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viewer.c
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#define TINYOBJ_LOADER_C_IMPLEMENTATION
#include "../../tinyobj_loader_c.h"
#include "glad.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#ifdef _WIN64
#define atoll(S) _atoi64(S)
#include <windows.h>
#else
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <unistd.h>
#endif
#ifdef __APPLE__
#include <OpenGL/glu.h>
#else
#include <GL/glu.h>
#endif
#include <GLFW/glfw3.h>
#include "trackball.h"
typedef struct {
GLuint vb;
int numTriangles;
} DrawObject;
static DrawObject gDrawObject;
static int width = 768;
static int height = 768;
static float prevMouseX, prevMouseY;
static int mouseLeftPressed;
static int mouseMiddlePressed;
static int mouseRightPressed;
static float curr_quat[4];
static float prev_quat[4];
static float eye[3], lookat[3], up[3];
static GLFWwindow* gWindow;
static void CheckErrors(const char* desc) {
GLenum e = glGetError();
if (e != GL_NO_ERROR) {
fprintf(stderr, "OpenGL error in \"%s\": %d (%d)\n", desc, e, e);
exit(20);
}
}
static void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
float v10[3];
float v20[3];
float len2;
v10[0] = v1[0] - v0[0];
v10[1] = v1[1] - v0[1];
v10[2] = v1[2] - v0[2];
v20[0] = v2[0] - v0[0];
v20[1] = v2[1] - v0[1];
v20[2] = v2[2] - v0[2];
N[0] = v20[1] * v10[2] - v20[2] * v10[1];
N[1] = v20[2] * v10[0] - v20[0] * v10[2];
N[2] = v20[0] * v10[1] - v20[1] * v10[0];
len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
if (len2 > 0.0f) {
float len = (float)sqrt((double)len2);
N[0] /= len;
N[1] /= len;
}
}
static const char* mmap_file(size_t* len, const char* filename) {
#ifdef _WIN64
HANDLE file =
CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
assert(file != INVALID_HANDLE_VALUE);
HANDLE fileMapping = CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL);
assert(fileMapping != INVALID_HANDLE_VALUE);
LPVOID fileMapView = MapViewOfFile(fileMapping, FILE_MAP_READ, 0, 0, 0);
auto fileMapViewChar = (const char*)fileMapView;
assert(fileMapView != NULL);
#else
FILE* f;
long file_size;
struct stat sb;
char* p;
int fd;
(*len) = 0;
f = fopen(filename, "r");
fseek(f, 0, SEEK_END);
file_size = ftell(f);
fclose(f);
fd = open(filename, O_RDONLY);
if (fd == -1) {
perror("open");
return NULL;
}
if (fstat(fd, &sb) == -1) {
perror("fstat");
return NULL;
}
if (!S_ISREG(sb.st_mode)) {
fprintf(stderr, "%s is not a file\n", "lineitem.tbl");
return NULL;
}
p = (char*)mmap(0, (size_t)file_size, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
perror("mmap");
return NULL;
}
if (close(fd) == -1) {
perror("close");
return NULL;
}
(*len) = (size_t)file_size;
return p;
#endif
}
static const char* get_file_data(size_t* len, const char* filename) {
const char* ext = strrchr(filename, '.');
size_t data_len = 0;
const char* data = NULL;
if (strcmp(ext, ".gz") == 0) {
assert(0); /* todo */
} else {
data = mmap_file(&data_len, filename);
}
(*len) = data_len;
return data;
}
static int LoadObjAndConvert(float bmin[3], float bmax[3],
const char* filename) {
tinyobj_attrib_t attrib;
tinyobj_shape_t* shapes = NULL;
size_t num_shapes;
tinyobj_material_t* materials = NULL;
size_t num_materials;
size_t data_len = 0;
const char* data = get_file_data(&data_len, filename);
if (data == NULL) {
exit(-1);
/* return 0; */
}
printf("filesize: %d\n", (int)data_len);
{
unsigned int flags = TINYOBJ_FLAG_TRIANGULATE;
int ret = tinyobj_parse_obj(&attrib, &shapes, &num_shapes, &materials,
&num_materials, data, data_len, flags);
if (ret != TINYOBJ_SUCCESS) {
return 0;
}
printf("# of shapes = %d\n", (int)num_shapes);
printf("# of materials = %d\n", (int)num_materials);
/*
{
int i;
for (i = 0; i < num_shapes; i++) {
printf("shape[%d] name = %s\n", i, shapes[i].name);
}
}
*/
}
bmin[0] = bmin[1] = bmin[2] = FLT_MAX;
