Work on assignment 2a

assignment-2a/.clang-format

@@ -0,0 +1,2 @@
+---
+BasedOnStyle: LLVM

assignment-2a/CMakeLists.txt

@@ -1,5 +1,6 @@
 # Set the minimum required version of cmake for this project
 cmake_minimum_required (VERSION 3.1)
+set(CMAKE_CXX_STANDARD 17)
 
 # Generate the `compile_commands.json` file.
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE INTERNAL "")
@@ -15,6 +16,7 @@ project(HW2a)
 # Define in the C++ code what the variable "SRC_DIR" should be equal to the current_path/src
 add_definitions( -DSRC_DIR="${CMAKE_CURRENT_SOURCE_DIR}/src" )
 
+find_package(spdlog REQUIRED)
 
 # Find OpenGL, and set link library names and include paths
 find_package(OpenGL REQUIRED)
@@ -33,15 +35,15 @@ add_subdirectory(ext/glfw)
 # Make a list of all the source files
 set(
     SOURCES
-    src/HW2a.cpp
-
+    src/main.cpp
+    src/controls.cpp
+    src/util.cpp
     ext/glad/src/glad.c
 )
 
 # Make a list of all the header files (optional-- only necessary to make them appear in IDE)
 set(
     INCLUDES
-    src/ShaderStuff.hpp
 )
 
 # Make a list of all of the directories to look in when doing #include "whatever.h"
@@ -55,6 +57,7 @@ set(
 set(
     LIBS
     glfw
+    spdlog::spdlog
     ${OPENGL_LIBRARIES}
 )
 

assignment-2a/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, cmake, ninja, libglvnd, libGLU, xorg }:
+{ stdenv, cmake, ninja, libglvnd, libGLU, xorg, spdlog }:
 
 stdenv.mkDerivation {
   name = "assignment-2a";
@@ -15,6 +15,7 @@ stdenv.mkDerivation {
     xorg.libXinerama
     xorg.libXrandr
     xorg.libXrender
+    spdlog
   ];
 
   preBuild = ''

assignment-2a/src/controls.cpp

@@ -0,0 +1,60 @@
+#include "controls.h"
+#include "GLFW/glfw3.h"
+#include <spdlog/spdlog.h>
+
+void key_callback(GLFWwindow *window, int key, int scancode, int action,
+                  int mods) {
+  int state = glfwGetKey(window, GLFW_KEY_E);
+
+  // checks to see if the escape or q key was pressed
+  if ((key == GLFW_KEY_ESCAPE || key == GLFW_KEY_Q) && action == GLFW_PRESS)
+    glfwSetWindowShouldClose(window, GL_TRUE);
+
+  if ((mods & GLFW_MOD_CONTROL) > 0) {
+    if (action == GLFW_PRESS) {
+      ctrl_pressed = true;
+      spdlog::debug("Press ctrl");
+    } else if (action == GLFW_RELEASE) {
+      ctrl_pressed = false;
+      spdlog::debug("Release ctrl");
+    }
+
+  } else {
+  }
+}
+
+void mouse_button_callback(GLFWwindow *window, int button, int action,
+                           int mods) {
+  glfwGetCursorPos(window, &mouse_x, &mouse_y);
+  if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS) {
+  }
+
+  // Pressed the left mouse button, starting drag
+  if (ctrl_pressed && button == GLFW_MOUSE_BUTTON_LEFT &&
+      action == GLFW_PRESS) {
+    is_dragging = true;
+    drag_start_x = mouse_x;
+    drag_start_y = mouse_y;
+    spdlog::debug("Start drag at ({}, {})!", drag_start_x, drag_start_y);
+  }
+
+  // Check which mouse button triggered the event, e.g. GLFW_MOUSE_BUTTON_LEFT,
+  // etc. and what the button action was, e.g. GLFW_PRESS, GLFW_RELEASE, etc.
+  // (Note that ordinary trackpad click = mouse left button)
+  // Also check if any modifier keys were active at the time of the button
+  // press, e.g. GLFW_MOD_ALT, etc. Take the appropriate action, which could
+  // (optionally) also include changing the cursor's appearance
+}
+
+void cursor_pos_callback(GLFWwindow *window, double xpos, double ypos) {
+  // determine the direction of the mouse or cursor motion
+  // update the current mouse or cursor location
+  mouse_x = xpos;
+  mouse_y = ypos;
+
+  //  (necessary to quantify the amount and direction of cursor motion)
+  // take the appropriate action
+
+  if (is_dragging) {
+  }
+}

