Tests: add CMake option to run Cycles regression tests on GPU devices

CYCLES_TEST_DEVICES is a list of devices (CPU, CUDA, OPTIX, OPENCL). It is set
to CPU only by default.

Test output is now writen to build/tests/cycles/<device>, and the HTML report
has separate report pages for the different devices, with option to compare
between CPU and GPU renders.

Various GPU tests are still failing due to CPU/GPU differences, these are to be
fixed or blacklisted still.

Ref T82193

6 files changed, 69 insertions, 29 deletions

diff --git a/tests/python/CMakeLists.txt b/tests/python/CMakeLists.txt
index 22426a6d6fc..52dafa83c7a 100644
--- a/tests/python/CMakeLists.txt
+++ b/tests/python/CMakeLists.txt
@@ -598,20 +598,28 @@ if(WITH_CYCLES OR WITH_OPENGL_RENDER_TESTS)
       list(APPEND render_tests grease_pencil)
     endif()
 
+    # Cycles
     if(WITH_CYCLES)
-      foreach(render_test bake;${render_tests})
-        add_python_test(
-          cycles_${render_test}
-          ${CMAKE_CURRENT_LIST_DIR}/cycles_render_tests.py
-          -blender "${TEST_BLENDER_EXE}"
-          -testdir "${TEST_SRC_DIR}/render/${render_test}"
-          -idiff "${OPENIMAGEIO_IDIFF}"
-          -outdir "${TEST_OUT_DIR}/cycles"
-        )
+      foreach(_cycles_device ${CYCLES_TEST_DEVICES})
+        string(TOLOWER "${_cycles_device}" _cycles_device_lower)
+        set(_cycles_render_tests bake;${render_tests})
+
+        foreach(render_test ${_cycles_render_tests})
+          add_python_test(
+            cycles_${render_test}_${_cycles_device_lower}
+            ${CMAKE_CURRENT_LIST_DIR}/cycles_render_tests.py
+            -blender "${TEST_BLENDER_EXE}"
+            -testdir "${TEST_SRC_DIR}/render/${render_test}"
+            -idiff "${OPENIMAGEIO_IDIFF}"
+            -outdir "${TEST_OUT_DIR}/cycles"
+            -device ${_cycles_device}
+          )
+        endforeach()
       endforeach()
     endif()
 
     if(WITH_OPENGL_RENDER_TESTS)
+      # Eevee
       foreach(render_test ${render_tests})
         add_python_test(
           eevee_${render_test}_test
@@ -624,6 +632,7 @@ if(WITH_CYCLES OR WITH_OPENGL_RENDER_TESTS)
       endforeach()
 
       foreach(render_test ${render_tests})
+        # Workbench
         add_python_test(
           workbench_${render_test}_test
           ${CMAKE_CURRENT_LIST_DIR}/workbench_render_tests.py
diff --git a/tests/python/cycles_render_tests.py b/tests/python/cycles_render_tests.py
index 3c597b39cb8..9153a2732b5 100644
--- a/tests/python/cycles_render_tests.py
+++ b/tests/python/cycles_render_tests.py
@@ -50,6 +50,7 @@ def create_argparse():
     parser.add_argument("-testdir", nargs=1)
     parser.add_argument("-outdir", nargs=1)
     parser.add_argument("-idiff", nargs=1)
+    parser.add_argument("-device", nargs=1)
     return parser
 
 
@@ -61,12 +62,16 @@ def main():
     test_dir = args.testdir[0]
     idiff = args.idiff[0]
     output_dir = args.outdir[0]
+    device = args.device[0]
 
     from modules import render_report
-    report = render_report.Report("Cycles", output_dir, idiff)
+    report = render_report.Report('Cycles', output_dir, idiff, device)
     report.set_pixelated(True)
     report.set_reference_dir("cycles_renders")
-    report.set_compare_engines('cycles', 'eevee')
+    if device == 'CPU':
+        report.set_compare_engine('eevee')
+    else:
+        report.set_compare_engine('cycles', 'CPU')
 
     # Increase threshold for motion blur, see T78777.
     test_dir_name = Path(test_dir).name
diff --git a/tests/python/eevee_render_tests.py b/tests/python/eevee_render_tests.py
index 4c3ca28402f..4f1eba3348f 100644
--- a/tests/python/eevee_render_tests.py
+++ b/tests/python/eevee_render_tests.py
@@ -137,7 +137,7 @@ def main():
     report = render_report.Report("Eevee", output_dir, idiff)
     report.set_pixelated(True)
     report.set_reference_dir("eevee_renders")
-    report.set_compare_engines('eevee', 'cycles')
+    report.set_compare_engines('cycles', 'CPU')
     ok = report.run(test_dir, blender, get_arguments, batch=True)
 
     sys.exit(not ok)
diff --git a/tests/python/modules/global_report.py b/tests/python/modules/global_report.py
index f7f181c4736..636ec61d471 100755
--- a/tests/python/modules/global_report.py
+++ b/tests/python/modules/global_report.py
@@ -39,6 +39,7 @@ def _write_html(output_dir):
     <div class="container">
         <br/>
         <h1>{title}</h1>
+        <nav aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item active" aria-current="page">Test Reports</li></ol></nav>
         {combined_reports}
         <br/>
     </div>
diff --git a/tests/python/modules/render_report.py b/tests/python/modules/render_report.py
index 832d3849f01..24d0164adf1 100755
--- a/tests/python/modules/render_report.py
+++ b/tests/python/modules/render_report.py
@@ -102,6 +102,7 @@ class Report:
     __slots__ = (
         'title',
         'output_dir',
+        'global_dir',
         'reference_dir',
         'idiff',
         'pixelated',
@@ -112,17 +113,24 @@ class Report:
         'failed_tests',
         'passed_tests',
         'compare_tests',
-        'compare_engines'
+        'compare_engine',
+        'device'
     )
 