bmax[0] = bmax[1] = bmax[2] = -FLT_MAX;
{
DrawObject o;
float* vb;
/* std::vector<float> vb; // */
size_t face_offset = 0;
size_t i;
/* Assume triangulated face. */
size_t num_triangles = attrib.num_face_num_verts;
size_t stride = 9; /* 9 = pos(3float), normal(3float), color(3float) */
vb = (float*)malloc(sizeof(float) * stride * num_triangles * 3);
for (i = 0; i < attrib.num_face_num_verts; i++) {
size_t f;
assert(attrib.face_num_verts[i] % 3 ==
0); /* assume all triangle faces. */
for (f = 0; f < (size_t)attrib.face_num_verts[i] / 3; f++) {
size_t k;
float v[3][3];
float n[3][3];
float c[3];
float len2;
tinyobj_vertex_index_t idx0 = attrib.faces[face_offset + 3 * f + 0];
tinyobj_vertex_index_t idx1 = attrib.faces[face_offset + 3 * f + 1];
tinyobj_vertex_index_t idx2 = attrib.faces[face_offset + 3 * f + 2];
for (k = 0; k < 3; k++) {
int f0 = idx0.v_idx;
int f1 = idx1.v_idx;
int f2 = idx2.v_idx;
assert(f0 >= 0);
assert(f1 >= 0);
assert(f2 >= 0);
v[0][k] = attrib.vertices[3 * (size_t)f0 + k];
v[1][k] = attrib.vertices[3 * (size_t)f1 + k];
v[2][k] = attrib.vertices[3 * (size_t)f2 + k];
bmin[k] = (v[0][k] < bmin[k]) ? v[0][k] : bmin[k];
bmin[k] = (v[1][k] < bmin[k]) ? v[1][k] : bmin[k];
bmin[k] = (v[2][k] < bmin[k]) ? v[2][k] : bmin[k];
bmax[k] = (v[0][k] > bmax[k]) ? v[0][k] : bmax[k];
bmax[k] = (v[1][k] > bmax[k]) ? v[1][k] : bmax[k];
bmax[k] = (v[2][k] > bmax[k]) ? v[2][k] : bmax[k];
}
if (attrib.num_normals > 0) {
int f0 = idx0.vn_idx;
int f1 = idx1.vn_idx;
int f2 = idx2.vn_idx;
if (f0 >= 0 && f1 >= 0 && f2 >= 0) {
assert(f0 < (int)attrib.num_normals);
assert(f1 < (int)attrib.num_normals);
assert(f2 < (int)attrib.num_normals);
for (k = 0; k < 3; k++) {
n[0][k] = attrib.normals[3 * (size_t)f0 + k];
n[1][k] = attrib.normals[3 * (size_t)f1 + k];
n[2][k] = attrib.normals[3 * (size_t)f2 + k];
}
} else { /* normal index is not defined for this face */
/* 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];
}
} else {
/* 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 (k = 0; k < 3; k++) {
vb[(3 * i + k) * stride + 0] = v[k][0];
vb[(3 * i + k) * stride + 1] = v[k][1];
vb[(3 * i + k) * stride + 2] = v[k][2];
vb[(3 * i + k) * stride + 3] = n[k][0];
vb[(3 * i + k) * stride + 4] = n[k][1];
vb[(3 * i + k) * stride + 5] = n[k][2];
/* Use normal as color. */
c[0] = n[k][0];
c[1] = n[k][1];
c[2] = n[k][2];
len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
if (len2 > 0.0f) {
float len = (float)sqrt((double)len2);
c[0] /= len;
c[1] /= len;
c[2] /= len;
}
vb[(3 * i + k) * stride + 6] = (c[0] * 0.5f + 0.5f);
vb[(3 * i + k) * stride + 7] = (c[1] * 0.5f + 0.5f);
vb[(3 * i + k) * stride + 8] = (c[2] * 0.5f + 0.5f);
}
}
/* You can access per-face material through attrib.material_ids[i] */
face_offset += (size_t)attrib.face_num_verts[i];
}
o.vb = 0;
o.numTriangles = 0;
if (num_triangles > 0) {
glGenBuffers(1, &o.vb);
glBindBuffer(GL_ARRAY_BUFFER, o.vb);
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(num_triangles * 3 * stride * sizeof(float)),
vb, GL_STATIC_DRAW);
o.numTriangles = (int)num_triangles;
}
free(vb);
gDrawObject = o;
}
printf("bmin = %f, %f, %f\n", (double)bmin[0], (double)bmin[1],
(double)bmin[2]);
printf("bmax = %f, %f, %f\n", (double)bmax[0], (double)bmax[1],
(double)bmax[2]);
tinyobj_attrib_free(&attrib);
tinyobj_shapes_free(shapes, num_shapes);
tinyobj_materials_free(materials, num_materials);
return 1;
}
static void reshapeFunc(GLFWwindow* window, int w, int h) {
int fb_w, fb_h;
glfwGetFramebufferSize(window, &fb_w, &fb_h);
glViewport(0, 0, fb_w, fb_h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (GLdouble)w / (GLdouble)h, (GLdouble)0.01f,
(GLdouble)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;
if (key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE)
