Fix T83625: Shading attribute names cause compilation error.

Some GPU platforms don't support having more than one underscore in
sequence in an attribute name. This change will remove the underscore
as a possible character when encoding to save names.

1 files changed, 3 insertions, 4 deletions

diff --git a/source/blender/gpu/intern/gpu_vertex_format.cc b/source/blender/gpu/intern/gpu_vertex_format.cc
index cd6d78a185d..014c70033fc 100644
--- a/source/blender/gpu/intern/gpu_vertex_format.cc
+++ b/source/blender/gpu/intern/gpu_vertex_format.cc
@@ -262,13 +262,12 @@ void GPU_vertformat_attr_rename(GPUVertFormat *format, int attr_id, const char *
 /* Encode 8 original bytes into 11 safe bytes. */
 static void safe_bytes(char out[11], const char data[8])
 {
-  char safe_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
+  char safe_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 
   uint64_t in = *(uint64_t *)data;
   for (int i = 0; i < 11; i++) {
-    /* Encoding in base63 */
-    out[i] = safe_chars[in % 63lu];
-    in /= 63lu;
+    out[i] = safe_chars[in % 62lu];
+    in /= 62lu;
   }
 }