Question

我试图制作我自己的opengl引擎用于学习目的，我使用glfw3，glew和assimp。到目前为止，我可以从文件加载模型并在屏幕上显示它们。它还可以从文件中读取和编译着色器。当我尝试使用着色器绘制网格时，它会消失，但如果我不使用着色器，它就会很好地显示出来。我认为我的问题可能是当我将网格数据绑定到VBO和VAO时。它也可能是我加载它的方式

这是我的Shader加载函数：

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这是我的Vertex Shader程序：

Shader::Shader(string vertex_path, string fragment_path) {
    Shader::success = false;

    string vertex, fragment;

    vertex = file_read_all(vertex_path);
    fragment = file_read_all(fragment_path);

    const GLchar *verCode = vertex.c_str();
    const GLchar *fraCode = fragment.c_str();

    GLuint verShader, fraShader;

    GLint success;
    GLchar log[512];

    verShader = glCreateShader(GL_VERTEX_SHADER);

    glShaderSource(verShader, 1 , &verCode, NULL);
    glCompileShader(verShader);

    glGetShaderiv(verShader, GL_COMPILE_STATUS, &success);

    if (!success) {
        glGetShaderInfoLog(verShader, 512, NULL, log);

        cout << "Failed to Compile Vertex Shader " << vertex_path << "!" << endl << log;
        return;
    }

    fraShader = glCreateShader(GL_FRAGMENT_SHADER);

    glShaderSource(fraShader, 1, &fraCode, NULL);
    glCompileShader(fraShader);

    glGetShaderiv(fraShader, GL_COMPILE_STATUS, &success);

    if (!success) {
        glGetShaderInfoLog(fraShader, 512, NULL, log);

        cout << "Failed to Compile Vertex Shader " << fragment_path << "!" << endl << log;
        return;
    }

    Shader::shader_id = glCreateProgram();

    glAttachShader(Shader::shader_id, verShader);
    glAttachShader(Shader::shader_id, fraShader);

    glLinkProgram(Shader::shader_id);

    glGetShaderiv(Shader::shader_id, GL_LINK_STATUS, &success);

    glDeleteShader(verShader);
    glDeleteShader(fraShader);

    if (!success) {
        glGetShaderInfoLog(Shader::shader_id, 512, NULL, log);

        cout << "Failed to Link Shaders " << vertex_path << " and " << fragment_path << "!" << endl << log;
        return;
    }

    Shader::success = true;
    }

这是我的功能，它将网格数据绑定到VBO＆＃39; s / VAO＆＃39>：

#version 330 core
layout (location = 0) in vec3 position;

uniform mat4 view;

void main()
{
    gl_Position = view * vec4(position, 1.0f);
}

以下是绘制网格的代码：

void Mesh::bind(vector<float> vertex, vector<float> normal, vector<GLuint> indices) {
    glGenVertexArrays(1, &this->VAO);
    glGenBuffers(1, &this->VBO);
    glGenBuffers(1, &this->EBO);

    glBindVertexArray(this->VAO);

    glBindBuffer(GL_ARRAY_BUFFER, this->VBO);

    glBufferData(GL_ARRAY_BUFFER, vertex.size() * sizeof(float), &vertex[0], GL_STATIC_DRAW);

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->EBO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), &indices[0], GL_STATIC_DRAW);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, vertex.size() * sizeof(float), 0);
    glEnableVertexAttribArray(1);
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, normal.size() * sizeof(float), 0);

    glBindVertexArray(0);

}

这是我加载和处理网格的函数：

void Mesh::Draw() {
    glBindVertexArray(this->VAO);
    glDrawArrays(GL_TRIANGLES, 0, this->count);
}

OpenGL不是网格显示

0 个答案: