Support wlroots screen capture, which doesn't require kms root access and also captures cursor

TODO

@@ -80,7 +80,6 @@ Support "screen" (all monitors) capture on wayland. This should be done by getti
 
 Support pipewire screen capture?
 Support screen rotation in amd/intel/nvidia wayland.
-Support wlroots dmabuf screen recording, because it doesn't require root access unlike kms grab.
 Capture cursor on amd/intel wayland without xwayland.
 When nvidia supports hardware cursor then capture the cursor. Right now the cursor is captured because it's a software cursor so it's composed on the dma buf.
 CPU usage is pretty high on AMD/Intel/(Nvidia(wayland)), why? opening and closing fds, creating egl, cuda association, is slow when done every frame. Test if desktop portal screencast has better performance.

build.sh

@@ -9,10 +9,10 @@ CXX=${CXX:-g++}
 opts="-O2 -g0 -DNDEBUG -Wall -Wextra"
 [ -n "$DEBUG" ] && opts="-O0 -g3 -Wall -Wextra";
 
-#build_wayland_protocol() {
+build_wayland_protocol() {
-#    wayland-scanner private-code external/wlr-export-dmabuf-unstable-v1.xml external/wlr-export-dmabuf-unstable-v1-protocol.c
+    wayland-scanner private-code external/wlr-export-dmabuf-unstable-v1.xml external/wlr-export-dmabuf-unstable-v1-protocol.c
-#    wayland-scanner client-header external/wlr-export-dmabuf-unstable-v1.xml external/wlr-export-dmabuf-unstable-v1-client-protocol.h
+    wayland-scanner client-header external/wlr-export-dmabuf-unstable-v1.xml external/wlr-export-dmabuf-unstable-v1-client-protocol.h
-#}
+}
 
 build_gsr_kms_server() {
     # TODO: -fcf-protection=full, not supported on arm
@@ -45,14 +45,14 @@ build_gsr() {
     $CC -c src/cursor.c $opts $includes
     $CC -c src/utils.c $opts $includes
     $CC -c src/library_loader.c $opts $includes
-    #$CC -c external/wlr-export-dmabuf-unstable-v1-protocol.c $opts $includes
+    $CC -c external/wlr-export-dmabuf-unstable-v1-protocol.c $opts $includes
     $CXX -c src/sound.cpp $opts $includes
     $CXX -c src/main.cpp $opts $includes
     $CXX -o gpu-screen-recorder capture.o nvfbc.o kms_client.o egl.o cuda.o xnvctrl.o overclock.o window_texture.o shader.o \
-        color_conversion.o cursor.o utils.o library_loader.o xcomposite_cuda.o xcomposite_vaapi.o kms_vaapi.o kms_cuda.o sound.o main.o $libs $opts
+        color_conversion.o cursor.o utils.o library_loader.o xcomposite_cuda.o xcomposite_vaapi.o kms_vaapi.o kms_cuda.o wlr-export-dmabuf-unstable-v1-protocol.o sound.o main.o $libs $opts
 }
 
-#build_wayland_protocol
+build_wayland_protocol
 build_gsr_kms_server
 build_gsr
 echo "Successfully built gpu-screen-recorder"

include/egl.h

@@ -7,6 +7,7 @@
 #include <X11/Xutil.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include "vec2.h"
 
 #ifdef _WIN64
 typedef signed   long long int khronos_intptr_t;
@@ -105,6 +106,35 @@ typedef unsigned int (*FUNC_eglExportDMABUFImageQueryMESA)(EGLDisplay dpy, EGLIm
 typedef unsigned int (*FUNC_eglExportDMABUFImageMESA)(EGLDisplay dpy, EGLImageKHR image, int *fds, int32_t *strides, int32_t *offsets);
 typedef void (*FUNC_glEGLImageTargetTexture2DOES)(unsigned int target, GLeglImageOES image);
 
+#define GSR_MAX_OUTPUTS 32
+
+typedef struct {
+    Display *dpy;
+    Window window;
+} gsr_x11;
+
+typedef struct {
+    uint32_t wl_name;
+    void *output;
+    vec2i pos;
+    vec2i size;
+    char *name;
+} gsr_wayland_output;
+
+typedef struct {
+    void *dpy;
+    void *window;
+    void *registry;
+    void *surface;
+    void *compositor;
+    void *export_manager;
+    void *current_frame;
+    void *frame_callback;
+    gsr_wayland_output outputs[GSR_MAX_OUTPUTS];
+    int num_outputs;
+    gsr_wayland_output *output_to_capture;
+} gsr_wayland;
+
 typedef struct {
     void *egl_library;
     void *gl_library;
@@ -113,14 +143,8 @@ typedef struct {
     EGLSurface egl_surface;
     EGLContext egl_context;
 
-    Display *x11_dpy;
+    gsr_x11 x11;
-    Window x11_window;
+    gsr_wayland wayland;
-
-    void *wayland_dpy;
-    void *wayland_window;
-    void *wayland_registry;
-    void *wayland_surface;
-    void *wayland_compositor;
 
     int fd;
     uint32_t width;
@@ -204,6 +228,9 @@ typedef struct {
 bool gsr_egl_load(gsr_egl *self, Display *dpy, bool wayland);
 void gsr_egl_unload(gsr_egl *self);
 
+/* wayland protocol capture, does not include kms capture */
+bool gsr_egl_supports_wayland_capture(gsr_egl *self);
+bool gsr_egl_start_capture(gsr_egl *self, const char *monitor_to_capture);
 void gsr_egl_update(gsr_egl *self);
 void gsr_egl_cleanup_frame(gsr_egl *self);
 

src/capture/kms_cuda.c

@@ -34,6 +34,8 @@ typedef struct {
     
     gsr_kms_client kms_client;
     gsr_kms_response kms_response;
+    gsr_kms_response_fd wayland_kms_data;
+    bool using_wayland_capture;
 
     vec2i capture_pos;
     vec2i capture_size;
@@ -131,10 +133,27 @@ static void monitor_callback(const gsr_monitor *monitor, void *userdata) {
 static int gsr_capture_kms_cuda_start(gsr_capture *cap, AVCodecContext *video_codec_context) {
     gsr_capture_kms_cuda *cap_kms = cap->priv;
 
