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Work on assignment 2a

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This commit is contained in:
Michael Zhang 2023-04-04 02:22:46 -05:00
parent 4e550893bb
commit e8a5758103
Signed by: michael
GPG key ID: BDA47A31A3C8EE6B
13 changed files with 616 additions and 525 deletions
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BIN
assignment-2a/.DS_Store vendored
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assignment-2a/.clang-format Normal file
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---
BasedOnStyle: LLVM

165
assignment-2a/CMakeLists.txt
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# Set the minimum required version of cmake for this project
cmake_minimum_required (VERSION 3.1)
# Generate the `compile_commands.json` file.
set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE INTERNAL "")
if(CMAKE_EXPORT_COMPILE_COMMANDS)
set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
endif()
# Create a project called 'HW2a'
project(HW2a)
# Define in the C++ code what the variable "SRC_DIR" should be equal to the current_path/src
add_definitions( -DSRC_DIR="${CMAKE_CURRENT_SOURCE_DIR}/src" )
# Find OpenGL, and set link library names and include paths
find_package(OpenGL REQUIRED)
set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY})
set(OPENGL_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
include_directories(${OPENGL_INCLUDE_DIRS})
# Also disable building some of the extra things GLFW has (examples, tests, docs)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL " " FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL " " FORCE)
set(GLFW_BUILD_DOCS OFF CACHE BOOL " " FORCE)
# Now actually run cmake on the CMakeLists.txt file found inside of the GLFW directory
add_subdirectory(ext/glfw)
# Make a list of all the source files
set(
SOURCES
src/HW2a.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"
set(
INCLUDE_DIRS
ext/
ext/glfw/include
ext/glad/include
)
set(
LIBS
glfw
${OPENGL_LIBRARIES}
)
# Define what we are trying to produce here (an executable), as
# well as what items are needed to create it (the header and source files)
add_executable(${PROJECT_NAME} ${SOURCES} ${INCLUDES})
# Tell cmake which directories to look in when you #include a file
# Equivalent to the "-I" option for g++
include_directories(${INCLUDE_DIRS})
# Tell cmake which libraries to link to
# Equivalent to the "-l" option for g++
target_link_libraries(${PROJECT_NAME} PRIVATE ${LIBS})
install(TARGETS ${PROJECT_NAME} DESTINATION bin)
# For Visual Studio only
if (MSVC)
# Do a parallel compilation of this project
target_compile_options(${PROJECT_NAME} PRIVATE "/MP")
# Have this project be the default startup project (the one to build/run when hitting F5)
set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT ${PROJECT_NAME})
endif()
# 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 "")
if(CMAKE_EXPORT_COMPILE_COMMANDS)
set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
endif()
# Create a project called 'HW2a'
project(HW2a)
# Define in the C++ code what the variable "SRC_DIR" should be equal to the current_path/src
add_definitions( -DSRC_DIR="${CMAKE_CURRENT_SOURCE_DIR}/src" )
find_package(spdlog REQUIRED)
# Find OpenGL, and set link library names and include paths
find_package(OpenGL REQUIRED)
set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY})
set(OPENGL_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
include_directories(${OPENGL_INCLUDE_DIRS})
# Also disable building some of the extra things GLFW has (examples, tests, docs)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL " " FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL " " FORCE)
set(GLFW_BUILD_DOCS OFF CACHE BOOL " " FORCE)
# Now actually run cmake on the CMakeLists.txt file found inside of the GLFW directory
add_subdirectory(ext/glfw)
# Make a list of all the source files
set(
SOURCES
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
)
# Make a list of all of the directories to look in when doing #include "whatever.h"
set(
INCLUDE_DIRS
ext/
ext/glfw/include
ext/glad/include
)
set(
LIBS
glfw
spdlog::spdlog
${OPENGL_LIBRARIES}
)
# Define what we are trying to produce here (an executable), as
# well as what items are needed to create it (the header and source files)
add_executable(${PROJECT_NAME} ${SOURCES} ${INCLUDES})
# Tell cmake which directories to look in when you #include a file
# Equivalent to the "-I" option for g++
include_directories(${INCLUDE_DIRS})
# Tell cmake which libraries to link to
# Equivalent to the "-l" option for g++
target_link_libraries(${PROJECT_NAME} PRIVATE ${LIBS})
install(TARGETS ${PROJECT_NAME} DESTINATION bin)
# For Visual Studio only
if (MSVC)
# Do a parallel compilation of this project
target_compile_options(${PROJECT_NAME} PRIVATE "/MP")
# Have this project be the default startup project (the one to build/run when hitting F5)
set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT ${PROJECT_NAME})
endif()

