Dlaczego nie mogę obrócić obiektu o 90 stopni?

Question

Cześć mam taki problem, próbuję obrócić w OpenGL obiekty o 90 stopni i wszystko robię tak jak na stronie https://learnopengl.com/Getting-started/Transformations obrócony obiekt wygląda tak jak na zdjęciu. Nie mam pojęcia co może być tego przyczyną,  w glUniformMatrixfv próbowałem użyć GL_TRUE, ale to dało tylko tyle, że obiekt był tak samo obrócony tylko w inną stronę. Zamieniałem też kolejność: najpierw skalowałem obiekt, a potem rotowałem go wokół osi Z ale to też nic nie dało. Jak to naprawić i dlaczego tak się dzieje?

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <glm.hpp>
#include <gtc/matrix_transform.hpp>
#include <gtc/type_ptr.hpp>

#include <iostream>
#include <fstream>
#include <string>

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

static unsigned int CompileShader(unsigned int type, std::string source)
{
    unsigned int id = glCreateShader(type);
    const char* src = source.c_str();
    glShaderSource(id, 1, &src, nullptr);
    glCompileShader(id);

    int result;
    glGetShaderiv(id, GL_COMPILE_STATUS, &result);
    if (result == GL_FALSE)
    {
        int length;
        glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length); // Końcókwa iv oznacza  typ shaderów "i" od intiger "v" od vector
        char* message = (char*)_malloca(length * sizeof(char));
        glGetShaderInfoLog(id, length, &length, message);
        std::cout << "Failed to compile " << (type == GL_VERTEX_SHADER ? "vertex" : "fragment") << "shader" << std::endl;
        std::cout << message << std::endl;
        glDeleteShader(id);

        return 0;

    }

    return id;
}

static unsigned int CreateShader(const std::string& vertexShader, const std::string fragmentShader)
{
    unsigned int program = glCreateProgram();
    unsigned int vs = CompileShader(GL_VERTEX_SHADER, vertexShader);
    unsigned int fs = CompileShader(GL_FRAGMENT_SHADER, fragmentShader);

    glAttachShader(program, vs);
    glAttachShader(program, fs);
    glLinkProgram(program);

    glDeleteShader(vs);
    glDeleteShader(fs);

    return program;
}

std::string readFromFile(const char* pathToFile)
{
    std::string content;
    std::ifstream fileStream(pathToFile, std::ios::in);

    if (!fileStream.is_open()) {
        std::cerr << "Could not read file " << pathToFile << ". File does not exist." << std::endl;
        return "";
    }

    std::string line;
    while (std::getline(fileStream, line)) {
        content.append(line + "\n");
    }

    fileStream.close();
    std::cout << content << std::endl;
    return content;
}

int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);
    glfwSwapInterval(5);

    if (glewInit() != GLEW_OK)
        std::cout << "Error" << std::endl;

    std::cout << glGetString(GL_VERSION) << std::endl;

    float vertices[] = {
         0.5f,  0.5f, 0.0f,      1.0f, 0.0f, 0.0f,       1.0f, 1.0f,
         0.5f, -0.5f, 0.0f,      0.0f, 1.0f, 0.0f,       1.0f, 0.0f,
        -0.5f, -0.5f, 0.0f,      0.0f, 0.0f, 1.0f,       0.0f, 0.0f,
        -0.5f,  0.5f, 0.0f,      1.0f, 1.0f, 0.0f,       0.0f, 1.0f
    };

    unsigned int indieces[] = {
        0, 1, 2,
        2, 0, 3
    };  

    unsigned int VAB;
    glGenBuffers(1, &VAB);
    glBindBuffer(GL_ARRAY_BUFFER, VAB);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
    glEnableVertexAttribArray(1);
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
    glEnableVertexAttribArray(2);

    unsigned int VAO;
    glGenBuffers(1, &VAO);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VAO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indieces), indieces, GL_STATIC_DRAW);  

    glm::mat4 trans(1.0);
    trans = glm::rotate(trans, 90.0f, glm::vec3(0.0, 0.0, 1.0));
    trans = glm::scale(trans, glm::vec3(0.5, 0.5, 0.5));

    std::string vertexShaderSource = readFromFile("vertexShader.shader");
    std::string fragmentShaderSource = readFromFile("fragmentShader.shader");

    unsigned int shaderProgram = CreateShader(vertexShaderSource, fragmentShaderSource);

    unsigned int texture;
    glGenBuffers(1, &texture);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    stbi_set_flip_vertically_on_load(true);
    int width, height, nrChannels;
    unsigned char* data = stbi_load("C:/Users/usr/Desktop/container.jpg", &width, &height, &nrChannels, 0);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
    stbi_image_free(data);

    unsigned int texture2;
    glGenTextures(1, &texture2);
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, texture2);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    data = stbi_load("C:/Users/usr/Desktop/face.png", &width, &height, &nrChannels, 0);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
    stbi_image_free(data);

    glUseProgram(shaderProgram);
    glUniform1i(glGetUniformLocation(shaderProgram, "ourTexture"), 0);
    glUniform1i(glGetUniformLocation(shaderProgram, "ourTexture2"), 1);
    unsigned int transformLoc = glGetUniformLocation(shaderProgram, "transform");
    glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(trans));

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);

        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);

        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

#version 330 core
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aColor;
layout(location = 2) in vec2 aCords;

out vec3 ourColor;
out vec2 TextureCords;

uniform mat4 transform;

void main()
{
	gl_Position = transform * vec4(aPos, 1.0);                        
	ourColor = aColor;
	TextureCords = aCords;
}

#version 330 core

out vec4 FragColor;
in vec3 ourColor;
in vec2 TextureCords;

uniform sampler2D ourTexture;
uniform sampler2D ourTexture2;

void main()
{
	FragColor = mix(texture(ourTexture, TextureCords), texture(ourTexture2, TextureCords), 0.2) * vec4(ourColor, 1.0);
}

 

Answer 1

Problem rozwiązany. Polegał na tym, że kąt który podaje w funkcji glm::rotate ma być w radianach. Wystarczyło zamienić stopnie na radniany według wzoru na stronie LearnOpenGL i wszystko działa (zamiast 90.0f trzeba napisać 1.57f)