Experimental C89 version(W.I.P.).
This commit is contained in:
Syoyo Fujita
4
experimental/Makefile
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4
experimental/Makefile
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@@ -0,0 +1,4 @@
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all:
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clang -c trackball.c
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clang -pedantic -ansi -Wno-deprecated-declarations viewer-c.c trackball.o -framework OpenGL -lglfw3 -lglew
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# clang -pedantic -ansi -Weverything -Wno-deprecated-declarations viewer-c.c trackball.o -framework OpenGL -lglfw3 -lglew
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1367
experimental/tinyobj_loader_c.h
Normal file
1367
experimental/tinyobj_loader_c.h
Normal file
File diff suppressed because it is too large
Load Diff
578
experimental/viewer-c.c
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578
experimental/viewer-c.c
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@@ -0,0 +1,578 @@
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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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#define TINYOBJ_LOADER_C_IMPLEMENTATION
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#include "tinyobj_loader_c.h"
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#define MAX_OBJECTS (128)
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typedef struct {
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GLuint vb;
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int numTriangles;
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} DrawObject;
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static DrawObject gDrawObjects[MAX_OBJECTS];
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static int gNumDrawObjects;
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static int width = 768;
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static int height = 768;
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static float prevMouseX, prevMouseY;
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static int mouseLeftPressed;
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static int mouseMiddlePressed;
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static int mouseRightPressed;
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static float curr_quat[4];
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static float prev_quat[4];
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static float eye[3], lookat[3], up[3];
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static GLFWwindow* gWindow;
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static void CheckErrors(const char* 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, e, e);
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exit(20);
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}
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}
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static 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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float v20[3];
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float len2;
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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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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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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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static 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;
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long file_size;
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struct stat sb;
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char *p;
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int fd;
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(*len) = 0;
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f = fopen(filename, "r" );
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fseek(f, 0, SEEK_END);
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file_size = ftell(f);
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fclose(f);
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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, (size_t)file_size, 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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(*len) = (size_t)file_size;
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return p;
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#endif
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}
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#if 0
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static int gz_load(std::vector<char>* buf, const char* filename)
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{
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#ifdef ENABLE_ZLIB
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gzFile file;
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file = gzopen (filename, "r");
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if (! file) {
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fprintf (stderr, "gzopen of '%s' failed: %s.\n", filename,
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strerror (errno));
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exit (EXIT_FAILURE);
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return false;
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}
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while (1) {
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int err;
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int bytes_read;
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unsigned char buffer[1024];
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bytes_read = gzread (file, buffer, 1024);
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buf->insert(buf->end(), buffer, buffer + 1024);
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//printf ("%s", buffer);
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if (bytes_read < 1024) {
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if (gzeof (file)) {
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break;
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}
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else {
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const char * error_string;
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error_string = gzerror (file, & err);
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if (err) {
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fprintf (stderr, "Error: %s.\n", error_string);
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exit (EXIT_FAILURE);
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return false;
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}
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}
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}
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}
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gzclose (file);
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return true;
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#else
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return false;
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#endif
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}
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#endif
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static const char* get_file_data(size_t *len, const char* filename)
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{
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const char *ext = strrchr(filename, '.');
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size_t data_len = 0;
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const char* data = NULL;
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if (strcmp(ext, ".gz") == 0) {
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assert(0); /* todo */
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#if 0
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std::vector<char> buf;
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bool ret = gz_load(&buf, filename);
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if (ret) {
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char *p = static_cast<char*>(malloc(buf.size() + 1)); // @fixme { implement deleter }
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memcpy(p, &buf.at(0), buf.size());
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p[buf.size()] = '\0';
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data = p;
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data_len = buf.size();
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}
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#endif
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} else {
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data = mmap_file(&data_len, filename);
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}
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(*len) = data_len;
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return data;
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}
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#if 0
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static int LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename)
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{
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#if 1
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tinyobj_opt::attrib_t attrib;
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std::vector<tinyobj_opt::shape_t> shapes;
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size_t data_len = 0;
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const char* data = get_file_data(&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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printf("filesize: %d\n", (int)data_len);
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tinyobj_opt::LoadOption option;
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option.req_num_threads = num_threads;
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bool ret = parseObj(&attrib, &shapes, data, data_len, option);
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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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size_t face_offset = 0;
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for (size_t v = 0; v < attrib.face_num_verts.size(); v++) {
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assert(attrib.face_num_verts[v] % 3 == 0); // assume all triangle face.