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assignment-2a/default.nix
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@ -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 = ''

60
assignment-2a/src/controls.cpp Normal file
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#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) {
}
}

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assignment-2a/src/controls.h Normal file
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#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

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assignment-2a/src/fshader2a.glsl
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// fragment shader template
#version 150
in vec4 vcolor;
out vec4 color;
void main()
{
color = vcolor; // set output color to interpolated color from vshader
}
#version 150
in vec4 vcolor;
out vec4 color;
void main() {
color = vcolor; // set output color to interpolated color from vshader
}

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assignment-2a/src/HW2a.cpp → assignment-2a/src/main.cpp
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@ -1,277 +1,248 @@
// Skeleton code for hw2a
// Based on example code from: Interactive Computer Graphics: A Top-Down
// Approach with Shader-Based OpenGL (6th Edition), by Ed Angel
#include <iostream>
#include <math.h>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#define DEBUG_ON \
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"
//----------------------------------------------------------------------------
// initialize some basic structure types
typedef struct {
GLfloat x, y;
} FloatType2D;
typedef struct {
GLfloat r, g, b;
} ColorType3D;
GLfloat M[16]; // general transformation matrix
// define some assorted global variables, to make life easier
GLint m_location;
GLdouble mouse_x, mouse_y;
GLint window_width = 500;
GLint window_height = 500;
GLdouble pi = 4.0 * atan(1.0);
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];
GLuint vao[1], buffer, program, location1, location2;
// set up some hard-coded colors and geometry
// this part can be customized to read in an object description from a file
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
vertices[1].x = 0.25;
vertices[1].y = 0.5; // upper right
vertices[2].x = -0.25;
vertices[2].y = 0.5; // upper left
vertices[3].x = 0;
vertices[3].y = 0.25; // center (again)
vertices[4].x = 0.25;
vertices[4].y = -0.5; // low-lower right
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
vertices[8].x = -0.25;
vertices[8].y = -0.5; // mid-lower left
// Create and bind a vertex array object
glGenVertexArrays(1, vao);
glBindVertexArray(vao[0]);
// Create and initialize a buffer object large enough to hold both vertex
// position and color data
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices) + sizeof(colors), vertices,
GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
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";
// Load the shaders and use the resulting shader program
program = InitShader(vshader.str().c_str(), fshader.str().c_str());
// Determine locations of the necessary attributes and matrices used in the
// vertex shader
location1 = glGetAttribLocation(program, "vertex_position");
glEnableVertexAttribArray(location1);
glVertexAttribPointer(location1, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
location2 = glGetAttribLocation(program, "vertex_color");
glEnableVertexAttribArray(location2);
glVertexAttribPointer(location2, 3, GL_FLOAT, GL_FALSE, 0,
BUFFER_OFFSET(sizeof(vertices)));
m_location = glGetUniformLocation(program, "M");
// Define static OpenGL state variables
glClearColor(1.0, 1.0, 1.0, 1.0); // white, opaque background
// Define some GLFW cursors (in case you want to dynamically change the
// cursor's appearance) If you want, you can add more cursors, or even define
// your own cursor appearance
arrow_cursor = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
hand_cursor = glfwCreateStandardCursor(GLFW_HAND_CURSOR);
}
//----------------------------------------------------------------------------
int main(int argc, char **argv) {
int i;
GLFWwindow *window;
// Define the error callback function
glfwSetErrorCallback(error_callback);
// Initialize GLFW (performs platform-specific initialization)
if (!glfwInit())
exit(EXIT_FAILURE);
// Ask for OpenGL 3.2
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
// Use GLFW to open a window within which to display your graphics
window = glfwCreateWindow(window_width, window_height, "HW2a", NULL, NULL);
// Verify that the window was successfully created; if not, print error
// message and terminate
if (!window) {
printf("GLFW failed to create window; terminating\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window); // makes the newly-created context current
// Load all OpenGL functions (needed if using Windows)
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
printf("gladLoadGLLoader failed; terminating\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwSwapInterval(
1); // tells the system to wait for the rendered frame to finish updating
// before swapping buffers; can help to avoid tearing
// Define the keyboard callback function
glfwSetKeyCallback(window, key_callback);
// Define the mouse button callback function
glfwSetMouseButtonCallback(window, mouse_button_callback);
// Define the mouse motion callback function
glfwSetCursorPosCallback(window, cursor_pos_callback);
// Create the shaders and perform other one-time initializations
init();
// event loop
while (!glfwWindowShouldClose(window)) {
// fill/re-fill the window with the background color
glClear(GL_COLOR_BUFFER_BIT);
