488 lines
12 KiB
C++
488 lines
12 KiB
C++
//
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// Simple .obj viewer(vertex only)
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//
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#include <vector>
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#include <string>
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#include <cstdio>
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#include <cstdlib>
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#include <iostream>
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#include <limits>
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#include <cmath>
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#include <cassert>
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#include <algorithm>
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#include <GL/glew.h>
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#ifdef __APPLE__
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#include <OpenGL/glu.h>
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#else
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#include <GL/glu.h>
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#endif
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#include <GLFW/glfw3.h>
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#include "trackball.h"
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#include "optimized-parse.cc"
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typedef struct {
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GLuint vb; // vertex buffer
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int numTriangles;
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} DrawObject;
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std::vector<DrawObject> gDrawObjects;
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int width = 768;
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int height = 768;
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double prevMouseX, prevMouseY;
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bool mouseLeftPressed;
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bool mouseMiddlePressed;
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bool mouseRightPressed;
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float curr_quat[4];
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float prev_quat[4];
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float eye[3], lookat[3], up[3];
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GLFWwindow* window;
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void CheckErrors(std::string desc) {
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GLenum e = glGetError();
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if (e != GL_NO_ERROR) {
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fprintf(stderr, "OpenGL error in \"%s\": %d (%d)\n", desc.c_str(), e, e);
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exit(20);
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}
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}
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void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
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float v10[3];
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v10[0] = v1[0] - v0[0];
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v10[1] = v1[1] - v0[1];
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v10[2] = v1[2] - v0[2];
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float v20[3];
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v20[0] = v2[0] - v0[0];
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v20[1] = v2[1] - v0[1];
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v20[2] = v2[2] - v0[2];
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N[0] = v20[1] * v10[2] - v20[2] * v10[1];
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N[1] = v20[2] * v10[0] - v20[0] * v10[2];
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N[2] = v20[0] * v10[1] - v20[1] * v10[0];
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float len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
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if (len2 > 0.0f) {
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float len = sqrtf(len2);
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N[0] /= len;
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N[1] /= len;
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}
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}
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const char *mmap_file(size_t *len, const char* filename)
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{
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#ifdef _WIN64
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HANDLE file = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
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assert(file != INVALID_HANDLE_VALUE);
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HANDLE fileMapping = CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL);
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assert(fileMapping != INVALID_HANDLE_VALUE);
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LPVOID fileMapView = MapViewOfFile(fileMapping, FILE_MAP_READ, 0, 0, 0);
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auto fileMapViewChar = (const char*)fileMapView;
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assert(fileMapView != NULL);
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#else
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FILE* f = fopen(filename, "r" );
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fseek(f, 0, SEEK_END);
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long fileSize = ftell(f);
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fclose(f);
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struct stat sb;
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char *p;
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int fd;
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fd = open (filename, O_RDONLY);
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if (fd == -1) {
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perror ("open");
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return NULL;
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}
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if (fstat (fd, &sb) == -1) {
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perror ("fstat");
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return NULL;
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}
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if (!S_ISREG (sb.st_mode)) {
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fprintf (stderr, "%s is not a file\n", "lineitem.tbl");
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return NULL;
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}
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p = (char*)mmap (0, fileSize, PROT_READ, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED) {
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perror ("mmap");
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return NULL;
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}
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if (close (fd) == -1) {
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perror ("close");
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return NULL;
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}
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return p;
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(*len) = fileSize;
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#endif
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}
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bool LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename)
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{
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std::vector<float> vertices;
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std::vector<float> normals;
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std::vector<float> texcoords;
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std::vector<vertex_index> faces;
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size_t data_len = 0;
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const char* data = nullptr;
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data = mmap_file(&data_len, filename);
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if (data == nullptr) {
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exit(-1);
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return false;
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}
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parse(vertices, normals, texcoords, faces, data, data_len, 1);
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bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
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bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
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{
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DrawObject o;
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std::vector<float> vb; // pos(3float), normal(3float), color(3float)
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for (size_t f = 0; f < faces.size()/3; f++) {
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vertex_index idx0 = faces[3*f+0];
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vertex_index idx1 = faces[3*f+1];
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vertex_index idx2 = faces[3*f+2];
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float v[3][3];
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for (int k = 0; k < 3; k++) {
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int f0 = idx0.v_idx;
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int f1 = idx1.v_idx;
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int f2 = idx2.v_idx;
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assert(f0 >= 0);
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assert(f1 >= 0);
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assert(f2 >= 0);
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v[0][k] = vertices[3*f0+k];
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v[1][k] = vertices[3*f1+k];
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v[2][k] = vertices[3*f2+k];
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bmin[k] = std::min(v[0][k], bmin[k]);
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bmin[k] = std::min(v[1][k], bmin[k]);
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bmin[k] = std::min(v[2][k], bmin[k]);
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bmax[k] = std::max(v[0][k], bmax[k]);
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bmax[k] = std::max(v[1][k], bmax[k]);
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bmax[k] = std::max(v[2][k], bmax[k]);
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}
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float n[3][3];
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if (normals.size() > 0) {
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int f0 = idx0.vn_idx;
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int f1 = idx1.vn_idx;
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int f2 = idx2.vn_idx;
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assert(f0 >= 0);
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assert(f1 >= 0);
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assert(f2 >= 0);
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for (int k = 0; k < 3; k++) {
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n[0][k] = normals[3*f0+k];
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n[1][k] = normals[3*f1+k];
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n[2][k] = normals[3*f2+k];
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}
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} else {
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// compute geometric normal
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CalcNormal(n[0], v[0], v[1], v[2]);
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n[1][0] = n[0][0]; n[1][1] = n[0][1]; n[1][2] = n[0][2];
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n[2][0] = n[0][0]; n[2][1] = n[0][1]; n[2][2] = n[0][2];
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}
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for (int k = 0; k < 3; k++) {
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vb.push_back(v[k][0]);
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vb.push_back(v[k][1]);
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vb.push_back(v[k][2]);
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vb.push_back(n[k][0]);
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vb.push_back(n[k][1]);
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vb.push_back(n[k][2]);
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// Use normal as color.
