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This commit is contained in:
Michael Zhang 2023-04-16 00:22:02 -05:00
parent 0a2e37a04d
commit 2100a9c221
Signed by: michael
GPG key ID: BDA47A31A3C8EE6B
8 changed files with 791 additions and 638 deletions
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1
assignment-2b/.gitignore vendored
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@ -1,2 +1,3 @@
/build
.DS_Store
.cache

8
assignment-2b/CMakeLists.txt Executable file → Normal file
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@ -4,6 +4,14 @@ cmake_minimum_required (VERSION 3.1)
# Create a project called 'HW2b'
project(HW2b)
# 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()
# Find OpenGL, set link library names and include paths
find_package(OpenGL REQUIRED)
set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY})

1
assignment-2b/compile_commands.json Symbolic link
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@ -0,0 +1 @@
build/compile_commands.json

210
assignment-2b/src/main.cpp
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@ -1,12 +1,14 @@
// This template code was originally written by Matt Overby while a TA for CSci5607
// This template code was originally written by Matt Overby while a TA for
// CSci5607
#include "glad/glad.h"
// The loaders are included by glfw3 (glcorearb.h) if we are not using glew.
#include "glad/glad.h"
#include "GLFW/glfw3.h"
// Includes
#include "trimesh.hpp"
#include "shader.hpp"
#include "trimesh.hpp"
#include <cstring> // memcpy
// Constants
@ -15,137 +17,171 @@
class Mat4x4 {
public:
float m[16];
// clang-format off
Mat4x4(){ // Default: Identity
m[0] = 1.f; m[4] = 0.f; m[8] = 0.f; m[12] = 0.f;
m[1] = 0.f; m[5] = 1.f; m[9] = 0.f; m[13] = 0.f;
m[2] = 0.f; m[6] = 0.f; m[10] = 1.f; m[14] = 0.f;
m[3] = 0.f; m[7] = 0.f; m[11] = 0.f; m[15] = 1.f;
}
// clang-format on
// clang-format off
void make_identity(){
m[0] = 1.f; m[4] = 0.f; m[8] = 0.f; m[12] = 0.f;
m[1] = 0.f; m[5] = 1.f; m[9] = 0.f; m[13] = 0.f;
m[2] = 0.f; m[6] = 0.f; m[10] = 1.f; m[14] = 0.f;
m[3] = 0.f; m[7] = 0.f; m[11] = 0.f; m[15] = 1.f;
}
// clang-format on
// clang-format off
void print(){
std::cout << m[0] << ' ' << m[4] << ' ' << m[8] << ' ' << m[12] << "\n";
std::cout << m[1] << ' ' << m[5] << ' ' << m[9] << ' ' << m[13] << "\n";
std::cout << m[2] << ' ' << m[6] << ' ' << m[10] << ' ' << m[14] << "\n";
std::cout << m[3] << ' ' << m[7] << ' ' << m[11] << ' ' << m[15] << "\n";
}
// clang-format on
void make_scale(float x, float y, float z){
void make_scale(float x, float y, float z) {
make_identity();
m[0] = x; m[5] = y; m[10] = z;
m[0] = x;
m[5] = y;
m[10] = z;
}
};
static inline const Vec3f operator*(const Mat4x4 &m, const Vec3f &v){
Vec3f r( m.m[0]*v[0]+m.m[4]*v[1]+m.m[8]*v[2],
m.m[1]*v[0]+m.m[5]*v[1]+m.m[9]*v[2],
m.m[2]*v[0]+m.m[6]*v[1]+m.m[10]*v[2] );
static inline const Vec3f operator*(const Mat4x4 &m, const Vec3f &v) {
Vec3f r(m.m[0] * v[0] + m.m[4] * v[1] + m.m[8] * v[2],
m.m[1] * v[0] + m.m[5] * v[1] + m.m[9] * v[2],
m.m[2] * v[0] + m.m[6] * v[1] + m.m[10] * v[2]);
return r;
}
//
// Global state variables
//
namespace Globals {
double cursorX, cursorY; // cursor positions
float win_width, win_height; // window size
float aspect;
GLuint verts_vbo[1], colors_vbo[1], normals_vbo[1], faces_ibo[1], tris_vao;
TriMesh mesh;
// Model, view and projection matrices, initialized to the identity
Mat4x4 model; // not used in this assignment; included for completeness only
Mat4x4 view;
Mat4x4 projection;
}
double cursorX, cursorY; // cursor positions
float win_width, win_height; // window size
float aspect;
GLuint verts_vbo[1], colors_vbo[1], normals_vbo[1], faces_ibo[1], tris_vao;
TriMesh mesh;
// Model, view and projection matrices, initialized to the identity
Mat4x4 model; // not used in this assignment; included for completeness only
Mat4x4 view;
Mat4x4 projection;
} // namespace Globals
//
// Callbacks
//
static void error_callback(int error, const char* description){ fprintf(stderr, "Error: %s\n", description); }
static void error_callback(int error, const char *description) {
fprintf(stderr, "Error: %s\n", description);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods){
static void key_callback(GLFWwindow *window, int key, int scancode, int action,
int mods) {
// Close on escape or Q
if( action == GLFW_PRESS ){
switch ( key ) {
case GLFW_KEY_ESCAPE: glfwSetWindowShouldClose(window, GL_TRUE); break;
case GLFW_KEY_Q: glfwSetWindowShouldClose(window, GL_TRUE); break;
if (action == GLFW_PRESS) {
switch (key) {
case GLFW_KEY_ESCAPE:
glfwSetWindowShouldClose(window, GL_TRUE);
break;
case GLFW_KEY_Q:
glfwSetWindowShouldClose(window, GL_TRUE);
break;
// ToDo: update the viewing transformation matrix according to key presses
}
}
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height){
static void framebuffer_size_callback(GLFWwindow *window, int width,
int height) {
Globals::win_width = float(width);
Globals::win_height = float(height);
Globals::aspect = Globals::win_width/Globals::win_height;
Globals::aspect = Globals::win_width / Globals::win_height;
