PACKAGES MAY BE USED
- GL3W - For modern OpenGL methods
- GLFW - Window creation and management
- GLM - Maths calculations
- stb_image - Image loading
- TinyOBJLoader - Obj loading
- TinyEXR - EXR file saving
- ImGui - UI rendering
- tinyfiledialogs - Call native file dialog (require Zenity on linux)
DENOISE:
https://github.com/OpenImageDenoise/oidn
LINUX PLATFORM
cmake_minimum_required(VERSION 2.8)
project(CP_01) set(GLFW_HOME /home/gearslogy/Plugin_dev/opengl/GLEXT)
include_directories(${GLFW_HOME}/include/)
link_directories(${GLFW_HOME}/lib/) find_package(OpenGL REQUIRED)
include_directories(${OpenGL_INCLUDE_DIRS})
link_directories(${OpenGL_LIBRARY_DIRS})
add_definitions(${OpenGL_DEFINITIONS})
if(NOT OPENGL_FOUND)
message(ERROR " OPENGL not found!")
endif(NOT OPENGL_FOUND) add_executable(CP_01 main.cpp)
target_link_libraries(CP_01 glfw GLEW)
//
// Created by gearslogy on 11/1/18.
// #include <GL/glew.h>
#include <GL/gl.h>
#include <GLFW/glfw3.h> enum VAO_IDs {Triangles ,NumVAOs};
enum Buffer_IDs{ArrayBuffer,NumBuffers};
enum Attrib_IDS{vPosition=}; GLuint VAOs[NumVAOs];
GLuint Buffers[NumBuffers]; const GLuint NumVertices = ; void init(void){ static const GLfloat vertices[NumVertices][] = {
{-0.90f, -0.90f},
{0.85f, -0.90f},
{-0.90f, 0.85f}, {0.90f, -0.85f},
{0.90f, 0.90f},
{-0.85f, 0.90f},
}; glCreateBuffers(NumBuffers,Buffers);
glNamedBufferStorage(Buffers[ArrayBuffer],sizeof(vertices),vertices,); glGenVertexArrays(NumVAOs,VAOs);
glBindVertexArray(VAOs[Triangles]);
glBindBuffer(GL_ARRAY_BUFFER,Buffers[ArrayBuffer]);
glVertexAttribPointer(vPosition,,GL_FLOAT,GL_FALSE,,);
glEnableVertexAttribArray(vPosition); } void display(void){
static const float black[] = {0.0f,0.0f,0.0f,0.0f};
glClearBufferfv(GL_COLOR,,black);
glBindVertexArray(VAOs[Triangles]);
glDrawArrays(GL_TRIANGLES, ,NumVertices);
} int main(){
glfwInit(); GLFWwindow *window =glfwCreateWindow(,,"Triangles",NULL,NULL);
glfwMakeContextCurrent(window);
glewInit();
init(); while(!glfwWindowShouldClose(window)){
display();
glfwSwapBuffers(window);
glfwPollEvents();
} glfwDestroyWindow(window);
glfwTerminate();
}
WINDOWS PLATFORM，VC2019, 全部静态链接
Windows CMakelists:
cmake_minimum_required(VERSION 3.5) project(Triangle) set(CMAKE_CXX_STANDARD )
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# OPENGL
find_package(OpenGL REQUIRED)
include_directories(${OpenGL_INCLUDE_DIRS})
link_directories(${OpenGL_LIBRARY_DIRS})
add_definitions(${OpenGL_DEFINITIONS}) if(NOT OPENGL_FOUND)
message(ERROR " OPENGL not found!")
endif(NOT OPENGL_FOUND) # GLEW
set(GLEW_HOME D:/plugin_dev/libs/glew-2.1.)
