从帧缓冲区GLSL读取到OpenCV [英] Reading from framebuffer GLSL to OpenCV
问题描述
我只是在尝试向cvMat提供由片段着色器生成的纹理,屏幕上没有任何显示,我不知道问题出在哪里,是驱动程序还是glreadPixels中的问题..我只是将TGA图像加载到片段着色器,然后对四边形进行纹理处理,我想将该纹理提供给cvMat,所以我使用glReadPixesl然后生成了一个新纹理,并将其绘制在四边形上,但是什么都没有出现.
I'm just trying to feed a cvMat a texture that is generated by fragment shader, there is nothing appears on the screen, I don't know where is the problem, is this in the driver or glreadPixels.. I just loaded a TGA Image, to a fragment shader, then textured a quad, I wanted to feed that texture to a cvMat, so I used glReadPixesl then genereated a new texture, and drew it on the quad, but nothing appears.
请注意,以下代码在每个帧处执行.
Kindly note that the following code is executed at each frame.
cv::Mat pixels;
glPixelStorei(GL_PACK_ALIGNMENT, (pixels.step & 3) ? 1 : 4);
glReadPixels(0, 0, 1024, 1024, GL_RGB, GL_UNSIGNED_BYTE, pixels.data);
glEnable(GL_TEXTURE_2D);
GLuint textureID;
glGenTextures(1, &textureID);
//glDeleteTextures(1, &textureID);
// Create the texture
glTexImage2D(GL_TEXTURE_2D, // Type of texture
0, // Pyramid level (for mip-mapping) - 0 is the top level
GL_RGB, // Internal colour format to convert to
1024, // Image width i.e. 640 for Kinect in standard mode
1024, // Image height i.e. 480 for Kinect in standard mode
0, // Border width in pixels (can either be 1 or 0)
GL_RGB, // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.)
GL_UNSIGNED_BYTE, // Image data type
pixels.data); // The actual image data itself
glActiveTexture ( textureID );
glBindTexture ( GL_TEXTURE_2D,textureID );
glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices );
推荐答案
textureID
看起来像纹理不完整.
将GL_TEXTURE_MIN_FILTER
设置为GL_NEAREST
或GL_LINEAR
.
或提供完整的mipmap集.
Or supply a complete set of mipmaps.
这篇关于从帧缓冲区GLSL读取到OpenCV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!