitiveStream.h" + +Int primStream::num_triangles() +{ + Int i; + Int ret=0; + for(i=0; i<index_lengths; i++) + { + ret += lengths[i]-2; + } + return ret; +} + + + +/*the begining of inserting a new primitive. + *reset counter to be 0. + */ +void primStream::begin() +{ + counter = 0; +} + +void primStream::insert(Real u, Real v) +{ + /*if the space cannot hold u and v, + *we have to expand the array + */ + if(index_vertices+1 >= size_vertices) { + Real* temp = (Real*) malloc (sizeof(Real) * (2*size_vertices + 2)); + assert(temp); + + /*copy*/ + for(Int i=0; i<index_vertices; i++) + temp[i] = vertices[i]; + + free(vertices); + vertices = temp; + size_vertices = 2*size_vertices + 2; + } + + vertices[index_vertices++] = u; + vertices[index_vertices++] = v; + counter++; +} + +/*the end of a primitive. + *increase index_lengths + */ +void primStream::end(Int type) +{ + Int i; + /*if there is no vertex in this primitive, + *nothing needs to be done + */ + if(counter == 0) return ; + + if(index_lengths >= size_lengths){ + Int* temp = (Int*) malloc(sizeof(Int) * (2*size_lengths + 2)); + assert(temp); + Int* tempTypes = (Int*) malloc(sizeof(Int) * (2*size_lengths + 2)); + assert(tempTypes); + + /*copy*/ + for(i=0; i<index_lengths; i++){ + temp[i] = lengths[i]; + tempTypes[i] = types[i]; + } + + free(lengths); + free(types); + lengths = temp; + types = tempTypes; + size_lengths = 2*size_lengths + 2; + } + lengths[index_lengths] = counter; + types[index_lengths] = type; + index_lengths++; +} + +void primStream::print() +{ + Int i,j,k; + printf("index_lengths=%i,size_lengths=%i\n", index_lengths, size_lengths); + printf("index_vertices=%i,size_vertices=%i\n", index_vertices, size_vertices); + k=0; + for(i=0; i<index_lengths; i++) + { + if(types[i] == PRIMITIVE_STREAM_FAN) + printf("primitive-FAN:\n"); + else + printf("primitive-STRIP:\n"); + for(j=0; j<lengths[i]; j++) + { + printf("(%f,%f) ", vertices[k], vertices[k+1]); + k += 2; + } + printf("\n"); + } +} + +primStream::primStream(Int sizeLengths, Int sizeVertices) +{ + lengths = (Int*)malloc (sizeof(Int) * sizeLengths); + assert(lengths); + types = (Int*)malloc (sizeof(Int) * sizeLengths); + assert(types); + + vertices = (Real*) malloc(sizeof(Real) * sizeVertices); + assert(vertices); + + index_lengths = 0; + index_vertices = 0; + size_lengths = sizeLengths; + size_vertices = sizeVertices; +} + +primStream::~primStream() +{ + free(lengths); + free(types); + free(vertices); +} + +void primStream::draw() +{ + Int i,j,k; + k=0; + for(i=0; i<index_lengths; i++) + { + switch(types[i]){ + case PRIMITIVE_STREAM_FAN: + glBegin(GL_TRIANGLE_FAN); + break; + case PRIMITIVE_STREAM_STRIP: + glBegin(GL_TRIANGLE_STRIP); + break; + } + + for(j=0; j<lengths[i]; j++){ + glVertex2fv(vertices+k); + k += 2; + } + glEnd(); + } +} + |