Implement drm (egl) buffer attaching

include/backend/egl.h

@@ -2,17 +2,72 @@
 #define WLR_BACKEND_EGL_H
 
 #include <EGL/egl.h>
+#include <EGL/eglext.h>
 #include <stdbool.h>
 
 struct wlr_egl {
 	EGLDisplay display;
 	EGLConfig config;
 	EGLContext context;
+
+	const char *egl_exts;
+	const char *gl_exts;
+
+	struct wl_display *wl_display;
 };
 
-const char *egl_error(void);
+/**
+ *  Initializes an egl context for the given platform and remote display.
+ * Will attempt to load all possibly required api functions.
+ */
 bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display);
+
+/**
+ * Frees all related egl resources, makes the context not-current and
+ * unbinds a bound wayland display.
+ */
 void wlr_egl_free(struct wlr_egl *egl);
+
+/**
+ * Binds the given display to the egl instance.
+ * This will allow clients to create egl surfaces from wayland ones and render to it.
+ */
+bool wlr_egl_bind_display(struct wlr_egl *egl, struct wl_display *local_display);
+
+/**
+ * Queries information about the given (potential egl/drm) buffer, returns
+ * the information in value.
+ * Refer to eglQueryWaylandBufferWL for more information about attrib and value.
+ * Makes only sense when a wl_display was bound to it since otherwise there
+ * cannot be any egl/drm buffers.
+ * Will only work after a wlr_egl objct was initialized and if the needed egl extension
+ * is present.
+ */
+bool wlr_egl_query_buffer(struct wl_resource *buf,
+	EGLint attrib, EGLint *value);
+
+/**
+ * Returns a surface for the given native window
+ * The window must match the remote display the wlr_egl was created with.
+ */
 EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window);
 
+/**
+ * Creates an egl image from the given client buffer and attributes.
+ * Will only work after a wlr_egl objct was initialized and if the needed egl extension
+ * is present.
+ */
+EGLImageKHR wlr_egl_create_image(EGLenum target, EGLClientBuffer buffer,
+	const EGLint *attribs);
+
+/**
+ * Destroys an egl image created with the given wlr_egl.
+ */
+bool wlr_egl_destroy_image(EGLImageKHR image);
+
+/**
+ * Returns a string for the last error ocurred with egl.
+ */
+const char *egl_error(void);
+
 #endif

include/render/gles2.h

@@ -4,9 +4,14 @@
 #include <string.h>
 #include <stdbool.h>
 #include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
 #include <wlr/render.h>
 #include <wlr/util/log.h>
 
+extern PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES;
+
 struct pixel_format {
 	uint32_t wl_format;
 	GLint gl_format, gl_type;
@@ -18,6 +23,7 @@ struct wlr_texture_state {
 	struct wlr_texture *wlr_texture;
 	GLuint tex_id;
 	const struct pixel_format *pixel_format;
+	EGLImageKHR image;
 };
 
 struct shaders {
@@ -25,6 +31,7 @@ struct shaders {
 	GLuint rgba, rgbx;
 	GLuint quad;
 	GLuint ellipse;
+	Gluint external;
 };
 
 extern struct shaders shaders;
@@ -39,6 +46,7 @@ extern const GLchar ellipse_fragment_src[];
 extern const GLchar vertex_src[];
 extern const GLchar fragment_src_rgba[];
 extern const GLchar fragment_src_rgbx[];
+extern const GLchar fragment_src_external[];
 
 bool _gles2_flush_errors(const char *file, int line);
 #define gles2_flush_errors(...) \

include/wlr/render.h

@@ -65,7 +65,7 @@ struct wlr_texture {
  * Copies pixels to this texture. The buffer is not accessed after this function
  * returns.
  */
-bool wlr_texture_upload_pixels(struct wlr_texture *surf,
+bool wlr_texture_upload_pixels(struct wlr_texture *tex,
 		enum wl_shm_format format, int stride, int width, int height,
 		const unsigned char *pixels);
 /**
@@ -80,8 +80,17 @@ bool wlr_texture_update_pixels(struct wlr_texture *surf,
  * Copies pixels from a wl_shm_buffer into this texture. The buffer is not
  * accessed after this function returns.
  */
-bool wlr_texture_upload_shm(struct wlr_texture *surf, uint32_t format,
+bool wlr_texture_upload_shm(struct wlr_texture *tex, uint32_t format,
 		struct wl_shm_buffer *shm);
+
+/**
+ * Attaches the contents from the given wl_drm wl_buffer resource onto the
+ * texture. The wl_resource is not used after this call.
+ * Will fail (return false) if the given resource is no drm buffer.
+ */
+ bool wlr_texture_upload_drm(struct wlr_texture *tex,
+ 	struct wl_resource *drm_buffer);
+
 /**
  * Copies a rectangle of pixels from a wl_shm_buffer onto the texture. The
  * buffer is not accessed after this function returns. Under some circumstances,

include/wlr/render/gles2.h

@@ -2,6 +2,7 @@
 #define _WLR_GLES2_RENDERER_H
 #include <wlr/render.h>
 
+struct wlr_egl;
 struct wlr_renderer *wlr_gles2_renderer_init();
 
 #endif

include/wlr/render/interface.h

@@ -42,7 +42,8 @@ struct wlr_texture_impl {
 		struct wl_shm_buffer *shm);
 	bool (*update_shm)(struct wlr_texture_state *surf, uint32_t format,
 		int x, int y, int width, int height, struct wl_shm_buffer *shm);
-	// TODO: egl
+	bool (*upload_drm)(struct wlr_texture_state *state,
+		struct wl_resource *drm_buf);
 	void (*get_matrix)(struct wlr_texture_state *state,
 		float (*matrix)[16], const float (*projection)[16], int x, int y);
 	void (*bind)(struct wlr_texture_state *state);