Add a more complete implementation

Support multiple planes, and modifiers.

And make this a backend API.

gdk/gdkglcontext.c

@@ -1258,3 +1258,21 @@ gdk_gl_context_use_es_bgra (GdkGLContext *context)
 
   return FALSE;
 }
+
+GdkTexture *
+gdk_gl_context_import_dmabuf (GdkGLContext *context,
+                              int           fd,
+                              int           fourcc,
+                              int           width,
+                              int           height,
+                              int           offset,
+                              int           stride)
+{
+  if (GDK_GL_CONTEXT_GET_CLASS (context)->import_dmabuf)
+    return GDK_GL_CONTEXT_GET_CLASS (context)->import_dmabuf (context,
+                                                              fd, fourcc,
+                                                              width, height,
+                                                              offset, stride);
+
+  return NULL;
+}

gdk/gdkglcontext.h

@@ -90,6 +90,15 @@ GdkGLContext *          gdk_gl_context_get_current              (void);
 GDK_AVAILABLE_IN_ALL
 void                    gdk_gl_context_clear_current            (void);
 
+GDK_AVAILABLE_IN_4_4
+GdkTexture *            gdk_gl_context_import_dmabuf (GdkGLContext *context,
+                                                      int           fd,
+                                                      int           fourcc,
+                                                      int           width,
+                                                      int           height,
+                                                      int           offset,
+                                                      int           stride);
+
 G_END_DECLS
 
 #endif /* __GDK_GL_CONTEXT_H__ */

gdk/gdkglcontextprivate.h

@@ -45,10 +45,18 @@ struct _GdkGLContextClass
 {
   GdkDrawContextClass parent_class;
 
-  gboolean (* realize) (GdkGLContext *context,
-                        GError **error);
+  gboolean (* realize) (GdkGLContext  *context,
+                        GError       **error);
 
   cairo_region_t * (* get_damage) (GdkGLContext *context);
+
+  GdkTexture * (* import_dmabuf) (GdkGLContext *context,
+                                  int           fd,
+                                  int           fourcc,
+                                  int           width,
+                                  int           height,
+                                  int           offset,
+                                  int           stride);
 };
 
 typedef struct {

gdk/wayland/gdkglcontext-wayland.c

@@ -313,6 +313,181 @@ gdk_wayland_gl_context_end_frame (GdkDrawContext *draw_context,
   gdk_wayland_surface_notify_committed (surface);
 }
 