glViewport(0,0,width,height);
glViewport(0, 0, width, height);
// ToDo: update the perspective matrix as the window size changes
}
// Function to set up geometry
void init_scene();
//
// Main
//
int main(int argc, char *argv[]){
int main(int argc, char *argv[]) {
// Load the mesh
std::stringstream obj_file; obj_file << MY_DATA_DIR << "sibenik/sibenik.obj";
if( !Globals::mesh.load_obj( obj_file.str() ) ){ return 0; }
std::stringstream obj_file;
obj_file << MY_DATA_DIR << "sibenik/sibenik.obj";
if (!Globals::mesh.load_obj(obj_file.str())) {
return 0;
}
Globals::mesh.print_details();
// Forcibly scale the mesh vertices so that the entire model fits within a (-1,1) volume: the code below is a temporary measure that is needed to enable the entire model to be visible in the template app, before the student has defined the proper viewing and projection matrices
// This code should eventually be replaced by the use of an appropriate projection matrix
// FYI: the model dimensions are: center = (0,0,0); height: 30.6; length: 40.3; width: 17.0
// find the extremum of the vertex locations (this approach works because the model is known to be centered; a more complicated method would be required in the general case)
// Forcibly scale the mesh vertices so that the entire model fits within a
// (-1,1) volume: the code below is a temporary measure that is needed to
// enable the entire model to be visible in the template app, before the
// student has defined the proper viewing and projection matrices This code
// should eventually be replaced by the use of an appropriate projection
// matrix FYI: the model dimensions are: center = (0,0,0); height: 30.6;
// length: 40.3; width: 17.0
// find the extremum of the vertex locations (this approach works because the
// model is known to be centered; a more complicated method would be required
// in the general case)
float min, max, scale;
min = Globals::mesh.vertices[0][0]; max = Globals::mesh.vertices[0][0];
for( int i=0; i<Globals::mesh.vertices.size(); ++i ){
if (Globals::mesh.vertices[i][0] < min) min = Globals::mesh.vertices[i][0];
else if (Globals::mesh.vertices[i][0] > max) max = Globals::mesh.vertices[i][0];
if (Globals::mesh.vertices[i][1] < min) min = Globals::mesh.vertices[i][1];
else if (Globals::mesh.vertices[i][1] > max) max = Globals::mesh.vertices[i][1];
if (Globals::mesh.vertices[i][2] < min) min = Globals::mesh.vertices[i][2];
else if (Globals::mesh.vertices[i][2] > max) max = Globals::mesh.vertices[i][2];
min = Globals::mesh.vertices[0][0];
max = Globals::mesh.vertices[0][0];
for (int i = 0; i < Globals::mesh.vertices.size(); ++i) {
if (Globals::mesh.vertices[i][0] < min)
min = Globals::mesh.vertices[i][0];
else if (Globals::mesh.vertices[i][0] > max)
max = Globals::mesh.vertices[i][0];
if (Globals::mesh.vertices[i][1] < min)
min = Globals::mesh.vertices[i][1];
else if (Globals::mesh.vertices[i][1] > max)
max = Globals::mesh.vertices[i][1];
if (Globals::mesh.vertices[i][2] < min)
min = Globals::mesh.vertices[i][2];
else if (Globals::mesh.vertices[i][2] > max)
max = Globals::mesh.vertices[i][2];
}
// work with positive numbers
if (min < 0) min = -min;
// scale so that the component that is most different from 0 is mapped to 1 (or -1); all other values will then by definition fall between -1 and 1
if (max > min) scale = 1/max; else scale = 1/min;
if (min < 0)
min = -min;
// scale so that the component that is most different from 0 is mapped to 1
// (or -1); all other values will then by definition fall between -1 and 1
if (max > min)
scale = 1 / max;
else
scale = 1 / min;
// scale the model vertices by brute force
Mat4x4 mscale; mscale.make_scale( scale, scale, scale );
for( int i=0; i<Globals::mesh.vertices.size(); ++i ){
Globals::mesh.vertices[i] = mscale*Globals::mesh.vertices[i];
Mat4x4 mscale;
mscale.make_scale(scale, scale, scale);
for (int i = 0; i < Globals::mesh.vertices.size(); ++i) {
Globals::mesh.vertices[i] = mscale * Globals::mesh.vertices[i];
}
// The above can be removed once a proper projection matrix is defined
// Set up the window variable
GLFWwindow* window;
GLFWwindow *window;
// Define the error callback function
glfwSetErrorCallback(&error_callback);
// Initialize glfw
if( !glfwInit() ){ return EXIT_FAILURE; }
if (!glfwInit()) {
return EXIT_FAILURE;
}
// Ask for OpenGL 3.3
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
@ -156,8 +192,12 @@ int main(int argc, char *argv[]){
// Create the glfw window
Globals::win_width = WIN_WIDTH;
Globals::win_height = WIN_HEIGHT;
window = glfwCreateWindow(int(Globals::win_width), int(Globals::win_height), "HW2b", NULL, NULL);
if( !window ){ glfwTerminate(); return EXIT_FAILURE; }
window = glfwCreateWindow(int(Globals::win_width), int(Globals::win_height),
"HW2b", NULL, NULL);
if (!window) {
glfwTerminate();
return EXIT_FAILURE;
}
// Define callbacks to handle user input and window resizing
glfwSetKeyCallback(window, &key_callback);
@ -178,16 +218,18 @@ int main(int argc, char *argv[]){
// MY_SRC_DIR was defined in CMakeLists.txt
// it specifies the full path to this project's src/ directory.
