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viewer.cc
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//
// Simple .obj viewer(vertex only)
//
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <limits>
#include <map>
#include <string>
#include <vector>
#include <GL/glew.h>
#ifdef __APPLE__
#include <OpenGL/glu.h>
#else
#include <GL/glu.h>
#endif
#include <GLFW/glfw3.h>
#define TINYOBJLOADER_IMPLEMENTATION
// TINYOBJLOADER_USE_MAPBOX_EARCUT: Enable better triangulation. Requires C++11
//#define TINYOBJLOADER_USE_MAPBOX_EARCUT
#include "../../tiny_obj_loader.h"
#include "trackball.h"
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Weverything"
#endif
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#ifdef _WIN32
#ifdef __cplusplus
extern "C" {
#endif
#include <windows.h>
#ifdef max
#undef max
#endif
#ifdef min
#undef min
#endif
#include <mmsystem.h>
#ifdef __cplusplus
}
#endif
#pragma comment(lib, "winmm.lib")
#else
#if defined(__unix__) || defined(__APPLE__)
#include <sys/time.h>
#else
#include <ctime>
#endif
#endif
class timerutil {
public:
#ifdef _WIN32
typedef DWORD time_t;
timerutil() { ::timeBeginPeriod(1); }
~timerutil() { ::timeEndPeriod(1); }
void start() { t_[0] = ::timeGetTime(); }
void end() { t_[1] = ::timeGetTime(); }
time_t sec() { return (time_t)((t_[1] - t_[0]) / 1000); }
time_t msec() { return (time_t)((t_[1] - t_[0])); }
time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000); }
time_t current() { return ::timeGetTime(); }
#else
#if defined(__unix__) || defined(__APPLE__)
typedef unsigned long int time_t;
void start() { gettimeofday(tv + 0, &tz); }
void end() { gettimeofday(tv + 1, &tz); }
time_t sec() { return (time_t)(tv[1].tv_sec - tv[0].tv_sec); }
time_t msec() {
return this->sec() * 1000 +
(time_t)((tv[1].tv_usec - tv[0].tv_usec) / 1000);
}
time_t usec() {
return this->sec() * 1000000 + (time_t)(tv[1].tv_usec - tv[0].tv_usec);
}
time_t current() {
struct timeval t;
gettimeofday(&t, NULL);
return (time_t)(t.tv_sec * 1000 + t.tv_usec);
}
#else // C timer
// using namespace std;
typedef clock_t time_t;
void start() { t_[0] = clock(); }
void end() { t_[1] = clock(); }
time_t sec() { return (time_t)((t_[1] - t_[0]) / CLOCKS_PER_SEC); }
time_t msec() { return (time_t)((t_[1] - t_[0]) * 1000 / CLOCKS_PER_SEC); }
time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000000 / CLOCKS_PER_SEC); }
time_t current() { return (time_t)clock(); }
#endif
#endif
private:
#ifdef _WIN32
DWORD t_[2];
#else
#if defined(__unix__) || defined(__APPLE__)
struct timeval tv[2];
struct timezone tz;
#else
time_t t_[2];
#endif
#endif
};
typedef struct {
GLuint vb_id; // vertex buffer id
int numTriangles;
size_t material_id;
} DrawObject;
std::vector<DrawObject> gDrawObjects;
int width = 768;
int height = 768;
double prevMouseX, prevMouseY;
bool mouseLeftPressed;
bool mouseMiddlePressed;
bool mouseRightPressed;
float curr_quat[4];
float prev_quat[4];
float eye[3], lookat[3], up[3];
GLFWwindow* window;
static std::string GetBaseDir(const std::string& filepath) {
if (filepath.find_last_of("/\\") != std::string::npos)
return filepath.substr(0, filepath.find_last_of("/\\"));
return "";
}
static bool FileExists(const std::string& abs_filename) {
bool ret;
FILE* fp = fopen(abs_filename.c_str(), "rb");
if (fp) {
ret = true;