+int
+gdk_wayland_gl_context_import_dmabuf (GdkGLContext   *context,
+                                      uint32_t        format,
+                                      unsigned int    width,
+                                      unsigned int    height,
+                                      uint32_t        n_planes,
+                                      const int      *fds,
+                                      const uint32_t *strides,
+                                      const uint32_t *offsets,
+                                      const uint64_t *modifiers)
+{
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
+  guint texture;
+  EGLint attribs[2 * (3 + 4 * 5) + 1];
+  int i;
+  EGLImage image;
+
+  g_return_val_if_fail (GDK_IS_WAYLAND_GL_CONTEXT (context), 0);
+  g_return_val_if_fail (0 < n_planes && n_planes <= 4, 0);
+
+  i = 0;
+  attribs[i++] = EGL_WIDTH;
+  attribs[i++] = width;
+  attribs[i++] = EGL_HEIGHT;
+  attribs[i++] = height;
+  attribs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
+  attribs[i++] = format;
+
+  if (n_planes > 0)
+    {
+      attribs[i++] = EGL_DMA_BUF_PLANE0_FD_EXT;
+      attribs[i++] = fds[0];
+      attribs[i++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
+      attribs[i++] = offsets[0];
+      attribs[i++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
+      attribs[i++] = strides[0];
+      if (modifiers)
+        {
+          attribs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
+          attribs[i++] = modifiers[0] & 0xFFFFFFFF;
+          attribs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
+          attribs[i++] = modifiers[0] >> 32;
+        }
+    }
+
+  if (n_planes > 1)
+    {
+      attribs[i++] = EGL_DMA_BUF_PLANE1_FD_EXT;
+      attribs[i++] = fds[1];
+      attribs[i++] = EGL_DMA_BUF_PLANE1_OFFSET_EXT;
+      attribs[i++] = offsets[1];
+      attribs[i++] = EGL_DMA_BUF_PLANE1_PITCH_EXT;
+      attribs[i++] = strides[1];
+      if (modifiers)
+        {
+          attribs[i++] = EGL_DMA_BUF_PLANE1_MODIFIER_LO_EXT;
+          attribs[i++] = modifiers[1] & 0xFFFFFFFF;
+          attribs[i++] = EGL_DMA_BUF_PLANE1_MODIFIER_HI_EXT;
+          attribs[i++] = modifiers[1] >> 32;
+        }
+    }
+
+  if (n_planes > 2)
+    {
+      attribs[i++] = EGL_DMA_BUF_PLANE2_FD_EXT;
+      attribs[i++] = fds[2];
+      attribs[i++] = EGL_DMA_BUF_PLANE2_OFFSET_EXT;
+      attribs[i++] = offsets[2];
+      attribs[i++] = EGL_DMA_BUF_PLANE2_PITCH_EXT;
+      attribs[i++] = strides[2];
+      if (modifiers)
+        {
+          attribs[i++] = EGL_DMA_BUF_PLANE2_MODIFIER_LO_EXT;
+          attribs[i++] = modifiers[2] & 0xFFFFFFFF;
+          attribs[i++] = EGL_DMA_BUF_PLANE2_MODIFIER_HI_EXT;
+          attribs[i++] = modifiers[2] >> 32;
+        }
+    }
+
+  if (n_planes > 3)
+    {
+      attribs[i++] = EGL_DMA_BUF_PLANE3_FD_EXT;
+      attribs[i++] = fds[3];
+      attribs[i++] = EGL_DMA_BUF_PLANE3_OFFSET_EXT;
+      attribs[i++] = offsets[3];
+      attribs[i++] = EGL_DMA_BUF_PLANE3_PITCH_EXT;
+      attribs[i++] = strides[3];
+      if (modifiers)
+        {
+          attribs[i++] = EGL_DMA_BUF_PLANE3_MODIFIER_LO_EXT;
+          attribs[i++] = modifiers[3] & 0xFFFFFFFF;
+          attribs[i++] = EGL_DMA_BUF_PLANE3_MODIFIER_HI_EXT;
+          attribs[i++] = modifiers[3] >> 32;
+        }
+    }
+
+  attribs[i++] = EGL_NONE;
+
+  image = eglCreateImageKHR (display_wayland->egl_display,
+                             EGL_NO_CONTEXT,
+                             EGL_LINUX_DMA_BUF_EXT,
+                             (EGLClientBuffer)NULL,
+                             attribs);
+  if (image == EGL_NO_IMAGE)
+    {
+      switch (eglGetError ())
+        {
+#define EGL_ERROR(name) \
+  case name: \
+    g_print (#name); \
+    break;
+
+        EGL_ERROR(EGL_NOT_INITIALIZED)
+        EGL_ERROR(EGL_BAD_ACCESS)
+        EGL_ERROR(EGL_BAD_ALLOC)
+        EGL_ERROR(EGL_BAD_ATTRIBUTE)
+        EGL_ERROR(EGL_BAD_CONTEXT)
+        EGL_ERROR(EGL_BAD_CONFIG)
+        EGL_ERROR(EGL_BAD_CURRENT_SURFACE)
+        EGL_ERROR(EGL_BAD_DISPLAY)
+        EGL_ERROR(EGL_BAD_SURFACE)
+        EGL_ERROR(EGL_BAD_MATCH)
+        EGL_ERROR(EGL_BAD_PARAMETER)
+        EGL_ERROR(EGL_BAD_NATIVE_PIXMAP)
+        EGL_ERROR(EGL_BAD_NATIVE_WINDOW)
+        EGL_ERROR(EGL_CONTEXT_LOST)
+        default:
+          g_print ("error: %d\n", eglGetError ());
+          break;
+        }
+
+      return 0;
+    }
+
+  gdk_gl_context_make_current (context);
+
+  glGenTextures (1, &texture);
+  glBindTexture (GL_TEXTURE_2D, texture);
+  glEGLImageTargetTexture2DOES (GL_TEXTURE_2D, image);
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+  eglDestroyImage (display_wayland->egl_display, image);
+
+  return texture;
+}
+
+static GdkTexture *
+import_dmabuf (GdkGLContext *context,
+               int           fd,
+               int           fourcc,
+               int           width,
+               int           height,
+               int           offset,
+               int           stride)
+{
+  int texture;
+
+  texture = gdk_wayland_gl_context_import_dmabuf (context,
+                                                  fourcc,
+                                                  width,
+                                                  height,
+                                                  1,
+                                                  (const int *)&fd,
+                                                  (const uint32_t *)&stride,
+                                                  (const uint32_t *)&offset,
+                                                  NULL);
+
+  return gdk_gl_texture_new (context,
+                             texture,
+                             width, height,
+                             NULL, NULL);
+}
+
 static void
 gdk_wayland_gl_context_class_init (GdkWaylandGLContextClass *klass)
 {
@@ -326,6 +501,8 @@ gdk_wayland_gl_context_class_init (GdkWaylandGLContextClass *klass)
 
