小编Iva*_*van的帖子

我有以下代码:

#include <SFML\Graphics.hpp>
#include <iostream>

int main(int argc, char* argv[])
{
    sf::RenderWindow window(sf::VideoMode(640, 480), "SFML Render");
    sf::Image image;
    sf::Texture texture;
    sf::Sprite sprite;

    image.loadFromFile("D:/Project/Sprites/bt1.png");
    texture.loadFromImage(image);
    sprite.setTexture(texture);
    sprite.setPosition(100.0f, 100.0f);

    sf::Event event;
    while (window.isOpen())
    {
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        window.clear();
        window.draw(sprite);
        window.display();
    }

    return 0;
}

这很简单,但没有用.

我尝试使用不同种类的路径:

D:/Project/CPP/Game_Engine/Debug/sprites/first.bmp
D:\\Project\\CPP\\Game_Engine\\Debug\\sprites\\first.bmp
d:\\Project\\CPP\\Game_Engine\\Debug\\sprites\\first.bmp

然后我尝试使用不同的文件:

D:/Project/Sprites/bt.png
D:/Project/Sprites/anim.bmp
D:/Project/Sprites/boy.jpg

编译器指示在以下行:

image.loadFromFile("D:/Project/Sprites/bt1.png");

更确切地说,程序在此行崩溃.

我的配置如下:

错误/崩溃消息如下:

Необработанноеисключениепоадресу0x5007DEF8(msvcr110.dll)вSFML_ERROR.exe:0xC0000005:нарушениеправдоступапричтениипоадресу0x03BC1000.

翻译如下:

SFML_ERROR.exe中0x5007DEF8(msvcr110.dll)的未处理异常:0xC0000005:地址0x03BC1000上的访问冲突读取.

如何在Eigen中转换矩阵(4x4)？

//identity matrix 4x4
/*type=*/Eigen::Matrix<float, 4, 4> /*name=*/result = Eigen::Matrix<float, 4, 4>::Identity();

//translation vector
// 3.0f
// 4.0f
// 5.0f
Translation<float, 3> trans(3.0f, 4.0f, 5.0f);

即,我有矩阵:

1.0 0.0 0.0 0.0
0.0 1.0 0.0 0.0
0.0 0.0 1.0 0.0
0.0 0.0 0.0 1.0

我想得到:

1.0 0.0 0.0    3.0
0.0 1.0 0.0    4.0
0.0 0.0 1.0    5.0
0.0 0.0 0.0 1.0

对？我怎么能这样做？

我可以做这个:

result(0, 3) = 3.0f;
result(1, 3) = 4.0f;
result(2, 3) = 5.0f;

但它并不优雅.=)你的建议是什么？

如何将"特征矩阵"发送给GLSL？例如:

// Set up the model and projection matrix
Eigen::Matrix<GLfloat,4,4> projection_matrix;

projection_matrix = frustum(-1.0f, 1.0f, -aspect, aspect, 1.0f, 500.0f);
glUniformMatrix4fv(render_projection_matrix_loc, 1, GL_FALSE, &projection_matrix.data()[0]);

我way(matrix.date()[0])为uBLAS 看了这个,但是Eigen不是uBLAS.我怎么能这样做？

我不明白 OpenGL 的缓冲区是如何工作的。我通过 OpenGL 红皮书第 8 版学习 OpenGL。例如，我有一个位置数组、一个颜色数组和一个索引数组：

static const GLfloat strip_position[] =
    {
        -4.0f,  0.0f, -1.0f, 1.0f,  //0
        -3.5f, -1.0f, -1.0f, 1.0f,  //1
        -3.0f,  0.0f, -1.0f, 1.0f,  //2
        -2.5f, -1.0f, -1.0f, 1.0f,  //3
        -2.0f,  0.0f, -1.0f, 1.0f,  //4
        -1.5f, -1.0f, -1.0f, 1.0f,  //5
        -1.0f,  0.0f, -1.0f, 1.0f,  //6
        -0.5f, -1.0f, -1.0f, 1.0f,  //7
         0.0f,  0.0f, -1.0f, 1.0f   //8
    };
static const GLfloat strip_colors[] =
    {
        1.0f, 1.0f, 1.0f, 1.0f,
        1.0f, 1.0f, 0.0f, 1.0f,
        1.0f, 0.0f, 1.0f, 1.0f,
        1.0f, 0.0f, …

我使用VC++ 2013,我有以下代码:

#pragma warning(disable:4996)
#define D_SCL_SECURE_NO_WARNINGS

#include <iostream>
#include <fstream>
#include <object.pb.h>

using namespace std;

int main(int argc, char** argv)
{
    Object object;
    object.set_id(1);
    object.set_name("Ermolaev Ivan");
    object.set_vertex(300.0f);
    fstream output("myfile", ios::out | ios::binary);
    object.SerializeToOstream(&output);
    return 0x0;
}

但继续显示以下错误.

Error   1   error C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked …

例如,我有以下课程:

class singelton
{
public:
    static singelton* Instance()
    {
        if (m_pInstance == 0)
        {
            m_pInstance = new singelton();
        }
        return m_pInstance;
    }

    void setData(std::string input) { data = input; }
    void getData() const { std::cout << data << std::endl; }
private:
    singelton() {}
    ~singelton() {}

    static singelton* m_pInstance;

    std::string data;
};

typedef singelton s;

//what is this? Why need a singleton name? I mean "singelton*".
singelton* singelton::m_pInstance = 0;

int main(int argc, char** argv)
{
    s.Instance()->setData("Something...");
    s.Instance()->getData();
    return 0;
} …