fclose(fp);
} else {
ret = false;
}
return ret;
}
static void CheckErrors(std::string desc) {
GLenum e = glGetError();
if (e != GL_NO_ERROR) {
fprintf(stderr, "OpenGL error in \"%s\": %d (%d)\n", desc.c_str(), e, e);
exit(20);
}
}
static void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
float v10[3];
v10[0] = v1[0] - v0[0];
v10[1] = v1[1] - v0[1];
v10[2] = v1[2] - v0[2];
float v20[3];
v20[0] = v2[0] - v0[0];
v20[1] = v2[1] - v0[1];
v20[2] = v2[2] - v0[2];
N[0] = v10[1] * v20[2] - v10[2] * v20[1];
N[1] = v10[2] * v20[0] - v10[0] * v20[2];
N[2] = v10[0] * v20[1] - v10[1] * v20[0];
float len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
if (len2 > 0.0f) {
float len = sqrtf(len2);
N[0] /= len;
N[1] /= len;
N[2] /= len;
}
}
namespace // Local utility functions
{
struct vec3 {
float v[3];
vec3() {
v[0] = 0.0f;
v[1] = 0.0f;
v[2] = 0.0f;
}
};
void normalizeVector(vec3 &v) {
float len2 = v.v[0] * v.v[0] + v.v[1] * v.v[1] + v.v[2] * v.v[2];
if (len2 > 0.0f) {
float len = sqrtf(len2);
v.v[0] /= len;
v.v[1] /= len;
v.v[2] /= len;
}
}
// Check if `mesh_t` contains smoothing group id.
bool hasSmoothingGroup(const tinyobj::shape_t& shape)
{
for (size_t i = 0; i < shape.mesh.smoothing_group_ids.size(); i++) {
if (shape.mesh.smoothing_group_ids[i] > 0) {
return true;
}
}
return false;
}
void computeSmoothingNormals(const tinyobj::attrib_t& attrib, const tinyobj::shape_t& shape,
std::map<int, vec3>& smoothVertexNormals) {
smoothVertexNormals.clear();
std::map<int, vec3>::iterator iter;
for (size_t f = 0; f < shape.mesh.indices.size() / 3; f++) {
// Get the three indexes of the face (all faces are triangular)
tinyobj::index_t idx0 = shape.mesh.indices[3 * f + 0];
tinyobj::index_t idx1 = shape.mesh.indices[3 * f + 1];
tinyobj::index_t idx2 = shape.mesh.indices[3 * f + 2];
// Get the three vertex indexes and coordinates
int vi[3]; // indexes
float v[3][3]; // coordinates
for (int k = 0; k < 3; k++) {
vi[0] = idx0.vertex_index;
vi[1] = idx1.vertex_index;
vi[2] = idx2.vertex_index;
assert(vi[0] >= 0);
assert(vi[1] >= 0);
assert(vi[2] >= 0);
v[0][k] = attrib.vertices[3 * vi[0] + k];
v[1][k] = attrib.vertices[3 * vi[1] + k];
v[2][k] = attrib.vertices[3 * vi[2] + k];
}
// Compute the normal of the face
float normal[3];
CalcNormal(normal, v[0], v[1], v[2]);
// Add the normal to the three vertexes
for (size_t i = 0; i < 3; ++i) {
iter = smoothVertexNormals.find(vi[i]);
if (iter != smoothVertexNormals.end()) {
// add
iter->second.v[0] += normal[0];
iter->second.v[1] += normal[1];
iter->second.v[2] += normal[2];
} else {
smoothVertexNormals[vi[i]].v[0] = normal[0];
smoothVertexNormals[vi[i]].v[1] = normal[1];
smoothVertexNormals[vi[i]].v[2] = normal[2];
}
}
} // f
// Normalize the normals, that is, make them unit vectors
for (iter = smoothVertexNormals.begin(); iter != smoothVertexNormals.end();
iter++) {
normalizeVector(iter->second);
}
} // computeSmoothingNormals
} // namespace
static bool LoadObjAndConvert(float bmin[3], float bmax[3],
std::vector<DrawObject>* drawObjects,
std::vector<tinyobj::material_t>& materials,
std::map<std::string, GLuint>& textures,
const char* filename) {
tinyobj::attrib_t attrib;
std::vector<tinyobj::shape_t> shapes;
timerutil tm;
tm.start();
std::string base_dir = GetBaseDir(filename);
if (base_dir.empty()) {
base_dir = ".";
}