   context_class->realize = gdk_wayland_gl_context_realize;
   context_class->get_damage = gdk_wayland_gl_context_get_damage;
+
+  context_class->import_dmabuf = import_dmabuf;
 }
 
 static void
@@ -576,3 +753,4 @@ gdk_wayland_display_make_gl_context_current (GdkDisplay   *display,
 
   return TRUE;
 }
+

gdk/wayland/gdkwaylandglcontext.h

@@ -32,7 +32,7 @@ G_BEGIN_DECLS
 
 #define GDK_TYPE_WAYLAND_GL_CONTEXT		(gdk_wayland_gl_context_get_type ())
 #define GDK_WAYLAND_GL_CONTEXT(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GDK_TYPE_WAYLAND_GL_CONTEXT, GdkWaylandGLContext))
-#define GDK_WAYLAND_IS_GL_CONTEXT(obj)	(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_WAYLAND_GL_CONTEXT))
+#define GDK_IS_WAYLAND_GL_CONTEXT(obj)	(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_WAYLAND_GL_CONTEXT))
 
 typedef struct _GdkWaylandGLContext		GdkWaylandGLContext;
 typedef struct _GdkWaylandGLContextClass	GdkWaylandGLContextClass;
@@ -40,6 +40,17 @@ typedef struct _GdkWaylandGLContextClass	GdkWaylandGLContextClass;
 GDK_AVAILABLE_IN_ALL
 GType gdk_wayland_gl_context_get_type (void) G_GNUC_CONST;
 
+GDK_AVAILABLE_IN_4_4
+int   gdk_wayland_gl_context_import_dmabuf (GdkGLContext   *context,
+                                            uint32_t        fourcc,
+                                            unsigned int    width,
+                                            unsigned int    height,
+                                            uint32_t        n_planes,
+                                            const int      *fd,
+                                            const uint32_t *stride,
+                                            const uint32_t *offset,
+                                            const uint64_t *modifiers);
+
 G_END_DECLS
 
 #endif /* __GDK_WAYLAND_GL_CONTEXT_H__ */

gdk/x11/gdkglcontext-x11.c

@@ -40,6 +40,8 @@
 #include <cairo-xlib.h>
 
 #include <epoxy/glx.h>
+#include <epoxy/egl.h>
+
 
 G_DEFINE_TYPE (GdkX11GLContext, gdk_x11_gl_context, GDK_TYPE_GL_CONTEXT)
 