-    if(gsr_kms_client_init(&cap_kms->kms_client, cap_kms->params.card_path) != 0) {
+    if(!gsr_egl_load(&cap_kms->egl, NULL, true)) {
+        fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to load opengl\n");
+        gsr_capture_kms_cuda_stop(cap, video_codec_context);
         return -1;
     }
+
+    gsr_monitor monitor;
     cap_kms->monitor_id.num_connector_ids = 0;
+    if(gsr_egl_start_capture(&cap_kms->egl, cap_kms->params.display_to_capture)) {
+        if(!get_monitor_by_name(&cap_kms->egl, GSR_CONNECTION_WAYLAND, cap_kms->params.display_to_capture, &monitor)) {
+            fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to find monitor by name \"%s\"\n", cap_kms->params.display_to_capture);
+            gsr_capture_kms_cuda_stop(cap, video_codec_context);
+            return -1;
+        }
+        cap_kms->using_wayland_capture = true;
+    } else {
+        if(gsr_kms_client_init(&cap_kms->kms_client, cap_kms->params.card_path) != 0) {
+            gsr_capture_kms_cuda_stop(cap, video_codec_context);
+            return -1;
+        }
+
         MonitorCallbackUserdata monitor_callback_userdata = {
             cap_kms,
             cap_kms->params.display_to_capture, strlen(cap_kms->params.display_to_capture),
@@ -142,12 +161,12 @@ static int gsr_capture_kms_cuda_start(gsr_capture *cap, AVCodecContext *video_co
         };
         for_each_active_monitor_output((void*)cap_kms->params.card_path, GSR_CONNECTION_DRM, monitor_callback, &monitor_callback_userdata);
 
-    gsr_monitor monitor;
         if(!get_monitor_by_name((void*)cap_kms->params.card_path, GSR_CONNECTION_DRM, cap_kms->params.display_to_capture, &monitor)) {
             fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to find monitor by name \"%s\"\n", cap_kms->params.display_to_capture);
             gsr_capture_kms_cuda_stop(cap, video_codec_context);
             return -1;
         }
+    }
 
     cap_kms->capture_pos = monitor.pos;
     cap_kms->capture_size = monitor.size;
@@ -155,12 +174,6 @@ static int gsr_capture_kms_cuda_start(gsr_capture *cap, AVCodecContext *video_co
     video_codec_context->width = max_int(2, even_number_ceil(cap_kms->capture_size.x));
     video_codec_context->height = max_int(2, even_number_ceil(cap_kms->capture_size.y));
 
-    if(!gsr_egl_load(&cap_kms->egl, NULL, true)) {
-        fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to load opengl\n");
-        gsr_capture_kms_cuda_stop(cap, video_codec_context);
-        return -1;
-    }
-
     /* Disable vsync */
     cap_kms->egl.eglSwapInterval(cap_kms->egl.egl_display, 0);
 
@@ -183,8 +196,6 @@ static uint32_t fourcc(uint32_t a, uint32_t b, uint32_t c, uint32_t d) {
     return (d << 24) | (c << 16) | (b << 8) | a;
 }
 
-#define FOURCC_NV12 842094158
-
 static void gsr_capture_kms_cuda_tick(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame **frame) {
     gsr_capture_kms_cuda *cap_kms = cap->priv;
 
@@ -278,8 +289,18 @@ static bool gsr_capture_kms_register_egl_image_in_cuda(gsr_capture_kms_cuda *cap
         return false;
     }
 
+    if(res != CUDA_SUCCESS) {
+        fprintf(stderr, "cuda error 1\n");
+    }
+
     res = cap_kms->cuda.cuGraphicsResourceSetMapFlags(cap_kms->cuda_graphics_resource, CU_GRAPHICS_MAP_RESOURCE_FLAGS_READ_ONLY);
+    if(res != CUDA_SUCCESS) {
+        fprintf(stderr, "cuda error 2\n");
+    }
     res = cap_kms->cuda.cuGraphicsSubResourceGetMappedArray(&cap_kms->mapped_array, cap_kms->cuda_graphics_resource, 0, 0);
+    if(res != CUDA_SUCCESS) {
+        fprintf(stderr, "cuda error 3\n");
+    }
     res = cap_kms->cuda.cuCtxPopCurrent_v2(&old_ctx);
     return true;
 }
@@ -310,6 +331,24 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
     }
     cap_kms->kms_response.num_fds = 0;
 
+    gsr_kms_response_fd *drm_fd = NULL;
+    if(cap_kms->using_wayland_capture) {
+        gsr_egl_update(&cap_kms->egl);
+        cap_kms->wayland_kms_data.fd = cap_kms->egl.fd;
+        cap_kms->wayland_kms_data.width = cap_kms->egl.width;
+        cap_kms->wayland_kms_data.height = cap_kms->egl.height;
+        cap_kms->wayland_kms_data.pitch = cap_kms->egl.pitch;
+        cap_kms->wayland_kms_data.offset = cap_kms->egl.offset;
+        cap_kms->wayland_kms_data.pixel_format = cap_kms->egl.pixel_format;
+        cap_kms->wayland_kms_data.modifier = cap_kms->egl.modifier;
+        cap_kms->wayland_kms_data.connector_id = 0;
+        cap_kms->wayland_kms_data.is_combined_plane = false;
+
+        if(cap_kms->wayland_kms_data.fd <= 0)
+            return -1;
+
+        drm_fd = &cap_kms->wayland_kms_data;
+    } else {
         if(gsr_kms_client_get_kms(&cap_kms->kms_client, &cap_kms->kms_response) != 0) {
             fprintf(stderr, "gsr error: gsr_capture_kms_cuda_capture: failed to get kms, error: %d (%s)\n", cap_kms->kms_response.result, cap_kms->kms_response.err_msg);
             return -1;
@@ -324,7 +363,6 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
             return -1;
         }
 
-    gsr_kms_response_fd *drm_fd = NULL;
         for(int i = 0; i < cap_kms->monitor_id.num_connector_ids; ++i) {
             drm_fd = find_drm_by_connector_id(&cap_kms->kms_response, cap_kms->monitor_id.connector_ids[i]);
             if(drm_fd)
@@ -336,15 +374,13 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
             if(!drm_fd)
                 drm_fd = find_largest_drm(&cap_kms->kms_response);
         }
+    }
 
     if(!drm_fd)
         return -1;
 