#ifdef _WIN32
base_dir += "\\";
#else
base_dir += "/";
#endif
std::string warn;
std::string err;
bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename,
base_dir.c_str());
if (!warn.empty()) {
std::cout << "WARN: " << warn << std::endl;
}
if (!err.empty()) {
std::cerr << err << std::endl;
}
tm.end();
if (!ret) {
std::cerr << "Failed to load " << filename << std::endl;
return false;
}
printf("Parsing time: %d [ms]\n", (int)tm.msec());
printf("# of vertices = %d\n", (int)(attrib.vertices.size()) / 3);
printf("# of normals = %d\n", (int)(attrib.normals.size()) / 3);
printf("# of texcoords = %d\n", (int)(attrib.texcoords.size()) / 2);
printf("# of materials = %d\n", (int)materials.size());
printf("# of shapes = %d\n", (int)shapes.size());
// Append `default` material
materials.push_back(tinyobj::material_t());
for (size_t i = 0; i < materials.size(); i++) {
printf("material[%d].diffuse_texname = %s\n", int(i),
materials[i].diffuse_texname.c_str());
}
// Load diffuse textures
{
for (size_t m = 0; m < materials.size(); m++) {
tinyobj::material_t* mp = &materials[m];
if (mp->diffuse_texname.length() > 0) {
// Only load the texture if it is not already loaded
if (textures.find(mp->diffuse_texname) == textures.end()) {
GLuint texture_id;
int w, h;
int comp;
std::string texture_filename = mp->diffuse_texname;
if (!FileExists(texture_filename)) {
// Append base dir.
texture_filename = base_dir + mp->diffuse_texname;
if (!FileExists(texture_filename)) {
std::cerr << "Unable to find file: " << mp->diffuse_texname
<< std::endl;
exit(1);
}
}
unsigned char* image =
stbi_load(texture_filename.c_str(), &w, &h, &comp, STBI_default);
if (!image) {
std::cerr << "Unable to load texture: " << texture_filename
<< std::endl;
exit(1);
}
std::cout << "Loaded texture: " << texture_filename << ", w = " << w
<< ", h = " << h << ", comp = " << comp << std::endl;
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (comp == 3) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB,
GL_UNSIGNED_BYTE, image);
} else if (comp == 4) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA,
GL_UNSIGNED_BYTE, image);
} else {
assert(0); // TODO
}
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(image);
textures.insert(std::make_pair(mp->diffuse_texname, texture_id));
}
}
}
}
bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
{
for (size_t s = 0; s < shapes.size(); s++) {
DrawObject o;
std::vector<float> buffer; // pos(3float), normal(3float), color(3float)
// Check for smoothing group and compute smoothing normals
std::map<int, vec3> smoothVertexNormals;
if (hasSmoothingGroup(shapes[s]) > 0) {
std::cout << "Compute smoothingNormal for shape [" << s << "]" << std::endl;
computeSmoothingNormals(attrib, shapes[s], smoothVertexNormals);
}
for (size_t f = 0; f < shapes[s].mesh.indices.size() / 3; f++) {
tinyobj::index_t idx0 = shapes[s].mesh.indices[3 * f + 0];
tinyobj::index_t idx1 = shapes[s].mesh.indices[3 * f + 1];
tinyobj::index_t idx2 = shapes[s].mesh.indices[3 * f + 2];
int current_material_id = shapes[s].mesh.material_ids[f];
if ((current_material_id < 0) ||
(current_material_id >= static_cast<int>(materials.size()))) {
// Invaid material ID. Use default material.
current_material_id =
materials.size() -
1; // Default material is added to the last item in `materials`.
