test: add test for alpha prop

test/meson.build

@@ -55,6 +55,9 @@ tests = {
 	'priority': [
 		#'basic',
 	],
+	'prop': [
+		'alpha',
+	],
 }
 
 foreach test_name, subtests : tests

test/test_prop.c

@@ -0,0 +1,120 @@
+#include <assert.h>
+#include <unistd.h>
+#include <libliftoff.h>
+#include <stdio.h>
+#include <string.h>
+#include "libdrm_mock.h"
+
+static struct liftoff_layer *add_layer(struct liftoff_output *output,
+				       int x, int y, int width, int height)
+{
+	uint32_t fb_id;
+	struct liftoff_layer *layer;
+
+	layer = liftoff_layer_create(output);
+	fb_id = liftoff_mock_drm_create_fb(layer);
+	liftoff_layer_set_property(layer, "FB_ID", fb_id);
+	liftoff_layer_set_property(layer, "CRTC_X", x);
+	liftoff_layer_set_property(layer, "CRTC_Y", y);
+	liftoff_layer_set_property(layer, "CRTC_W", width);
+	liftoff_layer_set_property(layer, "CRTC_H", height);
+	liftoff_layer_set_property(layer, "SRC_X", 0);
+	liftoff_layer_set_property(layer, "SRC_Y", 0);
+	liftoff_layer_set_property(layer, "SRC_W", width << 16);
+	liftoff_layer_set_property(layer, "SRC_H", height << 16);
+
+	return layer;
+}
+
+int main(int argc, char *argv[]) {
+	const char *test_name;
+	struct liftoff_mock_plane *mock_plane_with_prop,
+				  *mock_plane_without_prop;
+	int drm_fd;
+	struct liftoff_device *device;
+	struct liftoff_output *output;
+	struct liftoff_layer *layer;
+	drmModeAtomicReq *req;
+	bool ok;
+
+	liftoff_log_init(LIFTOFF_DEBUG, NULL);
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s <test-name>\n", argv[0]);
+		return 1;
+	}
+	test_name = argv[1];
+
+	mock_plane_without_prop = liftoff_mock_drm_create_plane(DRM_PLANE_TYPE_OVERLAY);
+	mock_plane_with_prop = liftoff_mock_drm_create_plane(DRM_PLANE_TYPE_OVERLAY);
+
+	/* Value that requires the prop for the plane allocation to succeed */
+	uint64_t require_prop_value;
+	/* Value that doesn't require the prop to be present */
+	uint64_t default_value;
+	if (strcmp(test_name, "alpha") == 0) {
+		require_prop_value = (uint16_t)(0.5 * 0xFFFF);
+		default_value = 0xFFFF; /* opaque */
+	} else {
+		fprintf(stderr, "no such test: %s\n", test_name);
+		return 1;
+	}
+
+	/* We need to setup mock plane properties before creating the liftoff
+	 * device */
+	drmModePropertyRes prop = {0};
+	strncpy(prop.name, test_name, sizeof(prop.name) - 1);
+	liftoff_mock_plane_add_property(mock_plane_with_prop, &prop);
+
+	drm_fd = liftoff_mock_drm_open();
+	device = liftoff_device_create(drm_fd);
+	assert(device != NULL);
+
+	output = liftoff_output_create(device, liftoff_mock_drm_crtc_id);
+	layer = add_layer(output, 0, 0, 1920, 1080);
+
+	liftoff_mock_plane_add_compatible_layer(mock_plane_without_prop, layer);
+
+	/* First test that the layer doesn't get assigned to the plane without
+	 * the prop when using a non-default value */
+
+	req = drmModeAtomicAlloc();
+
+	liftoff_layer_set_property(layer, prop.name, require_prop_value);
+
+	ok = liftoff_output_apply(output, req);
+	assert(ok);
+	assert(liftoff_layer_get_plane_id(layer) == 0);
+	drmModeAtomicFree(req);
+
+	/* The layer should get assigned to the plane without the prop when
+	 * using the default value */
+
+	req = drmModeAtomicAlloc();
+
+	liftoff_layer_set_property(layer, prop.name, default_value);
+
+	ok = liftoff_output_apply(output, req);
+	assert(ok);
+	assert(liftoff_layer_get_plane_id(layer) != 0);
+	drmModeAtomicFree(req);
+
+	/* The layer should get assigned to the plane with the prop when using
+	 * a non-default value */
+
+	liftoff_mock_plane_add_compatible_layer(mock_plane_with_prop, layer);
+
+	req = drmModeAtomicAlloc();
+
+	liftoff_layer_set_property(layer, prop.name, require_prop_value);
+
+	ok = liftoff_output_apply(output, req);
+	assert(ok);
+	assert(liftoff_layer_get_plane_id(layer) != 0);
+	drmModeAtomicFree(req);
+
+	liftoff_device_destroy(device);
+	close(drm_fd);
+
+	return 0;
+}