Split DRM rendering to its own file

backend/drm/backend.c

@@ -33,7 +33,7 @@ static void wlr_drm_backend_destroy(struct wlr_backend *_backend) {
 		wlr_output_destroy(&output->output);
 	}
 
-	wlr_drm_renderer_free(&backend->renderer);
+	wlr_drm_renderer_finish(&backend->renderer);
 	wlr_drm_resources_free(backend);
 	wlr_session_close_file(backend->session, backend->fd);
 	wl_event_source_remove(backend->drm_event);

backend/drm/drm.c

@@ -173,121 +173,9 @@ void wlr_drm_resources_free(struct wlr_drm_backend *backend) {
 	free(backend->planes);
 }
 
-bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd) {
-	renderer->gbm = gbm_create_device(fd);
-	if (!renderer->gbm) {
-		wlr_log(L_ERROR, "Failed to create GBM device: %s", strerror(errno));
-		return false;
-	}
-
-	if (!wlr_egl_init(&renderer->egl, EGL_PLATFORM_GBM_MESA,
-			GBM_FORMAT_ARGB8888, renderer->gbm)) {
-		gbm_device_destroy(renderer->gbm);
-		return false;
-	}
-
-	renderer->fd = fd;
-	return true;
-}
-
-void wlr_drm_renderer_free(struct wlr_drm_renderer *renderer) {
-	if (!renderer) {
-		return;
-	}
-
-	wlr_egl_free(&renderer->egl);
-	gbm_device_destroy(renderer->gbm);
-}
-
-static bool wlr_drm_plane_renderer_init(struct wlr_drm_renderer *renderer,
-		struct wlr_drm_plane *plane, uint32_t width, uint32_t height, uint32_t format, uint32_t flags) {
-	if (plane->width == width && plane->height == height) {
-		return true;
-	}
-
-	plane->width = width;
-	plane->height = height;
-
-	plane->gbm = gbm_surface_create(renderer->gbm, width, height,
-		format, GBM_BO_USE_RENDERING | flags);
-	if (!plane->gbm) {
-		wlr_log_errno(L_ERROR, "Failed to create GBM surface for plane");
-		return false;
-	}
-
-	plane->egl = wlr_egl_create_surface(&renderer->egl, plane->gbm);
-	if (plane->egl == EGL_NO_SURFACE) {
-		wlr_log(L_ERROR, "Failed to create EGL surface for plane");
-		return false;
-	}
-
-	return true;
-}
-
-static void wlr_drm_plane_renderer_free(struct wlr_drm_renderer *renderer,
-		struct wlr_drm_plane *plane) {
-	if (!renderer || !plane) {
-		return;
-	}
-
-	eglMakeCurrent(renderer->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
-
-	if (plane->front) {
-		gbm_surface_release_buffer(plane->gbm, plane->front);
-	}
-	if (plane->back) {
-		gbm_surface_release_buffer(plane->gbm, plane->back);
-	}
-
-	if (plane->egl) {
-		eglDestroySurface(renderer->egl.display, plane->egl);
-	}
-	if (plane->gbm) {
-		gbm_surface_destroy(plane->gbm);
-	}
-
-	if (plane->wlr_tex) {
-		wlr_texture_destroy(plane->wlr_tex);
-	}
-	if (plane->wlr_rend) {
-		wlr_renderer_destroy(plane->wlr_rend);
-	}
-	if (plane->cursor_bo) {
-		gbm_bo_destroy(plane->cursor_bo);
-	}
-
-	plane->width = 0;
-	plane->height = 0;
-	plane->egl = EGL_NO_SURFACE;
-	plane->gbm = NULL;
-	plane->front = NULL;
-	plane->back = NULL;
-	plane->wlr_rend = NULL;
-	plane->wlr_tex = NULL;
-	plane->cursor_bo = NULL;
-}
-
-static void wlr_drm_plane_make_current(struct wlr_drm_renderer *renderer,
-		struct wlr_drm_plane *plane) {
-	eglMakeCurrent(renderer->egl.display, plane->egl, plane->egl,
-		renderer->egl.context);
-}
-
-static void wlr_drm_plane_swap_buffers(struct wlr_drm_renderer *renderer,
-		struct wlr_drm_plane *plane) {
-	if (plane->front) {
-		gbm_surface_release_buffer(plane->gbm, plane->front);
-	}
-
-	eglSwapBuffers(renderer->egl.display, plane->egl);
-
-	plane->front = plane->back;
-	plane->back = gbm_surface_lock_front_buffer(plane->gbm);
-}
-
 static void wlr_drm_output_make_current(struct wlr_output *_output) {
 	struct wlr_drm_output *output = (struct wlr_drm_output *)_output;
-	wlr_drm_plane_make_current(output->renderer, output->crtc->primary);
+	wlr_drm_surface_make_current(output->renderer, &output->crtc->primary->surf);
 }
 
