feat(linux): Add Vulkan video encoder (#4603)

cmake/scripts/binary_to_c.cmake

@@ -0,0 +1,35 @@
+# binary_to_c.cmake - Convert a binary file to a C uint32_t initializer list.
+# Input:  SPV_FILE  - path to SPIR-V binary
+# Output: OUT_FILE  - path to write C initializer (e.g. {0x07230203, ...})
+
+file(READ "${SPV_FILE}" data HEX)
+string(LENGTH "${data}" hex_len)
+math(EXPR num_bytes "${hex_len} / 2")
+math(EXPR num_words "${num_bytes} / 4")
+math(EXPR last "${num_words} - 1")
+
+set(_out "{")
+set(_idx 0)
+while(_idx LESS_EQUAL last)
+    math(EXPR off "${_idx} * 8")
+    math(EXPR off1 "${off} + 2")
+    math(EXPR off2 "${off} + 4")
+    math(EXPR off3 "${off} + 6")
+    string(SUBSTRING "${data}" ${off} 2 b0)
+    string(SUBSTRING "${data}" ${off1} 2 b1)
+    string(SUBSTRING "${data}" ${off2} 2 b2)
+    string(SUBSTRING "${data}" ${off3} 2 b3)
+    # little-endian to uint32_t
+    string(APPEND _out "0x${b3}${b2}${b1}${b0}")
+    if(NOT _idx EQUAL last)
+        string(APPEND _out ",")
+    endif()
+    math(EXPR _col "(${_idx} + 1) % 8")
+    if(_col EQUAL 0)
+        string(APPEND _out "\n")
+    endif()
+    math(EXPR _idx "${_idx} + 1")
+endwhile()
+string(APPEND _out "}\n")
+
+file(WRITE "${OUT_FILE}" "${_out}")