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for (size_t f = 0; f < attrib.face_num_verts[v] / 3; f++) {
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tinyobj_opt::vertex_index idx0 = attrib.faces[face_offset+3*f+0];
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tinyobj_opt::vertex_index idx1 = attrib.faces[face_offset+3*f+1];
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tinyobj_opt::vertex_index idx2 = attrib.faces[face_offset+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] = attrib.vertices[3*f0+k];
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v[1][k] = attrib.vertices[3*f1+k];
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v[2][k] = attrib.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 (attrib.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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assert(3*f0+2 < attrib.normals.size());
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assert(3*f1+2 < attrib.normals.size());
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assert(3*f2+2 < attrib.normals.size());
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for (int k = 0; k < 3; k++) {
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n[0][k] = attrib.normals[3*f0+k];
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n[1][k] = attrib.normals[3*f1+k];
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n[2][k] = attrib.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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face_offset += attrib.face_num_verts[v];
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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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#else
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return false;
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#endif
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}
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#endif
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static void reshapeFunc(GLFWwindow* window, int w, int h)
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{
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int fb_w, fb_h;
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glfwGetFramebufferSize(window, &fb_w, &fb_h);
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glViewport(0, 0, fb_w, fb_h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0, (GLdouble)w / (GLdouble)h, (GLdouble)0.01f, (GLdouble)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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static 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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if(key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE) glfwSetWindowShouldClose(window, GL_TRUE);
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}
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}
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static 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 = 1;
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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 = 0;
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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 = 1;
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} else if(action == GLFW_RELEASE){
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mouseRightPressed = 0;
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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 = 1;
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} else if(action == GLFW_RELEASE){
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mouseMiddlePressed = 0;
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}
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}
|
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}
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static void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y){
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float rotScale = 1.0f;
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float transScale = 2.0f;
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(void)window;
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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 * (float)mouse_x - width) / (float)width,
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rotScale * (height - 2.0f * (float)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 * ((float)mouse_x - prevMouseX) / (float)width;
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lookat[0] -= transScale * ((float)mouse_x - prevMouseX) / (float)width;
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eye[1] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
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lookat[1] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
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} else if (mouseRightPressed) {
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eye[2] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
|
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lookat[2] += transScale * ((float)mouse_y - prevMouseY) / (float)height;
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}
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prevMouseX = (float)mouse_x;
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prevMouseY = (float)mouse_y;
|
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}
|
||||
|
||||
static void Draw(const DrawObject* draw_objects, int num_draw_objects)
|
||||
{
|
||||
int i;
|
||||
|
||||
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);
|
||||
for (i = 0; i < num_draw_objects; i++) {
|
||||
const DrawObject o = draw_objects[i];
|
||||
if (o.vb < 1) {
|
||||
continue;
|
||||
}
|
||||
|
||||
glBindBuffer(GL_ARRAY_BUFFER, o.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 * o.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);
|
||||
for (i = 0; i < num_draw_objects; i++) {
|
||||
DrawObject o = draw_objects[i];
|
||||
if (o.vb < 1) {
|
||||
continue;
|
||||
}
|
||||
|
||||
glBindBuffer(GL_ARRAY_BUFFER, o.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 * 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)
|
||||
{
|
||||
(void)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;
|
||||
}
|
||||
|
||||
glfwMakeContextCurrent(gWindow);
|
||||
glfwSwapInterval(1);
|
||||
|
||||
glfwSetWindowSizeCallback(gWindow, reshapeFunc);
|
||||
glfwSetKeyCallback(gWindow, keyboardFunc);
|
||||
glfwSetMouseButtonCallback(gWindow, clickFunc);
|
||||
glfwSetCursorPosCallback(gWindow, motionFunc);
|
||||
|
||||
/* glewExperimental = 1; */
|
||||
if (glewInit() != GLEW_OK) {
|
||||
fprintf(stderr, "Failed to initialize GLEW.\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
reshapeFunc(gWindow, width, height);
|
||||
|
||||
{
|
||||
float bmin[3], bmax[3];
|
||||
#if 0
|
||||
if (false == LoadObjAndConvert(bmin, bmax, argv[1], num_threads)) {
|
||||
printf("failed to load & conv\n");
|
||||
return -1;
|
||||
}
|
||||
#endif
|
||||
|
||||
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(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(gDrawObjects, gNumDrawObjects);
|
||||
|
||||
glfwSwapBuffers(gWindow);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
glfwTerminate();
|
||||
}
|
||||
Reference in New Issue
Block a user