render/gles2: implement texture_from_buffer

Make it so wlr_gles2_texture is ref'counted (via wlr_buffer). This
is similar to wlr_gles2_buffer or wlr_drm_fb work.

When creating a wlr_texture from a wlr_buffer, first check if we
already have a texture for the buffer. If so, increase the
wlr_buffer ref'count and make sure any changes made by an external
process are made visible (by invalidating the texture).

When destroying a wlr_texture created from a wlr_buffer, decrease
the ref'count, but keep the wlr_texture around in case the caller
uses it again. When the wlr_buffer is destroyed, cleanup the
wlr_texture.

1 files changed, 6 insertions, 0 deletions

diff --git a/include/render/gles2.h b/include/render/gles2.h
index 450235f0..39ec1da0 100644
--- a/include/render/gles2.h
+++ b/include/render/gles2.h
@@ -103,6 +103,10 @@ struct wlr_gles2_texture {
 
 	// Only affects target == GL_TEXTURE_2D
 	uint32_t drm_format; // used to interpret upload data
+	// If imported from a wlr_buffer
+	struct wlr_buffer *buffer;
+
+	struct wl_listener buffer_destroy;
 };
 
 const struct wlr_gles2_pixel_format *get_gles2_format_from_drm(uint32_t fmt);
@@ -122,6 +126,8 @@ struct wlr_texture *gles2_texture_from_wl_drm(struct wlr_renderer *wlr_renderer,
 	struct wl_resource *data);
 struct wlr_texture *gles2_texture_from_dmabuf(struct wlr_renderer *wlr_renderer,
 	struct wlr_dmabuf_attributes *attribs);
+struct wlr_texture *gles2_texture_from_buffer(struct wlr_renderer *wlr_renderer,
+	struct wlr_buffer *buffer);
 
 void push_gles2_debug_(struct wlr_gles2_renderer *renderer,
 	const char *file, const char *func);