学步园

lib3ds 2.0 和 opengl32 例子程序

cheungmine

2009-2-13

    本例使用lib3ds库读取3ds文件，并使用opengl绘制。本例不使用贴图，仅仅展示lib3ds2.0的使用过程。这个例子是用lib3ds1.2.0的一个例子的翻版。lib3ds1.2.0已经找不到了。所以，我提供这个2.0版本的例子，以供学习之用。

    需要下载lib3ds2.0的包。编译成动态库。

    下面是例子的源代码player.c。只需要这一个文件。

///////////////////////////////////////////////////////////////////////////////<br /> // player.c<br /> //<br /> // 2009-2-13<br /> //<br /> // 作者：cheungmine<br /> //<br /> // 参考：<br /> //<br /> // http://www.lib3ds.org/lib3ds-1.2.0/examples/player.c<br /> //<br /> // 目录结构：<br /> //<br /> // lib/lib3ds_2.0/src/<br /> // debug/lib3ds20d.lib lib3ds20d.dll<br /> // release/lib3ds20.lib lib3ds20.dll<br /> //<br /> // lib/lib3ds_2.0/<br /> // glut_test/player.c<br /> //<br /> // lib/win_opengl32/<br /> // inc/gl.h glu.h glut.h<br /> // lib/opengl32.lib glu32.lib glut32.lib<br /> // bin/opengl32.dll glu32.dll glut32.dll<br /> //<br /> ///////////////////////////////////////////////////////////////////////////////<br /> // 内存泄漏检测<br /> // 在需要检测的地方放置语句:<br /> // _CrtDumpMemoryLeaks();<br /> // 以下3句的次序不能改变<br /> #define _CRTDBG_MAP_ALLOC<br /> #include<stdlib.h><br /> #include<crtdbg.h></p> <p>#include<stdio.h><br /> #include<string.h><br /> #include<math.h><br /> #include<assert.h></p> <p>#include <windows.h></p> <p>// 使用 USE_SGI_OPENGL 可能在某些机器上运行 wglMakeCurrent 系列函数返回失败的结果<br /> #define GLUT_NO_LIB_PRAGMA</p> <p>// #define USE_SGI_OPENGL<br /> #ifdef USE_SGI_OPENGL<br /> #include "../../sgi-opengl2-sdk/include/gl/gl.h"<br /> #include "../../sgi-opengl2-sdk/include/gl/glu.h"<br /> #include "../../sgi-opengl2-sdk/include/gl/glut.h"</p> <p> #pragma comment(lib, "../../sgi-opengl2-sdk/lib/opengl.lib")<br /> #pragma comment(lib, "../../sgi-opengl2-sdk/lib/glu.lib")<br /> #pragma comment(lib, "../../sgi-opengl2-sdk/lib/glut.lib")<br /> #else<br /> #include "../../win-opengl32/inc/GL.h"<br /> #include "../../win-opengl32/inc/GLU.h"</p> <p> #pragma comment(lib, "../../win-opengl32/lib/OPENGL32.lib")<br /> #pragma comment(lib, "../../win-opengl32/lib/GLU32.lib")</p> <p> #include "../../win-opengl32/inc/GLUT.h"<br /> #pragma comment(lib, "../../win-opengl32/lib/glut32.lib")<br /> #endif</p> <p>//<br /> // lib3ds<br /> //<br /> #include "../src/lib3ds.h"</p> <p>#ifdef _DEBUG<br /> # pragma comment(lib, "../src/debug/lib3ds20d.lib")<br /> #else<br /> # pragma comment(lib, "../src/release/lib3ds20.lib")<br /> #endif</p> <p>static const char* filename="E:/3DS/House/house.3ds";<br /> static Lib3dsFile *model=0;</p> <p>static const char* camera=0;<br /> static float current_frame=0.0;</p> <p>static int gl_width;<br /> static int gl_height;</p> <p>static int camera_menu_id=0;<br /> static int halt=0;</p> <p>#ifndef MAX<br /> # define MAX(x,y) ((x)>(y)?(x):(y))<br /> #endif</p> <p>static void camera_menu(int value)<br /> {<br /> Lib3dsCamera *c;<br /> int i;</p> <p> for( i=0; i<value; i++ ){<br /> if (i==model->ncameras)<br /> return;<br /> c = model->cameras[i];<br /> }<br /> if (c)<br /> camera=c->name;<br /> }</p> <p>static void render_node(Lib3dsNode *node)<br /> {<br /> Lib3dsNode *p;<br /> Lib3dsMesh *mesh;<br /> Lib3dsFace *face;<br /> Lib3dsMaterial *mat;<br /> Lib3dsMeshInstanceNode *meshData;</p> <p> Lib3dsVector *norm_verts;<br /> Lib3dsVector *norm_faces;</p> <p> int i;<br /> unsigned fi;<br /> float M[4][4];</p> <p> assert(model);</p> <p> // 递归<br /> for (p=node->childs; p!