mcl::Shader shader;
std::stringstream ss; ss << MY_SRC_DIR << "shader.";
shader.init_from_files( ss.str()+"vert", ss.str()+"frag" );
std::stringstream ss;
ss << MY_SRC_DIR << "shader.";
shader.init_from_files(ss.str() + "vert", ss.str() + "frag");
// Initialize the scene
init_scene();
framebuffer_size_callback(window, int(Globals::win_width), int(Globals::win_height));
framebuffer_size_callback(window, int(Globals::win_width),
int(Globals::win_height));
// Perform some OpenGL initializations
glEnable(GL_DEPTH_TEST); // turn hidden surfce removal on
glClearColor(1.f,1.f,1.f,1.f); // set the background to white
glClearColor(1.f, 1.f, 1.f, 1.f); // set the background to white
// Enable the shader, this allows us to set uniforms and attributes
shader.enable();
@ -197,18 +239,23 @@ int main(int argc, char *argv[]){
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, Globals::faces_ibo[0]);
// Game loop
while( !glfwWindowShouldClose(window) ){
while (!glfwWindowShouldClose(window)) {
// Clear the color and depth buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Send updated info to the GPU
glUniformMatrix4fv( shader.uniform("model"), 1, GL_FALSE, Globals::model.m ); // model transformation (always the identity matrix in this assignment)
glUniformMatrix4fv( shader.uniform("view"), 1, GL_FALSE, Globals::view.m ); // viewing transformation
glUniformMatrix4fv( shader.uniform("projection"), 1, GL_FALSE, Globals::projection.m ); // projection matrix
glUniformMatrix4fv(shader.uniform("model"), 1, GL_FALSE,
Globals::model.m); // model transformation (always the
// identity matrix in this assignment)
glUniformMatrix4fv(shader.uniform("view"), 1, GL_FALSE,
Globals::view.m); // viewing transformation
glUniformMatrix4fv(shader.uniform("projection"), 1, GL_FALSE,
Globals::projection.m); // projection matrix
// Draw
glDrawElements(GL_TRIANGLES, Globals::mesh.faces.size()*3, GL_UNSIGNED_INT, 0);
glDrawElements(GL_TRIANGLES, Globals::mesh.faces.size() * 3,
GL_UNSIGNED_INT, 0);
// Finalize
glfwSwapBuffers(window);
@ -226,33 +273,37 @@ int main(int argc, char *argv[]){
return EXIT_SUCCESS;
}
void init_scene(){
void init_scene() {
using namespace Globals;
// Create the buffer for vertices
glGenBuffers(1, verts_vbo);
glBindBuffer(GL_ARRAY_BUFFER, verts_vbo[0]);
glBufferData(GL_ARRAY_BUFFER, mesh.vertices.size()*sizeof(mesh.vertices[0]), &mesh.vertices[0][0], GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, mesh.vertices.size() * sizeof(mesh.vertices[0]),
&mesh.vertices[0][0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Create the buffer for colors
glGenBuffers(1, colors_vbo);
glBindBuffer(GL_ARRAY_BUFFER, colors_vbo[0]);
glBufferData(GL_ARRAY_BUFFER, mesh.colors.size()*sizeof(mesh.colors[0]), &mesh.colors[0][0], GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, mesh.colors.size() * sizeof(mesh.colors[0]),
&mesh.colors[0][0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Create the buffer for normals
glGenBuffers(1, normals_vbo);
glBindBuffer(GL_ARRAY_BUFFER, normals_vbo[0]);
glBufferData(GL_ARRAY_BUFFER, mesh.normals.size()*sizeof(mesh.normals[0]), &mesh.normals[0][0], GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, mesh.normals.size() * sizeof(mesh.normals[0]),
&mesh.normals[0][0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Create the buffer for indices
glGenBuffers(1, faces_ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, faces_ibo[0]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh.faces.size()*sizeof(mesh.faces[0]), &mesh.faces[0][0], GL_STATIC_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
mesh.faces.size() * sizeof(mesh.faces[0]), &mesh.faces[0][0],
GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
// Create the VAO
@ -264,20 +315,21 @@ void init_scene(){
// location=0 is the vertex
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, verts_vbo[0]);
glVertexAttribPointer(0, vert_dim, GL_FLOAT, GL_FALSE, sizeof(mesh.vertices[0]), 0);
glVertexAttribPointer(0, vert_dim, GL_FLOAT, GL_FALSE,
sizeof(mesh.vertices[0]), 0);
// location=1 is the color
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, colors_vbo[0]);
glVertexAttribPointer(1, vert_dim, GL_FLOAT, GL_FALSE, sizeof(mesh.colors[0]), 0);
glVertexAttribPointer(1, vert_dim, GL_FLOAT, GL_FALSE, sizeof(mesh.colors[0]),
0);
// location=2 is the normal
glEnableVertexAttribArray(2);
