Add gl view for testing.

1 files changed, 487 insertions, 0 deletions

diff --git a/experimental/viewer.cc b/experimental/viewer.cc
new file mode 100644
index 0000000..0d58d0b
--- /dev/null
+++ b/experimental/viewer.cc
@@ -0,0 +1,487 @@
+//
+// Simple .obj viewer(vertex only)
+//
+#include <vector>
+#include <string>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <limits>
+#include <cmath>
+#include <cassert>
+#include <algorithm>	
+
+#include <GL/glew.h>
+
+#ifdef __APPLE__
+#include <OpenGL/glu.h>
+#else
+#include <GL/glu.h>
+#endif
+
+#include <GLFW/glfw3.h>
+
+#include "trackball.h"
+#include "optimized-parse.cc"
+
+typedef struct {
+  GLuint vb;    // vertex buffer
+  int numTriangles;
+} 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;
+
+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);
+  }
+}
+
+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] = 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];
+
+  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;
+  }
+}
+
+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 = fopen(filename, "r" );
+  fseek(f, 0, SEEK_END);
+  long fileSize = ftell(f);
+  fclose(f);
+
+  struct stat sb;
+  char *p;
+  int fd;
+
+  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, fileSize, PROT_READ, MAP_SHARED, fd, 0);
+
+  if (p == MAP_FAILED) {
+    perror ("mmap");
+    return NULL;
+  }
+
+  if (close (fd) == -1) {
+    perror ("close");
+    return NULL;
+  }
+
+  return p;
+
+  (*len) = fileSize;
+#endif
+}
+
+
+bool LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename)
+{
+  std::vector<float> vertices;
+  std::vector<float> normals;
+  std::vector<float> texcoords;
+  std::vector<vertex_index> faces;
+
+  size_t data_len = 0;
+  const char* data = nullptr;
+  data = mmap_file(&data_len, filename);
+  if (data == nullptr) {
+    exit(-1);
+    return false;
+  }
+  parse(vertices, normals, texcoords, faces,  data, data_len, 1);
+
+  bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
+  bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
+
+  {
+        DrawObject o;
+        std::vector<float> vb; // pos(3float), normal(3float), color(3float)
+        for (size_t f = 0; f < faces.size()/3; f++) {
+
+          vertex_index idx0 = faces[3*f+0];
+          vertex_index idx1 = faces[3*f+1];
+          vertex_index idx2 = faces[3*f+2];
+
+          float v[3][3];
+          for (int 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] = vertices[3*f0+k];
+            v[1][k] = vertices[3*f1+k];
+            v[2][k] = 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];
+
+          if (normals.size() > 0) { 
+            int f0 = idx0.vn_idx;
+            int f1 = idx1.vn_idx;
+            int f2 = idx2.vn_idx;
+            assert(f0 >= 0);
+            assert(f1 >= 0);
+            assert(f2 >= 0);
+            for (int k = 0; k < 3; k++) {
+              n[0][k] = normals[3*f0+k];
+              n[1][k] = normals[3*f1+k];
+              n[2][k] = normals[3*f2+k];
+            }
+          } 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 (int k = 0; k < 3; k++) {
+            vb.push_back(v[k][0]);
+            vb.push_back(v[k][1]);
+            vb.push_back(v[k][2]);
+            vb.push_back(n[k][0]);
+            vb.push_back(n[k][1]);
+            vb.push_back(n[k][2]);
+            // Use normal as color.
+            float c[3] = {n[k][0], n[k][1], n[k][2]};
+            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;
+            }
+            vb.push_back(c[0] * 0.5 + 0.5);
+            vb.push_back(c[1] * 0.5 + 0.5);
+            vb.push_back(c[2] * 0.5 + 0.5);
+          }
+          
+        }
+
+        o.vb = 0;
+        o.numTriangles = 0;
+        if (vb.size() > 0) {
+          glGenBuffers(1, &o.vb);
+          glBindBuffer(GL_ARRAY_BUFFER, o.vb);
+          glBufferData(GL_ARRAY_BUFFER, vb.size() * sizeof(float), &vb.at(0), GL_STATIC_DRAW);
+          o.numTriangles = vb.size() / 9 / 3;
+        }
+
+        gDrawObjects.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;
+}
+
+void reshapeFunc(GLFWwindow* window, int w, int h)
+{
+  (void)window;
+  printf("reshape\n");
+  glViewport(0, 0, w, h);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  gluPerspective(45.0, (float)w / (float)h, 0.01f, 100.0f);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+
+  width = w;
+  height = h;
+}
+
+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;
+    }
+}
+
+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;
+        }
+    }
+}
+
+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;
+}
+
+void Draw(const std::vector<DrawObject>& drawObjects)
+{
+  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 (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[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 (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[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)
+{
+  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];
+  if (false == LoadObjAndConvert(bmin, bmax, 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);
+
+    // 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);
+
+    glfwSwapBuffers(window);
+  }
+
+  glfwTerminate();
+}