sokol_gfx.h: tweak sg_dispatch validation

sokol_gfx.h

@@ -4030,9 +4030,9 @@ typedef struct sg_frame_stats {
     _SG_LOGITEM_XMACRO(VALIDATE_DRAW_NUMINSTANCES, "sg_draw: num_instances cannot be < 0") \
     _SG_LOGITEM_XMACRO(VALIDATE_DRAW_REQUIRED_BINDINGS_OR_UNIFORMS_MISSING, "sg_draw: call to sg_apply_bindings() and/or sg_apply_uniforms() missing after sg_apply_pipeline()") \
     _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_COMPUTEPASS_EXPECTED, "sg_dispatch: must be called in a compute pass") \
-    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSX, "sg_dispatch: num_groups_x cannot be < 0") \
-    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSY, "sg_dispatch: num_groups_y cannot be < 0") \
-    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSZ, "sg_dispatch: num_groups_z cannot be < 0") \
+    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSX, "sg_dispatch: num_groups_x must be >=0 and <65536") \
+    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSY, "sg_dispatch: num_groups_y must be >=0 and <65536") \
+    _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_NUMGROUPSZ, "sg_dispatch: num_groups_z must be >=0 and <65536") \
     _SG_LOGITEM_XMACRO(VALIDATE_DISPATCH_REQUIRED_BINDINGS_OR_UNIFORMS_MISSING, "sg_dispatch: call to sg_apply_bindings() and/or sg_apply_uniforms() missing after sg_apply_pipeline()") \
     _SG_LOGITEM_XMACRO(VALIDATE_UPDATEBUF_USAGE, "sg_update_buffer: cannot update immutable buffer") \
     _SG_LOGITEM_XMACRO(VALIDATE_UPDATEBUF_SIZE, "sg_update_buffer: update size is bigger than buffer size") \
@@ -18471,9 +18471,9 @@ _SOKOL_PRIVATE bool _sg_validate_dispatch(int num_groups_x, int num_groups_y, in
         }
         _sg_validate_begin();
         _SG_VALIDATE(_sg.cur_pass.in_pass && _sg.cur_pass.is_compute, VALIDATE_DISPATCH_COMPUTEPASS_EXPECTED);
-        _SG_VALIDATE(num_groups_x >= 0, VALIDATE_DISPATCH_NUMGROUPSX);
-        _SG_VALIDATE(num_groups_y >= 0, VALIDATE_DISPATCH_NUMGROUPSY);
-        _SG_VALIDATE(num_groups_z >= 0, VALIDATE_DISPATCH_NUMGROUPSZ);
+        _SG_VALIDATE((num_groups_x >= 0) && (num_groups_x < (1<<16)), VALIDATE_DISPATCH_NUMGROUPSX);
+        _SG_VALIDATE((num_groups_y >= 0) && (num_groups_y < (1<<16)), VALIDATE_DISPATCH_NUMGROUPSY);
+        _SG_VALIDATE((num_groups_z >= 0) && (num_groups_z < (1<<16)), VALIDATE_DISPATCH_NUMGROUPSZ);
         _SG_VALIDATE(_sg.required_bindings_and_uniforms == _sg.applied_bindings_and_uniforms, VALIDATE_DRAW_REQUIRED_BINDINGS_OR_UNIFORMS_MISSING);
         return _sg_validate_end();
     #endif