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An example of lib3ds 2.0 with opengl32

非凡兔 2023-01-27 阅读 122
floatmatrixfilekeyboardmenuOpenStack云计算


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。

 

///
// player.c
//
// 2009-2-13
//
// 作者：cheungmine
//
// 参考：
//
//      http://www.lib3ds.org/lib3ds-1.2.0/examples/player.c
//
// 目录结构：
//
// lib/lib3ds_2.0/src/
//      debug/lib3ds20d.lib  lib3ds20d.dll
//          release/lib3ds20.lib  lib3ds20.dll
//
// lib/lib3ds_2.0/
//          glut_test/player.c
//
// lib/win_opengl32/
//          inc/gl.h  glu.h   glut.h
//          lib/opengl32.lib  glu32.lib   glut32.lib
//          bin/opengl32.dll  glu32.dll   glut32.dll
//
///
// 内存泄漏检测
// 在需要检测的地方放置语句:
//        _CrtDumpMemoryLeaks();
// 以下3句的次序不能改变
#define _CRTDBG_MAP_ALLOC 
#include<stdlib.h>
#include<crtdbg.h>

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<assert.h>

#include <windows.h>

// 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
#define GLUT_NO_LIB_PRAGMA

// #define USE_SGI_OPENGL
#ifdef USE_SGI_OPENGL
  #include "../../sgi-opengl2-sdk/include/gl/gl.h"
  #include "../../sgi-opengl2-sdk/include/gl/glu.h"
  #include "../../sgi-opengl2-sdk/include/gl/glut.h"

  #pragma comment(lib, "../../sgi-opengl2-sdk/lib/opengl.lib")
  #pragma comment(lib, "../../sgi-opengl2-sdk/lib/glu.lib")
  #pragma comment(lib, "../../sgi-opengl2-sdk/lib/glut.lib")
#else
  #include "../../win-opengl32/inc/GL.h"
  #include "../../win-opengl32/inc/GLU.h"

  #pragma comment(lib, "../../win-opengl32/lib/OPENGL32.lib")
  #pragma comment(lib, "../../win-opengl32/lib/GLU32.lib")

  #include "../../win-opengl32/inc/GLUT.h"
  #pragma comment(lib, "../../win-opengl32/lib/glut32.lib")
#endif

//
// lib3ds
//
#include "../src/lib3ds.h"

#ifdef _DEBUG
#  pragma comment(lib, "../src/debug/lib3ds20d.lib")
#else
#  pragma comment(lib, "../src/release/lib3ds20.lib")
#endif

static const char* filename="E:/3DS/House/house.3ds";
static Lib3dsFile *model=0;

static const char* camera=0;
static float current_frame=0.0;

static int gl_width;
static int gl_height;

static int camera_menu_id=0;
static int halt=0;

#ifndef MAX
#  define MAX(x,y)  ((x)>(y)?(x):(y))
#endif

static void camera_menu(int value) 
{
  Lib3dsCamera *c;
  int i;

  for( i=0; i<value; i++ ){
    if (i==model->ncameras)
      return;
    c = model->cameras[i];
  }
  if (c)
    camera=c->name;
}

static void render_node(Lib3dsNode *node)
{
  Lib3dsNode    *p;
  Lib3dsMesh    *mesh;
  Lib3dsFace    *face;
  Lib3dsMaterial  *mat;
  Lib3dsMeshInstanceNode *meshData;

  Lib3dsVector  *norm_verts;
  Lib3dsVector  *norm_faces;
  
  int         i;
  unsigned  fi;
  float   M[4][4];

  assert(model);

  // 递归
  for (p=node->childs; p!=0; p=p->next){
    render_node(p);
  }

  if (node->type==LIB3DS_NODE_MESH_INSTANCE)
  {
    if (strcmp(node->name,"$$$DUMMY")==0) {
      return;
    }

    if (!node->user_id) 
    {
      mesh = lib3ds_file_mesh_for_node(model, node);
      assert(mesh);
      if (!mesh) {
        return;
      }

      node->user_id = glGenLists(1);
      glNewList(node->user_id, GL_COMPILE);
      
      norm_verts = (Lib3dsVector*) malloc(3*sizeof(Lib3dsVector)*mesh->nfaces);
      norm_faces = (Lib3dsVector*) malloc(sizeof(Lib3dsVector)*mesh->nfaces);        

      lib3ds_matrix_copy(M, mesh->matrix);
      lib3ds_matrix_inv(M);
      glMultMatrixf(&M[0][0]);
      
      lib3ds_mesh_calculate_face_normals(mesh, (float (*)[3])norm_faces);
      lib3ds_mesh_calculate_vertex_normals(mesh, (float (*)[3])norm_verts);
      
      for (fi=0; fi<mesh->nfaces; ++fi) {
        face = &(mesh->faces[fi]);
        mat = 0;
        
        if (face->material>=0 && face->material<model->nmaterials)
          mat=model->materials[face->material];
        
        if (mat) 
        {
          static GLfloat a[4]={0,0,0,1};
          float s;
          glMaterialfv(GL_FRONT, GL_AMBIENT, a);
          glMaterialfv(GL_FRONT, GL_DIFFUSE, mat->diffuse);
          glMaterialfv(GL_FRONT, GL_SPECULAR, mat->specular);
          s = pow(2, 10.0*mat->shininess);
          
          if (s>128.0) {
            s=128.0;
          }

          glMaterialf(GL_FRONT, GL_SHININESS, s);
        }
        else {
          float a[]={0.2, 0.2, 0.2, 1.0};
          float d[]={0.8, 0.8, 0.8, 1.0};
          float s[]={0.0, 0.0, 0.0, 1.0};
          glMaterialfv(GL_FRONT, GL_AMBIENT, a);
          glMaterialfv(GL_FRONT, GL_DIFFUSE, d);
          glMaterialfv(GL_FRONT, GL_SPECULAR, s);
        }
        