include_directories(${GLEW_HOME}/include)
link_directories(${GLEW_HOME}/lib/Release/x64) # GLFW
set(GLFW_HOME D:/plugin_dev/libs/glfw-3.3..bin.WIN64)
include_directories(${GLFW_HOME}/include/)
link_directories(${GLFW_HOME}/lib-vc2019) add_executable(Triangle main.cpp)
target_link_libraries(Triangle glew32s glfw3 opengl32)
在win32平台一定要显式的写出opengl32链接库。原因来自：这里
统统设置STATIC
#define GLEW_STATIC
// GLEW #include <GL/glew.h>
#include <cstdlib>
#undef GLFW_DLL
// GLFW
#include <GLFW/glfw3.h>
2,simple vertex shader & fragment shader
trangles.vert:
#version core layout (location =) in vec4 vPosition;
void main()
{
gl_Position = vec4(vPosition.x, vPosition.y, vPosition.z, 1.0);
}
trangles.frag:
#version core
layout (location =) out vec4 FragColor;
void main(){ FragColor = vec4(,,,1.0);
}
loadshader.h
//
// Created by gearslogy on 11/2/18.
// #ifndef CP_01_LOADSHADER_H
#define CP_01_LOADSHADER_H #include <string>
#include <iostream>
#include <fstream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <vector>
#include <algorithm> using namespace std;
class FileIO
{
public:
static string load(const char *path){
ifstream in;
in.open(path,ios::in);
if(!in.is_open())
cout << "read " << path << " error\n"; string temp; string line;
while(getline(in,line)){
temp += line;
temp += "\n";
} in.close();
return temp;
}
}; void ApplyShaders(GLuint &shaderProgram,
const vector<string> &codes,
const vector<GLenum> shaderTypes )
{
if(codes.size()!=shaderTypes.size())
{
cout << "shader src size not match type size\n";
return ;
} // FOR LOG
int success;
char infoLog[]; vector <GLuint> shaders;
for(int i=;i<codes.size();i++){
GLuint shader = glCreateShader(shaderTypes[i]);
cout << "Shader ID :" << shader <<endl;
const char *code = codes[i].c_str();
glShaderSource(shader, , &code, NULL);
glCompileShader(shader);
// check compile error
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(shader, , NULL, infoLog);
std::cout << "ERROR::COMPILATION_FAILED\n" << infoLog << std::endl;
}
glAttachShader(shaderProgram, shader);
// append shader to vector to delete later
} glLinkProgram(shaderProgram);
// check for linking errors
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shaderProgram, , NULL, infoLog);
std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
} //glDeleteShader(vertexShader);
//glDeleteShader(fragmentShader); glUseProgram(shaderProgram);
for(int i=;i<shaders.size();i++)
glDeleteShader(shaders[i]); } #endif //CP_01_LOADSHADER_H
main.cpp:
#include <GL/glew.h>
#include <GL/gl.h> #include <GLFW/glfw3.h>
#include <iostream>
#include "loadshader.h"
#define BUFFER_OFFSET(offset) ((void *)(offset)) using namespace std;
enum VAO_IDs {Triangles ,NumVAOs}; // NumVAOs 1
enum Buffer_IDs{ArrayBuffer,NumBuffers};
enum Attrib_IDS{vPosition=}; GLuint VAOs[NumVAOs];
GLuint Buffers[NumBuffers]; const GLuint NumVertices = ; void init(void){ static const GLfloat vertices[NumVertices][] = {
{-0.90f, -0.90f},
{0.85f, -0.90f},
{-0.90f, 0.85f}, {0.90f, -0.85f},
{0.90f, 0.90f},
{-0.85f, 0.90f},
};
glCreateVertexArrays(NumVAOs,VAOs);//glGenVertexArrays(NumVAOs,VAOs);
cout << "CreateVertexArrays VAOs[0]: "<<VAOs[] << endl; glCreateBuffers(NumBuffers,Buffers);
cout << "CreateVertexArrays Buffers[0]: "<<Buffers[] << endl; glNamedBufferStorage(Buffers[ArrayBuffer],sizeof(vertices),vertices,); const char *vertexShaderSource = FileIO::load("../triangles.vert").c_str();