// define/re-define the modelview matrix. In this template, we define M to
// be the identity matrix; you will need define M according to the user's
// actions.
for (i = 0; i < 16; i++) {
M[i] = (i % 5 == 0);
}
// 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]);
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
// successive vertex pair in the hard-coded model
glFlush(); // ensure that all OpenGL calls have executed before swapping
// buffers
glfwSwapBuffers(window); // swap buffers
glfwWaitEvents(); // wait for a new event before re-drawing
} // end graphics loop
// Clean up
glfwDestroyWindow(window);
glfwTerminate(); // destroys any remaining objects, frees resources allocated
// by GLFW
exit(EXIT_SUCCESS);
} // end main
// Skeleton code for hw2a
// 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>
#define DEBUG_ON \
0 // repetitive of the debug flag in the shader loading code, included here
// for clarity only
#include "shaders.h"
#include "controls.h"
#include "util.h"
//----------------------------------------------------------------------------
// initialize some basic structure types
typedef struct {
GLfloat x, y;
} FloatType2D;
typedef struct {
GLfloat r, g, b;
} ColorType3D;
GLfloat M[16]; // general transformation matrix
// define some assorted global variables, to make life easier
GLint m_location;
GLdouble mouse_x, mouse_y;
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
void init(void) {
ColorType3D colors[NVERTICES];
FloatType2D vertices[NVERTICES];
GLuint vao[1], buffer, program, location1, location2;
// set up some hard-coded colors and geometry
// this part can be customized to read in an object description from a file
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
vertices[1].x = 0.25;
vertices[1].y = 0.5; // upper right
vertices[2].x = -0.25;
vertices[2].y = 0.5; // upper left
vertices[3].x = 0;
vertices[3].y = 0.25; // center (again)
vertices[4].x = 0.25;
vertices[4].y = -0.5; // low-lower right
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
vertices[8].x = -0.25;
vertices[8].y = -0.5; // mid-lower left
// Create and bind a vertex array object
glGenVertexArrays(1, vao);
glBindVertexArray(vao[0]);
// Create and initialize a buffer object large enough to hold both vertex
// position and color data
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices) + sizeof(colors), vertices,
GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices), sizeof(colors), colors);
// Define the names of the shader files
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.c_str(), fshader.c_str());
// Determine locations of the necessary attributes and matrices used in the
// vertex shader
location1 = glGetAttribLocation(program, "vertex_position");
glEnableVertexAttribArray(location1);
glVertexAttribPointer(location1, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
location2 = glGetAttribLocation(program, "vertex_color");
glEnableVertexAttribArray(location2);
glVertexAttribPointer(location2, 3, GL_FLOAT, GL_FALSE, 0,
BUFFER_OFFSET(sizeof(vertices)));
m_location = glGetUniformLocation(program, "M");
// Define static OpenGL state variables
glClearColor(1.0, 1.0, 1.0, 1.0); // white, opaque background
// Define some GLFW cursors (in case you want to dynamically change the
// cursor's appearance) If you want, you can add more cursors, or even define
// your own cursor appearance
arrow_cursor = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
hand_cursor = glfwCreateStandardCursor(GLFW_HAND_CURSOR);
}
//----------------------------------------------------------------------------
int main(int argc, char **argv) {
spdlog::set_level(spdlog::level::debug);
int i;
GLFWwindow *window;
// Define the error callback function
glfwSetErrorCallback(error_callback);
// Initialize GLFW (performs platform-specific initialization)
if (!glfwInit())
exit(EXIT_FAILURE);
// Ask for OpenGL 3.2
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
// Use GLFW to open a window within which to display your graphics
window = glfwCreateWindow(window_width, window_height, "HW2a", NULL, NULL);
// Verify that the window was successfully created; if not, print error
// message and terminate
if (!window) {
printf("GLFW failed to create window; terminating\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window); // makes the newly-created context current
// Load all OpenGL functions (needed if using Windows)
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
printf("gladLoadGLLoader failed; terminating\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
// 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);
// Define the mouse button callback function
glfwSetMouseButtonCallback(window, mouse_button_callback);
// Define the mouse motion callback function
glfwSetCursorPosCallback(window, cursor_pos_callback);
// Create the shaders and perform other one-time initializations
spdlog::info("Initializing...");
init();
// event loop
while (!glfwWindowShouldClose(window)) {
// fill/re-fill the window with the background color
glClear(GL_COLOR_BUFFER_BIT);
// define/re-define the modelview matrix. In this template, we define M to
// be the identity matrix; you will need define M according to the user's
// actions.
for (i = 0; i < 16; i++) {
M[i] = (i % 5 == 0);
}
// sanity check that your matrix contents are what you expect them to be
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]);
// 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
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
} // end graphics loop
// Clean up
glfwDestroyWindow(window);
glfwTerminate(); // destroys any remaining objects, frees resources allocated
// by GLFW
exit(EXIT_SUCCESS);
} // end main

