Regression: Blender 3.5.0 crashes when going to Edit Mode with a Curve selected #106432

System Information
Operating system: Linux-5.19.0-38-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: Mesa Intel(R) HD Graphics 3000 (SNB GT2) Intel 3.3 (Core Profile) Mesa 22.2.5

Blender Version
Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: 1be25cfff18b
Worked: (newest version of Blender that worked as expected)

Short description of error
Hello ! I use Ubuntu 22.04.2 LTS and Blender 3.5.0. I run xmonad through startx. Previously I used Blender 3.4, and all fine. With 3.5.0, each time I enter Edit Mode to edit a curve (every kind of curve), Blender chrashes.

Exact steps for others to reproduce the error
I open blender. I add object curve, every kind, as for example nurbs, path..
I enter Edit Mode with the curve selected.
Blender chrashes, and on the terminal I read:

ERROR (gpu.shader): overlay_edit_curve_handle GeomShader: 
      | 
 1334 |   if (!showCurveHandles && (color_id < 5)) {
      |                             ^
      | overlay_edit_curve_handle_geom.glsl:29:29: Error: could not implicitly convert operands to relational operator
      | overlay_edit_curve_handle_geom.glsl:29:29: Error: RHS of `&&' must be scalar boolean
      | 
 1345 |   if ((curveHandleDisplay != CURVE_HANDLE_ALL) && (!handle_selected)) {
      |        ^
      | overlay_edit_curve_handle_geom.glsl:40:8: Error: operands of `!=' must have the same type
      | 
 1348 |     if ((!is_u_segment) && (color_id <= 4)) {
      |                           ^
      | overlay_edit_curve_handle_geom.glsl:43:27: Error: could not implicitly convert operands to relational operator
      | overlay_edit_curve_handle_geom.glsl:43:27: Error: RHS of `&&' must be scalar boolean
      | 
 1357 |   if (color_id == 0) {
      |       ^
      | overlay_edit_curve_handle_geom.glsl:52:7: Error: operands of `==' must have the same type
      | 
 1360 |   else if (color_id == 1) {
      |            ^
      | overlay_edit_curve_handle_geom.glsl:55:12: Error: operands of `==' must have the same type
      | 
 1363 |   else if (color_id == 2) {
      |            ^
      | overlay_edit_curve_handle_geom.glsl:58:12: Error: operands of `==' must have the same type
      | 
 1366 |   else if (color_id == 3) {
      |            ^
      | overlay_edit_curve_handle_geom.glsl:61:12: Error: operands of `==' must have the same type
      | 
 1369 |   else if (color_id == 4) {
      |            ^
      | overlay_edit_curve_handle_geom.glsl:64:12: Error: operands of `==' must have the same type
      | 
 1373 |     bool is_selected = (((vert[1].flag & vert[0].flag) & VERT_SELECTED) != 0);
      |                       ^
      | overlay_edit_curve_handle_geom.glsl:68:23: Error: operands of `!=' must have the same type
      | 
 1374 |     bool is_u_segment = (((vert[1].flag ^ vert[0].flag) & EVEN_U_BIT) != 0);
      |                        ^
      | overlay_edit_curve_handle_geom.glsl:69:24: Error: operands of `!=' must have the same type
      | 
 1383 |   vec4 outer_color = (is_active_nurb != 0) ?
      |                       ^
      | overlay_edit_curve_handle_geom.glsl:78:23: Error: operands of `!=' must have the same type

Writing: /tmp/msg_mesh.crash.txt
user error (Error in function getWindowAttributes)
user error (Error in function getWindowAttributes)
user error (Error in function getWindowAttributes)
user error (Error in function getWindowAttributes)
Segmentation fault (core dumped)
Read prefs: /home/mirko/.config/blender/3.5/config/userpref.blend
user error (Error in function getWindowAttributes)