     //bool capture_is_combined_plane = drm_fd->is_combined_plane || ((int)drm_fd->width == cap_kms->screen_size.x && (int)drm_fd->height == cap_kms->screen_size.y);
 
-    //gsr_egl_cleanup_frame(&cap_kms->egl);
-    //gsr_egl_update(&cap_kms->egl);
-
     const intptr_t img_attr[] = {
         //EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
         EGL_LINUX_DRM_FOURCC_EXT,       fourcc('A', 'R', '2', '4'),//cap_kms->egl.pixel_format, ARGB8888
@@ -358,7 +394,13 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
         EGL_NONE
     };
 
+    while(cap_kms->egl.glGetError()) {}
+    while(cap_kms->egl.eglGetError() != EGL_SUCCESS){}
     EGLImage image = cap_kms->egl.eglCreateImage(cap_kms->egl.egl_display, 0, EGL_LINUX_DMA_BUF_EXT, NULL, img_attr);
+    if(cap_kms->egl.glGetError() != 0 || cap_kms->egl.eglGetError() != EGL_SUCCESS) {
+        fprintf(stderr, "egl error!\n");
+    }
+
     gsr_capture_kms_register_egl_image_in_cuda(cap_kms, image);
     cap_kms->egl.eglDestroyImage(cap_kms->egl.egl_display, image);
 
@@ -385,6 +427,8 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
 
     gsr_capture_kms_unload_cuda_graphics(cap_kms);
 
+    gsr_egl_cleanup_frame(&cap_kms->egl);
+
     for(int i = 0; i < cap_kms->kms_response.num_fds; ++i) {
         if(cap_kms->kms_response.fds[i].fd > 0)
             close(cap_kms->kms_response.fds[i].fd);

src/capture/kms_vaapi.c

@@ -44,6 +44,8 @@ typedef struct {
     
     gsr_kms_client kms_client;
     gsr_kms_response kms_response;
+    gsr_kms_response_fd wayland_kms_data;
+    bool using_wayland_capture;
 
     vec2i screen_size;
     vec2i capture_pos;
@@ -190,7 +192,26 @@ static void monitor_callback(const gsr_monitor *monitor, void *userdata) {
 static int gsr_capture_kms_vaapi_start(gsr_capture *cap, AVCodecContext *video_codec_context) {
     gsr_capture_kms_vaapi *cap_kms = cap->priv;
 
+    cap_kms->x11_rot = X11_ROT_0;
+
+    if(!gsr_egl_load(&cap_kms->egl, cap_kms->dpy, cap_kms->params.wayland)) {
+        fprintf(stderr, "gsr error: gsr_capture_kms_vaapi_start: failed to load opengl\n");
+        gsr_capture_kms_vaapi_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    gsr_monitor monitor;
+    cap_kms->monitor_id.num_connector_ids = 0;
+    if(cap_kms->params.wayland && gsr_egl_start_capture(&cap_kms->egl, cap_kms->params.display_to_capture)) {
+        if(!get_monitor_by_name(&cap_kms->egl, GSR_CONNECTION_WAYLAND, cap_kms->params.display_to_capture, &monitor)) {
+            fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to find monitor by name \"%s\"\n", cap_kms->params.display_to_capture);
+            gsr_capture_kms_vaapi_stop(cap, video_codec_context);
+            return -1;
+        }
+        cap_kms->using_wayland_capture = true;
+    } else {
         if(gsr_kms_client_init(&cap_kms->kms_client, cap_kms->params.card_path) != 0) {
+            gsr_capture_kms_vaapi_stop(cap, video_codec_context);
             return -1;
         }
 
@@ -206,14 +227,12 @@ static int gsr_capture_kms_vaapi_start(gsr_capture *cap, AVCodecContext *video_c
         };
 
         if(cap_kms->params.wayland) {
-        cap_kms->monitor_id.num_connector_ids = 0;
             for_each_active_monitor_output(connection, connection_type, monitor_callback, &monitor_callback_userdata);
 
             cap_kms->screen_size.x = 0;
             cap_kms->screen_size.y = 0;
         } else {
             const Atom randr_connector_id_atom = XInternAtom(cap_kms->dpy, "CONNECTOR_ID", False);
-        cap_kms->monitor_id.num_connector_ids = 0;
             monitor_callback_userdata.randr_connector_id_atom = randr_connector_id_atom;
             monitor_callback_userdata.wayland = false;
             for_each_active_monitor_output(connection, connection_type, monitor_callback, &monitor_callback_userdata);
@@ -244,16 +263,11 @@ static int gsr_capture_kms_vaapi_start(gsr_capture *cap, AVCodecContext *video_c
         } else {
             cap_kms->requires_rotation = false;
         }
+    }
 
     cap_kms->capture_pos = monitor.pos;
     cap_kms->capture_size = monitor.size;
 
-    if(!gsr_egl_load(&cap_kms->egl, cap_kms->dpy, cap_kms->params.wayland)) {
-        fprintf(stderr, "gsr error: gsr_capture_kms_vaapi_start: failed to load opengl\n");
-        gsr_capture_kms_vaapi_stop(cap, video_codec_context);
-        return -1;
-    }
-
     /* Disable vsync */
     cap_kms->egl.eglSwapInterval(cap_kms->egl.egl_display, 0);
 
@@ -265,7 +279,7 @@ static int gsr_capture_kms_vaapi_start(gsr_capture *cap, AVCodecContext *video_c
         return -1;
     }
 
-    if(cap_kms->dpy) {
+    if(cap_kms->dpy && !cap_kms->params.wayland) {
         if(gsr_cursor_init(&cap_kms->cursor, &cap_kms->egl, cap_kms->dpy) != 0) {
             gsr_capture_kms_vaapi_stop(cap, video_codec_context);
             return -1;
@@ -290,7 +304,7 @@ static void gsr_capture_kms_vaapi_tick(gsr_capture *cap, AVCodecContext *video_c
     // TODO:
     cap_kms->egl.glClear(GL_COLOR_BUFFER_BIT);
 
