我一直在尝试在OpenGL中实现非常简单的着色器。不幸的是，我一直遇到：
Cannot access private member declared in class 'sf::NonCopyable
我尝试自己解决这个问题，我认为我在某处声明sf :: Shader。
sf::Shader compile_shaders(void)
{
sf::Shader shader;
const std::string vertex_shader_source = \
"#version 430 core "\
" "\
"void main(void){ "\
" gl_position = vec4(0.0, 0.0, 0.5, 1.0);"\
"} ";
const std::string fragment_shader_source = \
"#version 430 core "\
" "\
"out vec4 color; "\
" "\
"void main(void){ "\
" color = vec4(0.0, 0.8, 1.0, 1.0);"\
"} ";
shader.loadFromMemory(vertex_shader_source, fragment_shader_source);
return shader;
}
int main(){
int width = 800;
int height = 450;
sf::Window window(sf::VideoMode(width, height), "OpenGL Test", sf::Style::Default, sf::ContextSettings(32));
resize(width, height);
init();
window.setVerticalSyncEnabled(true);
sf::Shader shader = compile_shaders();
bool running = true;
while (running){
sf::Event event;
while (window.pollEvent(event)){
if (event.type == sf::Event::Closed)
running = false;
else if (event.type == sf::Event::Resized){
width = event.size.width;
height = event.size.height;
resize(width, height);
}
else if (event.type == sf::Event::KeyPressed & event.key.code == sf::Keyboard::Escape)
running = false;
}
sf::Shader::bind(&shader);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f,0.0f,-6.0f);
glBegin(GL_TRIANGLES);
glColor3f(1.0f,0.0f,0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glColor3f(0.0f,0.0f,1.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glEnd();
glTranslatef(3.0f, 0.0f, 0.0f);
glColor3f(0.5f,0.5f,1.0f);
glBegin(GL_QUADS);
glVertex3f(-1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glEnd();
window.display();
sf::Shader::bind(NULL);
}
return 0;
}
resize（）和init（）只是设置了一些OpenGL变量，所以我很确定它们不是问题。
看起来像是sfml家伙的设计监督。如果sf::Shader要实现move构造函数，这将起作用。就目前而言，您不能移动或复制a，sf::Shader因为其副本构造函数被声明为私有，并且未定义move构造函数。
您所能做的就是在堆上分配它，并从函数返回指向它的指针。
我建议你使用
std::unique_ptr<sf::Shader> compile_shaders(void){
auto shader = std::make_unique<sf::Shader>();
//or auto shader = std::unique_ptr<sf::Shader>(new sf::Shader()); if you don't have make_unique available
//... code ommitted
shader->loadFromMemory(vertex_shader_source, fragment_shader_source);
return shader;
}
然后用
auto shader = compile_shaders();
//... code omitted
sf::Shader::bind(shader.get());
如果要绕过着色器，请多用astd::shared_ptr代替std::unique_ptr
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我来说两句