glBindBuffer(GL_ARRAY_BUFFER, normals_vbo[0]);
glVertexAttribPointer(2, vert_dim, GL_FLOAT, GL_FALSE, sizeof(mesh.normals[0]), 0);
glVertexAttribPointer(2, vert_dim, GL_FLOAT, GL_FALSE,
sizeof(mesh.normals[0]), 0);
// Done setting data for the vao
glBindVertexArray(0);
}

17
assignment-2b/src/shader.frag
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@ -1,12 +1,12 @@
#version 330 core
layout (location=0) out vec4 out_fragcolor;
layout(location = 0) out vec4 out_fragcolor;
in vec3 position;
in vec3 color;
in vec3 normal;
void main(){
void main() {
// hard code some material properties
float ka = 0.3f;
@ -14,18 +14,19 @@ void main(){
// hard code a static point light source at (0,0,0)
// L is a unit vector from the fragment location towards this light
vec3 L = -1.f*normalize(vec3(position));
vec3 L = -1.f * normalize(vec3(position));
// normalize the input normal that was interpolated from the mesh vertices
vec3 N = normalize(normal);
// compute a simple diffuse shading weight that is agnostic to the order in which the triangle vertices were specified
// compute a simple diffuse shading weight that is agnostic to the order in
// which the triangle vertices were specified
float N_dot_L = dot(N, L);
if ((N_dot_L) < 0.0) { N_dot_L *= -1.0; }
if ((N_dot_L) < 0.0) {
N_dot_L *= -1.0;
}
// use a simplified ambient+diffuse shading model to define the fragment color
vec3 result = ka * color + kd * color * N_dot_L;
out_fragcolor = vec4( result, 1.0 );
out_fragcolor = vec4(result, 1.0);
}

162
assignment-2b/src/shader.hpp
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@ -1,21 +1,26 @@
// Copyright 2016 University of Minnesota
//
// SHADER Uses the BSD 2-Clause License (http://www.opensource.org/licenses/BSD-2-Clause)
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this list of
// SHADER Uses the BSD 2-Clause License
// (http://www.opensource.org/licenses/BSD-2-Clause) Redistribution and use in
// source and binary forms, with or without modification, are permitted provided
// that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of
// conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other materials
// provided with the distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OF MINNESOTA, DULUTH OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list
// of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// UNIVERSITY OF MINNESOTA, DULUTH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Adapted from r3dux (http://r3dux.org).
@ -49,25 +54,28 @@ class Shader {
public:
Shader() : program_id(0) {}
~Shader(){ glDeleteProgram(program_id); }
~Shader() { glDeleteProgram(program_id); }
// Init the shader from files (must create OpenGL context first!)
inline void init_from_files( std::string vertex_file, std::string frag_file );
inline void init_from_files(std::string vertex_file, std::string frag_file);
// Init the shader from strings (must create OpenGL context first!)
inline void init_from_strings( std::string vertex_source, std::string frag_source ){ init(vertex_source, frag_source); }
inline void init_from_strings(std::string vertex_source,
std::string frag_source) {
init(vertex_source, frag_source);
}
// Be sure to initialize the shader before enabling it
inline void enable();
// Not really needed, but nice for readability
inline void disable(){ glUseProgram(0); }
inline void disable() { glUseProgram(0); }
// Returns the bound location of a named attribute
inline GLuint attribute( const std::string name );
inline GLuint attribute(const std::string name);
// Returns the bound location of a named uniform
inline GLuint uniform( const std::string name );
inline GLuint uniform(const std::string name);
private:
GLuint program_id;
@ -78,44 +86,49 @@ private:
std::unordered_map<std::string, GLuint> uniforms;
// Initialize the shader, called by init_from_*
inline void init( std::string vertex_source, std::string frag_source );
inline void init(std::string vertex_source, std::string frag_source);
// Compiles the shader, called by init
inline GLuint compile( std::string shaderSource, GLenum type );
inline GLuint compile(std::string shaderSource, GLenum type);
}; // end of shader
//
// Implementation
//
GLuint Shader::compile( std::string source, GLenum type ){
GLuint Shader::compile(std::string source, GLenum type) {
// Generate a shader id
// Note: Shader id will be non-zero if successfully created.