}
// if (current_material_id >= materials.size()) {
// std::cerr << "Invalid material index: " << current_material_id <<
// std::endl;
//}
//
float diffuse[3];
for (size_t i = 0; i < 3; i++) {
diffuse[i] = materials[current_material_id].diffuse[i];
}
float tc[3][2];
if (attrib.texcoords.size() > 0) {
if ((idx0.texcoord_index < 0) || (idx1.texcoord_index < 0) ||
(idx2.texcoord_index < 0)) {
// face does not contain valid uv index.
tc[0][0] = 0.0f;
tc[0][1] = 0.0f;
tc[1][0] = 0.0f;
tc[1][1] = 0.0f;
tc[2][0] = 0.0f;
tc[2][1] = 0.0f;
} else {
assert(attrib.texcoords.size() >
size_t(2 * idx0.texcoord_index + 1));
assert(attrib.texcoords.size() >
size_t(2 * idx1.texcoord_index + 1));
assert(attrib.texcoords.size() >
size_t(2 * idx2.texcoord_index + 1));
// Flip Y coord.
tc[0][0] = attrib.texcoords[2 * idx0.texcoord_index];
tc[0][1] = 1.0f - attrib.texcoords[2 * idx0.texcoord_index + 1];
tc[1][0] = attrib.texcoords[2 * idx1.texcoord_index];
tc[1][1] = 1.0f - attrib.texcoords[2 * idx1.texcoord_index + 1];
tc[2][0] = attrib.texcoords[2 * idx2.texcoord_index];
tc[2][1] = 1.0f - attrib.texcoords[2 * idx2.texcoord_index + 1];
}
} else {
tc[0][0] = 0.0f;
tc[0][1] = 0.0f;
tc[1][0] = 0.0f;
tc[1][1] = 0.0f;
tc[2][0] = 0.0f;
tc[2][1] = 0.0f;
}
float v[3][3];
for (int k = 0; k < 3; k++) {
int f0 = idx0.vertex_index;
int f1 = idx1.vertex_index;
int f2 = idx2.vertex_index;
assert(f0 >= 0);
assert(f1 >= 0);
assert(f2 >= 0);
v[0][k] = attrib.vertices[3 * f0 + k];
v[1][k] = attrib.vertices[3 * f1 + k];
v[2][k] = attrib.vertices[3 * f2 + k];
bmin[k] = std::min(v[0][k], bmin[k]);
bmin[k] = std::min(v[1][k], bmin[k]);
bmin[k] = std::min(v[2][k], bmin[k]);
bmax[k] = std::max(v[0][k], bmax[k]);
bmax[k] = std::max(v[1][k], bmax[k]);
bmax[k] = std::max(v[2][k], bmax[k]);
}
float n[3][3];
{
bool invalid_normal_index = false;
if (attrib.normals.size() > 0) {
int nf0 = idx0.normal_index;
int nf1 = idx1.normal_index;
int nf2 = idx2.normal_index;
if ((nf0 < 0) || (nf1 < 0) || (nf2 < 0)) {
// normal index is missing from this face.
