dusk/test/rpg/overworld/test_tileshape.c

/**
 * Copyright (c) 2026 Dominic Masters
 *
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "dusktest.h"
#include "util/memory.h"
#include "rpg/overworld/tileshape.h"

static void test_tileShapeGetRampHeightGroundIsAlwaysFlat(void **state) {
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_GROUND, 0.0f, 0.0f), 0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_GROUND, 1.0f, 1.0f), 0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_GROUND, 0.5f, 0.5f), 0.0f, 0.0001f
  );

  assert_int_equal(memoryGetAllocatedCount(), 0);
}

static void test_tileShapeGetRampHeightCardinalRamps(void **state) {
  // RAMP_NORTH: rises going north (+y) - height equals localY.
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTH, 0.5f, 0.0f), 0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTH, 0.5f, 1.0f), 1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTH, 0.0f, 0.5f), 0.5f, 0.0001f
  );

  // RAMP_SOUTH: rises going south (-y) - height equals 1 - localY.
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_SOUTH, 0.5f, 0.0f), 1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_SOUTH, 0.5f, 1.0f), 0.0f, 0.0001f
  );

  // RAMP_EAST: rises going east (+x) - height equals localX.
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_EAST, 0.0f, 0.5f), 0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_EAST, 1.0f, 0.5f), 1.0f, 0.0001f
  );

  // RAMP_WEST: rises going west (-x) - height equals 1 - localX.
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_WEST, 0.0f, 0.5f), 1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_WEST, 1.0f, 0.5f), 0.0f, 0.0001f
  );

  assert_int_equal(memoryGetAllocatedCount(), 0);
}

static void test_tileShapeGetRampHeightOuterCornerRamps(void **state) {
  // RAMP_NORTHEAST: only the NE corner raised - a hip shape, height
  // equal to min(localX, localY) since the mesh is split along the
  // SW-NE diagonal into two flat triangles.
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST, 0.0f, 0.0f),
    0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST, 1.0f, 1.0f),
    1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST, 0.3f, 0.7f),
    0.3f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST, 0.7f, 0.3f),
    0.3f, 0.0001f
  );

  // RAMP_SOUTHWEST: only the SW corner raised - height equal to
  // min(1 - localX, 1 - localY).
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_SOUTHWEST, 0.0f, 0.0f),
    1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_SOUTHWEST, 1.0f, 1.0f),
    0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_SOUTHWEST, 1.0f, 0.0f),
    0.0f, 0.0001f
  );

  assert_int_equal(memoryGetAllocatedCount(), 0);
}

static void test_tileShapeGetRampHeightInnerCornerRamp(void **state) {
  // RAMP_NORTHEAST_INNER: only the opposite (SW) corner lowered, rest of
  // the tile raised - height equal to max(localX, localY).
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST_INNER, 0.0f, 0.0f),
    0.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST_INNER, 1.0f, 1.0f),
    1.0f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST_INNER, 0.3f, 0.7f),
    0.7f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST_INNER, 0.7f, 0.3f),
    0.7f, 0.0001f
  );
  assert_float_equal(
    tileShapeGetRampHeight(TILE_SHAPE_RAMP_NORTHEAST_INNER, 1.0f, 0.0f),
    1.0f, 0.0001f
  );

  assert_int_equal(memoryGetAllocatedCount(), 0);
}

int main(void) {
  const struct CMUnitTest tests[] = {
    cmocka_unit_test(test_tileShapeGetRampHeightGroundIsAlwaysFlat),
    cmocka_unit_test(test_tileShapeGetRampHeightCardinalRamps),
    cmocka_unit_test(test_tileShapeGetRampHeightOuterCornerRamps),
    cmocka_unit_test(test_tileShapeGetRampHeightInnerCornerRamp),
  };

  return cmocka_run_group_tests(tests, NULL, NULL);
}