-    if(cap_kms->dpy) {
+    if(cap_kms->dpy && !cap_kms->params.wayland) {
         while(XPending(cap_kms->dpy)) {
             XNextEvent(cap_kms->dpy, &cap_kms->xev);
             gsr_cursor_update(&cap_kms->cursor, &cap_kms->xev);
@@ -479,6 +493,25 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
     }
     cap_kms->kms_response.num_fds = 0;
 
+    gsr_kms_response_fd *drm_fd = NULL;
+    bool requires_rotation = cap_kms->requires_rotation;
+    if(cap_kms->using_wayland_capture) {
+        gsr_egl_update(&cap_kms->egl);
+        cap_kms->wayland_kms_data.fd = cap_kms->egl.fd;
+        cap_kms->wayland_kms_data.width = cap_kms->egl.width;
+        cap_kms->wayland_kms_data.height = cap_kms->egl.height;
+        cap_kms->wayland_kms_data.pitch = cap_kms->egl.pitch;
+        cap_kms->wayland_kms_data.offset = cap_kms->egl.offset;
+        cap_kms->wayland_kms_data.pixel_format = cap_kms->egl.pixel_format;
+        cap_kms->wayland_kms_data.modifier = cap_kms->egl.modifier;
+        cap_kms->wayland_kms_data.connector_id = 0;
+        cap_kms->wayland_kms_data.is_combined_plane = false;
+
+        if(cap_kms->wayland_kms_data.fd <= 0)
+            return -1;
+
+        drm_fd = &cap_kms->wayland_kms_data;
+    } else {
         if(gsr_kms_client_get_kms(&cap_kms->kms_client, &cap_kms->kms_response) != 0) {
             fprintf(stderr, "gsr error: gsr_capture_kms_vaapi_capture: failed to get kms, error: %d (%s)\n", cap_kms->kms_response.result, cap_kms->kms_response.err_msg);
             return -1;
@@ -493,9 +526,6 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
             return -1;
         }
 
-    bool requires_rotation = cap_kms->requires_rotation;
-
-    gsr_kms_response_fd *drm_fd = NULL;
         if(cap_kms->screen_capture) {
             drm_fd = find_first_combined_drm(&cap_kms->kms_response);
             if(!drm_fd)
@@ -515,6 +545,7 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
                     drm_fd = find_largest_drm(&cap_kms->kms_response);
             }
         }
+    }
 
     if(!drm_fd)
         return -1;
@@ -558,6 +589,12 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
     cap_kms->egl.eglDestroyImage(cap_kms->egl.egl_display, image);
     cap_kms->egl.glBindTexture(GL_TEXTURE_2D, 0);
 
+    if(cap_kms->using_wayland_capture) {
+        gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->input_texture,
+            (vec2i){0, 0}, cap_kms->capture_size,
+            cap_kms->capture_pos, cap_kms->capture_size,
+            0.0f);
+    } else {
         float texture_rotation = 0.0f;
         if(requires_rotation) {
             switch(cap_kms->x11_rot) {
@@ -576,7 +613,7 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
             }
         }
 
-    if(cap_kms->dpy) {
+        if(cap_kms->dpy && !cap_kms->params.wayland) {
             gsr_cursor_tick(&cap_kms->cursor);
         }
 
@@ -593,15 +630,18 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
             capture_pos, capture_size,
             texture_rotation);
 
-    if(cap_kms->dpy) {
+        if(cap_kms->dpy && !cap_kms->params.wayland) {
             gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->cursor.texture_id,
                 cursor_capture_pos, (vec2i){cap_kms->cursor.size.x, cap_kms->cursor.size.y},
                 (vec2i){0, 0}, (vec2i){cap_kms->cursor.size.x, cap_kms->cursor.size.y},
                 0.0f);
         }
+    }
 
     cap_kms->egl.eglSwapBuffers(cap_kms->egl.egl_display, cap_kms->egl.egl_surface);
 
+    gsr_egl_cleanup_frame(&cap_kms->egl);
+
     for(int i = 0; i < cap_kms->kms_response.num_fds; ++i) {
         if(cap_kms->kms_response.fds[i].fd > 0)
             close(cap_kms->kms_response.fds[i].fd);

src/egl.c

@@ -2,48 +2,65 @@
 #include "../include/library_loader.h"
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <dlfcn.h>
 #include <assert.h>
 
 #include <wayland-client.h>
 #include <wayland-egl.h>
-//#include "../external/wlr-export-dmabuf-unstable-v1-client-protocol.h"
+#include "../external/wlr-export-dmabuf-unstable-v1-client-protocol.h"
 #include <unistd.h>
 
-#if 0
-static struct wl_compositor *compositor = NULL;
-static struct wl_output *output = NULL;
-static struct zwlr_export_dmabuf_manager_v1 *export_manager = NULL;
-static struct zwlr_export_dmabuf_frame_v1 *current_frame = NULL;
-//static struct wl_shell *shell = NULL;
-
-struct window {
-	EGLContext egl_context;
-	struct wl_surface *surface;
-	//struct wl_shell_surface *shell_surface;
-	struct wl_egl_window *egl_window;
-	EGLSurface egl_surface;
-};
-
 static void output_handle_geometry(void *data, struct wl_output *wl_output,
         int32_t x, int32_t y, int32_t phys_width, int32_t phys_height,
         int32_t subpixel, const char *make, const char *model,
         int32_t transform) {
-	fprintf(stderr, "output geometry, make: %s, model: %s\n", make, model);
+    (void)wl_output;
+    (void)phys_width;
+    (void)phys_height;
+    (void)subpixel;
+    (void)make;
+    (void)model;
+    (void)transform;
+    gsr_wayland_output *gsr_output = data;
+    gsr_output->pos.x = x;
+    gsr_output->pos.y = y;
 }
 
-static void output_handle_mode(void *data, struct wl_output *wl_output,
+static void output_handle_mode(void *data, struct wl_output *wl_output, uint32_t flags, int32_t width, int32_t height, int32_t refresh) {
-		uint32_t flags, int32_t width, int32_t height, int32_t refresh) {
+    (void)wl_output;
-	
+    (void)flags;
+    (void)refresh;
+    gsr_wayland_output *gsr_output = data;
+    gsr_output->size.x = width;
+    gsr_output->size.y = height;
 }
 