296
assignment-2a/src/ShaderStuff.hpp → assignment-2a/src/shaders.h
View file

@ -1,147 +1,149 @@
#include <string>
#include <stdio.h>
#include "glad/glad.h"
#include "GLFW/glfw3.h"
// Basic OpenGL program
// Based on example code from: Interactive Computer Graphics: A Top-Down
// Approach with Shader-Based OpenGL (6th Edition), by Ed Angel
#ifndef SHADERSTUFF
#define SHADERSTUFF 1
#define DEBUG_ON 0
#define BUFFER_OFFSET(bytes) ((GLvoid *)(bytes))
// Create a NULL-terminated string by reading the provided file
static char *readShaderSource(const char *shaderFile) {
FILE *fp;
long length, count;
char *buffer;
// struct stat fileinfo;
// open the file containing the text of the shader code
fp = fopen(shaderFile, "rb");
// check for errors in opening the file
if (fp == NULL) {
printf("can't open shader source file %s\n", shaderFile);
return NULL;
}
// determine the file size
fseek(fp, 0, SEEK_END); // move position indicator to the end of the file;
length = ftell(fp); // return the value of the current position
if (DEBUG_ON)
fprintf(stdout, "length in bytes of shader file: %ld\n", length);
// allocate a buffer with the indicated number of bytes, plus one
buffer = new char[length + 1];
// read the appropriate number of bytes from the file
fseek(fp, 0, SEEK_SET); // move position indicator to the start of the file
count = fread(buffer, 1, length, fp); // read all of the bytes
if (DEBUG_ON)
fprintf(stdout, "count of bytes successfully read: %ld\n", count);
// append a NULL character to indicate the end of the string
buffer[count] = '\0'; // because on some systems, count != length
// close the file
fclose(fp);
// return the string
return buffer;
}
// Create a GLSL program object from vertex and fragment shader files
GLuint InitShader(const char *vShaderFileName, const char *fShaderFileName) {
GLuint vertex_shader, fragment_shader;
GLuint program;
// check GLSL version
if (DEBUG_ON)
printf("GLSL version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
// Create shader handlers
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
// Read source code from file
std::string vs_text = readShaderSource(vShaderFileName);
std::string fs_text = readShaderSource(fShaderFileName);
// error check
if (vs_text == "") {
printf("Failed to read from vertex shader file %s\n", vShaderFileName);
exit(1);
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", vs_text.c_str());
}
if (fs_text == "") {
printf("Failed to read from fragment shader file %s\n", fShaderFileName);
exit(1);
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", fs_text.c_str());
}
// Set shader source
const char *vv = vs_text.c_str();
const char *ff = fs_text.c_str();
glShaderSource(vertex_shader, 1, &vv, NULL);
glShaderSource(fragment_shader, 1, &ff, NULL);
// Compile shaders
glCompileShader(vertex_shader);
glCompileShader(fragment_shader);
// Check for errors in compiling shaders
GLint compiled;
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printf("vertex_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &logMaxSize);
printf("printing error message of %d bytes\n", logMaxSize);
char *logMsg = new char[logMaxSize];
glGetShaderInfoLog(vertex_shader, logMaxSize, &logLength, logMsg);
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printf("fragment_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &logMaxSize);
printf("printing error message of %d bytes\n", logMaxSize);
char *logMsg = new char[logMaxSize];
glGetShaderInfoLog(fragment_shader, logMaxSize, &logLength, logMsg);
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
// Create the program
program = glCreateProgram();
// Attach shaders to program
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
// Link and set program to use
glLinkProgram(program);
glUseProgram(program);
return program;
}
#endif
#include <spdlog/spdlog.h>
#include <string>
#include <stdio.h>
#include "glad/glad.h"
#include "GLFW/glfw3.h"
// Basic OpenGL program
// Based on example code from: Interactive Computer Graphics: A Top-Down
// Approach with Shader-Based OpenGL (6th Edition), by Ed Angel
#ifndef SHADERSTUFF
#define SHADERSTUFF 1
#define DEBUG_ON 0
#define BUFFER_OFFSET(bytes) ((GLvoid *)(bytes))
