Zero-copy EGLImage texture upload?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
24

What do you need from me ?
thks

25

Hi,
Please share us a sample as mentioned in
Zero-copy EGLImage texture upload? - #17 by michelcalifornia

So that we can try on developer kit.

26

Here is the callback that you need to use.

#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2ext.h>
#include "nvbufsurface.h"   // for NvBufSurface

static void gui_update_video_texture(GstCapture* capture) {
    if (!capture || !capture->video_out_appsink) return;
     
    nvtxRangePush("Video Texture Update");
    
    GstSample *videosample = gst_app_sink_try_pull_sample(
        GST_APP_SINK(capture->video_out_appsink), 1 * GST_MSECOND);
        
    if (videosample) {
        nvtxRangePush("Video Buffer Processing");
        GstBuffer *videobuf = gst_sample_get_buffer(videosample);
        GstMapInfo map;
        
        if (gst_buffer_map(videobuf, &map, GST_MAP_READ)) {
            // Treat buffer as NvBufSurface
            NvBufSurface *surface = (NvBufSurface*) map.data;
            int dmabuf_fd = surface->surfaceList[0].bufferDesc;
            int width     = surface->surfaceList[0].width;
            int height    = surface->surfaceList[0].height;

            // Describe how to import the DMA-BUF
            EGLint attribs[] = {
                EGL_WIDTH, width,
                EGL_HEIGHT, height,
                EGL_LINUX_DRM_FOURCC_EXT, DRM_FORMAT_NV12,  // or RGBA depending on caps!
                EGL_DMA_BUF_PLANE0_FD_EXT, dmabuf_fd,
                EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,
                EGL_DMA_BUF_PLANE0_PITCH_EXT, surface->surfaceList[0].pitch,
                EGL_NONE
            };

            // Create EGLImage from the dmabuf
            EGLDisplay eglDisplay = eglGetCurrentDisplay();
            EGLImageKHR eglImage = eglCreateImageKHR(
                eglDisplay, EGL_NO_CONTEXT,
                EGL_LINUX_DMA_BUF_EXT,
                (EGLClientBuffer)NULL,
                attribs
            );

            if (eglImage != EGL_NO_IMAGE_KHR) {
                // Bind EGLImage to your texture
                glBindTexture(GL_TEXTURE_2D, g_gui_state.videotex);
                glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, eglImage);

                // Once bound, destroy the EGLImage (texture keeps reference)
                eglDestroyImageKHR(eglDisplay, eglImage);
            } else {
                printf("Failed to create EGLImage from dmabuf\n");
            }

            gst_buffer_unmap(videobuf, &map);
        }
        gst_sample_unref(videosample);
        nvtxRangePop();
    }
    
    nvtxRangePop();
}

This is the one that you have to integrate in your code in place of the new_buufer callback.

27

Hi,
We are not able to check further with the partial code. Please share a full sample that we can compile and run.