 static void wlr_drm_output_swap_buffers(struct wlr_output *_output) {
@@ -298,9 +186,8 @@ static void wlr_drm_output_swap_buffers(struct wlr_output *_output) {
 	struct wlr_drm_crtc *crtc = output->crtc;
 	struct wlr_drm_plane *plane = crtc->primary;
 
-	wlr_drm_plane_swap_buffers(renderer, plane);
-
-	uint32_t fb_id = get_fb_for_bo(plane->back);
+	struct gbm_bo *bo = wlr_drm_surface_swap_buffers(renderer, &plane->surf);
+	uint32_t fb_id = get_fb_for_bo(bo);
 
 	if (backend->iface->crtc_pageflip(backend, output, crtc, fb_id, NULL)) {
 		output->pageflip_pending = true;
@@ -338,17 +225,7 @@ void wlr_drm_output_start_renderer(struct wlr_drm_output *output) {
 	struct wlr_drm_crtc *crtc = output->crtc;
 	struct wlr_drm_plane *plane = crtc->primary;
 
-	struct gbm_bo *bo = plane->front;
-	if (!bo) {
-		// Render a black frame to start the rendering loop
-		wlr_drm_plane_make_current(renderer, plane);
-		glViewport(0, 0, plane->width, plane->height);
-		glClearColor(0.0, 0.0, 0.0, 1.0);
-		glClear(GL_COLOR_BUFFER_BIT);
-		wlr_drm_plane_swap_buffers(renderer, plane);
-
-		bo = plane->back;
-	}
+	struct gbm_bo *bo = wlr_drm_surface_get_front(renderer, &plane->surf);
 
 	struct wlr_drm_output_mode *_mode =
 		(struct wlr_drm_output_mode *)output->output.current_mode;
@@ -415,8 +292,10 @@ static void realloc_planes(struct wlr_drm_backend *backend, const uint32_t *crtc
 			struct wlr_drm_plane *new = &backend->type_planes[type][crtc_res[i]];
 
 			if (*old != new) {
-				wlr_drm_plane_renderer_free(&backend->renderer, *old);
-				wlr_drm_plane_renderer_free(&backend->renderer, new);
+				if (*old) {
+					wlr_drm_surface_finish(&backend->renderer, &(*old)->surf);
+				}
+				wlr_drm_surface_finish(&backend->renderer, &new->surf);
 				*old = new;
 			}
 		}
@@ -547,7 +426,7 @@ static bool wlr_drm_output_set_mode(struct wlr_output *_output,
 			continue;
 		}
 
-		if (!wlr_drm_plane_renderer_init(&backend->renderer, crtc->primary,
+		if (!wlr_drm_surface_init(&backend->renderer, &crtc->primary->surf,
 				mode->width, mode->height, GBM_FORMAT_XRGB8888,
 				GBM_BO_USE_SCANOUT)) {
 			wlr_log(L_ERROR, "Failed to initalise renderer for plane");
@@ -598,7 +477,7 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 		crtc->cursor = plane;
 	}
 