GLuint shaderId = glCreateShader(type);
if( shaderId == 0 ){ throw std::runtime_error("\n**glCreateShader Error"); }
if (shaderId == 0) {
throw std::runtime_error("\n**glCreateShader Error");
}
// Attach the GLSL source code and compile the shader
const char *shaderchar = source.c_str();
glShaderSource(shaderId, 1, &shaderchar, NULL);
glCompileShader(shaderId);
// Check the compilation status and throw a runtime_error if shader compilation failed
// Check the compilation status and throw a runtime_error if shader
// compilation failed
GLint shaderStatus;
glGetShaderiv(shaderId, GL_COMPILE_STATUS, &shaderStatus);
if( shaderStatus == GL_FALSE ){ throw std::runtime_error("\n**glCompileShader Error"); }
if (shaderStatus == GL_FALSE) {
throw std::runtime_error("\n**glCompileShader Error");
}
return shaderId;
}
void Shader::init(std::string vertex_source, std::string frag_source){
void Shader::init(std::string vertex_source, std::string frag_source) {
// Create the resource
program_id = glCreateProgram();
if( program_id == 0 ){ throw std::runtime_error("\n**glCreateProgram Error"); }
if (program_id == 0) {
throw std::runtime_error("\n**glCreateProgram Error");
}
glUseProgram(program_id);
// Compile the shaders and return their id values
@ -127,74 +140,91 @@ void Shader::init(std::string vertex_source, std::string frag_source){
glAttachShader(program_id, fragment_id);
glLinkProgram(program_id);
// Once the shader program has the shaders attached and linked, the shaders are no longer required.
// If the linking failed, then we're going to abort anyway so we still detach the shaders.
// Once the shader program has the shaders attached and linked, the shaders
// are no longer required. If the linking failed, then we're going to abort
// anyway so we still detach the shaders.
glDetachShader(program_id, vertex_id);
glDetachShader(program_id, fragment_id);
// Check the program link status and throw a runtime_error if program linkage failed.
// Check the program link status and throw a runtime_error if program linkage
// failed.
GLint programLinkSuccess = GL_FALSE;
glGetProgramiv(program_id, GL_LINK_STATUS, &programLinkSuccess);
if( programLinkSuccess != GL_TRUE ){ throw std::runtime_error("\n**Shader Error: Problem with link"); }
if (programLinkSuccess != GL_TRUE) {
throw std::runtime_error("\n**Shader Error: Problem with link");
}
// Check the validation status and throw a runtime_error if program validation failed.
// Does NOT work with corearb headers???
// glValidateProgram(program_id);
// GLint programValidatationStatus;
// glGetProgramiv(program_id, GL_VALIDATE_STATUS, &programValidatationStatus);
// if( programValidatationStatus != GL_TRUE ){ throw std::runtime_error("\n**Shader Error: Problem with validation"); }
// Check the validation status and throw a runtime_error if program validation
// failed. Does NOT work with corearb headers???
// glValidateProgram(program_id);
// GLint programValidatationStatus;
// glGetProgramiv(program_id, GL_VALIDATE_STATUS,
//&programValidatationStatus); if( programValidatationStatus != GL_TRUE ){
//throw std::runtime_error("\n**Shader Error: Problem with validation"); }
glUseProgram(0);
}
void Shader::init_from_files( std::string vertex_file, std::string frag_file ){
void Shader::init_from_files(std::string vertex_file, std::string frag_file) {
std::string vert_string, frag_string;
// Load the vertex shader
std::ifstream vert_in( vertex_file, std::ios::in | std::ios::binary );
if( vert_in ){ vert_string = (std::string((std::istreambuf_iterator<char>(vert_in)), std::istreambuf_iterator<char>())); }
else{ throw std::runtime_error("\n**Shader Error: failed to load \""+vertex_file+"\"" ); }
std::ifstream vert_in(vertex_file, std::ios::in | std::ios::binary);
if (vert_in) {
vert_string = (std::string((std::istreambuf_iterator<char>(vert_in)),
std::istreambuf_iterator<char>()));
} else {
throw std::runtime_error("\n**Shader Error: failed to load \"" +
vertex_file + "\"");
}
// Load the fragement shader
std::ifstream frag_in( frag_file, std::ios::in | std::ios::binary );
if( frag_in ){ frag_string = (std::string((std::istreambuf_iterator<char>(frag_in)), std::istreambuf_iterator<char>())); }
else{ throw std::runtime_error("\n**Shader Error: failed to load \""+frag_file+"\"" ); }
std::ifstream frag_in(frag_file, std::ios::in | std::ios::binary);
if (frag_in) {
frag_string = (std::string((std::istreambuf_iterator<char>(frag_in)),
std::istreambuf_iterator<char>()));
} else {
throw std::runtime_error("\n**Shader Error: failed to load \"" + frag_file +
"\"");
}
init( vert_string, frag_string );
init(vert_string, frag_string);
}
void Shader::enable(){
if( program_id!=0 ){ glUseProgram(program_id); }