glfwSetWindowShouldClose(window, GL_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 = 1;
trackball(prev_quat, 0.0, 0.0, 0.0, 0.0);
} else if (action == GLFW_RELEASE) {
mouseLeftPressed = 0;
}
}
if (button == GLFW_MOUSE_BUTTON_RIGHT) {
if (action == GLFW_PRESS) {
mouseRightPressed = 1;
} else if (action == GLFW_RELEASE) {
mouseRightPressed = 0;
}
}
if (button == GLFW_MOUSE_BUTTON_MIDDLE) {
if (action == GLFW_PRESS) {
mouseMiddlePressed = 1;
} else if (action == GLFW_RELEASE) {
mouseMiddlePressed = 0;
}
}
}
static void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y) {
float rotScale = 1.0f;
float transScale = 2.0f;
(void)window;
if (mouseLeftPressed) {
trackball(prev_quat, rotScale * (2.0f * prevMouseX - width) / (float)width,
rotScale * (height - 2.0f * prevMouseY) / (float)height,
rotScale * (2.0f * (float)mouse_x - width) / (float)width,
rotScale * (height - 2.0f * (float)mouse_y) / (float)height);
add_quats(prev_quat, curr_quat, curr_quat);
} else if (mouseMiddlePressed) {
eye[0] -= transScale * ((float)mouse_x - prevMouseX) / (float)width;
lookat[0] -= transScale * ((float)mouse_x - prevMouseX) / (float)width;
eye[1] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
lookat[1] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
} else if (mouseRightPressed) {
eye[2] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
lookat[2] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
}
prevMouseX = (float)mouse_x;
prevMouseY = (float)mouse_y;
}
static void Draw(const DrawObject* draw_object) {
glPolygonMode(GL_FRONT, GL_FILL);
glPolygonMode(GL_BACK, GL_FILL);
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 1.0);
glColor3f(1.0f, 1.0f, 1.0f);
if (draw_object->vb >= 1) {
glBindBuffer(GL_ARRAY_BUFFER, draw_object->vb);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float) * 3));
glColorPointer(3, GL_FLOAT, 36, (const void*)(sizeof(float) * 6));
glDrawArrays(GL_TRIANGLES, 0, 3 * draw_object->numTriangles);
CheckErrors("drawarrays");
}
/* draw wireframe */
glDisable(GL_POLYGON_OFFSET_FILL);
glPolygonMode(GL_FRONT, GL_LINE);
glPolygonMode(GL_BACK, GL_LINE);
glColor3f(0.0f, 0.0f, 0.4f);
if (draw_object->vb >= 1) {
glBindBuffer(GL_ARRAY_BUFFER, draw_object->vb);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float) * 3));
glDrawArrays(GL_TRIANGLES, 0, 3 * draw_object->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) {
fprintf(stderr, "Needs input.obj\n");
return 0;
}
Init();
printf("Initialize GLFW...\n");
if (!glfwInit()) {
fprintf(stderr, "Failed to initialize GLFW.\n");
return -1;
}
gWindow = glfwCreateWindow(width, height, "Obj viewer", NULL, NULL);
if (gWindow == NULL) {
fprintf(stderr, "Failed to open GLFW window.\n");
glfwTerminate();
return 1;
}
glfwSwapInterval(1);
glfwSetWindowSizeCallback(gWindow, reshapeFunc);
glfwSetKeyCallback(gWindow, keyboardFunc);
glfwSetMouseButtonCallback(gWindow, clickFunc);
glfwSetCursorPosCallback(gWindow, motionFunc);
glfwMakeContextCurrent(gWindow);
if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
fprintf(stderr, "Failed to initialize GLAD.\n");
return -1;
}
reshapeFunc(gWindow, width, height);
{
float bmin[3], bmax[3];
float maxExtent;
if (0 == LoadObjAndConvert(bmin, bmax, argv[1])) {
printf("failed to load & conv\n");
return -1;
}
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(gWindow) == GL_FALSE) {
GLfloat mat[4][4];
glfwPollEvents();
glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt((GLdouble)eye[0], (GLdouble)eye[1], (GLdouble)eye[2],
(GLdouble)lookat[0], (GLdouble)lookat[1], (GLdouble)lookat[2],
(GLdouble)up[0], (GLdouble)up[1], (GLdouble)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(-0.5f * (bmax[0] + bmin[0]), -0.5f * (bmax[1] + bmin[1]),
-0.5f * (bmax[2] + bmin[2]));
Draw(&gDrawObject);
glfwSwapBuffers(gWindow);
}
}
glfwTerminate();
return 0;
}