-	if (!plane->gbm) {
+	if (!plane->surf.gbm) {
 		int ret;
 		uint64_t w, h;
 		ret = drmGetCap(backend->fd, DRM_CAP_CURSOR_WIDTH, &w);
@@ -611,7 +490,7 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 			return false;
 		}
 
-		if (!wlr_drm_plane_renderer_init(renderer, plane, w, h, GBM_FORMAT_ARGB8888, 0)) {
+		if (!wlr_drm_surface_init(renderer, &plane->surf, w, h, GBM_FORMAT_ARGB8888, 0)) {
 			wlr_log(L_ERROR, "Cannot allocate cursor resources");
 			return false;
 		}
@@ -625,7 +504,7 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 
 		// OpenGL will read the pixels out upside down,
 		// so we need to flip the image vertically
-		wlr_matrix_texture(plane->matrix, plane->width, plane->height,
+		wlr_matrix_texture(plane->matrix, plane->surf.width, plane->surf.height,
 			output->output.transform ^ WL_OUTPUT_TRANSFORM_FLIPPED_180);
 
 		// TODO the image needs to be rotated depending on the output rotation
@@ -653,12 +532,12 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 		return false;
 	}
 
-	wlr_drm_plane_make_current(renderer, plane);
+	wlr_drm_surface_make_current(renderer, &plane->surf);
 
 	wlr_texture_upload_pixels(plane->wlr_tex, WL_SHM_FORMAT_ARGB8888,
 		stride, width, height, buf);
 
-	glViewport(0, 0, plane->width, plane->height);
+	glViewport(0, 0, plane->surf.width, plane->surf.height);
 	glClearColor(0.0, 0.0, 0.0, 0.0);
 	glClear(GL_COLOR_BUFFER_BIT);
 
@@ -668,10 +547,10 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 
 	glFinish();
 	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, bo_stride);
-	glReadPixels(0, 0, plane->width, plane->height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, bo_data);
+	glReadPixels(0, 0, plane->surf.width, plane->surf.height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, bo_data);
 	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0);
 
-	wlr_drm_plane_swap_buffers(renderer, plane);
+	wlr_drm_surface_swap_buffers(renderer, &plane->surf);
 
 	gbm_bo_unmap(bo, bo_data);
 
@@ -914,9 +793,9 @@ static void page_flip_handler(int fd, unsigned seq,
 	}
 
 	struct wlr_drm_plane *plane = output->crtc->primary;
-	if (plane->front) {
-		gbm_surface_release_buffer(plane->gbm, plane->front);
-		plane->front = NULL;
+	if (plane->surf.front) {
+		gbm_surface_release_buffer(plane->surf.gbm, plane->surf.front);
+		plane->surf.front = NULL;
 	}
 
 	if (backend->session->active) {
@@ -987,7 +866,7 @@ void wlr_drm_output_cleanup(struct wlr_drm_output *output) {
 	case WLR_DRM_OUTPUT_CLEANUP:;
 		struct wlr_drm_crtc *crtc = output->crtc;
 		for (int i = 0; i < 3; ++i) {
-			wlr_drm_plane_renderer_free(renderer, crtc->planes[i]);
+			wlr_drm_surface_finish(renderer, &crtc->planes[i]->surf);
 			if (crtc->planes[i] && crtc->planes[i]->id == 0) {
 				free(crtc->planes[i]);
 				crtc->planes[i] = NULL;

