Redesign wlr_texture

- Textures are now immutable (apart from those created from raw
  pixels), no more invalid textures
- Move all wl_drm stuff in wlr_renderer
- Most of wlr_texture fields are now private
- Remove some duplicated DMA-BUF code in the DRM backend
- Add more assertions
- Stride is now always given as bytes rather than pixels
- Drop wl_shm functions

Fun fact: this patch has been written 10,000 meters up in the air.

backend/drm/drm.c

@@ -181,9 +181,6 @@ void wlr_drm_resources_free(struct wlr_drm_backend *drm) {
 		if (plane->cursor_bo) {
 			gbm_bo_destroy(plane->cursor_bo);
 		}
-		if (plane->wlr_tex) {
-			wlr_texture_destroy(plane->wlr_tex);
-		}
 	}
 
 	free(drm->crtcs);
@@ -586,12 +583,6 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 			wlr_output_transform_invert(output->transform);
 		wlr_matrix_projection(plane->matrix, plane->surf.width,
 			plane->surf.height, transform);
-
-		plane->wlr_tex =
-			wlr_render_texture_create(plane->surf.renderer->wlr_rend);
-		if (!plane->wlr_tex) {
-			return false;
-		}
 	}
 
 	struct wlr_box hotspot = { .x = hotspot_x, .y = hotspot_y };
@@ -637,13 +628,18 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 
 		wlr_drm_surface_make_current(&plane->surf, NULL);
 
-		wlr_texture_upload_pixels(plane->wlr_tex, WL_SHM_FORMAT_ARGB8888,
-			stride, width, height, buf);
-
 		struct wlr_renderer *rend = plane->surf.renderer->wlr_rend;
+
+		struct wlr_texture *texture = wlr_texture_from_pixels(rend,
+			WL_SHM_FORMAT_ARGB8888, stride, width, height, buf);
+		if (texture == NULL) {
+			wlr_log(L_ERROR, "Unable to create texture");
+			return false;
+		}
+
 		wlr_renderer_begin(rend, plane->surf.width, plane->surf.height);
 		wlr_renderer_clear(rend, (float[]){ 0.0, 0.0, 0.0, 0.0 });
-		wlr_render_texture(rend, plane->wlr_tex, plane->matrix, 0, 0, 1.0f);
+		wlr_render_texture(rend, texture, plane->matrix, 0, 0, 1.0f);
 		wlr_renderer_end(rend);
 
 		wlr_renderer_read_pixels(rend, WL_SHM_FORMAT_ARGB8888, bo_stride,
@@ -651,6 +647,7 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 
 		wlr_drm_surface_swap_buffers(&plane->surf, NULL);
 
+		wlr_texture_destroy(texture);
 		gbm_bo_unmap(plane->cursor_bo, bo_data);
 	}
 

backend/drm/renderer.c

@@ -178,47 +178,33 @@ static void free_eglimage(struct gbm_bo *bo, void *data) {
 static struct wlr_texture *get_tex_for_bo(struct wlr_drm_renderer *renderer,
 		struct gbm_bo *bo) {
 	struct tex *tex = gbm_bo_get_user_data(bo);
-	if (tex) {
+	if (tex != NULL) {
 		return tex->tex;
 	}
 
-	// TODO: use wlr_texture_upload_dmabuf instead
-
-	tex = malloc(sizeof(*tex));
-	if (!tex) {
-		wlr_log_errno(L_ERROR, "Allocation failed");
+	tex = calloc(1, sizeof(struct tex));
+	if (tex == NULL) {
 		return NULL;
 	}
 
-	tex->egl = &renderer->egl;
-
-	int dmabuf_fd = gbm_bo_get_fd(bo);
-	uint32_t width = gbm_bo_get_width(bo);
-	uint32_t height = gbm_bo_get_height(bo);
-
-	EGLint attribs[] = {
-		EGL_WIDTH, width,
-		EGL_HEIGHT, height,
-		EGL_LINUX_DRM_FOURCC_EXT, gbm_bo_get_format(bo),
-		EGL_DMA_BUF_PLANE0_FD_EXT, dmabuf_fd,
-		EGL_DMA_BUF_PLANE0_OFFSET_EXT, gbm_bo_get_offset(bo, 0),
-		EGL_DMA_BUF_PLANE0_PITCH_EXT, gbm_bo_get_stride_for_plane(bo, 0),
-		EGL_IMAGE_PRESERVED_KHR, EGL_FALSE,
-		EGL_NONE,
+	struct wlr_dmabuf_buffer_attribs attribs = {
+		.n_planes = 1,
+		.width = gbm_bo_get_width(bo),
+		.height = gbm_bo_get_height(bo),
+		.format = gbm_bo_get_format(bo),
 	};
+	attribs.offset[0] = 0;
+	attribs.stride[0] = gbm_bo_get_stride_for_plane(bo, 0);
+	attribs.modifier[0] = 0;
+	attribs.fd[0] = gbm_bo_get_fd(bo);
 
-	tex->img = eglCreateImageKHR(renderer->egl.display, EGL_NO_CONTEXT,
-		EGL_LINUX_DMA_BUF_EXT, NULL, attribs);
-	if (!tex->img) {
-		wlr_log(L_ERROR, "Failed to create EGL image");
-		abort();
+	tex->tex = wlr_texture_from_dmabuf(renderer->wlr_rend, &attribs);
+	if (tex->tex == NULL) {
+		free(tex);
+		return NULL;
 	}
 
-	tex->tex = wlr_render_texture_create(renderer->wlr_rend);
-	wlr_texture_upload_eglimage(tex->tex, tex->img, width, height);
-
 	gbm_bo_set_user_data(bo, tex, free_eglimage);
-
 	return tex->tex;
 }
 

backend/wayland/output.c

@@ -99,8 +99,6 @@ static bool wlr_wl_output_set_cursor(struct wlr_output *_output,
 		return true;
 	}
 
-	stride *= 4; // stride is given in pixels, we need it in bytes
-
 	if (!backend->shm || !backend->pointer) {
 		wlr_log(L_INFO, "cannot set cursor, no shm or pointer");
 		return false;