=0; p=p->next){<br /> render_node(p);<br /> }</p> <p> if (node->type==LIB3DS_NODE_MESH_INSTANCE)<br /> {<br /> if (strcmp(node->name,"$$$DUMMY")==0) {<br /> return;<br /> }</p> <p> if (!node->user_id)<br /> {<br /> mesh = lib3ds_file_mesh_for_node(model, node);<br /> assert(mesh);<br /> if (!mesh) {<br /> return;<br /> }</p> <p> node->user_id = glGenLists(1);<br /> glNewList(node->user_id, GL_COMPILE);</p> <p> norm_verts = (Lib3dsVector*) malloc(3*sizeof(Lib3dsVector)*mesh->nfaces);<br /> norm_faces = (Lib3dsVector*) malloc(sizeof(Lib3dsVector)*mesh->nfaces); </p> <p> lib3ds_matrix_copy(M, mesh->matrix);<br /> lib3ds_matrix_inv(M);<br /> glMultMatrixf(&M[0][0]);</p> <p> lib3ds_mesh_calculate_face_normals(mesh, (float (*)[3])norm_faces);<br /> lib3ds_mesh_calculate_vertex_normals(mesh, (float (*)[3])norm_verts);</p> <p> for (fi=0; fi<mesh->nfaces; ++fi) {<br /> face = &(mesh->faces[fi]);<br /> mat = 0;</p> <p> if (face->material>=0 && face->material<model->nmaterials)<br /> mat=model->materials[face->material];</p> <p> if (mat)<br /> {<br /> static GLfloat a[4]={0,0,0,1};<br /> float s;<br /> glMaterialfv(GL_FRONT, GL_AMBIENT, a);<br /> glMaterialfv(GL_FRONT, GL_DIFFUSE, mat->diffuse);<br /> glMaterialfv(GL_FRONT, GL_SPECULAR, mat->specular);<br /> s = pow(2, 10.0*mat->shininess);</p> <p> if (s>128.0) {<br /> s=128.0;<br /> }</p> <p> glMaterialf(GL_FRONT, GL_SHININESS, s);<br /> }<br /> else {<br /> float a[]={0.2, 0.2, 0.2, 1.0};<br /> float d[]={0.8, 0.8, 0.8, 1.0};<br /> float s[]={0.0, 0.0, 0.0, 1.0};<br /> glMaterialfv(GL_FRONT, GL_AMBIENT, a);<br /> glMaterialfv(GL_FRONT, GL_DIFFUSE, d);<br /> glMaterialfv(GL_FRONT, GL_SPECULAR, s);<br /> }</p> <p> // Draw tri-face<br /> glBegin(GL_TRIANGLES);</p> <p> glNormal3fv(norm_faces[fi].v); // face normal</p> <p> for (i=0; i<3; ++i) {<br /> glNormal3fv(norm_verts[3*fi+i].v); // vertex normal<br /> glVertex3fv(mesh->vertices[face->index[i]]);<br /> }</p> <p> glEnd();<br /> }</p> <p> free(norm_faces);<br /> free(norm_verts);</p> <p> glEndList();<br /> }</p> <p> if (node->user_id) {<br /> glPushMatrix();<br /> meshData = (Lib3dsMeshInstanceNode*) node;</p> <p> glMultMatrixf(&node->matrix[0][0]);<br /> glTranslatef(-meshData->pivot[0], -meshData->pivot[1], -meshData->pivot[2]);<br /> glCallList(node->user_id);</p> <p> // glutSolidSphere(50.0, 20,20);<br /> glPopMatrix();<br /> }<br /> }<br /> }</p> <p>static void display(void)<br /> {<br /> int i, li;</p> <p> Lib3dsNode *nodC, *nodT, *nod;<br /> Lib3dsCameraNode *camNode;<br /> Lib3dsTargetNode *tgtNode;<br /> float M[4][4];</p> <p> GLfloat a[] = {0.0f, 0.0f, 0.0f, 1.0f};<br /> GLfloat c[] = {1.0f, 1.0f, 1.0f, 1.0f};<br /> GLfloat p[] = {0.0f, 0.0f, 0.0f, 1.0f};</p> <p> Lib3dsLight *l;</p> <p> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);</p> <p> if (!model) {<br /> return;<br /> }</p> <p> nodC=lib3ds_file_node_by_name(model, camera, LIB3DS_NODE_CAMERA);<br /> nodT=lib3ds_file_node_by_name(model, camera, LIB3DS_NODE_CAMERA_TARGET);</p> <p> if (!nodC || !nodT) {<br /> // 本测试程序要求必须存在 camera 和 target<br /> // 这里存在问题？