backend/drm/iface_atomic.c

@@ -84,10 +84,10 @@ static void set_plane_props(struct atomic *atom, struct wlr_drm_plane *plane,
 	// The src_* properties are in 16.16 fixed point
 	atomic_add(atom, id, props->src_x, 0);
 	atomic_add(atom, id, props->src_y, 0);
-	atomic_add(atom, id, props->src_w, plane->width << 16);
-	atomic_add(atom, id, props->src_h, plane->height << 16);
-	atomic_add(atom, id, props->crtc_w, plane->width);
-	atomic_add(atom, id, props->crtc_h, plane->height);
+	atomic_add(atom, id, props->src_w, plane->surf.width << 16);
+	atomic_add(atom, id, props->src_h, plane->surf.height << 16);
+	atomic_add(atom, id, props->crtc_w, plane->surf.width);
+	atomic_add(atom, id, props->crtc_h, plane->surf.height);
 	atomic_add(atom, id, props->fb_id, fb_id);
 	atomic_add(atom, id, props->crtc_id, crtc_id);
 	if (set_crtc_xy) {

backend/drm/iface_legacy.c

@@ -45,7 +45,7 @@ bool legacy_crtc_set_cursor(struct wlr_drm_backend *backend,
 	struct wlr_drm_plane *plane = crtc->cursor;
 
 	if (drmModeSetCursor(backend->fd, crtc->id, gbm_bo_get_handle(bo).u32,
-			plane->width, plane->height)) {
+			plane->surf.width, plane->surf.height)) {
 		wlr_log_errno(L_ERROR, "Failed to set hardware cursor");
 		return false;
 	}

backend/drm/renderer.c

@@ -0,0 +1,126 @@
+#include <stdbool.h>
+
+#include <gbm.h>
+#include <GLES2/gl2.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <wlr/egl.h>
+#include <wlr/util/log.h>
+#include "backend/drm/drm.h"
+
+bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd) {
+	renderer->gbm = gbm_create_device(fd);
+	if (!renderer->gbm) {
+		wlr_log(L_ERROR, "Failed to create GBM device");
+		return false;
+	}
+
+	if (!wlr_egl_init(&renderer->egl, EGL_PLATFORM_GBM_MESA,
+			GBM_FORMAT_ARGB8888, renderer->gbm)) {
+		gbm_device_destroy(renderer->gbm);
+		return false;
+	}
+
+	renderer->fd = fd;
+	return true;
+}
+
+void wlr_drm_renderer_finish(struct wlr_drm_renderer *renderer) {
+	if (!renderer) {
+		return;
+	}
+
+	wlr_egl_free(&renderer->egl);
+	gbm_device_destroy(renderer->gbm);
+}
+
+bool wlr_drm_surface_init(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf, uint32_t width, uint32_t height,
+		uint32_t format, uint32_t flags) {
+	if (surf->width == width && surf->height == height) {
+		return true;
+	}
+
+	surf->width = width;
+	surf->height = height;
+
+	surf->gbm = gbm_surface_create(renderer->gbm, width, height,
+		format, GBM_BO_USE_RENDERING | flags);
+	if (!surf->gbm) {
+		wlr_log_errno(L_ERROR, "Failed to create GBM surface");
+		goto error_zero;
+	}
+
+	surf->egl = wlr_egl_create_surface(&renderer->egl, surf->gbm);
+	if (surf->egl == EGL_NO_SURFACE) {
+		wlr_log(L_ERROR, "Failed to create EGL surface");
+		goto error_gbm;
+	}
+
+	return true;
+
+error_gbm:
+	gbm_surface_destroy(surf->gbm);
+error_zero:
+	memset(surf, 0, sizeof(*surf));
+	return false;
+}
+
+void wlr_drm_surface_finish(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (!renderer || !surf || !surf->gbm) {
+		return;
+	}
+
+	eglMakeCurrent(renderer->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+		EGL_NO_CONTEXT);
+
+	if (surf->front) {
+		gbm_surface_release_buffer(surf->gbm, surf->front);
+	}
+	if (surf->back) {
+		gbm_surface_release_buffer(surf->gbm, surf->back);
+	}
+
+	if (surf->egl) {
+		eglDestroySurface(renderer->egl.display, surf->egl);
+	}
+	if (surf->gbm) {
+		gbm_surface_destroy(surf->gbm);
+	}
+
+	memset(surf, 0, sizeof(*surf));
+}
+
+void wlr_drm_surface_make_current(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	eglMakeCurrent(renderer->egl.display, surf->egl, surf->egl,
+		renderer->egl.context);
+}
+
+struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (surf->front) {
+		gbm_surface_release_buffer(surf->gbm, surf->front);
+	}
+
+	eglSwapBuffers(renderer->egl.display, surf->egl);
+
+	surf->front = surf->back;
+	surf->back = gbm_surface_lock_front_buffer(surf->gbm);
+	return surf->back;
+}
+
+struct gbm_bo *wlr_drm_surface_get_front(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (surf->front) {
+		return surf->front;
+	}
+
+	wlr_drm_surface_make_current(renderer, surf);
+	glViewport(0, 0, surf->width, surf->height);
+	glClearColor(0.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+	return wlr_drm_surface_swap_buffers(renderer, surf);
+}