else{ throw std::runtime_error("\n**Shader Error: Can't enable, not initialized"); }
void Shader::enable() {
if (program_id != 0) {
glUseProgram(program_id);
} else {
throw std::runtime_error("\n**Shader Error: Can't enable, not initialized");
}
}
GLuint Shader::attribute(const std::string name){
GLuint Shader::attribute(const std::string name) {
// Add the attribute to the map table if it doesn't already exist
if( attributes.count(name)==0 ){
attributes[name] = glGetAttribLocation( program_id, name.c_str() );
if( attributes[name] == -1 ){ throw std::runtime_error("\n**Shader Error: bad attribute ("+name+")"); }
if (attributes.count(name) == 0) {
attributes[name] = glGetAttribLocation(program_id, name.c_str());
if (attributes[name] == -1) {
throw std::runtime_error("\n**Shader Error: bad attribute (" + name +
")");
}
}
return attributes[name];
}
GLuint Shader::uniform(const std::string name){
GLuint Shader::uniform(const std::string name) {
// Add the uniform to the map table if it doesn't already exist
if( uniforms.count(name)==0 ){
uniforms[name] = glGetUniformLocation( program_id, name.c_str() );
if( uniforms[name] == -1 ){ throw std::runtime_error("\n**Shader Error: bad uniform ("+name+")"); }
if (uniforms.count(name) == 0) {
uniforms[name] = glGetUniformLocation(program_id, name.c_str());
if (uniforms[name] == -1) {
throw std::runtime_error("\n**Shader Error: bad uniform (" + name + ")");
}
}
return uniforms[name];
}
} // end namespace mcl
#endif

24
assignment-2b/src/shader.vert
View file

@ -1,8 +1,8 @@
#version 330 core
layout(location=0) in vec4 in_position;
layout(location=1) in vec3 in_color;
layout(location=2) in vec3 in_normal;
layout(location = 0) in vec4 in_position;
layout(location = 1) in vec3 in_color;
layout(location = 2) in vec3 in_normal;
out vec3 position;
out vec3 color;
@ -12,16 +12,22 @@ uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
// pass the vertex color and normal information to the fragment shader (without any modification)
void main() {
// pass the vertex color and normal information to the fragment shader
// (without any modification)
color = in_color;
normal = in_normal;
// determine what the vertex position will be after the model transformation and pass that information to the fragment shader, for use in the illumination calculations
// in our case the model transformation is the identity matrix so this isn't actually necessary, but it's included here for completeness. Note that the vectors needed for the lighting calculations must be computed using the vertex locations *without* perspective warp applied
// determine what the vertex position will be after the model transformation
// and pass that information to the fragment shader, for use in the
// illumination calculations in our case the model transformation is the
// identity matrix so this isn't actually necessary, but it's included here
// for completeness. Note that the vectors needed for the lighting
// calculations must be computed using the vertex locations *without*
// perspective warp applied
position = vec3(model * in_position);
// apply the model, view, and projection transformations to the vertex position value that will be sent to the clipper, rasterizer, ...
// apply the model, view, and projection transformations to the vertex
// position value that will be sent to the clipper, rasterizer, ...
gl_Position = (projection * view * model * in_position);
}

268
assignment-2b/src/trimesh.hpp
View file

@ -1,31 +1,36 @@
// Copyright 2016 University of Minnesota
//
// TRIMESH Uses the BSD 2-Clause License (http://www.opensource.org/licenses/BSD-2-Clause)
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this list of
// TRIMESH Uses the BSD 2-Clause License
// (http://www.opensource.org/licenses/BSD-2-Clause) Redistribution and use in
// source and binary forms, with or without modification, are permitted provided
// that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of
// conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other materials
// provided with the distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OF MINNESOTA, DULUTH OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list
// of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// UNIVERSITY OF MINNESOTA, DULUTH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef TRIMESH_HPP
#define TRIMESH_HPP 1
#include <fstream>
#include <sstream>
#include <vector>
#include <cassert>
#include <cmath>
#include <fstream>
#include <iostream>
#include <sstream>
#include <vector>
//
// Vector Class
@ -34,51 +39,76 @@
template <size_t D, class T> class Vec {
public:
// Constructors
Vec(){ data[0]=T(0); data[1]=T(0); data[2]=T(0); }
Vec(T x_, T y_, T z_){ data[0]=x_; data[1]=y_; data[2]=z_; }
Vec() {
data[0] = T(0);