// Create a NULL-terminated string by reading the provided file
static char *readShaderSource(const char *shaderFile) {
FILE *fp;
long length, count;
char *buffer;
// struct stat fileinfo;
// open the file containing the text of the shader code
fp = fopen(shaderFile, "rb");
// check for errors in opening the file
if (fp == NULL) {
spdlog::info(":skull: can't open shader source file {}", shaderFile);
return NULL;
}
// determine the file size
fseek(fp, 0, SEEK_END); // move position indicator to the end of the file;
length = ftell(fp); // return the value of the current position
if (DEBUG_ON)
fprintf(stdout, "length in bytes of shader file: %ld\n", length);
// allocate a buffer with the indicated number of bytes, plus one
buffer = new char[length + 1];
// read the appropriate number of bytes from the file
fseek(fp, 0, SEEK_SET); // move position indicator to the start of the file
count = fread(buffer, 1, length, fp); // read all of the bytes
if (DEBUG_ON)
fprintf(stdout, "count of bytes successfully read: %ld\n", count);
// append a NULL character to indicate the end of the string
buffer[count] = '\0'; // because on some systems, count != length
// close the file
fclose(fp);
// return the string
return buffer;
}
// Create a GLSL program object from vertex and fragment shader files
GLuint InitShader(const char *vShaderFileName, const char *fShaderFileName) {
GLuint vertex_shader, fragment_shader;
GLuint program;
// check GLSL version
if (DEBUG_ON)
printf("GLSL version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
// Create shader handlers
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
// Read source code from file
std::string vs_text = readShaderSource(vShaderFileName);
std::string fs_text = readShaderSource(fShaderFileName);
// error check
if (vs_text == "") {
printf("Failed to read from vertex shader file %s\n", vShaderFileName);
exit(1);
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", vs_text.c_str());
}
if (fs_text == "") {
printf("Failed to read from fragment shader file %s\n", fShaderFileName);
exit(1);
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", fs_text.c_str());
}
// Set shader source
const char *vv = vs_text.c_str();
const char *ff = fs_text.c_str();
glShaderSource(vertex_shader, 1, &vv, NULL);
glShaderSource(fragment_shader, 1, &ff, NULL);
// Compile shaders
glCompileShader(vertex_shader);
glCompileShader(fragment_shader);
// Check for errors in compiling shaders
GLint compiled;
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printf("vertex_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &logMaxSize);
printf("printing error message of %d bytes\n", logMaxSize);
char *logMsg = new char[logMaxSize];
glGetShaderInfoLog(vertex_shader, logMaxSize, &logLength, logMsg);
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printf("fragment_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &logMaxSize);
printf("printing error message of %d bytes\n", logMaxSize);
char *logMsg = new char[logMaxSize];
glGetShaderInfoLog(fragment_shader, logMaxSize, &logLength, logMsg);
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
// Create the program
program = glCreateProgram();
// Attach shaders to program
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
// Link and set program to use
glLinkProgram(program);
glUseProgram(program);
return program;
}
#endif

13
assignment-2a/src/util.cpp Normal file
View file

@ -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);
}

12
assignment-2a/src/util.h Normal file
View file

@ -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

22
assignment-2a/src/vshader2a.glsl
View file

@ -1,12 +1,12 @@
// vertex shader template
#version 150
in vec4 vertex_position;
in vec4 vertex_color;
out vec4 vcolor;
uniform mat4 M;
void main() {
gl_Position = M*vertex_position; // update vertex position using M
vcolor = vertex_color; // pass vertex color to fragment shader
}
#version 150
in vec4 vertex_position;
in vec4 vertex_color;
out vec4 vcolor;
uniform mat4 M;
void main() {
gl_Position = M * vertex_position; // update vertex position using M
vcolor = vertex_color; // pass vertex color to fragment shader
}

4
flake.nix
View file

@ -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
]);
};
});