render: introduce wlr_renderer_get_dmabuf_render_formats

It describes which DMA-BUF formats can be used to render.

include/render/wlr_renderer.h

@@ -4,5 +4,11 @@
 #include <wlr/render/wlr_renderer.h>
 
 bool wlr_renderer_bind_buffer(struct wlr_renderer *r, struct wlr_buffer *buffer);
+/**
+ * Get the DMA-BUF formats supporting rendering usage. Buffers allocated with
+ * a format from this list may be attached via wlr_renderer_bind_buffer.
+ */
+const struct wlr_drm_format_set *wlr_renderer_get_dmabuf_render_formats(
+	struct wlr_renderer *renderer);
 
 #endif

include/wlr/render/egl.h

@@ -78,6 +78,7 @@ struct wlr_egl {
 	struct wl_display *wl_display;
 
 	struct wlr_drm_format_set dmabuf_formats;
+	struct wlr_drm_format_set dmabuf_render_formats;
 	EGLBoolean **external_only_dmabuf_formats;
 };
 
@@ -126,6 +127,11 @@ EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
  * Get DMA-BUF formats suitable for sampling usage.
  */
 const struct wlr_drm_format_set *wlr_egl_get_dmabuf_formats(struct wlr_egl *egl);
+/**
+ * Get DMA-BUF formats suitable for rendering usage.
+ */
+const struct wlr_drm_format_set *wlr_egl_get_dmabuf_render_formats(
+	struct wlr_egl *egl);
 
 bool wlr_egl_export_image_to_dmabuf(struct wlr_egl *egl, EGLImageKHR image,
 	int32_t width, int32_t height, uint32_t flags,

include/wlr/render/interface.h

@@ -52,6 +52,8 @@ struct wlr_renderer_impl {
 		struct wl_resource *buffer, int *width, int *height);
 	const struct wlr_drm_format_set *(*get_dmabuf_formats)(
 		struct wlr_renderer *renderer);
+	const struct wlr_drm_format_set *(*get_dmabuf_render_formats)(
+		struct wlr_renderer *renderer);
 	enum wl_shm_format (*preferred_read_format)(struct wlr_renderer *renderer);
 	bool (*read_pixels)(struct wlr_renderer *renderer, enum wl_shm_format fmt,
 		uint32_t *flags, uint32_t stride, uint32_t width, uint32_t height,

render/egl.c

@@ -158,10 +158,16 @@ static void init_dmabuf_formats(struct wlr_egl *egl) {
 
 		if (modifiers_len == 0) {
 			wlr_drm_format_set_add(&egl->dmabuf_formats, fmt, DRM_FORMAT_MOD_INVALID);
+			wlr_drm_format_set_add(&egl->dmabuf_render_formats, fmt,
+				DRM_FORMAT_MOD_INVALID);
 		}
 
 		for (int j = 0; j < modifiers_len; j++) {
 			wlr_drm_format_set_add(&egl->dmabuf_formats, fmt, modifiers[j]);
+			if (!external_only[j]) {
+				wlr_drm_format_set_add(&egl->dmabuf_render_formats, fmt,
+					modifiers[j]);
+			}
 		}
 
 		free(modifiers);
@@ -397,6 +403,7 @@ void wlr_egl_finish(struct wlr_egl *egl) {
 	}
 	free(egl->external_only_dmabuf_formats);
 
+	wlr_drm_format_set_finish(&egl->dmabuf_render_formats);
 	wlr_drm_format_set_finish(&egl->dmabuf_formats);
 
 	eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
@@ -809,6 +816,11 @@ const struct wlr_drm_format_set *wlr_egl_get_dmabuf_formats(struct wlr_egl *egl)
 	return &egl->dmabuf_formats;
 }
 
+const struct wlr_drm_format_set *wlr_egl_get_dmabuf_render_formats(
+		struct wlr_egl *egl) {
+	return &egl->dmabuf_render_formats;
+}
+
 bool wlr_egl_export_image_to_dmabuf(struct wlr_egl *egl, EGLImageKHR image,
 		int32_t width, int32_t height, uint32_t flags,
 		struct wlr_dmabuf_attributes *attribs) {

render/gles2/renderer.c

@@ -435,6 +435,12 @@ static const struct wlr_drm_format_set *gles2_get_dmabuf_formats(
 	return wlr_egl_get_dmabuf_formats(renderer->egl);
 }
 
+static const struct wlr_drm_format_set *gles2_get_dmabuf_render_formats(
+		struct wlr_renderer *wlr_renderer) {
+	struct wlr_gles2_renderer *renderer = gles2_get_renderer(wlr_renderer);
+	return wlr_egl_get_dmabuf_render_formats(renderer->egl);
+}
+
 static enum wl_shm_format gles2_preferred_read_format(
 		struct wlr_renderer *wlr_renderer) {
 	struct wlr_gles2_renderer *renderer =
@@ -703,6 +709,7 @@ static const struct wlr_renderer_impl renderer_impl = {
 	.resource_is_wl_drm_buffer = gles2_resource_is_wl_drm_buffer,
 	.wl_drm_buffer_get_size = gles2_wl_drm_buffer_get_size,
 	.get_dmabuf_formats = gles2_get_dmabuf_formats,
+	.get_dmabuf_render_formats = gles2_get_dmabuf_render_formats,
 	.preferred_read_format = gles2_preferred_read_format,
 	.read_pixels = gles2_read_pixels,
 	.texture_from_pixels = gles2_texture_from_pixels,

render/wlr_renderer.c

@@ -173,6 +173,14 @@ const struct wlr_drm_format_set *wlr_renderer_get_dmabuf_formats(
 	return r->impl->get_dmabuf_formats(r);
 }
 
+const struct wlr_drm_format_set *wlr_renderer_get_dmabuf_render_formats(
+		struct wlr_renderer *r) {
+	if (!r->impl->get_dmabuf_render_formats) {
+		return NULL;
+	}
+	return r->impl->get_dmabuf_render_formats(r);
+}
+
 bool wlr_renderer_read_pixels(struct wlr_renderer *r, enum wl_shm_format fmt,
 		uint32_t *flags, uint32_t stride, uint32_t width, uint32_t height,
 		uint32_t src_x, uint32_t src_y, uint32_t dst_x, uint32_t dst_y,