        // Draw tri-face
        glBegin(GL_TRIANGLES);
        
        glNormal3fv(norm_faces[fi].v);  // face normal

        for (i=0; i<3; ++i) {
          glNormal3fv(norm_verts[3*fi+i].v);  // vertex normal
          glVertex3fv(mesh->vertices[face->index[i]]);
        }

        glEnd();
      }

      free(norm_faces);
      free(norm_verts);
      
      glEndList();
    }

    if (node->user_id) {
      glPushMatrix();
      meshData = (Lib3dsMeshInstanceNode*) node;
      
      glMultMatrixf(&node->matrix[0][0]);
      glTranslatef(-meshData->pivot[0], -meshData->pivot[1], -meshData->pivot[2]);
      glCallList(node->user_id);

      // glutSolidSphere(50.0, 20,20);
      glPopMatrix();
    }
  }
}

static void display(void)
{
  int  i, li;

  Lib3dsNode *nodC, *nodT, *nod;
  Lib3dsCameraNode *camNode;
  Lib3dsTargetNode *tgtNode;
  float       M[4][4];
  
  GLfloat a[] = {0.0f, 0.0f, 0.0f, 1.0f};
  GLfloat c[] = {1.0f, 1.0f, 1.0f, 1.0f};
  GLfloat p[] = {0.0f, 0.0f, 0.0f, 1.0f};
  
  Lib3dsLight *l;


  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  if (!model) {
    return;
  }

  nodC=lib3ds_file_node_by_name(model, camera, LIB3DS_NODE_CAMERA);
  nodT=lib3ds_file_node_by_name(model, camera, LIB3DS_NODE_CAMERA_TARGET);
  
  if (!nodC || !nodT) {
    // 本测试程序要求必须存在 camera 和 target
    // 这里存在问题？以后的文章再处理不存在的情形
    assert(0 && "Camera or Target not found!");
    return;
  }

  camNode = (Lib3dsCameraNode*) nodC;
  tgtNode = (Lib3dsTargetNode*) nodT;

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective( camNode->fov, 1.0*gl_width/gl_height, 100.0, 20000.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glRotatef(-90, 1.0, 0,0);

  li=GL_LIGHT0;
    
  for (i=0; i<model->nlights; i++)
  {
    l = model->lights[i];
    glEnable(li);

    glLightfv(li, GL_AMBIENT, a);
    glLightfv(li, GL_DIFFUSE, c);
    glLightfv(li, GL_SPECULAR, c);  // p?

    p[0] = l->position[0];
    p[1] = l->position[1];
    p[2] = l->position[2];
    glLightfv(li, GL_POSITION, p);

    if (!l->spot_light) {
      continue;
    }

    p[0] = l->target[0] - l->position[0];
    p[1] = l->target[1] - l->position[1];
    p[2] = l->target[2] - l->position[2];      
    
    glLightfv(li, GL_SPOT_DIRECTION, p);
    
    ++li;
  }

  lib3ds_matrix_camera(M, camNode->pos, tgtNode->pos, camNode->roll);
    
  glMultMatrixf(&M[0][0]);

  for (nod=model->nodes; nod!=0; nod=nod->next) {
    render_node(nod);
  }
  
  if (!halt) {
    current_frame+=1.0;
    
    if (current_frame>model->frames) {
      current_frame=0;
    }

    lib3ds_file_eval（model, current_frame);

    glutSwapBuffers();
    glutPostRedisplay();
  }
}


static void init(void) 
{
  int    i;

  glClearColor(0.5, 0.5, 0.5, 1.0);
  glShadeModel(GL_SMOOTH);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glDisable(GL_LIGHT1);
  glDepthFunc(GL_LEQUAL);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_CULL_FACE);
  glCullFace(GL_BACK);
  //glDisable(GL_NORMALIZE);
  //glPolygonOffset(1.0, 2);

  model=lib3ds_file_open(filename);
  if (!model) {
    printf("***ERROR*** Loading 3DS file failed.");
    exit(1);
  }
  
  if (!model->cameras) {
    printf("***ERROR*** No Camera found.");
    lib3ds_file_free(model);
    model=0;
    exit(1);
  }
  
  if (!camera) {
    camera = model->cameras[0]->name;
  }

  camera_menu_id = glutCreateMenu(camera_menu);

  for (i=0; i<model->ncameras; i++){
    glutAddMenuEntry(model->cameras[i]->name, i);
  }

  glutAttachMenu(0);

  lib3ds_file_eval（model, 0);
}

static void reshape (int w, int h)
{
  gl_width=w;
  gl_height=h;
  glViewport(0,0,w,h);
}

static void keyboard(unsigned char key, int x, int y)
{
  switch (key) {
  case 27:
    exit(0);
    break;
  case 'h':
    halt=!halt;
    glutPostRedisplay();
    break;
  }
}

int main(int argc, char** argv)
{
  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
  glutInitWindowSize(640, 480); 
  glutInitWindowPosition(100, 100);
  glutCreateWindow(argv[0]);

  init();

  glutDisplayFunc(display); 
  glutReshapeFunc(reshape);
  glutKeyboardFunc(keyboard);
  glutMainLoop();

  /* Memory leaks detecting */
  _CrtDumpMemoryLeaks();

  return(0);
}

 

运行结果：

An example of lib3ds 2.0 with opengl32_matrix

 

例子中使用的3ds23文件来自于：

​​http://www.sharecg.com/​​

 

house.3ds

 

 

 

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