Merge pull request #182 from ascent12/drm-multi-gpu

DRM Multi-GPU

1 files changed, 39 insertions, 0 deletions

diff --git a/include/backend/drm/util.h b/include/backend/drm/util.h
new file mode 100644
index 00000000..6818b4db
--- /dev/null
+++ b/include/backend/drm/util.h
@@ -0,0 +1,39 @@
+#ifndef BACKEND_DRM_UTIL_H
+#define BACKEND_DRM_UTIL_H
+
+#include <stdint.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <wlr/types/wlr_output.h>
+
+// Calculates a more accurate refresh rate (mHz) than what mode itself provides
+int32_t calculate_refresh_rate(drmModeModeInfo *mode);
+// Populates the make/model/phys_{width,height} of output from the edid data
+void parse_edid(struct wlr_output *restrict output, size_t len, const uint8_t *data);
+// Returns the string representation of a DRM output type
+const char *conn_get_name(uint32_t type_id);
+// Returns the DRM framebuffer id for a gbm_bo
+uint32_t get_fb_for_bo(struct gbm_bo *bo);
+
+// Part of match_obj
+enum {
+	UNMATCHED = (uint32_t)-1,
+	SKIP = (uint32_t)-2,
+};
+
+/*
+ * Tries to match some DRM objects with some other DRM resource.
+ * e.g. Match CRTCs with Encoders, CRTCs with Planes.
+ *
+ * objs contains a bit array which resources it can be matched with.
+ * e.g. Bit 0 set means can be matched with res[0]
+ *
+ * res contains an index of which objs it is matched with or UNMATCHED.
+ *
+ * This solution is left in out.
+ * Returns the total number of matched solutions.
+ */
+size_t match_obj(size_t num_objs, const uint32_t objs[static restrict num_objs],
+		size_t num_res, const uint32_t res[static restrict num_res],
+		uint32_t out[static restrict num_res]);
+#endif