assignment-2a/src/controls.h

@@ -0,0 +1,25 @@
+#ifndef PERIPHERALS_H_
+#define PERIPHERALS_H_
+
+#include "GLFW/glfw3.h"
+
+extern GLdouble mouse_x, mouse_y;
+extern GLfloat M[16];
+
+extern bool is_dragging, ctrl_pressed;
+extern GLdouble drag_start_x, drag_start_y;
+
+// function that is called whenever a keyboard event occurs; defines how
+// keyboard input will be handled
+void key_callback(GLFWwindow *window, int key, int scancode, int action,
+                  int mods);
+
+// function that is called whenever a mouse or trackpad button press event
+// occurs
+void mouse_button_callback(GLFWwindow *window, int button, int action,
+                           int mods);
+
+// function that is called whenever a cursor motion event occurs
+void cursor_pos_callback(GLFWwindow *window, double xpos, double ypos);
+
+#endif

assignment-2a/src/fshader2a.glsl

@@ -3,7 +3,7 @@
 #version 150
 in vec4 vcolor;
 out vec4 color;
-void main() 
-{
+
+void main() {
   color = vcolor; // set output color to interpolated color from vshader
 }

assignment-2a/src/main.cpp

@@ -2,8 +2,11 @@
 // Based on example code from: Interactive Computer Graphics: A Top-Down
 // Approach with Shader-Based OpenGL (6th Edition), by Ed Angel
 
+#include <fmt/core.h>
+#include <fmt/format.h>
 #include <iostream>
 #include <math.h>
+#include <spdlog/spdlog.h>
 #include <sstream>
 #include <stdio.h>
 #include <stdlib.h>
@@ -12,9 +15,10 @@
   0 // repetitive of the debug flag in the shader loading code, included here
     // for clarity only
 
-// This file contains the code that reads the shaders from their files and
-// compiles them
-#include "ShaderStuff.hpp"
+#include "shaders.h"
+
+#include "controls.h"
+#include "util.h"
 
 //----------------------------------------------------------------------------
 
@@ -36,53 +40,16 @@ GLint window_width = 500;
 GLint window_height = 500;
 GLdouble pi = 4.0 * atan(1.0);
 
+bool is_dragging = false;
+bool ctrl_pressed = false;
+GLdouble drag_start_x, drag_start_y;
+
+double figure_x, figure_y, figure_z;
+
 GLFWcursor *hand_cursor, *arrow_cursor; // some different cursors
 
 GLint NVERTICES = 9; // part of the hard-coded model
 
-//----------------------------------------------------------------------------
-// function that is called whenever an error occurs
-static void error_callback(int error, const char *description) {
-  fputs(description, stderr); // write the error description to stderr
-}
-
-//----------------------------------------------------------------------------
-// function that is called whenever a keyboard event occurs; defines how
-// keyboard input will be handled
-static void key_callback(GLFWwindow *window, int key, int scancode, int action,
-                         int mods) {
-  if (key == GLFW_KEY_ESCAPE &&
-      action == GLFW_PRESS) // checks to see if the escape key was pressed
-    glfwSetWindowShouldClose(window, GL_TRUE); // closes the window
-}
-
-//----------------------------------------------------------------------------
-// function that is called whenever a mouse or trackpad button press event
-// occurs
-static void mouse_button_callback(GLFWwindow *window, int button, int action,
-                                  int mods) {
-  glfwGetCursorPos(window, &mouse_x, &mouse_y);
-
-  // Check which mouse button triggered the event, e.g. GLFW_MOUSE_BUTTON_LEFT,
-  // etc. and what the button action was, e.g. GLFW_PRESS, GLFW_RELEASE, etc.
-  // (Note that ordinary trackpad click = mouse left button)
-  // Also check if any modifier keys were active at the time of the button
-  // press, e.g. GLFW_MOD_ALT, etc. Take the appropriate action, which could
-  // (optionally) also include changing the cursor's appearance
-}
-
-//----------------------------------------------------------------------------
-// function that is called whenever a cursor motion event occurs
-static void cursor_pos_callback(GLFWwindow *window, double xpos, double ypos) {
-
-  // determine the direction of the mouse or cursor motion
-  // update the current mouse or cursor location
-  //  (necessary to quantify the amount and direction of cursor motion)
-  // take the appropriate action
-}
-
-//----------------------------------------------------------------------------
-
 void init(void) {
   ColorType3D colors[NVERTICES];
   FloatType2D vertices[NVERTICES];
@@ -151,12 +118,13 @@ void init(void) {
   glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices), sizeof(colors), colors);
 
   // Define the names of the shader files
-  std::stringstream vshader, fshader;
-  vshader << SRC_DIR << "/vshader2a.glsl";
-  fshader << SRC_DIR << "/fshader2a.glsl";
+  string shader_dir = env("SHADER_DIR").value_or(SRC_DIR);
+  string vshader = fmt::format("{}/vshader2a.glsl", shader_dir);
+  string fshader = fmt::format("{}/fshader2a.glsl", shader_dir);
+  spdlog::info("Shaders from: {}", shader_dir);
 