invalid_normal_index = true;
} else {
for (int k = 0; k < 3; k++) {
assert(size_t(3 * nf0 + k) < attrib.normals.size());
assert(size_t(3 * nf1 + k) < attrib.normals.size());
assert(size_t(3 * nf2 + k) < attrib.normals.size());
n[0][k] = attrib.normals[3 * nf0 + k];
n[1][k] = attrib.normals[3 * nf1 + k];
n[2][k] = attrib.normals[3 * nf2 + k];
}
}
} else {
invalid_normal_index = true;
}
if (invalid_normal_index && !smoothVertexNormals.empty()) {
// Use smoothing normals
int f0 = idx0.vertex_index;
int f1 = idx1.vertex_index;
int f2 = idx2.vertex_index;
if (f0 >= 0 && f1 >= 0 && f2 >= 0) {
n[0][0] = smoothVertexNormals[f0].v[0];
n[0][1] = smoothVertexNormals[f0].v[1];
n[0][2] = smoothVertexNormals[f0].v[2];
n[1][0] = smoothVertexNormals[f1].v[0];
n[1][1] = smoothVertexNormals[f1].v[1];
n[1][2] = smoothVertexNormals[f1].v[2];
n[2][0] = smoothVertexNormals[f2].v[0];
n[2][1] = smoothVertexNormals[f2].v[1];
n[2][2] = smoothVertexNormals[f2].v[2];
invalid_normal_index = false;
}
}
if (invalid_normal_index) {
// compute geometric normal
CalcNormal(n[0], v[0], v[1], v[2]);
n[1][0] = n[0][0];
n[1][1] = n[0][1];
n[1][2] = n[0][2];
n[2][0] = n[0][0];
n[2][1] = n[0][1];
n[2][2] = n[0][2];
}
}
for (int k = 0; k < 3; k++) {
buffer.push_back(v[k][0]);
buffer.push_back(v[k][1]);
buffer.push_back(v[k][2]);
buffer.push_back(n[k][0]);
buffer.push_back(n[k][1]);
buffer.push_back(n[k][2]);
// Combine normal and diffuse to get color.
float normal_factor = 0.2;
float diffuse_factor = 1 - normal_factor;
float c[3] = {n[k][0] * normal_factor + diffuse[0] * diffuse_factor,
n[k][1] * normal_factor + diffuse[1] * diffuse_factor,
n[k][2] * normal_factor + diffuse[2] * diffuse_factor};
float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
if (len2 > 0.0f) {
float len = sqrtf(len2);
c[0] /= len;
c[1] /= len;
c[2] /= len;
}
buffer.push_back(c[0] * 0.5 + 0.5);
buffer.push_back(c[1] * 0.5 + 0.5);
buffer.push_back(c[2] * 0.5 + 0.5);
buffer.push_back(tc[k][0]);
buffer.push_back(tc[k][1]);
}
}
o.vb_id = 0;
o.numTriangles = 0;
// OpenGL viewer does not support texturing with per-face material.
if (shapes[s].mesh.material_ids.size() > 0 &&
shapes[s].mesh.material_ids.size() > s) {
o.material_id = shapes[s].mesh.material_ids[0]; // use the material ID
// of the first face.
} else {
o.material_id = materials.size() - 1; // = ID for default material.
}
printf("shape[%d] material_id %d\n", int(s), int(o.material_id));
if (buffer.size() > 0) {
glGenBuffers(1, &o.vb_id);
glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
glBufferData(GL_ARRAY_BUFFER, buffer.size() * sizeof(float),
&buffer.at(0), GL_STATIC_DRAW);
o.numTriangles = buffer.size() / (3 + 3 + 3 + 2) /
3; // 3:vtx, 3:normal, 3:col, 2:texcoord
printf("shape[%d] # of triangles = %d\n", static_cast<int>(s),
o.numTriangles);
}
drawObjects->push_back(o);
}
}
printf("bmin = %f, %f, %f\n", bmin[0], bmin[1], bmin[2]);
printf("bmax = %f, %f, %f\n", bmax[0], bmax[1], bmax[2]);
return true;
}
static void reshapeFunc(GLFWwindow* window, int w, int h) {
int fb_w, fb_h;
// Get actual framebuffer size.