-static void output_handle_done(void* data, struct wl_output *wl_output) {
+static void output_handle_done(void *data, struct wl_output *wl_output) {
-	/* Nothing to do */
+    (void)data;
+    (void)wl_output;
 }
 
-static void output_handle_scale(void* data, struct wl_output *wl_output,
+static void output_handle_scale(void* data, struct wl_output *wl_output, int32_t factor) {
-		int32_t factor) {
+    (void)data;
-	/* Nothing to do */
+    (void)wl_output;
+    (void)factor;
+}
+
+static void output_handle_name(void *data, struct wl_output *wl_output, const char *name) {
+    (void)wl_output;
+    gsr_wayland_output *gsr_output = data;
+    if(gsr_output->name) {
+        free(gsr_output->name);
+        gsr_output->name = NULL;
+    }
+    gsr_output->name = strdup(name);
+}
+
+static void output_handle_description(void *data, struct wl_output *wl_output, const char *description) {
+    (void)data;
+    (void)wl_output;
+    (void)description;
 }
 
 static const struct wl_output_listener output_listener = {
@@ -51,76 +68,113 @@ static const struct wl_output_listener output_listener = {
     .mode = output_handle_mode,
     .done = output_handle_done,
     .scale = output_handle_scale,
+    .name = output_handle_name,
+    .description = output_handle_description,
 };
-#endif
 
-static void registry_add_object (void *data, struct wl_registry *registry, uint32_t name, const char *interface, uint32_t version) {
+static void registry_add_object(void *data, struct wl_registry *registry, uint32_t name, const char *interface, uint32_t version) {
     (void)version;
-    struct wl_compositor **wayland_compositor = data;
+    gsr_egl *egl = data;
     if (strcmp(interface, "wl_compositor") == 0) {
-        if(*wayland_compositor) {
+        if(egl->wayland.compositor) {
-            wl_compositor_destroy(*wayland_compositor);
+            wl_compositor_destroy(egl->wayland.compositor);
-            *wayland_compositor = NULL;
+            egl->wayland.compositor = NULL;
         }
-		*wayland_compositor = wl_registry_bind(registry, name, &wl_compositor_interface, 1);
+        egl->wayland.compositor = wl_registry_bind(registry, name, &wl_compositor_interface, 1);
-    }/* else if(strcmp(interface, wl_output_interface.name) == 0) {
+    } else if(strcmp(interface, wl_output_interface.name) == 0) {
-        fprintf(stderr, "wayland output, name: %u\n", name);
+        if(version < 4) {
-        output = wl_registry_bind(registry, name, &wl_output_interface, 1);
+            fprintf(stderr, "gsr warning: wl output interface version is < 4, expected >= 4 to capture a monitor. Using KMS capture instead\n");
-        wl_output_add_listener(output, &output_listener, NULL);
+            return;
+        }
+
+        if(egl->wayland.num_outputs == GSR_MAX_OUTPUTS) {
+            fprintf(stderr, "gsr warning: reached maximum outputs (32), ignoring output %u\n", name);
+            return;
+        }
+
+        gsr_wayland_output *gsr_output = &egl->wayland.outputs[egl->wayland.num_outputs];
+        egl->wayland.num_outputs++;
+        *gsr_output = (gsr_wayland_output) {
+            .wl_name = name,
+            .output = wl_registry_bind(registry, name, &wl_output_interface, 4),
+            .pos = { .x = 0, .y = 0 },
+            .size = { .x = 0, .y = 0 },
+            .name = NULL,
+        };
+        wl_output_add_listener(gsr_output->output, &output_listener, gsr_output);
     } else if(strcmp(interface, zwlr_export_dmabuf_manager_v1_interface.name) == 0) {
-        export_manager = wl_registry_bind(registry, name, &zwlr_export_dmabuf_manager_v1_interface, 1);
+        if(egl->wayland.export_manager) {
-    }*/
+            zwlr_export_dmabuf_manager_v1_destroy(egl->wayland.export_manager);
-    //fprintf(stderr, "interface: %s\n", interface);
+            egl->wayland.export_manager = NULL;
+        }
+        egl->wayland.export_manager = wl_registry_bind(registry, name, &zwlr_export_dmabuf_manager_v1_interface, 1);
+    }
 }
 
-static void registry_remove_object (void *data, struct wl_registry *registry, uint32_t name) {
+static void registry_remove_object(void *data, struct wl_registry *registry, uint32_t name) {
     (void)data;
     (void)registry;
     (void)name;
 }
 
-static struct wl_registry_listener registry_listener = {&registry_add_object, &registry_remove_object};
+static struct wl_registry_listener registry_listener = {
+    .global = registry_add_object,
+    .global_remove = registry_remove_object,
+};
 
-#if 0
+static void frame_capture_output(gsr_egl *egl);
-static void register_cb(gsr_egl *egl);
 
 static void frame_start(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
         uint32_t width, uint32_t height, uint32_t offset_x, uint32_t offset_y,
         uint32_t buffer_flags, uint32_t flags, uint32_t format,
         uint32_t mod_high, uint32_t mod_low, uint32_t num_objects) {
+    (void)offset_x;
+    (void)offset_y;
+    (void)buffer_flags;
+    (void)flags;
+    (void)num_objects;
     gsr_egl *egl = data;
-	//fprintf(stderr, "frame start, width: %u, height: %u, offset x: %u, offset y: %u, format: %u, num objects: %u\n", width, height, offset_x, offset_y, format, num_objects);
+    //fprintf(stderr, "frame start %p, width: %u, height: %u, offset x: %u, offset y: %u, format: %u, num objects: %u\n", (void*)frame, width, height, offset_x, offset_y, format, num_objects);
     egl->width = width;
     egl->height = height;
     egl->pixel_format = format;
-    egl->modifier = ((uint64_t)mod_high << 32) | mod_low;
+    egl->modifier = ((uint64_t)mod_high << 32) | (uint64_t)mod_low;
-    current_frame = frame;
+    egl->wayland.current_frame = frame;
 }
 
 static void frame_object(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
         uint32_t index, int32_t fd, uint32_t size, uint32_t offset,
         uint32_t stride, uint32_t plane_index) {
     // TODO: What if we get multiple objects? then we get multiple fd per frame
+    (void)frame;
+    (void)index;
+    (void)size;
+    (void)plane_index;
     gsr_egl *egl = data;
-    //egl->fd = fd;
+    if(egl->fd > 0) {
+        close(egl->fd);
+        egl->fd = 0;
+    }
+    egl->fd = fd;
     egl->pitch = stride;
     egl->offset = offset;
-	//fprintf(stderr, "new frame, fd: %d, index: %u, size: %u, offset: %u, stride: %u, plane_index: %u\n", fd, index, size, offset, stride, plane_index);
+    //fprintf(stderr, "new frame %p, fd: %d, index: %u, size: %u, offset: %u, stride: %u, plane_index: %u\n", (void*)frame, fd, index, size, offset, stride, plane_index);
-    close(fd);
 }
 
