使用OpenCV为OpenGL加载纹理 [英] Loading texture for OpenGL with OpenCV

问题描述

我已经看到许多用于为 OpenGL 加载纹理的代码示例，其中许多代码的理解有些复杂，或者需要大量代码才能使用新功能.

I have seen many code samples for loading textures for OpenGL, many of them a bit complicated to understand or requiring new functions with a lot of code.

我当时以为 OpenCV 允许我们加载任何图像格式，这可能是将纹理加载到 OpenGL 的一种简单有效的方法，但是我缺少了一些东西.我在 c ++ 中有这段代码:

I was thinking that as OpenCV allows us to load any image format it can be a simple an efficient way to load textures to OpenGL, but I am missing something. I have this piece of code in c++:

cv::Mat texture_cv;
GLuint texture[1];
int Status=FALSE;

if( texture_cv = imread("stones.jpg"))  {

        Status=TRUE;                            // Set The Status To TRUE
        glGenTextures(1, &texture[0]);                  // Create The Texture


        glBindTexture(GL_TEXTURE_2D, texture[0]);               
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); 
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); 
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S , GL_REPEAT );
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );

        glTexImage2D(GL_TEXTURE_2D, 0, 3, texture_cv.cols, texture_cv.rows, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_cv.data);
}

由于此错误，它无法编译:

And it is not compiling because of this error:

错误C2451:类型为'cv :: Mat'的条件表达式无效

error C2451: conditional expression of type 'cv::Mat' is illegal

有什么建议吗?我应该如何将cv :: Mat转换为openGL纹理?

Any suggestions? How should I do the conversion from cv::Mat to openGL texture?

推荐答案

您的错误在那里出现了，对吧?

Your error appears there, right?

if( texture_cv = imread("stones.jpg"))  {

因为在if(expr)中expr必须为bool或可以强制转换为bool.但是无法将cv::Mat隐式转换为布尔值.但是您可以像这样检查imread的结果:

because in if(expr) expr must be bool or can be casted to bool. But there is no way to convert cv::Mat into boolean implicitly. But you can check the result of imread like that:

texture_cv = imread("stones.jpg");
if (texture_cv.empty()) {
  // handle was an error
} else {
  // do right job
} 

请参阅: cv :: Mat :: empty()， cv :: imread

希望对您有帮助.

这篇关于使用OpenCV为OpenGL加载纹理的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！