以后的文章再处理不存在的情形<br /> assert(0 && "Camera or Target not found!");<br /> return;<br /> }</p> <p> camNode = (Lib3dsCameraNode*) nodC;<br /> tgtNode = (Lib3dsTargetNode*) nodT;</p> <p> glMatrixMode(GL_PROJECTION);<br /> glLoadIdentity();<br /> gluPerspective( camNode->fov, 1.0*gl_width/gl_height, 100.0, 20000.0);<br /> glMatrixMode(GL_MODELVIEW);<br /> glLoadIdentity();<br /> glRotatef(-90, 1.0, 0,0);</p> <p> li=GL_LIGHT0;</p> <p> for (i=0; i<model->nlights; i++)<br /> {<br /> l = model->lights[i];<br /> glEnable(li);</p> <p> glLightfv(li, GL_AMBIENT, a);<br /> glLightfv(li, GL_DIFFUSE, c);<br /> glLightfv(li, GL_SPECULAR, c); // p?</p> <p> p[0] = l->position[0];<br /> p[1] = l->position[1];<br /> p[2] = l->position[2];<br /> glLightfv(li, GL_POSITION, p);</p> <p> if (!l->spot_light) {<br /> continue;<br /> }</p> <p> p[0] = l->target[0] - l->position[0];<br /> p[1] = l->target[1] - l->position[1];<br /> p[2] = l->target[2] - l->position[2]; </p> <p> glLightfv(li, GL_SPOT_DIRECTION, p);</p> <p> ++li;<br /> }</p> <p> lib3ds_matrix_camera(M, camNode->pos, tgtNode->pos, camNode->roll);</p> <p> glMultMatrixf(&M[0][0]);</p> <p> for (nod=model->nodes; nod!=0; nod=nod->next) {<br /> render_node(nod);<br /> }</p> <p> if (!halt) {<br /> current_frame+=1.0;</p> <p> if (current_frame>model->frames) {<br /> current_frame=0;<br /> }</p> <p> lib3ds_file_eval(model, current_frame);</p> <p> glutSwapBuffers();<br /> glutPostRedisplay();<br /> }<br /> }</p> <p>static void init(void)<br /> {<br /> int i;</p> <p> glClearColor(0.5, 0.5, 0.5, 1.0);<br /> glShadeModel(GL_SMOOTH);<br /> glEnable(GL_LIGHTING);<br /> glEnable(GL_LIGHT0);<br /> glDisable(GL_LIGHT1);<br /> glDepthFunc(GL_LEQUAL);<br /> glEnable(GL_DEPTH_TEST);<br /> glEnable(GL_CULL_FACE);<br /> glCullFace(GL_BACK);<br /> //glDisable(GL_NORMALIZE);<br /> //glPolygonOffset(1.0, 2);</p> <p> model=lib3ds_file_open(filename);<br /> if (!model) {<br /> printf("***ERROR*** Loading 3DS file failed.");<br /> exit(1);<br /> }</p> <p> if (!model->cameras) {<br /> printf("***ERROR*** No Camera found.");<br /> lib3ds_file_free(model);<br /> model=0;<br /> exit(1);<br /> }</p> <p> if (!camera) {<br /> camera = model->cameras[0]->name;<br /> }</p> <p> camera_menu_id = glutCreateMenu(camera_menu);</p> <p> for (i=0; i<model->ncameras; i++){<br /> glutAddMenuEntry(model->cameras[i]->name, i);<br /> }</p> <p> glutAttachMenu(0);</p> <p> lib3ds_file_eval(model, 0);<br /> }</p> <p>static void reshape (int w, int h)<br /> {<br /> gl_width=w;<br /> gl_height=h;<br /> glViewport(0,0,w,h);<br /> }</p> <p>static void keyboard(unsigned char key, int x, int y)<br /> {<br /> switch (key) {<br /> case 27:<br /> exit(0);<br /> break;<br /> case 'h':<br /> halt=!halt;<br /> glutPostRedisplay();<br /> break;<br /> }<br /> }</p> <p>int main(int argc, char** argv)<br /> {<br /> glutInit(&argc, argv);</p> <p> glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);<br /> glutInitWindowSize(640, 480);<br /> glutInitWindowPosition(100, 100);<br /> glutCreateWindow(argv[0]);</p> <p> init();</p> <p> glutDisplayFunc(display);<br /> glutReshapeFunc(reshape);<br /> glutKeyboardFunc(keyboard);<br /> glutMainLoop();</p> <p> /* Memory leaks detecting */<br /> _CrtDumpMemoryLeaks();</p> <p> return(0);<br /> }

运行结果：

例子中使用的3ds23文件来自于：

http://www.sharecg.com/

house.3ds