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tests: Add quad clipper tests
Add quad clipping tests checking intersections at all edges and corners of axis-aligned and unaligned quads with negative and positive values. Signed-off-by: Loïc Molinari <loic.molinari@collabora.com>
This commit is contained in:
Loïc Molinari
Pekka Paalanen
parent
60877f5f55
commit
1f9637ec8e
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@ -332,7 +332,7 @@ clipper_clip(const struct clipper_vertex *polygon,
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return n;
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}
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void
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WESTON_EXPORT_FOR_TESTS void
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clipper_quad_init(struct clipper_quad *quad,
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const struct clipper_vertex polygon[4],
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bool axis_aligned)
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@ -356,7 +356,7 @@ clipper_quad_init(struct clipper_quad *quad,
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}
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}
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int
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WESTON_EXPORT_FOR_TESTS int
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clipper_quad_clip(struct clipper_quad *quad,
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const struct clipper_vertex box[2],
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struct clipper_vertex *restrict vertices)
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@ -42,6 +42,7 @@ struct vertex_clip_test_data {
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struct clipper_vertex clipped[8];
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int polygon_n;
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int clipped_n;
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bool aligned;
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};
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/* Compare clipped vertices to expected vertices. While the clipper guarantees
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@ -177,6 +178,469 @@ TEST(clip_size_too_high)
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assert(clipper_clip(polygon, 9, box, NULL) == -1);
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}
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/* clipper_quad_clip() tests: */
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static const struct vertex_clip_test_data quad_clip_expected_data[] = {
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/* Aligned quad clipping with adjacent edges: */
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/* Box top/left corner adjacent to polygon bottom/right corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-1.00f, -1.00f, -0.50f, -0.50f),
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.clipped_n = 0,
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},
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/* Box top edge adjacent to polygon bottom edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.25f, -1.00f, 0.25f, -0.50f),
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.clipped_n = 0,
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},
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/* Box top/right corner adjacent to polygon bottom/left corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.50f, -1.00f, 1.00f, -0.50f),
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.clipped_n = 0,
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},
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/* Box left edge adjacent to polygon right edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-1.00f, -0.25f, -0.50f, 0.25f),
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.clipped_n = 0,
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},
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/* Box right edge adjacent to polygon left edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.50f, -0.25f, 1.00f, 0.25f),
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.clipped_n = 0,
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},
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/* Box bottom/left corner adjacent to polygon top/right corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-1.00f, 0.50f, -0.50f, 1.00f),
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.clipped_n = 0,
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},
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/* Box bottom edge adjacent to polygon top edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.25f, 0.50f, 0.25f, 1.00f),
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.clipped_n = 0,
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},
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/* Box bottom/right corner adjacent to polygon top/left corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.50f, 0.50f, 1.00f, 1.00f),
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.clipped_n = 0,
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},
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/* Aligned quad clipping with intersecting edges: */
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/* Box top/left corner intersects polygon bottom/right corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.75f, -0.75f, -0.25f, -0.25f),
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.clipped = QUAD(-0.50f, -0.50f, -0.25f, -0.25f),
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.clipped_n = 4,
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},
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/* Box top edge intersects polygon bottom edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.25f, -0.75f, 0.25f, -0.25f),
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.clipped = QUAD(-0.25f, -0.50f, 0.25f, -0.25f),
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.clipped_n = 4,
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},
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/* Box top/right corner intersects polygon bottom/left corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.25f, -0.75f, 0.75f, -0.25f),
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.clipped = QUAD( 0.25f, -0.50f, 0.50f, -0.25f),
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.clipped_n = 4,
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},
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/* Box left edge intersects polygon right edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.75f, -0.25f, -0.25f, 0.25f),
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.clipped = QUAD(-0.50f, -0.25f, -0.25f, 0.25f),
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.clipped_n = 4,
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},
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/* Box right edge intersects polygon left edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.25f, -0.25f, 0.75f, 0.25f),