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float c[3] = {n[k][0], n[k][1], n[k][2]};
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float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
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if (len2 > 0.0f) {
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float len = sqrtf(len2);
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c[0] /= len;
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c[1] /= len;
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c[2] /= len;
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}
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vb.push_back(c[0] * 0.5 + 0.5);
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vb.push_back(c[1] * 0.5 + 0.5);
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vb.push_back(c[2] * 0.5 + 0.5);
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}
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}
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o.vb = 0;
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o.numTriangles = 0;
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if (vb.size() > 0) {
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glGenBuffers(1, &o.vb);
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glBindBuffer(GL_ARRAY_BUFFER, o.vb);
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glBufferData(GL_ARRAY_BUFFER, vb.size() * sizeof(float), &vb.at(0), GL_STATIC_DRAW);
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o.numTriangles = vb.size() / 9 / 3;
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}
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gDrawObjects.push_back(o);
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}
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printf("bmin = %f, %f, %f\n", bmin[0], bmin[1], bmin[2]);
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printf("bmax = %f, %f, %f\n", bmax[0], bmax[1], bmax[2]);
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return true;
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}
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void reshapeFunc(GLFWwindow* window, int w, int h)
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{
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(void)window;
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printf("reshape\n");
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0, (float)w / (float)h, 0.01f, 100.0f);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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width = w;
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height = h;
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}
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void keyboardFunc(GLFWwindow *window, int key, int scancode, int action, int mods) {
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(void)window;
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(void)scancode;
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(void)mods;
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if(action == GLFW_PRESS || action == GLFW_REPEAT){
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// Move camera
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float mv_x = 0, mv_y = 0, mv_z = 0;
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if(key == GLFW_KEY_K) mv_x += 1;
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else if(key == GLFW_KEY_J) mv_x += -1;
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else if(key == GLFW_KEY_L) mv_y += 1;
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else if(key == GLFW_KEY_H) mv_y += -1;
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else if(key == GLFW_KEY_P) mv_z += 1;
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else if(key == GLFW_KEY_N) mv_z += -1;
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//camera.move(mv_x * 0.05, mv_y * 0.05, mv_z * 0.05);
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// Close window
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if(key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE) glfwSetWindowShouldClose(window, GL_TRUE);
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//init_frame = true;
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}
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}
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void clickFunc(GLFWwindow* window, int button, int action, int mods){
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(void)window;
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(void)mods;
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if(button == GLFW_MOUSE_BUTTON_LEFT){
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if(action == GLFW_PRESS){
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mouseLeftPressed = true;
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trackball(prev_quat, 0.0, 0.0, 0.0, 0.0);
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} else if(action == GLFW_RELEASE){
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mouseLeftPressed = false;
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}
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}
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if(button == GLFW_MOUSE_BUTTON_RIGHT){
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if(action == GLFW_PRESS){
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mouseRightPressed = true;
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} else if(action == GLFW_RELEASE){
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mouseRightPressed = false;
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}
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}
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if(button == GLFW_MOUSE_BUTTON_MIDDLE){
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if(action == GLFW_PRESS){
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mouseMiddlePressed = true;
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} else if(action == GLFW_RELEASE){
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mouseMiddlePressed = false;
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}
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}
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}
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void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y){
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(void)window;
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float rotScale = 1.0f;
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float transScale = 2.0f;
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if(mouseLeftPressed){
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trackball(prev_quat,
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rotScale * (2.0f * prevMouseX - width) / (float)width,
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rotScale * (height - 2.0f * prevMouseY) / (float)height,
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rotScale * (2.0f * mouse_x - width) / (float)width,
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rotScale * (height - 2.0f * mouse_y) / (float)height);
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add_quats(prev_quat, curr_quat, curr_quat);
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} else if (mouseMiddlePressed) {
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eye[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
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lookat[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
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eye[1] += transScale * (mouse_y - prevMouseY) / (float)height;
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lookat[1] += transScale * (mouse_y - prevMouseY) / (float)height;
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} else if (mouseRightPressed) {
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eye[2] += transScale * (mouse_y - prevMouseY) / (float)height;
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lookat[2] += transScale * (mouse_y - prevMouseY) / (float)height;
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}
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// Update mouse point
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prevMouseX = mouse_x;
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prevMouseY = mouse_y;
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}
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void Draw(const std::vector<DrawObject>& drawObjects)
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{
