backend/native: Add tests for refresh rate calculation

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1737>
2021-02-26 20:16:23 +09:00
parent a41c30338f
commit a6df6796dd
5 changed files with 175 additions and 0 deletions
--- a/src/tests/kms-utils-unit-tests.c
+++ b/src/tests/kms-utils-unit-tests.c
@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2021 Akihiko Odaki <akihiko.odaki@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "config.h"
+
+#include "tests/kms-utils-unit-tests.h"
+
+#include "tests/test-utils.h"
+#include "backends/native/meta-kms-utils.h"
+
+typedef struct {
+  drmModeModeInfo drm_mode;
+  float expected_refresh_rate;
+} ModeInfoTestCase;
+
+static const ModeInfoTestCase test_cases[] = {
+  /* "cvt 640 480" */
+  {
+    .drm_mode = {
+      .clock = 23975,
+      .hdisplay = 640,
+      .hsync_start = 664,
+      .hsync_end = 720,
+      .htotal = 800,
+      .vdisplay = 480,
+      .vsync_start = 483,
+      .vsync_end = 487,
+      .vtotal = 500,
+      .vscan = 0,
+      .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+    },
+    .expected_refresh_rate = 59.9375,
+  },
+
+  /* "cvt 640 480" with htotal 0 */
+  {
+    .drm_mode = {
+       .clock = 23975,
+       .hdisplay = 640,
+       .hsync_start = 664,
+       .hsync_end = 720,
+       .htotal = 0,
+       .vdisplay = 480,
+       .vsync_start = 483,
+       .vsync_end = 487,
+       .vtotal = 500,
+       .vscan = 0,
+       .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+    },
+    .expected_refresh_rate = 0.0,
+  },
+
+  /* "cvt 640 480" with vtotal 0 */
+  {
+    .drm_mode = {
+      .clock = 23975,
+      .hdisplay = 640,
+      .hsync_start = 664,
+      .hsync_end = 720,
+      .htotal = 800,
+      .vdisplay = 480,
+      .vsync_start = 483,
+      .vsync_end = 487,
+      .vtotal = 0,
+      .vscan = 0,
+      .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+    },
+    .expected_refresh_rate = 0.0,
+  },
+
+  /* "cvt 320 240" with doubled clock and vscan 2 */
+  {
+    .drm_mode = {
+      .clock = 12062,
+      .hdisplay = 320,
+      .hsync_start = 336,
+      .hsync_end = 360,
+      .htotal = 400,
+      .vdisplay = 240,
+      .vsync_start = 243,
+      .vsync_end = 247,
+      .vtotal = 252,
+      .vscan = 2,
+      .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+    },
+    .expected_refresh_rate = 59.8313,
+  },
+
+  /* "cvt 15360 8640 180" */
+  {
+    .drm_mode = {
+      .clock = 37793603,
+      .hdisplay = 15360,
+      .hsync_start = 16880,
+      .hsync_end = 18624,
+      .htotal = 21888,
+      .vdisplay = 8640,
+      .vsync_start = 8643,
+      .vsync_end = 8648,
+      .vtotal = 9593,
+      .vscan = 0,
+      .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+    },
+    .expected_refresh_rate = 179.9939,
+  },
+};
+
+static void
+refresh_rate (void)
+{
+  size_t index;
+
+  for (index = 0; index < G_N_ELEMENTS(test_cases); index++)
+    {
+      const ModeInfoTestCase *test_case = test_cases + index;
+      float refresh_rate;
+
+      refresh_rate =
+        meta_calculate_drm_mode_refresh_rate (&test_case->drm_mode);
+      g_assert_cmpfloat_with_epsilon (refresh_rate,
+                                      test_case->expected_refresh_rate,
+                                      0.0001);
+    }
+}
+
+void
+init_kms_utils_tests (void)
+{
+  g_test_add_func ("/kms-utils/refresh-rate", refresh_rate);
+}