   // Load the shaders and use the resulting shader program
-  program = InitShader(vshader.str().c_str(), fshader.str().c_str());
+  program = InitShader(vshader.c_str(), fshader.c_str());
 
   // Determine locations of the necessary attributes and matrices used in the
   // vertex shader
@@ -182,6 +150,7 @@ void init(void) {
 //----------------------------------------------------------------------------
 
 int main(int argc, char **argv) {
+  spdlog::set_level(spdlog::level::debug);
 
   int i;
   GLFWwindow *window;
@@ -219,9 +188,9 @@ int main(int argc, char **argv) {
     exit(EXIT_FAILURE);
   }
 
-  glfwSwapInterval(
-      1); // tells the system to wait for the rendered frame to finish updating
+  // tells the system to wait for the rendered frame to finish updating
   // before swapping buffers; can help to avoid tearing
+  glfwSwapInterval(1);
 
   // Define the keyboard callback function
   glfwSetKeyCallback(window, key_callback);
@@ -231,6 +200,7 @@ int main(int argc, char **argv) {
   glfwSetCursorPosCallback(window, cursor_pos_callback);
 
   // Create the shaders and perform other one-time initializations
+  spdlog::info("Initializing...");
   init();
 
   // event loop
@@ -247,21 +217,22 @@ int main(int argc, char **argv) {
     }
 
     // sanity check that your matrix contents are what you expect them to be
-    if (DEBUG_ON)
-      printf("M = [%f %f %f %f\n     %f %f %f %f\n     %f %f %f %f\n     %f %f "
-             "%f %f]\n",
-             M[0], M[4], M[8], M[12], M[1], M[5], M[9], M[13], M[2], M[6],
-             M[10], M[14], M[3], M[7], M[11], M[15]);
+    spdlog::debug(
+        "M = [{} {} {} {}\n     {} {} {} {}\n     {} {} {} {}\n     {} {} "
+        "{} {}]\n",
+        M[0], M[4], M[8], M[12], M[1], M[5], M[9], M[13], M[2], M[6], M[10],
+        M[14], M[3], M[7], M[11], M[15]);
 
-    glUniformMatrix4fv(
-        m_location, 1, GL_FALSE,
-        M); // send the updated model transformation matrix to the GPU
-    glDrawArrays(
-        GL_TRIANGLES, 0,
-        NVERTICES); // draw a triangle between the first vertex and each
+    // send the updated model transformation matrix to the GPU
+    glUniformMatrix4fv(m_location, 1, GL_FALSE, M);
+
+    // draw a triangle between the first vertex and each
     // successive vertex pair in the hard-coded model
-    glFlush(); // ensure that all OpenGL calls have executed before swapping
+    glDrawArrays(GL_TRIANGLES, 0, NVERTICES);
+
+    // ensure that all OpenGL calls have executed before swapping
     // buffers
+    glFlush();
 
     glfwSwapBuffers(window); // swap buffers
     glfwWaitEvents();        // wait for a new event before re-drawing

assignment-2a/src/shaders.h

@@ -1,8 +1,10 @@
+#include <spdlog/spdlog.h>
 #include <string>
 
 #include <stdio.h>
 
 #include "glad/glad.h"
+
 #include "GLFW/glfw3.h"
 
 // Basic OpenGL program
@@ -27,7 +29,7 @@ static char *readShaderSource(const char *shaderFile) {
 
   // check for errors in opening the file
   if (fp == NULL) {
-    printf("can't open shader source file %s\n", shaderFile);
+    spdlog::info(":skull: can't open shader source file {}", shaderFile);
     return NULL;
   }
 

assignment-2a/src/util.cpp

@@ -0,0 +1,13 @@
+#include "util.h"
+#include <spdlog/spdlog.h>
+
+optional<string> env(string ident) {
+  char *result = getenv(ident.c_str());
+  if (!result)
+    return {};
+  return string(result);
+}
+
+void error_callback(int error, const char *description) {
+  spdlog::error("{}", description);
+}

assignment-2a/src/util.h

@@ -0,0 +1,12 @@
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include <optional>
+#include <string>
+
+using namespace std;
+
+optional<string> env(string ident);
+void error_callback(int error, const char *description);
+
+#endif

flake.nix

@@ -31,12 +31,13 @@
             cargo-watch
             clang-tools
             cmake
+            dos2unix
             imagemagick
             linuxPackages_latest.perf
+            ninja
             pandoc
             poppler_utils
             texlive.combined.scheme-full
-            ninja
             unzip
             zip
 
@@ -62,6 +63,7 @@
               xorg.libXinerama
               xorg.libXrandr
               xorg.libXrender
+              spdlog
             ]);
         };
       });