data[1] = T(0);
data[2] = T(0);
}
Vec(T x_, T y_, T z_) {
data[0] = x_;
data[1] = y_;
data[2] = z_;
}
// Data
T data[3];
// Functions
T operator[](int i) const { return data[i]; }
T& operator[](int i){ return data[i]; }
Vec<D,T> &operator += (const Vec<D,T> &x) {
for(size_t i=0; i<D; ++i){ data[i] += x[i]; }
T &operator[](int i) { return data[i]; }
Vec<D, T> &operator+=(const Vec<D, T> &x) {
for (size_t i = 0; i < D; ++i) {
data[i] += x[i];
}
return *this;
}
double len2() const { return this->dot(*this); } // squared length
double len() const { return sqrt(len2()); } // length
T dot(const Vec<D,T> &v) const {
T dot(const Vec<D, T> &v) const {
T r(0);
for(size_t i=0; i<D; ++i){ r += v[i] * data[i]; }
for (size_t i = 0; i < D; ++i) {
r += v[i] * data[i];
}
return r;
}
Vec<3,T> cross(const Vec<3,T> &v) const {
Vec<3, T> cross(const Vec<3, T> &v) const {
assert(D == 3); // only defined for 3 dims
return Vec<3,T>(data[1]*v[2] - data[2]*v[1], data[2]*v[0] - data[0]*v[2], data[0]*v[1] - data[1]*v[0]);
return Vec<3, T>(data[1] * v[2] - data[2] * v[1],
data[2] * v[0] - data[0] * v[2],
data[0] * v[1] - data[1] * v[0]);
}
void normalize() {
double l = len(); if( l<=0.0 ){ return; }
for(size_t i=0; i<D; ++i){ data[i] = data[i] / l; }
double l = len();
if (l <= 0.0) {
return;
}
for (size_t i = 0; i < D; ++i) {
data[i] = data[i] / l;
}
}
};
template <size_t D, class T> static inline const Vec<D,T> operator-(const Vec<D,T> &v1, const Vec<D,T> &v2){
Vec<D,T> r;
for(size_t i=0; i<D; ++i){ r[i] = v1[i]-v2[i]; }
template <size_t D, class T>
static inline const Vec<D, T> operator-(const Vec<D, T> &v1,
const Vec<D, T> &v2) {
Vec<D, T> r;
for (size_t i = 0; i < D; ++i) {
r[i] = v1[i] - v2[i];
}
return r;
}
template <size_t D, class T> static inline const Vec<D,T> operator*(const Vec<D,T> &v, const T &x){
Vec<D,T> r;
for (size_t i=0; i<D; ++i){ r[i] = v[i]*x; }
template <size_t D, class T>
static inline const Vec<D, T> operator*(const Vec<D, T> &v, const T &x) {
Vec<D, T> r;
for (size_t i = 0; i < D; ++i) {
r[i] = v[i] * x;
}
return r;
}
typedef Vec<3,float> Vec3f;
typedef Vec<3,int> Vec3i;
typedef Vec<3, float> Vec3f;
typedef Vec<3, int> Vec3i;
//
// Triangle Mesh Class
@ -92,68 +122,84 @@ public:
// Compute normals if not loaded from obj
// or if recompute is set to true.
void need_normals( bool recompute=false );
void need_normals(bool recompute = false);
// Sets a default vertex color if
// they haven't been set.
void need_colors( Vec3f default_color = Vec3f(0.4,0.4,0.4) );
void need_colors(Vec3f default_color = Vec3f(0.4, 0.4, 0.4));
// Loads an OBJ file
bool load_obj( std::string file );
bool load_obj(std::string file);
// Prints details about the mesh
void print_details();
};
//
// Implementation
//
void TriMesh::print_details(){
void TriMesh::print_details() {
std::cout << "Vertices: " << vertices.size() << std::endl;
std::cout << "Normals: " << normals.size() << std::endl;
std::cout << "Colors: " << colors.size() << std::endl;
std::cout << "Faces: " << faces.size() << std::endl;
}
void TriMesh::need_normals( bool recompute ){
if( vertices.size() == normals.size() && !recompute ){ return; }
if( normals.size() != vertices.size() ){ normals.resize( vertices.size() ); }
void TriMesh::need_normals(bool recompute) {
if (vertices.size() == normals.size() && !recompute) {
return;
}
if (normals.size() != vertices.size()) {
normals.resize(vertices.size());
}
std::cout << "Computing TriMesh normals" << std::endl;
const int nv = normals.size();
for( int i = 0; i < nv; ++i ){ normals[i][0] = 0.f; normals[i][1] = 0.f; normals[i][2] = 0.f; }
for (int i = 0; i < nv; ++i) {
normals[i][0] = 0.f;
normals[i][1] = 0.f;
normals[i][2] = 0.f;
}
int nf = faces.size();
for( int f = 0; f < nf; ++f ){
for (int f = 0; f < nf; ++f) {
Vec3i face = faces[f];
const Vec3f &p0 = vertices[ face[0] ];
const Vec3f &p1 = vertices[ face[1] ];
const Vec3f &p2 = vertices[ face[2] ];
Vec3f a = p0-p1, b = p1-p2, c = p2-p0;
const Vec3f &p0 = vertices[face[0]];
const Vec3f &p1 = vertices[face[1]];
const Vec3f &p2 = vertices[face[2]];
Vec3f a = p0 - p1, b = p1 - p2, c = p2 - p0;
float l2a = a.len2(), l2b = b.len2(), l2c = c.len2();
if (!l2a || !l2b || !l2c){ continue; } // check for zeros or nans
Vec3f facenormal = a.cross( b );
if (!l2a || !l2b || !l2c) {
continue;
} // check for zeros or nans
Vec3f facenormal = a.cross(b);
normals[faces[f][0]] += facenormal * (1.0f / (l2a * l2c));
normals[faces[f][1]] += facenormal * (1.0f / (l2b * l2a));
normals[faces[f][2]] += facenormal * (1.0f / (l2c * l2b));
}
for (int i = 0; i < nv; i++){ normals[i].normalize(); }
for (int i = 0; i < nv; i++) {
normals[i].normalize();
}
} // end need normals
void TriMesh::need_colors( Vec3f default_color ){