glfwGetFramebufferSize(window, &fb_w, &fb_h);
glViewport(0, 0, fb_w, fb_h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (float)w / (float)h, 0.01f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
width = w;
height = h;
}
static void keyboardFunc(GLFWwindow* window, int key, int scancode, int action,
int mods) {
(void)window;
(void)scancode;
(void)mods;
if (action == GLFW_PRESS || action == GLFW_REPEAT) {
// Move camera
float mv_x = 0, mv_y = 0, mv_z = 0;
if (key == GLFW_KEY_K)
mv_x += 1;
else if (key == GLFW_KEY_J)
mv_x += -1;
else if (key == GLFW_KEY_L)
mv_y += 1;
else if (key == GLFW_KEY_H)
mv_y += -1;
else if (key == GLFW_KEY_P)
mv_z += 1;
else if (key == GLFW_KEY_N)
mv_z += -1;
// camera.move(mv_x * 0.05, mv_y * 0.05, mv_z * 0.05);
// Close window
if (key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE)
glfwSetWindowShouldClose(window, GL_TRUE);
// init_frame = true;
}
}
static void clickFunc(GLFWwindow* window, int button, int action, int mods) {
(void)window;
(void)mods;
if (button == GLFW_MOUSE_BUTTON_LEFT) {
if (action == GLFW_PRESS) {
mouseLeftPressed = true;
trackball(prev_quat, 0.0, 0.0, 0.0, 0.0);
} else if (action == GLFW_RELEASE) {
mouseLeftPressed = false;
}
}
if (button == GLFW_MOUSE_BUTTON_RIGHT) {
if (action == GLFW_PRESS) {
mouseRightPressed = true;
} else if (action == GLFW_RELEASE) {
mouseRightPressed = false;
}
}
if (button == GLFW_MOUSE_BUTTON_MIDDLE) {
if (action == GLFW_PRESS) {
mouseMiddlePressed = true;
} else if (action == GLFW_RELEASE) {
mouseMiddlePressed = false;
}
}
}
static void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y) {
(void)window;
float rotScale = 1.0f;
float transScale = 2.0f;
if (mouseLeftPressed) {
trackball(prev_quat, rotScale * (2.0f * prevMouseX - width) / (float)width,
rotScale * (height - 2.0f * prevMouseY) / (float)height,
rotScale * (2.0f * mouse_x - width) / (float)width,
rotScale * (height - 2.0f * mouse_y) / (float)height);
add_quats(prev_quat, curr_quat, curr_quat);
} else if (mouseMiddlePressed) {
eye[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
lookat[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
eye[1] += transScale * (mouse_y - prevMouseY) / (float)height;
lookat[1] += transScale * (mouse_y - prevMouseY) / (float)height;
} else if (mouseRightPressed) {
eye[2] += transScale * (mouse_y - prevMouseY) / (float)height;
lookat[2] += transScale * (mouse_y - prevMouseY) / (float)height;
}
// Update mouse point
prevMouseX = mouse_x;
prevMouseY = mouse_y;
}
static void Draw(const std::vector<DrawObject>& drawObjects,
std::vector<tinyobj::material_t>& materials,
std::map<std::string, GLuint>& textures) {
glPolygonMode(GL_FRONT, GL_FILL);
glPolygonMode(GL_BACK, GL_FILL);
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 1.0);
GLsizei stride = (3 + 3 + 3 + 2) * sizeof(float);
for (size_t i = 0; i < drawObjects.size(); i++) {
DrawObject o = drawObjects[i];
if (o.vb_id < 1) {
continue;
}
glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindTexture(GL_TEXTURE_2D, 0);
if ((o.material_id < materials.size())) {
std::string diffuse_texname = materials[o.material_id].diffuse_texname;
if (textures.find(diffuse_texname) != textures.end()) {