@@ -710,6 +712,94 @@ gdk_x11_gl_context_dispose (GObject *gobject)
   G_OBJECT_CLASS (gdk_x11_gl_context_parent_class)->dispose (gobject);
 }
 
+typedef struct {
+  EGLDisplay display;
+  EGLImage image;
+} ImageData;
+
+static void
+free_image (gpointer data)
+{
+  ImageData *idata = data;
+  eglDestroyImage (idata->display, idata->image);
+  g_free (data);
+}
+
+static GdkTexture *
+gdk_x11_gl_context_import_dmabuf (GdkGLContext *context,
+                                  int           fd,
+                                  int           fourcc,
+                                  int           width,
+                                  int           height,
+                                  int           offset,
+                                  int           stride)
+{
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
+  guint texture;
+  const EGLAttrib attribute_list[] = {
+    EGL_WIDTH, width,
+    EGL_HEIGHT, height,
+    EGL_LINUX_DRM_FOURCC_EXT, fourcc,
+    EGL_DMA_BUF_PLANE0_FD_EXT, fd,
+    EGL_DMA_BUF_PLANE0_OFFSET_EXT, offset,
+    EGL_DMA_BUF_PLANE0_PITCH_EXT, stride,
+    EGL_NONE
+  };
+  EGLDisplay egl_display;
+  EGLImage image;
+  ImageData *idata;
+  int major, minor;
+
+  gdk_gl_context_make_current (context);
+
+  egl_display = eglGetDisplay ((EGLNativeDisplayType) display_x11->xdisplay);
+
+  if (!eglInitialize (egl_display, &major, &minor))
+    {
+      g_warning ("Failed to initialize EGL: %x", eglGetError());
+      return NULL;
+    }
+  if (!eglBindAPI(EGL_OPENGL_API))
+    {
+      g_warning ("Failed to bind EGL API: %x", eglGetError());
+      return NULL;
+    }
+
+  g_message ("EGL API version %d.%d found\n"
+             " - Vendor: %s\n"
+             " - Version: %s\n"
+             " - Client APIs: %s\n"
+             " - Extensions:\n"
+             "\t%s",
+             major, minor,
+             eglQueryString (egl_display, EGL_VENDOR),
+             eglQueryString (egl_display, EGL_VERSION),
+             eglQueryString (egl_display, EGL_CLIENT_APIS),
+             eglQueryString (egl_display, EGL_EXTENSIONS));
+
+  image = eglCreateImage (egl_display,
+                          EGL_NO_CONTEXT,
+                          EGL_LINUX_DMA_BUF_EXT,
+                          (EGLClientBuffer)NULL,
+                          attribute_list);
+  if (image == EGL_NO_IMAGE)
+    return NULL;
+
+  glGenTextures (1, &texture);
+  glBindTexture (GL_TEXTURE_2D, texture);
+  glEGLImageTargetTexture2DOES (GL_TEXTURE_2D, image);
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+  idata = g_new (ImageData, 1);
+
+  idata->display = egl_display;
+  idata->image = image;
+
+  return gdk_gl_texture_new (context, texture, width, height, free_image, idata);
+}
+
 static void
 gdk_x11_gl_context_class_init (GdkX11GLContextClass *klass)
 {
@@ -719,6 +809,7 @@ gdk_x11_gl_context_class_init (GdkX11GLContextClass *klass)
 
   context_class->realize = gdk_x11_gl_context_realize;
   context_class->get_damage = gdk_x11_gl_context_get_damage;
+  context_class->import_dmabuf = gdk_x11_gl_context_import_dmabuf;
 
   draw_context_class->end_frame = gdk_x11_gl_context_end_frame;