-    def __init__(self, title, output_dir, idiff):
+    def __init__(self, title, output_dir, idiff, device=None):
         self.title = title
         self.output_dir = output_dir
+        self.global_dir = os.path.dirname(output_dir)
         self.reference_dir = 'reference_renders'
         self.idiff = idiff
-        self.compare_engines = None
+        self.compare_engine = None
         self.fail_threshold = 0.016
         self.fail_percent = 1
+        self.device = device
+
+        if device:
+            self.title = self._engine_title(title, device)
+            self.output_dir = self._engine_path(self.output_dir, device.lower())
 
         self.pixelated = False
         self.verbose = os.environ.get("BLENDER_VERBOSE") is not None
@@ -147,8 +155,8 @@ class Report:
     def set_reference_dir(self, reference_dir):
         self.reference_dir = reference_dir
 
-    def set_compare_engines(self, engine, other_engine):
-        self.compare_engines = (engine, other_engine)
+    def set_compare_engine(self, other_engine, other_device=None):
+        self.compare_engine = (other_engine, other_device)
 
     def run(self, dirpath, blender, arguments_cb, batch=False):
         # Run tests and output report.
@@ -156,7 +164,7 @@ class Report:
         ok = self._run_all_tests(dirname, dirpath, blender, arguments_cb, batch)
         self._write_data(dirname)
         self._write_html()
-        if self.compare_engines:
+        if self.compare_engine:
             self._write_html(comparison=True)
         return ok
 
@@ -171,7 +179,7 @@ class Report:
         filepath = os.path.join(outdir, "passed.data")
         pathlib.Path(filepath).write_text(self.passed_tests)
 
-        if self.compare_engines:
+        if self.compare_engine:
             filepath = os.path.join(outdir, "compare.data")
             pathlib.Path(filepath).write_text(self.compare_tests)
 
@@ -181,12 +189,26 @@ class Report:
         else:
             return """<li class="breadcrumb-item"><a href="%s">%s</a></li>""" % (href, title)
 
+    def _engine_title(self, engine, device):
+        if device:
+            return engine.title() + ' ' + device
+        else:
+            return engine.title()
+
+    def _engine_path(self, path, device):
+        if device:
+            return os.path.join(path, device.lower())
+        else:
+            return path
+
     def _navigation_html(self, comparison):
         html = """<nav aria-label="breadcrumb"><ol class="breadcrumb">"""
-        html += self._navigation_item("Test Reports", "../report.html", False)
+        base_path = os.path.relpath(self.global_dir, self.output_dir)
+        global_report_path = os.path.join(base_path, "report.html")
+        html += self._navigation_item("Test Reports", global_report_path, False)
         html += self._navigation_item(self.title, "report.html", not comparison)
-        if self.compare_engines:
-            compare_title = "Compare with %s" % self.compare_engines[1].capitalize()
+        if self.compare_engine:
+            compare_title = "Compare with %s" % self._engine_title(*self.compare_engine)
             html += self._navigation_item(compare_title, "compare.html", comparison)
         html += """</ol></nav>"""
 
@@ -233,8 +255,8 @@ class Report:
 
         if comparison:
             title = self.title + " Test Compare"
-            engine_self = self.compare_engines[0].capitalize()
-            engine_other = self.compare_engines[1].capitalize()
+            engine_self = self.title
+            engine_other = self._engine_title(*self.compare_engine)
             columns_html = "<tr><th>Name</th><th>%s</th><th>%s</th>" % (engine_self, engine_other)
         else:
             title = self.title + " Test Report"
@@ -300,9 +322,8 @@ class Report:
 
         # Update global report
         if not comparison:
-            global_output_dir = os.path.dirname(self.output_dir)
             global_failed = failed if not comparison else None
-            global_report.add(global_output_dir, "Render", self.title, filepath, global_failed)
+            global_report.add(self.global_dir, "Render", self.title, filepath, global_failed)
 
     def _relative_url(self, filepath):
         relpath = os.path.relpath(filepath, self.output_dir)
@@ -340,8 +361,9 @@ class Report:
         else:
             self.passed_tests += test_html
 
-        if self.compare_engines:
-            ref_url = os.path.join("..", self.compare_engines[1], new_url)
+        if self.compare_engine:
+            base_path = os.path.relpath(self.global_dir, self.output_dir)
+            ref_url = os.path.join(base_path, self._engine_path(*self.compare_engine), new_url)
 
             test_html = """
                 <tr{tr_style}>
@@ -445,6 +467,9 @@ class Report:
                 if not batch:
                     break
 
+            if self.device:
+                command.extend(['--', '--cycles-device', self.device])
+
             # Run process
             crash = False
             output = None
diff --git a/tests/python/workbench_render_tests.py b/tests/python/workbench_render_tests.py
index 7c9842d5733..03a85c58dd9 100644
--- a/tests/python/workbench_render_tests.py
+++ b/tests/python/workbench_render_tests.py
@@ -72,7 +72,7 @@ def main():
     report = render_report.Report("Workbench", output_dir, idiff)
     report.set_pixelated(True)
     report.set_reference_dir("workbench_renders")
-    report.set_compare_engines('workbench', 'eevee')
+    report.set_compare_engine('eevee')
     ok = report.run(test_dir, blender, get_arguments, batch=True)
 
     sys.exit(not ok)