-
+static void frame_ready(void *data, struct zwlr_export_dmabuf_frame_v1 *frame, uint32_t tv_sec_hi, uint32_t tv_sec_lo, uint32_t tv_nsec) {
-static void frame_ready(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
+    (void)frame;
-		uint32_t tv_sec_hi, uint32_t tv_sec_lo, uint32_t tv_nsec) {
+    (void)tv_sec_hi;
-	register_cb(data);
+    (void)tv_sec_lo;
+    (void)tv_nsec;
+    frame_capture_output(data);
 }
 
-static void frame_cancel(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
+static void frame_cancel(void *data, struct zwlr_export_dmabuf_frame_v1 *frame, uint32_t reason) {
-		uint32_t reason) {
+    (void)frame;
-    register_cb(data);
+    (void)reason;
+    frame_capture_output(data);
 }
 
-
 static const struct zwlr_export_dmabuf_frame_v1_listener frame_listener = {
     .frame = frame_start,
     .object = frame_object,
@@ -128,31 +182,33 @@ static const struct zwlr_export_dmabuf_frame_v1_listener frame_listener = {
     .cancel = frame_cancel,
 };
 
-static struct zwlr_export_dmabuf_frame_v1 *frame_callback = NULL;
+static void frame_capture_output(gsr_egl *egl) {
-static void register_cb(gsr_egl *egl) {
+    assert(egl->wayland.output_to_capture);
-    bool with_cursor = false;
+    bool with_cursor = true;
-    frame_callback = zwlr_export_dmabuf_manager_v1_capture_output(export_manager, with_cursor, output);
+
-    zwlr_export_dmabuf_frame_v1_add_listener(frame_callback, &frame_listener, egl);
+    if(egl->wayland.frame_callback) {
+        zwlr_export_dmabuf_frame_v1_destroy(egl->wayland.frame_callback);
+        egl->wayland.frame_callback = NULL;
+    }
+
+    egl->wayland.frame_callback = zwlr_export_dmabuf_manager_v1_capture_output(egl->wayland.export_manager, with_cursor, egl->wayland.output_to_capture->output);
+    zwlr_export_dmabuf_frame_v1_add_listener(egl->wayland.frame_callback, &frame_listener, egl);
+}
+
+static gsr_wayland_output* get_wayland_output_by_name(gsr_egl *egl, const char *name) {
+    assert(name);
+    for(int i = 0; i < egl->wayland.num_outputs; ++i) {
+        if(egl->wayland.outputs[i].name && strcmp(egl->wayland.outputs[i].name, name) == 0)
+            return &egl->wayland.outputs[i];
+    }
+    return NULL;
 }
-#endif
 
 // TODO: Create egl context without surface (in other words, x11/wayland agnostic, doesn't require x11/wayland dependency)
 static bool gsr_egl_create_window(gsr_egl *self, bool wayland) {
     EGLConfig  ecfg;
     int32_t    num_config = 0;
 
-    EGLDisplay egl_display = NULL;
-    EGLSurface egl_surface = NULL;
-    EGLContext egl_context = NULL;
-
-    Window x11_window = None;
-
-    struct wl_registry *wayland_registry = NULL;
-    struct wl_compositor *wayland_compositor = NULL;
-    struct wl_surface *wayland_surface = NULL;
-    void *wayland_dpy = NULL;
-    void *wayland_window = NULL;
-
     const int32_t attr[] = {
         EGL_BUFFER_SIZE, 24,
         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
@@ -165,39 +221,29 @@ static bool gsr_egl_create_window(gsr_egl *self, bool wayland) {
     };
 
     if(wayland) {
-        wayland_dpy = wl_display_connect(NULL);
+        self->wayland.dpy = wl_display_connect(NULL);
-        if(!wayland_dpy) {
+        if(!self->wayland.dpy) {
             fprintf(stderr, "gsr error: gsr_egl_create_window failed: wl_display_connect failed\n");
             goto fail;
         }
 
-        wayland_registry = wl_display_get_registry(wayland_dpy); // TODO: Error checking
+        self->wayland.registry = wl_display_get_registry(self->wayland.dpy); // TODO: Error checking
-        wl_registry_add_listener(wayland_registry, &registry_listener, &wayland_compositor); // TODO: Error checking
+        wl_registry_add_listener(self->wayland.registry, &registry_listener, self); // TODO: Error checking
 
         // Fetch globals
-        wl_display_roundtrip(wayland_dpy);
+        wl_display_roundtrip(self->wayland.dpy);
 
         // fetch wl_output
-        wl_display_roundtrip(wayland_dpy);
+        wl_display_roundtrip(self->wayland.dpy);
 
-        if(!wayland_compositor) {
+        if(!self->wayland.compositor) {
             fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to find compositor\n");
             goto fail;
         }
-
-        /*if(!output) {
-            fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to find output\n");
-            goto fail;
-        }
-
-        if(!export_manager) {
-            fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to find export manager\n");
-            goto fail;
-        }*/
     } else {
-        x11_window = XCreateWindow(self->x11_dpy, DefaultRootWindow(self->x11_dpy), 0, 0, 16, 16, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
+        self->x11.window = XCreateWindow(self->x11.dpy, DefaultRootWindow(self->x11.dpy), 0, 0, 16, 16, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
 
-        if(!x11_window) {
+        if(!self->x11.window) {
             fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to create gl window\n");
             goto fail;
         }
@@ -205,78 +251,50 @@ static bool gsr_egl_create_window(gsr_egl *self, bool wayland) {
 
     self->eglBindAPI(EGL_OPENGL_ES_API);
 
