render: introduce renderer_get_render_buffer_caps

include/render/wlr_renderer.h

@@ -21,5 +21,11 @@ bool wlr_renderer_bind_buffer(struct wlr_renderer *r, struct wlr_buffer *buffer)
  */
 const struct wlr_drm_format_set *wlr_renderer_get_render_formats(
 	struct wlr_renderer *renderer);
+/**
+ * Get the supported buffer capabilities.
+ *
+ * This functions returns a bitfield of supported wlr_buffer_cap.
+ */
+uint32_t renderer_get_render_buffer_caps(struct wlr_renderer *renderer);
 
 #endif

include/wlr/render/interface.h

@@ -56,6 +56,7 @@ struct wlr_renderer_impl {
 	bool (*init_wl_display)(struct wlr_renderer *renderer,
 		struct wl_display *wl_display);
 	int (*get_drm_fd)(struct wlr_renderer *renderer);
+	uint32_t (*get_render_buffer_caps)(void);
 };
 
 void wlr_renderer_init(struct wlr_renderer *renderer,

render/gles2/renderer.c

@@ -17,6 +17,7 @@
 #include <wlr/util/log.h>
 #include "render/gles2.h"
 #include "render/pixel_format.h"
+#include "types/wlr_buffer.h"
 
 static const GLfloat verts[] = {
 	1, 0, // top right
@@ -526,6 +527,10 @@ static int gles2_get_drm_fd(struct wlr_renderer *wlr_renderer) {
 	return renderer->drm_fd;
 }
 
+static uint32_t gles2_get_render_buffer_caps(void) {
+	return WLR_BUFFER_CAP_DMABUF;
+}
+
 struct wlr_egl *wlr_gles2_renderer_get_egl(struct wlr_renderer *wlr_renderer) {
 	struct wlr_gles2_renderer *renderer =
 		gles2_get_renderer(wlr_renderer);
@@ -590,6 +595,7 @@ static const struct wlr_renderer_impl renderer_impl = {
 	.texture_from_dmabuf = gles2_texture_from_dmabuf,
 	.init_wl_display = gles2_init_wl_display,
 	.get_drm_fd = gles2_get_drm_fd,
+	.get_render_buffer_caps = gles2_get_render_buffer_caps,
 };
 
 void push_gles2_debug_(struct wlr_gles2_renderer *renderer,

render/pixman/renderer.c

@@ -403,6 +403,10 @@ static bool pixman_read_pixels(struct wlr_renderer *wlr_renderer,
 	return true;
 }
 
+static uint32_t pixman_get_render_buffer_caps(void) {
+	return WLR_BUFFER_CAP_DATA_PTR;
+}
+
 static const struct wlr_renderer_impl renderer_impl = {
 	.begin = pixman_begin,
 	.clear = pixman_clear,
@@ -416,6 +420,7 @@ static const struct wlr_renderer_impl renderer_impl = {
 	.destroy = pixman_destroy,
 	.preferred_read_format = pixman_preferred_read_format,
 	.read_pixels = pixman_read_pixels,
+	.get_render_buffer_caps = pixman_get_render_buffer_caps,
 };
 
 struct wlr_renderer *wlr_pixman_renderer_create(void) {

render/wlr_renderer.c

@@ -27,6 +27,7 @@ void wlr_renderer_init(struct wlr_renderer *renderer,
 	assert(impl->render_quad_with_matrix);
 	assert(impl->get_shm_texture_formats);
 	assert(impl->texture_from_pixels);
+	assert(impl->get_render_buffer_caps);
 	renderer->impl = impl;
 
 	wl_signal_init(&renderer->events.destroy);
@@ -174,6 +175,10 @@ const struct wlr_drm_format_set *wlr_renderer_get_render_formats(
 	return r->impl->get_render_formats(r);
 }
 
+uint32_t renderer_get_render_buffer_caps(struct wlr_renderer *r) {
+	return r->impl->get_render_buffer_caps();
+}
+
 bool wlr_renderer_read_pixels(struct wlr_renderer *r, uint32_t 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,