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glPolygonMode(GL_FRONT, GL_FILL);
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glPolygonMode(GL_BACK, GL_FILL);
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glEnable(GL_POLYGON_OFFSET_FILL);
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glPolygonOffset(1.0, 1.0);
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glColor3f(1.0f, 1.0f, 1.0f);
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for (size_t i = 0; i < drawObjects.size(); i++) {
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DrawObject o = drawObjects[i];
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if (o.vb < 1) {
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continue;
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}
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glBindBuffer(GL_ARRAY_BUFFER, o.vb);
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_NORMAL_ARRAY);
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glEnableClientState(GL_COLOR_ARRAY);
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glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
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glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
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glColorPointer(3, GL_FLOAT, 36, (const void*)(sizeof(float)*6));
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glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
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CheckErrors("drawarrays");
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}
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// draw wireframe
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glDisable(GL_POLYGON_OFFSET_FILL);
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glPolygonMode(GL_FRONT, GL_LINE);
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glPolygonMode(GL_BACK, GL_LINE);
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glColor3f(0.0f, 0.0f, 0.4f);
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for (size_t i = 0; i < drawObjects.size(); i++) {
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DrawObject o = drawObjects[i];
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if (o.vb < 1) {
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continue;
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}
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glBindBuffer(GL_ARRAY_BUFFER, o.vb);
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_NORMAL_ARRAY);
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glDisableClientState(GL_COLOR_ARRAY);
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glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
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glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
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glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
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CheckErrors("drawarrays");
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}
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}
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static void Init() {
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trackball(curr_quat, 0, 0, 0, 0);
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eye[0] = 0.0f;
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eye[1] = 0.0f;
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eye[2] = 3.0f;
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lookat[0] = 0.0f;
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lookat[1] = 0.0f;
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lookat[2] = 0.0f;
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up[0] = 0.0f;
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up[1] = 1.0f;
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up[2] = 0.0f;
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}
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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std::cout << "Needs input.obj\n" << std::endl;
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return 0;
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}
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Init();
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if(!glfwInit()){
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std::cerr << "Failed to initialize GLFW." << std::endl;
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return -1;
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}
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window = glfwCreateWindow(width, height, "Obj viewer", NULL, NULL);
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if(window == NULL){
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std::cerr << "Failed to open GLFW window. " << std::endl;
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glfwTerminate();
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return 1;
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}
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glfwMakeContextCurrent(window);
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glfwSwapInterval(1);
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// Callback
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glfwSetWindowSizeCallback(window, reshapeFunc);
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glfwSetKeyCallback(window, keyboardFunc);
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glfwSetMouseButtonCallback(window, clickFunc);
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glfwSetCursorPosCallback(window, motionFunc);
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glewExperimental = true;
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if (glewInit() != GLEW_OK) {
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std::cerr << "Failed to initialize GLEW." << std::endl;
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return -1;
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}
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reshapeFunc(window, width, height);
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float bmin[3], bmax[3];
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if (false == LoadObjAndConvert(bmin, bmax, argv[1])) {
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return -1;
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}
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float maxExtent = 0.5f * (bmax[0] - bmin[0]);
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if (maxExtent < 0.5f * (bmax[1] - bmin[1])) {
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maxExtent = 0.5f * (bmax[1] - bmin[1]);
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}
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if (maxExtent < 0.5f * (bmax[2] - bmin[2])) {
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maxExtent = 0.5f * (bmax[2] - bmin[2]);
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}
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while(glfwWindowShouldClose(window) == GL_FALSE) {
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glfwPollEvents();
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glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_DEPTH_TEST);
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// camera & rotate
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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GLfloat mat[4][4];
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gluLookAt(eye[0], eye[1], eye[2], lookat[0], lookat[1], lookat[2], up[0], up[1], up[2]);
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build_rotmatrix(mat, curr_quat);
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glMultMatrixf(&mat[0][0]);
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// Fit to -1, 1
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glScalef(1.0f / maxExtent, 1.0f / maxExtent, 1.0f / maxExtent);
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// Centerize object.
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glTranslatef(-0.5*(bmax[0] + bmin[0]), -0.5*(bmax[1] + bmin[1]), -0.5*(bmax[2] + bmin[2]));
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Draw(gDrawObjects);
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glfwSwapBuffers(window);
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}
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glfwTerminate();
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}
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