const char *fragmentShaderSource = FileIO::load("../triangles.frag").c_str(); unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, , &vertexShaderSource, NULL);
glCompileShader(vertexShader); int success;
char infoLog[];
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, , NULL, infoLog);
std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
} unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, , &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, , NULL, infoLog);
std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
} unsigned int shaderProgram;
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram); // check for linking errors
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shaderProgram, , NULL, infoLog);
std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
} glUseProgram(shaderProgram);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader); glBindVertexArray(VAOs[Triangles]);
glBindBuffer(GL_ARRAY_BUFFER,Buffers[ArrayBuffer]);
glVertexAttribPointer(,,GL_FLOAT,GL_FALSE, * sizeof(float),BUFFER_OFFSET());
glEnableVertexAttribArray(); } void display(void){
static const float black[] = {0.0f,0.5f,0.0f,0.0f};
glClearBufferfv(GL_COLOR,,black);
glBindVertexArray(VAOs[Triangles]);
glDrawArrays(GL_TRIANGLES, ,NumVertices); } int main(){
glfwInit(); GLFWwindow *window =glfwCreateWindow(,,"Triangles",NULL,NULL);
glfwMakeContextCurrent(window);
glewInit();
init(); while(!glfwWindowShouldClose(window)){
display();
glfwSwapBuffers(window);
glfwPollEvents();
} glfwDestroyWindow(window);
glfwTerminate();
}
replace main.cpp shader's methods then use the loadshader.h ApplyShaders:
main.cpp:
//
// Created by gearslogy on 11/1/18.
// #include <GL/glew.h>
#include <GL/gl.h> #include <GLFW/glfw3.h>
#include <iostream>
#include "loadshader.h"
#define BUFFER_OFFSET(offset) ((void *)(offset)) using namespace std;
enum VAO_IDs {Triangles ,NumVAOs}; // NumVAOs 1
enum Buffer_IDs{ArrayBuffer,NumBuffers};
enum Attrib_IDS{vPosition=}; GLuint VAOs[NumVAOs];
GLuint Buffers[NumBuffers]; const GLuint NumVertices = ; void init(void){ static const GLfloat vertices[NumVertices][] = {
{-0.90f, -0.90f},
{0.85f, -0.90f},
{-0.90f, 0.85f}, {0.90f, -0.85f},
{0.90f, 0.90f},
{-0.85f, 0.90f},
};
glCreateVertexArrays(NumVAOs,VAOs);//glGenVertexArrays(NumVAOs,VAOs);
cout << "CreateVertexArrays VAOs[0]: "<<VAOs[] << endl; glCreateBuffers(NumBuffers,Buffers);
cout << "CreateVertexArrays Buffers[0]: "<<Buffers[] << endl; glNamedBufferStorage(Buffers[ArrayBuffer],sizeof(vertices),vertices,); vector <string> codes;
vector <GLenum> shaderTypes;
codes.push_back(FileIO::load("../triangles.vert"));
codes.push_back(FileIO::load("../triangles.frag"));
shaderTypes.push_back(GL_VERTEX_SHADER);
shaderTypes.push_back(GL_FRAGMENT_SHADER); GLuint shaderProgram = glCreateProgram();
ApplyShaders(shaderProgram,codes,shaderTypes); glBindVertexArray(VAOs[Triangles]);
glBindBuffer(GL_ARRAY_BUFFER,Buffers[ArrayBuffer]);
glVertexAttribPointer(,,GL_FLOAT,GL_FALSE, * sizeof(float),BUFFER_OFFSET());
glEnableVertexAttribArray(); } void display(void){
static const float black[] = {0.0f,0.5f,0.0f,0.0f};
glClearBufferfv(GL_COLOR,,black);
glBindVertexArray(VAOs[Triangles]);
glDrawArrays(GL_TRIANGLES, ,NumVertices); } int main(){
glfwInit(); GLFWwindow *window =glfwCreateWindow(,,"Triangles",NULL,NULL);
glfwMakeContextCurrent(window);
glewInit();
init(); while(!glfwWindowShouldClose(window)){
display();
glfwSwapBuffers(window);
glfwPollEvents();
} glfwDestroyWindow(window);
glfwTerminate();
}