OpenGL不需要的三角形出现了纹理化由2个三角形组成的正方形

Question

我使用SFML / OpenGl

当我正方形纹理（由2个三角形组成）和图像时，会出现1个不需要的三角形：

错误是屏幕中间的小棕色三角形。

这是我的代码： 绘图功能：

glUseProgram(shader->getProgramID());

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vertices);
glEnableVertexAttribArray(0);

glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, coordTexture);
glEnableVertexAttribArray(2);


glUniformMatrix4fv(glGetUniformLocation(shader->getProgramID(), "projection"), 1, GL_FALSE, value_ptr(projection));

glUniformMatrix4fv(glGetUniformLocation(shader->getProgramID(), "modelview"), 1, GL_FALSE, value_ptr(modelview));


sf::Texture::bind(&textTest, sf::Texture::Normalized);

glDrawArrays(GL_TRIANGLES, 0, 9);

glDisableVertexAttribArray(2);
glDisableVertexAttribArray(0);

sf::Texture::bind(NULL);
glUseProgram(0);

参数：

shader = new Shader(vertexSource, fragmentSource);
float t = taille/2;
float points[] = { -t,-2.0,-t, -t,-2.0,t, t,-2.0,-t,
t,-2.0,-t, t,-2.0,t, -t,-2.0,t};

float text[] = {        
                0.0,0.0, 0.0,1.0, 1.0,0.0,
                1.0,0.0, 1.0,1.0, 0.0,1.0,

                };
for (int i = 0; i < 6*3; i++)
{
    vertices[i] = points[i];
    this->couleurs[i] = 1.0;
}
for (int i = 0; i < 6 * 2; i++)
{
    this->coordTexture[i] = text[i];
}
shader->charger();

textTest.loadFromFile("lama.jpg");

这很奇怪，因为当我改变时：

float text[] = {        
                0.0,0.0, 0.0,1.0, 1.0,0.0,
                1.0,0.0, 1.0,1.0, 0.0,1.0,                  
                };

到（切换坐标）：

float text[] = {        
                1.0,0.0, 1.0,1.0, 0.0,1.0,
                0.0,0.0, 0.0,1.0, 1.0,0.0,

                };

不需要的三角形消失了，但当然纹理的结果并不好。