**System Information** Operating system: Linux-5.19.0-38-generic-x86_64-with-glibc2.35 64 Bits Graphics card: Mesa Intel(R) HD Graphics 3000 (SNB GT2) Intel 3.3 (Core Profile) Mesa 22.2.5 **Blender Version** Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: `1be25cfff18b` Worked: (newest version of Blender that worked as expected) **Short description of error** Hello ! I use Ubuntu 22.04.2 LTS and Blender 3.5.0. I run xmonad through startx. Previously I used Blender 3.4, and all fine. With 3.5.0, each time I enter Edit Mode to edit a curve (every kind of curve), Blender chrashes. **Exact steps for others to reproduce the error** I open blender. I add object curve, every kind, as for example nurbs, path.. I enter Edit Mode with the curve selected. Blender chrashes, and on the terminal I read: ``` ERROR (gpu.shader): overlay_edit_curve_handle GeomShader: | 1334 | if (!showCurveHandles && (color_id < 5)) { | ^ | overlay_edit_curve_handle_geom.glsl:29:29: Error: could not implicitly convert operands to relational operator | overlay_edit_curve_handle_geom.glsl:29:29: Error: RHS of `&&' must be scalar boolean | 1345 | if ((curveHandleDisplay != CURVE_HANDLE_ALL) && (!handle_selected)) { | ^ | overlay_edit_curve_handle_geom.glsl:40:8: Error: operands of `!=' must have the same type | 1348 | if ((!is_u_segment) && (color_id <= 4)) { | ^ | overlay_edit_curve_handle_geom.glsl:43:27: Error: could not implicitly convert operands to relational operator | overlay_edit_curve_handle_geom.glsl:43:27: Error: RHS of `&&' must be scalar boolean | 1357 | if (color_id == 0) { | ^ | overlay_edit_curve_handle_geom.glsl:52:7: Error: operands of `==' must have the same type | 1360 | else if (color_id == 1) { | ^ | overlay_edit_curve_handle_geom.glsl:55:12: Error: operands of `==' must have the same type | 1363 | else if (color_id == 2) { | ^ | overlay_edit_curve_handle_geom.glsl:58:12: Error: operands of `==' must have the same type | 1366 | else if (color_id == 3) { | ^ | overlay_edit_curve_handle_geom.glsl:61:12: Error: operands of `==' must have the same type | 1369 | else if (color_id == 4) { | ^ | overlay_edit_curve_handle_geom.glsl:64:12: Error: operands of `==' must have the same type | 1373 | bool is_selected = (((vert[1].flag & vert[0].flag) & VERT_SELECTED) != 0); | ^ | overlay_edit_curve_handle_geom.glsl:68:23: Error: operands of `!=' must have the same type | 1374 | bool is_u_segment = (((vert[1].flag ^ vert[0].flag) & EVEN_U_BIT) != 0); | ^ | overlay_edit_curve_handle_geom.glsl:69:24: Error: operands of `!=' must have the same type | 1383 | vec4 outer_color = (is_active_nurb != 0) ? | ^ | overlay_edit_curve_handle_geom.glsl:78:23: Error: operands of `!=' must have the same type Writing: /tmp/msg_mesh.crash.txt user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) Segmentation fault (core dumped) Read prefs: /home/mirko/.config/blender/3.5/config/userpref.blend user error (Error in function getWindowAttributes) ```

msg_mesh.blend

812 KiB

Can you run glxinfo | grep OpenGL and attach the output of it?

It seems that from your graphics report, your hardware/mesa layer only supports OpenGL 3.3 and starting from Blender 3.5 it requires at least OpenGL 4.3. This might explain why there are shader errors, this could result in invalid shaders and lead to crash.

Can you run `glxinfo | grep OpenGL` and attach the output of it? It seems that from your graphics report, your hardware/mesa layer only supports OpenGL 3.3 and starting from Blender 3.5 it requires at least OpenGL 4.3. This might explain why there are shader errors, this could result in invalid shaders and lead to crash.

