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#include <glad/glad.h>
#include <iostream>
#include <GLFW/glfw3.h>
const char *vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0";
const char *fragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"\n"
"void main()\n"
"{\n"
" FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\0";
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow *window);
int main()
{
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(
800,
600,
"My OpenGL project",
NULL,
NULL
);
if (window == NULL) {
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// вершины фигуры
float vertices[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.5f, 0.5f, 0.0f,
-0.5f, 0.5f, 0.0f
};
unsigned int indices[] = {
0, 1, 2, // первый треугольник
2, 3, 0 // второй треугольник
};
// ШЕЙДЕРЫ
unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
int success, success_vertex, success_fragment;
char infoLog[512];
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success_vertex);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success_fragment);
// проверка компиляции шейдеров
if (!success_vertex) {
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"
<< infoLog << std::endl;
} else if (!success_fragment) {
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n"
<< infoLog << std::endl;
}
// линкуем шейдеры к программному объекту
unsigned int shaderProgram;
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
std::cout << "ERROR::PROGRAM::LINKING_FAILED\n" << infoLog
<< std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
// ИНИЦИАЛИЗАЦИЯ VAO
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(
GL_ARRAY_BUFFER,
sizeof(vertices),
vertices,
GL_STATIC_DRAW
);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(
GL_ELEMENT_ARRAY_BUFFER,
sizeof(indices),
indices,
GL_STATIC_DRAW
);
glVertexAttribPointer(
0,
3,
GL_FLOAT,
GL_FALSE,
3 * sizeof(float),
(void*)0
);
glEnableVertexAttribArray(0);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
while (!glfwWindowShouldClose(window)) {
processInput(window);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
/* glDrawArrays(GL_TRIANGLES, 0, 3); */
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
/* glBindVertexArray(0); */
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
}
void processInput(GLFWwindow *window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
}
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