Fix #162523: GPU: Add mipmap workaround for Intel Arc Windows OpenGL

The compute-shader based function `update_mipmaps` can generate broken
mipmaps for Intel Arc Windows OpenGL. A workaround for falling back to
`generate_mipmap` is added to mitigate the issue. Furthermore, a render
test is added that catches the issue.

Pull Request: https://projects.blender.org/blender/blender/pulls/162524

tests/python/CMakeLists.txt

@@ -915,6 +915,7 @@ if((WITH_CYCLES OR WITH_GPU_RENDER_TESTS) AND TEST_SRC_DIR_EXISTS)
     image_colorspace
     image_data_types
     image_mapping
+    image_mipmap
     image_texture_limit
     integrator
     light
@@ -998,7 +999,7 @@ if((WITH_CYCLES OR WITH_GPU_RENDER_TESTS) AND TEST_SRC_DIR_EXISTS)
             "Supported devices are: ${_cycles_all_test_devices}")
       endif()
       string(TOLOWER "${_cycles_device}" _cycles_device_lower)
-      set(_cycles_render_tests bake;bake_raytrace;${render_tests};osl;image_mipmap;updates)
+      set(_cycles_render_tests bake;bake_raytrace;${render_tests};osl;updates)
 
       set(_cycles_osl_test_type none)
       if(WITH_CYCLES_OSL)

tests/python/eevee_render_tests.py

@@ -67,6 +67,17 @@ BLOCKLIST = [
     "light_path_is_camera_ray.blend",
     # Exhibit non-deterministic (to be fixed).
     "background_scene.blend",
+    # Currently, the only image_mipmap test enabled for EEVEE is image_mipmap_large_tex.blend.
+    "image_cache_evict.blend",
+    "image_mipmap_area_light.blend",
+    "image_mipmap_filter_glossy.blend",
+    "image_mipmap_incomplete_derivs.blend",
+    "image_mipmap_light_tree.blend",
+    "image_mipmap_transparent_shadow.blend",
+    "image_mipmap_volume.blend",
+    "image_mipmap_working_space.blend",
+    "image_mipmap_world.blend",
+    "image_mipmap_world_sun.blend",
 
     ### Cycles only tests go here ###
 ]
@@ -384,6 +395,10 @@ def main():
         elif test_dir_name in {"texture"}:
             report.set_fail_percent(0.14)
             report.set_fail_threshold(6.0 / 255.0)
+        elif test_dir_name.startswith('image_mipmap'):
+            # Reference images on the CI worker seem to differ slightly from images on
+            # an NVIDIA RTX 4060 Ti with driver 610.74
+            report.set_fail_threshold(6.0 / 255.0)
     elif test_dir_name.startswith('camera'):
         # camera_stereo_panoramic have some platform specific small differences
         report.set_fail_percent(0.14)
@@ -474,6 +489,13 @@ def main():
         # Some shadow difference, to be investigated
         report.set_fail_percent(0.09)
         report.set_fail_threshold(6.0 / 255.0)
+    elif test_dir_name.startswith('image_mipmap'):
+        # Texture interpolation can look slightly different.
+        if gpu_vendor == "AMD":
+            report.set_fail_percent(0.39)
+        else:
+            report.set_fail_percent(0.08)
+        report.set_fail_threshold(8.0 / 255.0)
 
     ok = report.run(args.testdir, args.blender, get_arguments, batch=args.batch)
     sys.exit(not ok)

tests/python/storm_render_tests.py

@@ -24,6 +24,12 @@ except ImportError:
     # this script is run during preparation steps.
     pass
 
+BLOCKLIST = [
+    # Currently, image_mipmap tests are not enabled for storm-usd
+    "image_cache_evict.blend",
+    "image_mipmap_.*.blend",
+]
+
 # Unsupported or broken scenarios for the Storm render engine
 BLOCKLIST_HYDRA = [
     # Corrupted output around borders
@@ -235,7 +241,7 @@ def main():
     parser = create_argparse()
     args = parser.parse_args()
 
-    blocklist = []
+    blocklist = BLOCKLIST
     if args.gpu_backend == "metal":
         blocklist += BLOCKLIST_METAL
     elif args.gpu_backend == "vulkan":