The following is the output of 'sudo glxinfo | grep OpenGL'.
If the problem is related to OpenGL version, than I can update my OpenGL or use an oldest version of Blender.

mirko@mirko-HP-Pavilion-dv6-Notebook-PC:~$ sudo glxinfo | grep OpenGL
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) HD Graphics 3000 (SNB GT2)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 22.2.5
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.3 (Compatibility Profile) Mesa 22.2.5
OpenGL shading language version string: 3.30
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 22.2.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
mirko@mirko-HP-Pavilion-dv6-Notebook-PC:~$

The following is the output of 'sudo glxinfo | grep OpenGL'. If the problem is related to OpenGL version, than I can update my OpenGL or use an oldest version of Blender. mirko@mirko-HP-Pavilion-dv6-Notebook-PC:~$ sudo glxinfo | grep OpenGL OpenGL vendor string: Intel OpenGL renderer string: Mesa Intel(R) HD Graphics 3000 (SNB GT2) OpenGL core profile version string: 3.3 (Core Profile) Mesa 22.2.5 OpenGL core profile shading language version string: 3.30 OpenGL core profile context flags: (none) OpenGL core profile profile mask: core profile OpenGL core profile extensions: OpenGL version string: 3.3 (Compatibility Profile) Mesa 22.2.5 OpenGL shading language version string: 3.30 OpenGL context flags: (none) OpenGL profile mask: compatibility profile OpenGL extensions: OpenGL ES profile version string: OpenGL ES 3.0 Mesa 22.2.5 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00 OpenGL ES profile extensions: mirko@mirko-HP-Pavilion-dv6-Notebook-PC:~$

Yepp, seems like you are running it on an old graphics hardware that doesn't support OpenGL 4.3 (Your report shows only 3.3).

Poke @fclem ... I'm not sure if it's possible or worth the effort to have these more "basic" shaders compile on older hardware like this one, I'm guessing likely not because it would involve the how the back-end is set up...

Yepp, seems like you are running it on an old graphics hardware that doesn't support OpenGL 4.3 (Your report shows only 3.3). Poke @fclem ... I'm not sure if it's possible or worth the effort to have these more "basic" shaders compile on older hardware like this one, I'm guessing likely not because it would involve the how the back-end is set up...

@ChengduLittleA This error Error: operands of ==' must have the same type` is just an implementation dependent behavior. It isn't clearly stated in the standard. It is clearly stated in the GLSL codestyle that implicit integer type conversion is not to be relied upon. So it is a valid bug with simple fix.

Note that we still only require Opengl 3.3 until Blender 4.0.

@ChengduLittleA This error `Error: operands of `==' must have the same type` is just an implementation dependent behavior. It isn't clearly stated in the standard. It is clearly stated in the [GLSL codestyle](https://wiki.blender.org/wiki/Style_Guide/GLSL#Driver_Differences) that implicit integer type conversion is not to be relied upon. So it is a valid bug with simple fix. Note that we still only require Opengl 3.3 until Blender 4.0.

@fclem : when confirming, please make sure we also have the appropriate Module label set.

Although this is a crash and @fclem mentions that this needs to be fixed it seems to only occur on platforms that we don't support. For this I am lowering the priority.

Although all compares should be done by casting to the same type it can make the code look very weird:

Current GLSL

if (!showCurveHandles && (color_id < 5)) {

Incorrect conversion is between color_id/uint and 5/int. But the error message complains about bool && ... to be of incorrect type. Possible the fix would be:

if (!showCurveHandles && (color_id < 5u)) {

But we are not able to validate that this fixes the issue on those legacy drivers as we don't have access to them.

For now lowering the prio.

Although this is a crash and @fclem mentions that this needs to be fixed it seems to only occur on platforms that we don't support. For this I am lowering the priority. Although all compares should be done by casting to the same type it can make the code look very weird: Current GLSL ``` if (!showCurveHandles && (color_id < 5)) { ``` Incorrect conversion is between `color_id/uint` and `5/int`. But the error message complains about `bool && ...` to be of incorrect type. Possible the fix would be: ``` if (!showCurveHandles && (color_id < 5u)) { ``` But we are not able to validate that this fixes the issue on those legacy drivers as we don't have access to them. For now lowering the prio.

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Labels Milestones

Regression: Blender 3.5.0 crashes when going to Edit Mode with a Curve selected #106432