if( vertices.size() == colors.size() ){ return; }
else{ colors.resize( vertices.size(), default_color ); }
void TriMesh::need_colors(Vec3f default_color) {
if (vertices.size() == colors.size()) {
return;
} else {
colors.resize(vertices.size(), default_color);
}
} // end need colors
// Function to split a string into multiple strings, seperated by delimeter
static void split_str( char delim, const std::string &str, std::vector<std::string> *result ){
std::stringstream ss(str); std::string s;
while( std::getline(ss, s, delim) ){ result->push_back(s); }
static void split_str(char delim, const std::string &str,
std::vector<std::string> *result) {
std::stringstream ss(str);
std::string s;
while (std::getline(ss, s, delim)) {
result->push_back(s);
}
}
bool TriMesh::load_obj( std::string file ){
bool TriMesh::load_obj(std::string file) {
std::cout << "\nLoading " << file << std::endl;
@ -173,100 +219,109 @@ bool TriMesh::load_obj( std::string file ){
//
// First loop, make buffers
//
std::ifstream infile( file.c_str() );
if( infile.is_open() ){
std::ifstream infile(file.c_str());
if (infile.is_open()) {
std::string line;
while( std::getline( infile, line ) ){
while (std::getline(infile, line)) {
std::stringstream ss(line);
std::string tok; ss >> tok;
std::string tok;
ss >> tok;
// Vertex
if( tok == "v" ){
if (tok == "v") {
// First three location
float x, y, z; ss >> x >> y >> z;
temp_verts.push_back( Vec3f(x,y,z) );
float x, y, z;
ss >> x >> y >> z;
temp_verts.push_back(Vec3f(x, y, z));
// Next three colors
float cx, cy, cz;
if( ss >> cx >> cy >> cz ){
temp_colors.push_back( Vec3f(cx,cy,cz) );
if (ss >> cx >> cy >> cz) {
temp_colors.push_back(Vec3f(cx, cy, cz));
} else {
temp_colors.push_back( Vec3f(0.3f,0.3f,0.3f) );
temp_colors.push_back(Vec3f(0.3f, 0.3f, 0.3f));
}
}
// Normal
if( tok == "vn" ){
float x, y, z; ss >> x >> y >> z;
temp_normals.push_back( Vec3f(x,y,z) );
if (tok == "vn") {
float x, y, z;
ss >> x >> y >> z;
temp_normals.push_back(Vec3f(x, y, z));
}
} // end loop lines
} // end load obj
else { std::cerr << "\n**TriMesh::load_obj Error: Could not open file " << file << std::endl; return false; }
else {
std::cerr << "\n**TriMesh::load_obj Error: Could not open file " << file
<< std::endl;
return false;
}
//
// Second loop, make faces
//
std::ifstream infile2( file.c_str() );
if( infile2.is_open() ){
std::ifstream infile2(file.c_str());
if (infile2.is_open()) {
std::string line;
while( std::getline( infile2, line ) ){
while (std::getline(infile2, line)) {
std::stringstream ss(line);
std::string tok; ss >> tok;
std::string tok;
ss >> tok;
// Face
if( tok == "f" ){
if (tok == "f") {
Vec3i face;
// Get the three vertices
for( size_t i=0; i<3; ++i ){
for (size_t i = 0; i < 3; ++i) {
std::string f_str; ss >> f_str;
std::string f_str;
ss >> f_str;
std::vector<std::string> f_vals;
split_str( '/', f_str, &f_vals );
assert(f_vals.size()>0);
split_str('/', f_str, &f_vals);
assert(f_vals.size() > 0);
face[i] = vertices.size();
int v_idx = std::stoi(f_vals[0])-1;
vertices.push_back( temp_verts[v_idx] );
colors.push_back( temp_colors[v_idx] );
int v_idx = std::stoi(f_vals[0]) - 1;
vertices.push_back(temp_verts[v_idx]);
colors.push_back(temp_colors[v_idx]);
// Check for normal
if( f_vals.size()>2 ){
int n_idx = std::stoi(f_vals[2])-1;
normals.push_back( temp_normals[n_idx] );
if (f_vals.size() > 2) {
int n_idx = std::stoi(f_vals[2]) - 1;
normals.push_back(temp_normals[n_idx]);
}
}
faces.push_back(face);
// If it's a quad, make another triangle
std::string last_vert="";
if( ss >> last_vert ){
std::string last_vert = "";
if (ss >> last_vert) {
Vec3i face2;
face2[0] = face[0];
face2[1] = face[2];
std::vector<std::string> f_vals;
split_str( '/', last_vert, &f_vals );
assert(f_vals.size()>0);
split_str('/', last_vert, &f_vals);
assert(f_vals.size() > 0);
int v_idx = std::stoi(f_vals[0])-1;
vertices.push_back( temp_verts[v_idx] );
colors.push_back( temp_colors[v_idx] );
int v_idx = std::stoi(f_vals[0]) - 1;
vertices.push_back(temp_verts[v_idx]);
colors.push_back(temp_colors[v_idx]);
face2[2] = vertices.size();
// Check for normal
if( f_vals.size()>2 ){
int n_idx = std::stoi(f_vals[2])-1;
normals.push_back( temp_normals[n_idx] );
if (f_vals.size() > 2) {
int n_idx = std::stoi(f_vals[2]) - 1;
normals.push_back(temp_normals[n_idx]);
}
faces.push_back(face2);
@ -279,8 +334,9 @@ bool TriMesh::load_obj( std::string file ){
} // end load obj
// Make sure we have normals
if( !normals.size() ){
std::cout << "**Warning: normals not loaded so we'll compute them instead." << std::endl;
if (!normals.size()) {
std::cout << "**Warning: normals not loaded so we'll compute them instead."
<< std::endl;
need_normals();
}
@ -288,6 +344,4 @@ bool TriMesh::load_obj( std::string file ){
} // end load obj
#endif