-    egl_display = self->eglGetDisplay(wayland_dpy ? (EGLNativeDisplayType)wayland_dpy : (EGLNativeDisplayType)self->x11_dpy);
+    self->egl_display = self->eglGetDisplay(self->wayland.dpy ? (EGLNativeDisplayType)self->wayland.dpy : (EGLNativeDisplayType)self->x11.dpy);
-    if(!egl_display) {
+    if(!self->egl_display) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: eglGetDisplay failed\n");
         goto fail;
     }
 
-    if(!self->eglInitialize(egl_display, NULL, NULL)) {
+    if(!self->eglInitialize(self->egl_display, NULL, NULL)) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: eglInitialize failed\n");
         goto fail;
     }
     
-    if(!self->eglChooseConfig(egl_display, attr, &ecfg, 1, &num_config) || num_config != 1) {
+    if(!self->eglChooseConfig(self->egl_display, attr, &ecfg, 1, &num_config) || num_config != 1) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: failed to find a matching config\n");
         goto fail;
     }
     
-    egl_context = self->eglCreateContext(egl_display, ecfg, NULL, ctxattr);
+    self->egl_context = self->eglCreateContext(self->egl_display, ecfg, NULL, ctxattr);
-    if(!egl_context) {
+    if(!self->egl_context) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: failed to create egl context\n");
         goto fail;
     }
 
     if(wayland) {
-        wayland_surface = wl_compositor_create_surface(wayland_compositor);
+        self->wayland.surface = wl_compositor_create_surface(self->wayland.compositor);
-        wayland_window = wl_egl_window_create(wayland_surface, 16, 16);
+        self->wayland.window = wl_egl_window_create(self->wayland.surface, 16, 16);
-        egl_surface = self->eglCreateWindowSurface(egl_display, ecfg, (EGLNativeWindowType)wayland_window, NULL);
+        self->egl_surface = self->eglCreateWindowSurface(self->egl_display, ecfg, (EGLNativeWindowType)self->wayland.window, NULL);
     } else {
-        egl_surface = self->eglCreateWindowSurface(egl_display, ecfg, (EGLNativeWindowType)x11_window, NULL);
+        self->egl_surface = self->eglCreateWindowSurface(self->egl_display, ecfg, (EGLNativeWindowType)self->x11.window, NULL);
     }
 
-    if(!egl_surface) {
+    if(!self->egl_surface) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: failed to create window surface\n");
         goto fail;
     }
 
-    if(!self->eglMakeCurrent(egl_display, egl_surface, egl_surface, egl_context)) {
+    if(!self->eglMakeCurrent(self->egl_display, self->egl_surface, self->egl_surface, self->egl_context)) {
         fprintf(stderr, "gsr error: gsr_egl_create_window failed: failed to make context current\n");
         goto fail;
     }
 
-    self->egl_display = egl_display;
-    self->egl_surface = egl_surface;
-    self->egl_context = egl_context;
-
-    self->x11_window = x11_window;
-
-    self->wayland_dpy = wayland_dpy;
-    self->wayland_window = wayland_window;
-    self->wayland_surface = wayland_surface;
-    self->wayland_compositor = wayland_compositor;
-    self->wayland_registry = wayland_registry;
     return true;
 
     fail:
-    if(egl_context)
+    gsr_egl_unload(self);
-        self->eglDestroyContext(egl_display, egl_context);
-    if(egl_surface)
-        self->eglDestroySurface(egl_display, egl_surface);
-    if(egl_display)
-        self->eglTerminate(egl_display);
-    if(x11_window)
-        XDestroyWindow(self->x11_dpy, x11_window);
-    if(wayland_window)
-        wl_egl_window_destroy(wayland_window);
-    if(wayland_surface)
-        wl_surface_destroy(wayland_surface);
-    if(wayland_compositor)
-        wl_compositor_destroy(wayland_compositor);
-    if(wayland_registry)
-        wl_registry_destroy(wayland_registry);
-    if(wayland_dpy)
-        wl_display_disconnect(wayland_dpy);
     return false;
 }
 
@@ -387,7 +405,7 @@ static bool gsr_egl_load_gl(gsr_egl *self, void *library) {
 
 bool gsr_egl_load(gsr_egl *self, Display *dpy, bool wayland) {
     memset(self, 0, sizeof(gsr_egl));
-    self->x11_dpy = dpy;
+    self->x11.dpy = dpy;
 
     void *egl_lib = NULL;
     void *gl_lib = NULL;
@@ -449,34 +467,59 @@ void gsr_egl_unload(gsr_egl *self) {
         self->egl_display = NULL;
     }
 
-    if(self->x11_window) {
+    if(self->x11.window) {
-        XDestroyWindow(self->x11_dpy, self->x11_window);
+        XDestroyWindow(self->x11.dpy, self->x11.window);
-        self->x11_window = None;
+        self->x11.window = None;
     }
 
-    if(self->wayland_window) {
+    gsr_egl_cleanup_frame(self);
-        wl_egl_window_destroy(self->wayland_window);
+
-        self->wayland_window = NULL;
+    if(self->wayland.frame_callback) {
+        zwlr_export_dmabuf_frame_v1_destroy(self->wayland.frame_callback);
+        self->wayland.frame_callback = NULL;
     }
 
-    if(self->wayland_surface) {
+    if(self->wayland.export_manager) {
-        wl_surface_destroy(self->wayland_surface);
+        zwlr_export_dmabuf_manager_v1_destroy(self->wayland.export_manager);
-        self->wayland_surface = NULL;
+        self->wayland.export_manager = NULL;
     }
 
-    if(self->wayland_compositor) {
+    if(self->wayland.window) {
-        wl_compositor_destroy(self->wayland_compositor);
+        wl_egl_window_destroy(self->wayland.window);
-        self->wayland_compositor = NULL;
+        self->wayland.window = NULL;
     }
 
-    if(self->wayland_registry) {
+    if(self->wayland.surface) {
-        wl_registry_destroy(self->wayland_registry);
+        wl_surface_destroy(self->wayland.surface);
-        self->wayland_registry = NULL;
+        self->wayland.surface = NULL;
     }
 
