From 51c7078b9ec413ebd8316501f01ccf769a090f64 Mon Sep 17 00:00:00 2001
From: Erik Reider <35975961+ErikReider@users.noreply.github.com>
Date: Sun, 31 Dec 2023 00:32:39 +0100
Subject: Converted fx_renderer to impl wlr_renderer

Makes the fx_renderer the default renderer for everything, no wlr_gles2 rendering.
This includes wlr_render_pass (fx_render_pass in our case)
---
 render/fx_renderer/util.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 render/fx_renderer/util.c

(limited to 'render/fx_renderer/util.c')

diff --git a/render/fx_renderer/util.c b/render/fx_renderer/util.c
new file mode 100644
index 0000000..c262aab
--- /dev/null
+++ b/render/fx_renderer/util.c
@@ -0,0 +1,113 @@
+#define _POSIX_C_SOURCE 200809L
+#include <fcntl.h>
+#include <unistd.h>
+#include <wlr/util/log.h>
+#include <wlr/types/wlr_buffer.h>
+#include <xf86drm.h>
+
+#include "render/fx_renderer/util.h"
+
+static uint32_t backend_get_buffer_caps(struct wlr_backend *backend) {
+	if (!backend->impl->get_buffer_caps) {
+		return 0;
+	}
+
+	return backend->impl->get_buffer_caps(backend);
+}
+
+static int open_drm_render_node(void) {
+	uint32_t flags = 0;
+	int devices_len = drmGetDevices2(flags, NULL, 0);
+	if (devices_len < 0) {
+		wlr_log(WLR_ERROR, "drmGetDevices2 failed: %s", strerror(-devices_len));
+		return -1;
+	}
+	drmDevice **devices = calloc(devices_len, sizeof(*devices));
+	if (devices == NULL) {
+		wlr_log_errno(WLR_ERROR, "Allocation failed");
+		return -1;
+	}
+	devices_len = drmGetDevices2(flags, devices, devices_len);
+	if (devices_len < 0) {
+		free(devices);
+		wlr_log(WLR_ERROR, "drmGetDevices2 failed: %s", strerror(-devices_len));
+		return -1;
+	}
+
+	int fd = -1;
+	for (int i = 0; i < devices_len; i++) {
+		drmDevice *dev = devices[i];
+		if (dev->available_nodes & (1 << DRM_NODE_RENDER)) {
+			const char *name = dev->nodes[DRM_NODE_RENDER];
+			wlr_log(WLR_DEBUG, "Opening DRM render node '%s'", name);
+			fd = open(name, O_RDWR | O_CLOEXEC);
+			if (fd < 0) {
+				wlr_log_errno(WLR_ERROR, "Failed to open '%s'", name);
+				goto out;
+			}
+			break;
+		}
+	}
+	if (fd < 0) {
+		wlr_log(WLR_ERROR, "Failed to find any DRM render node");
+	}
+
+out:
+	for (int i = 0; i < devices_len; i++) {
+		drmFreeDevice(&devices[i]);
+	}
+	free(devices);
+
+	return fd;
+}
+
+bool open_preferred_drm_fd(struct wlr_backend *backend, int *drm_fd_ptr,
+		bool *own_drm_fd) {
+	if (*drm_fd_ptr >= 0) {
+		return true;
+	}
+
+	// Allow the user to override the render node
+	const char *render_name = getenv("WLR_RENDER_DRM_DEVICE");
+	if (render_name != NULL) {
+		wlr_log(WLR_INFO,
+			"Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE",
+			render_name);
+		int drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
+		if (drm_fd < 0) {
+			wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name);
+			return false;
+		}
+		if (drmGetNodeTypeFromFd(drm_fd) != DRM_NODE_RENDER) {
+			wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name);
+			close(drm_fd);
+			return false;
+		}
+		*drm_fd_ptr = drm_fd;
+		*own_drm_fd = true;
+		return true;
+	}
+
+	// Prefer the backend's DRM node, if any
+	int backend_drm_fd = wlr_backend_get_drm_fd(backend);
+	if (backend_drm_fd >= 0) {
+		*drm_fd_ptr = backend_drm_fd;
+		*own_drm_fd = false;
+		return true;
+	}
+
+	// If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an
+	// arbitrary render node
+	uint32_t backend_caps = backend_get_buffer_caps(backend);
+	if (backend_caps & WLR_BUFFER_CAP_DMABUF) {
+		int drm_fd = open_drm_render_node();
+		if (drm_fd < 0) {
+			return false;
+		}
+		*drm_fd_ptr = drm_fd;
+		*own_drm_fd = true;
+		return true;
+	}
+
+	return false;
+}
-- 
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