StandardMaterial doesn't work in webgl2 on Windows with DX12

[DGriffin91]

Bevy version e67d63a

The release number or commit hash of the version you're using.

The issue was introduced at 1f95a48 with #8006.

Relevant system information

• Windows 10, Nvidia RTX 3060

What you did

Try to run the 3d_scene example in webgl2.

What went wrong

Update: I get this error with any scene that uses the StandardMaterial, not just ones with shadows

Chrome:

Caused by:
    In Device::create_render_pipeline
      note: label = `pbr_opaque_mesh_pipeline`
    Internal error in ShaderStages(VERTEX | FRAGMENT) shader: C:\fakepath(5735,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6517,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (65 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with default flags. (ps_5_0)
 Retrying with skip validation
C:\fakepath(5735,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6517,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (65 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with skip validation flags. (ps_5_0)
 Retrying with skip optimization
C:\fakepath(5735,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6517,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (65 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with skip optimization flags. (ps_5_0)

Failed to create D3D Shaders

Firefox:

WebGL warning: linkProgram: Failed to link, leaving the following log:
C:\fakepath(5743,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6525,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (55 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with default flags. (ps_5_0)
 Retrying with skip validation
C:\fakepath(5743,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6525,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (55 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with skip validation flags. (ps_5_0)
 Retrying with skip optimization
C:\fakepath(5743,12-121): warning X3570: gradient instruction used in a loop with varying iteration, attempting to unroll the loop
C:\fakepath(6525,3-15): error X3511: unable to unroll loop, loop does not appear to terminate in a timely manner (55 iterations) or unrolled loop is too large, use the [unroll(n)] attribute to force an exact higher number

Warning: D3D shader compilation failed with skip optimization flags. (ps_5_0)

Failed to create D3D Shaders

[alice-i-cecile]

FYI @JMS55.

[superdump]

Hmm, I don't understand yet. All PCF paths lead to sample_shadow_map_hardware() and that uses textureSampleCompareLevel() in all cases, including WebGL2. textureSampleCompareLevel() does not use gradients, because it always samples mip level 0.

[superdump]

Affecting all scenes that use StandardMaterial, even if they don't have shadows, seems very strange to be related to the PCF PR. Are you certain of that?

[JMS55]

I imagine the shadow code gets included in the shader anyways.