fuck c++

assignment-2a/src/HW2a.cpp

@@ -5,14 +5,17 @@
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <x86intrin.h>
 #include <xmmintrin.h>
 
+#include <fstream>
 #include <iostream>
 #include <istream>
 #include <optional>
 #include <sstream>
 #include <string>
+#include <vector>
 
 // Unfortunately this must be included first because it does some annoying check
 // that vomits if GLFW has already been included (dumb)
@@ -97,6 +100,12 @@ GLdouble TRANSLATE_DELTA_X = 2.0 / window_width;
 GLdouble TRANSLATE_DELTA_Y = -2.0 / window_height;
 GLdouble translate_x = 0.0, translate_y = 0.0;
 
+vector<ColorType3D> colors;
+vector<FloatType2D> vertices;
+
+bool read_file = false;
+string file_path;
+
 // Matrices
 GLfloat rotation_matrix[16], translation_matrix[16], scale_matrix[16];
 
@@ -181,37 +190,68 @@ static void cursor_pos_callback(GLFWwindow *window, double xpos, double ypos) {
 //----------------------------------------------------------------------------
 
 void init(void) {
-  ColorType3D colors[NVERTICES];
-  FloatType2D vertices[NVERTICES];
   GLuint vao[1], buffer, program, location1, location2;
 
   zeroInitGlfloats(rotation_matrix, 16);
   zeroInitGlfloats(translation_matrix, 16);
   zeroInitGlfloats(scale_matrix, 16);
 
-  // clang-format off
+  if (read_file) {
-  // set up some hard-coded colors and geometry
+    // C++ is the most disgusting language ever invented and we should get rid
-  // this part can be customized to read in an object description from a file
+    // of it as fast as possible. Just look at this mess:
-  colors[0].r = 1; colors[0].g = 1; colors[0].b = 1; // white
-  colors[1].r = 1; colors[1].g = 0; colors[1].b = 0; // red
-  colors[2].r = 1; colors[2].g = 0; colors[2].b = 0; // red
-  colors[3].r = 1; colors[3].g = 1; colors[3].b = 1; // white
-  colors[4].r = 0; colors[4].g = 0; colors[4].b = 1; // blue
-  colors[5].r = 0; colors[5].g = 0; colors[5].b = 1; // blue
-  colors[6].r = 1; colors[6].g = 1; colors[6].b = 1; // white
-  colors[7].r = 0; colors[7].g = 1; colors[7].b = 1; // cyan
-  colors[8].r = 0; colors[8].g = 1; colors[8].b = 1; // cyan
 
-  vertices[0].x = 0; vertices[0].y = 0.25; // center
+    ifstream f(file_path);
-  vertices[1].x = 0.25; vertices[1].y = 0.5; // upper right
+
-  vertices[2].x = -0.25; vertices[2].y = 0.5; // upper left
+    if (!f.is_open()) {
-  vertices[3].x = 0; vertices[3].y = 0.25; // center (again)
+      printf("Could not open file %s\n", file_path.c_str());
-  vertices[4].x = 0.25; vertices[4].y = -0.5; // low-lower right
+      exit(1);
-  vertices[5].x = 0.5; vertices[5].y = -0.25; // mid-lower right
+    }
-  vertices[6].x = 0; vertices[6].y = 0.25; // center (again)
+
-  vertices[7].x = -0.5; vertices[7].y = -0.25; // low-lower left
+    string contents, line;
-  vertices[8].x = -0.25; vertices[8].y = -0.5; // mid-lower left
+    f >> contents;
-  // clang-format on
+    f.close();
+
+    istringstream iss(contents);
+    for (std::string line; std::getline(iss, line);) {
+      printf("line: '%s'\n", line.c_str());
+      if (line.find_first_not_of("\t\n ") == string::npos) {
+        continue;
+      }
+
+      istringstream iss2(line);
+      string a;
+      std::getline(iss2, a, ',');
+
+      if (a == "v") {
+        printf("hello %s\n", line.c_str());
+      }
+    }
+
+  } else {
+    // clang-format off
+    // set up some hard-coded colors and geometry
+    // this part can be customized to read in an object description from a file
+    colors.push_back({ .r = 1, .g = 1, .b = 1 }); // white
+    colors.push_back({ .r = 1, .g = 0, .b = 0 }); // red
+    colors.push_back({ .r = 1, .g = 0, .b = 0 }); // red
+    colors.push_back({ .r = 1, .g = 1, .b = 1 }); // white
+    colors.push_back({ .r = 0, .g = 0, .b = 1 }); // blue
+    colors.push_back({ .r = 0, .g = 0, .b = 1 }); // blue
+    colors.push_back({ .r = 1, .g = 1, .b = 1 }); // white
+    colors.push_back({ .r = 0, .g = 1, .b = 1 }); // cyan
+    colors.push_back({ .r = 0, .g = 1, .b = 1 }); // cyan
+
+    vertices.push_back({ .x = 0, .y = 0.25 }); // center
+    vertices.push_back({ .x = 0.25, .y = 0.5 }); // upper right
+    vertices.push_back({ .x = -0.25, .y = 0.5 }); // upper left
+    vertices.push_back({ .x = 0, .y = 0.25 }); // center (again)
+    vertices.push_back({ .x = 0.25, .y = -0.5 }); // low-lower right
+    vertices.push_back({ .x = 0.5, .y = -0.25 }); // mid-lower right
+    vertices.push_back({ .x = 0, .y = 0.25 }); // center (again)
+    vertices.push_back({ .x = -0.5, .y = -0.25 }); // low-lower left
+    vertices.push_back({ .x = -0.25, .y = -0.5 }); // mid-lower left
+    // clang-format on
+  }
 
   // Create and bind a vertex array object
   glGenVertexArrays(1, vao);
@@ -221,12 +261,15 @@ void init(void) {
   // position and color data
   glGenBuffers(1, &buffer);
   glBindBuffer(GL_ARRAY_BUFFER, buffer);
+  cout << vertices.size() << " " << colors.size() << endl;
   glBufferData(
-      GL_ARRAY_BUFFER, sizeof(vertices) + sizeof(colors), vertices,
+      GL_ARRAY_BUFFER, vertices.size() + colors.size(), vertices.data(),
       GL_STATIC_DRAW
   );
-  glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+  glBufferSubData(GL_ARRAY_BUFFER, 0, vertices.size(), vertices.data());
-  glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices), sizeof(colors), colors);
+  glBufferSubData(
+      GL_ARRAY_BUFFER, vertices.size(), colors.size(), colors.data()
+  );
 
   // Define the names of the shader files
   std::stringstream vshader, fshader;
@@ -261,9 +304,21 @@ void init(void) {
 //----------------------------------------------------------------------------
 
 int main(int argc, char **argv) {
+  char c;
   int i;
   GLFWwindow *window;
 
+  while ((c = getopt(argc, argv, "abc:")) != -1)
+    switch (c) {
+    default:
+      exit(1);
+    }
+
+  if (argc > optind) {
+    read_file = true;
+    file_path = argv[optind];
+  }
+
   // Define the error callback function
   glfwSetErrorCallback(error_callback);