glBindTexture(GL_TEXTURE_2D, textures[diffuse_texname]);
}
}
glVertexPointer(3, GL_FLOAT, stride, (const void*)0);
glNormalPointer(GL_FLOAT, stride, (const void*)(sizeof(float) * 3));
glColorPointer(3, GL_FLOAT, stride, (const void*)(sizeof(float) * 6));
glTexCoordPointer(2, GL_FLOAT, stride, (const void*)(sizeof(float) * 9));
glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
CheckErrors("drawarrays");
glBindTexture(GL_TEXTURE_2D, 0);
}
// draw wireframe
glDisable(GL_POLYGON_OFFSET_FILL);
glPolygonMode(GL_FRONT, GL_LINE);
glPolygonMode(GL_BACK, GL_LINE);
glColor3f(0.0f, 0.0f, 0.4f);
for (size_t i = 0; i < drawObjects.size(); i++) {
DrawObject o = drawObjects[i];
if (o.vb_id < 1) {
continue;
}
glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer(3, GL_FLOAT, stride, (const void*)0);
glNormalPointer(GL_FLOAT, stride, (const void*)(sizeof(float) * 3));
glColorPointer(3, GL_FLOAT, stride, (const void*)(sizeof(float) * 6));
glTexCoordPointer(2, GL_FLOAT, stride, (const void*)(sizeof(float) * 9));
glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
CheckErrors("drawarrays");
}
}
static void Init() {
trackball(curr_quat, 0, 0, 0, 0);
eye[0] = 0.0f;
eye[1] = 0.0f;
eye[2] = 3.0f;
lookat[0] = 0.0f;
lookat[1] = 0.0f;
lookat[2] = 0.0f;
up[0] = 0.0f;
up[1] = 1.0f;
up[2] = 0.0f;
}
int main(int argc, char** argv) {
if (argc < 2) {
std::cout << "Needs input.obj\n" << std::endl;
return 0;
}
Init();
if (!glfwInit()) {
std::cerr << "Failed to initialize GLFW." << std::endl;
return -1;
}
window = glfwCreateWindow(width, height, "Obj viewer", NULL, NULL);
if (window == NULL) {
std::cerr << "Failed to open GLFW window. " << std::endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
// Callback
glfwSetWindowSizeCallback(window, reshapeFunc);
glfwSetKeyCallback(window, keyboardFunc);
glfwSetMouseButtonCallback(window, clickFunc);
glfwSetCursorPosCallback(window, motionFunc);
glewExperimental = true;
if (glewInit() != GLEW_OK) {
std::cerr << "Failed to initialize GLEW." << std::endl;
return -1;
}
reshapeFunc(window, width, height);
float bmin[3], bmax[3];
std::vector<tinyobj::material_t> materials;
std::map<std::string, GLuint> textures;
if (false == LoadObjAndConvert(bmin, bmax, &gDrawObjects, materials, textures,
argv[1])) {
return -1;
}
float maxExtent = 0.5f * (bmax[0] - bmin[0]);
if (maxExtent < 0.5f * (bmax[1] - bmin[1])) {
maxExtent = 0.5f * (bmax[1] - bmin[1]);
}
if (maxExtent < 0.5f * (bmax[2] - bmin[2])) {
maxExtent = 0.5f * (bmax[2] - bmin[2]);
}
while (glfwWindowShouldClose(window) == GL_FALSE) {
glfwPollEvents();
glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
// camera & rotate
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
GLfloat mat[4][4];
gluLookAt(eye[0], eye[1], eye[2], lookat[0], lookat[1], lookat[2], up[0],
up[1], up[2]);
build_rotmatrix(mat, curr_quat);
glMultMatrixf(&mat[0][0]);
// Fit to -1, 1
glScalef(1.0f / maxExtent, 1.0f / maxExtent, 1.0f / maxExtent);
// Centerize object.
glTranslatef(-0.5 * (bmax[0] + bmin[0]), -0.5 * (bmax[1] + bmin[1]),
-0.5 * (bmax[2] + bmin[2]));
Draw(gDrawObjects, materials, textures);
glfwSwapBuffers(window);
}
glfwTerminate();
}