-    if(self->wayland_dpy) {
+    for(int i = 0; i < self->wayland.num_outputs; ++i) {
-        wl_display_disconnect(self->wayland_dpy);
+        if(self->wayland.outputs[i].output) {
-        self->wayland_dpy = NULL;
+            wl_output_destroy(self->wayland.outputs[i].output);
+            self->wayland.outputs[i].output = NULL;
+        }
+
+        if(self->wayland.outputs[i].name) {
+            free(self->wayland.outputs[i].name);
+            self->wayland.outputs[i].name = NULL;
+        }
+    }
+    self->wayland.num_outputs = 0;
+
+    if(self->wayland.compositor) {
+        wl_compositor_destroy(self->wayland.compositor);
+        self->wayland.compositor = NULL;
+    }
+
+    if(self->wayland.registry) {
+        wl_registry_destroy(self->wayland.registry);
+        self->wayland.registry = NULL;
+    }
+
+    if(self->wayland.dpy) {
+        wl_display_disconnect(self->wayland.dpy);
+        self->wayland.dpy = NULL;
     }
 
     if(self->egl_library) {
@@ -492,15 +535,38 @@ void gsr_egl_unload(gsr_egl *self) {
     memset(self, 0, sizeof(gsr_egl));
 }
 
+bool gsr_egl_supports_wayland_capture(gsr_egl *self) {
+    return !!self->wayland.export_manager && self->wayland.num_outputs > 0;
+}
+
+bool gsr_egl_start_capture(gsr_egl *self, const char *monitor_to_capture) {
+    assert(monitor_to_capture);
+    if(!monitor_to_capture)
+        return false;
+
+    if(!self->wayland.dpy)
+        return false;
+
+    if(!gsr_egl_supports_wayland_capture(self))
+        return false;
+
+    self->wayland.output_to_capture = get_wayland_output_by_name(self, monitor_to_capture);
+    if(!self->wayland.output_to_capture)
+        return false;
+
+    frame_capture_output(self);
+    return true;
+}
+
 void gsr_egl_update(gsr_egl *self) {
-    if(!self->wayland_dpy)
+    if(!self->wayland.dpy)
         return;
 
-    wl_display_dispatch(self->wayland_dpy);
+    wl_display_dispatch(self->wayland.dpy);
 }
 
 void gsr_egl_cleanup_frame(gsr_egl *self) {
-    if(!self->wayland_dpy)
+    if(!self->wayland.dpy)
         return;
 
     if(self->fd > 0) {
@@ -508,8 +574,8 @@ void gsr_egl_cleanup_frame(gsr_egl *self) {
         self->fd = 0;
     }
 
-    /*if(current_frame) {
+    if(self->wayland.current_frame) {
-        zwlr_export_dmabuf_frame_v1_destroy(current_frame);
+        //zwlr_export_dmabuf_frame_v1_destroy(self->wayland.current_frame);
-        current_frame = NULL;
+        self->wayland.current_frame = NULL;
-    }*/
+    }
 }

src/main.cpp

@@ -1378,12 +1378,28 @@ int main(int argc, char **argv) {
     } else if(contains_non_hex_number(window_str)) {
         // TODO: wayland, not only drm (if wlroots)
         if(wayland) {
+            gsr_egl egl;
+            if(!gsr_egl_load(&egl, NULL, true)) {
+                fprintf(stderr, "gsr error: failed to load opengl\n");
+                _exit(1);
+            }
+
+            if(gsr_egl_supports_wayland_capture(&egl)) {
+                gsr_monitor gmon;
+                if(!get_monitor_by_name(&egl, GSR_CONNECTION_WAYLAND, window_str, &gmon)) {
+                    fprintf(stderr, "gsr error: display \"%s\" not found, expected one of:\n", window_str);
+                    for_each_active_monitor_output(&egl, GSR_CONNECTION_WAYLAND, monitor_output_callback_print, NULL);
+                    _exit(1);
+                }
+            } else {
                 gsr_monitor gmon;
                 if(!get_monitor_by_name(card_path, GSR_CONNECTION_DRM, window_str, &gmon)) {
                     fprintf(stderr, "gsr error: display \"%s\" not found, expected one of:\n", window_str);
                     for_each_active_monitor_output(card_path, GSR_CONNECTION_DRM, monitor_output_callback_print, NULL);
                     _exit(1);
                 }
+            }
+            gsr_egl_unload(&egl);
         } else {
             if(strcmp(window_str, "screen") != 0 && strcmp(window_str, "screen-direct") != 0 && strcmp(window_str, "screen-direct-force") != 0) {
                 gsr_monitor gmon;

src/utils.c

@@ -99,6 +99,26 @@ static bool connector_get_property_by_name(int drmfd, drmModeConnectorPtr props,
     return false;
 }
 
+static void for_each_active_monitor_output_wayland(gsr_egl *egl, active_monitor_callback callback, void *userdata) {
+    if(!gsr_egl_supports_wayland_capture(egl))
+        return;
+
+    for(int i = 0; i < egl->wayland.num_outputs; ++i) {
+        if(!egl->wayland.outputs[i].name)
+            continue;
+
+        gsr_monitor monitor = {
+            .name = egl->wayland.outputs[i].name,
+            .name_len = strlen(egl->wayland.outputs[i].name),
+            .pos = { .x = egl->wayland.outputs[i].pos.x, .y = egl->wayland.outputs[i].pos.y },
+            .size = { .x = egl->wayland.outputs[i].size.x, .y = egl->wayland.outputs[i].size.y },
+            .crt_info = NULL,
+            .connector_id = 0
+        };
+        callback(&monitor, userdata);
+    }
+}
+
 static void for_each_active_monitor_output_drm(const char *drm_card_path, active_monitor_callback callback, void *userdata) {
     int fd = open(drm_card_path, O_RDONLY);
     if(fd == -1)
@@ -162,7 +182,7 @@ void for_each_active_monitor_output(void *connection, gsr_connection_type connec
             for_each_active_monitor_output_x11(connection, callback, userdata);
             break;
         case GSR_CONNECTION_WAYLAND:
-            // TODO: use gsr_egl here (connection)
+            for_each_active_monitor_output_wayland(connection, callback, userdata);
             break;
         case GSR_CONNECTION_DRM:
             for_each_active_monitor_output_drm(connection, callback, userdata);