backend/meson.build

@@ -8,6 +8,7 @@ backend_files = files(
 	'drm/iface_atomic.c',
 	'drm/iface_legacy.c',
 	'drm/properties.c',
+	'drm/renderer.c',
 	'drm/util.c',
 	'libinput/backend.c',
 	'libinput/events.c',

include/backend/drm/drm.h

@@ -17,6 +17,7 @@
 
 #include "iface.h"
 #include "properties.h"
+#include "renderer.h"
 
 struct wlr_drm_plane {
 	uint32_t type;
@@ -24,13 +25,7 @@ struct wlr_drm_plane {
 
 	uint32_t possible_crtcs;
 
-	uint32_t width, height;
-
-	struct gbm_surface *gbm;
-	EGLSurface egl;
-
-	struct gbm_bo *front;
-	struct gbm_bo *back;
+	struct wlr_drm_surface surf;
 
 	// Only used by cursor
 	float matrix[16];
@@ -70,17 +65,6 @@ struct wlr_drm_connector {
 	struct wl_list link;
 };
 
-struct wlr_drm_renderer {
-	int fd;
-	struct gbm_device *gbm;
-	struct wlr_egl egl;
-};
-
-bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd);
-void wlr_drm_renderer_free(struct wlr_drm_renderer *renderer);
-
-struct wlr_drm_interface;
-
 struct wlr_drm_backend {
 	struct wlr_backend backend;
 

include/backend/drm/renderer.h

@@ -0,0 +1,47 @@
+#ifndef BACKEND_DRM_RENDERER_H
+#define BACKEND_DRM_RENDERER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <EGL/egl.h>
+#include <gbm.h>
+
+struct wlr_drm_renderer {
+	int fd;
+	struct gbm_device *gbm;
+	struct wlr_egl egl;
+};
+
+struct wlr_drm_surface {
+	uint32_t width;
+	uint32_t height;
+
+	struct gbm_surface *gbm;
+	EGLSurface egl;
+
+	struct gbm_bo *front;
+	struct gbm_bo *back;
+};
+
+bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd);
+
+void wlr_drm_renderer_finish(struct wlr_drm_renderer *renderer);
+
+bool wlr_drm_surface_init(struct wlr_drm_renderer *renderer,
+	struct wlr_drm_surface *surf, uint32_t width, uint32_t height,
+	uint32_t format, uint32_t flags);
+
+void wlr_drm_surface_finish(struct wlr_drm_renderer *renderer,
+	struct wlr_drm_surface *surf);
+
+void wlr_drm_surface_make_current(struct wlr_drm_renderer *renderer,
+	struct wlr_drm_surface *surf);
+
+struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_renderer *renderer,
+	struct wlr_drm_surface *surf);
+
+struct gbm_bo *wlr_drm_surface_get_front(struct wlr_drm_renderer *renderer,
+	struct wlr_drm_surface *surf);
+
+#endif