gpu: normalize 8-bit integer data in 0..1 by default.

src/gpu/vertexbuffer.cpp

@@ -294,8 +294,13 @@ void VertexDeclaration::SetStream(VertexBuffer *vb, ShaderAttrib attr1,
         if (type_index < 0 || type_index >= sizeof(tlut) / sizeof(*tlut))
             type_index = 0;
 
+        /* Normalize unsigned bytes by default, because it's usually
+         * some color information. */
+        GLboolean normalize = (tlut[type_index].type == GL_UNSIGNED_BYTE)
+                           || (tlut[type_index].type == GL_BYTE);
+
         glVertexAttribPointer((GLint)reg, tlut[type_index].size,
-                              tlut[type_index].type, GL_FALSE,
+                              tlut[type_index].type, normalize,
                               stride, (GLvoid const *)(uintptr_t)offset);
     }
 #endif