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.clipped = QUAD( 0.25f, -0.25f, 0.50f, 0.25f),
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.clipped_n = 4,
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},
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/* Box bottom/left corner intersects polygon top/right corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.75f, 0.25f, -0.25f, 0.75f),
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.clipped = QUAD(-0.50f, 0.25f, -0.25f, 0.50f),
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.clipped_n = 4,
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},
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/* Box bottom edge intersects polygon top edge. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD(-0.25f, 0.25f, 0.25f, 0.75f),
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.clipped = QUAD(-0.25f, 0.25f, 0.25f, 0.50f),
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.clipped_n = 4,
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},
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/* Box bottom/right corner intersects polygon top/left corner. */
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{
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.aligned = true,
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.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
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.polygon = QUAD( 0.25f, 0.25f, 0.75f, 0.75f),
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.clipped = QUAD( 0.25f, 0.25f, 0.50f, 0.50f),
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.clipped_n = 4,
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},
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/* Rotated quad clipping with adjacent edges: */
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/* Box top/left corner adjacent to polygon bottom corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.75f, -0.75f}, {-0.50f, -1.00f},
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{-0.25f, -0.75f}, {-0.50f, -0.50f}},
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.clipped_n = 0,
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},
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/* Box top edge adjacent to polygon bottom corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.25f, -0.75f}, { 0.00f, -1.00f},
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{ 0.25f, -0.75f}, { 0.00f, -0.50f}},
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.clipped_n = 0,
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},
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/* Box top/right corner adjacent to polygon bottom corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.25f, -0.75f}, { 0.50f, -1.00f},
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{ 0.75f, -0.75f}, { 0.50f, -0.50f}},
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.clipped_n = 0,
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},
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/* Box left edge adjacent to polygon right corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-1.00f, 0.00f}, {-0.75f, -0.25f},
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{-0.50f, 0.00f}, {-0.75f, 0.25f}},
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.clipped_n = 0,
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},
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/* Box right edge adjacent to polygon left corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.50f, 0.00f}, { 0.75f, -0.25f},
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{ 1.00f, 0.00f}, { 0.75f, 0.25f}},
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.clipped_n = 0,
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},
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/* Box bottom/left corner adjacent to polygon top corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.75f, 0.75f}, {-0.50f, 0.50f},
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{-0.25f, 0.75f}, {-0.50f, 1.00f}},
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.clipped_n = 0,
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},
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/* Box bottom edge adjacent to polygon top corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.25f, 0.75f}, { 0.00f, 0.50f},
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{ 0.25f, 0.75f}, { 0.00f, 1.00f}},
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.clipped_n = 0,
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},
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/* Box bottom/right corner adjacent to polygon top corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.25f, 0.75f}, { 0.50f, 0.50f},
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{ 0.75f, 0.75f}, { 0.50f, 1.00f}},
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.clipped_n = 0,
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},
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/* Rotated quad clipping with slightly intersecting edges: */
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/* Box top/left corner slightly intersects polygon bottom/right edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.75f, -0.50f}, {-0.50f, -0.75f},
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{-0.25f, -0.50f}, {-0.50f, -0.25f}},
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.clipped = {{-0.50f, -0.25f}, {-0.50f, -0.50f},
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{-0.25f, -0.50f}},
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.clipped_n = 3,
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},
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/* Box top edge slightly intersects polygon bottom corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.25f, -0.50f}, { 0.00f, -0.75f},
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{ 0.25f, -0.50f}, { 0.00f, -0.25f}},
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.clipped = {{-0.25f, -0.50f}, { 0.25f, -0.50f},
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{ 0.00f, -0.25f}},
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.clipped_n = 3,
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},
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/* Box top/right corner slightly intersects polygon bottom/left edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.25f, -0.50f}, { 0.50f, -0.75f},
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{ 0.75f, -0.50f}, { 0.50f, -0.25f}},
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.clipped = {{ 0.25f, -0.50f}, { 0.50f, -0.50f},
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{ 0.50f, -0.25f}},
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.clipped_n = 3,
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},
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/* Box left edge slightly intersects polygon right corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.75f, 0.00f}, {-0.50f, -0.25f},
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{-0.25f, 0.00f}, {-0.50f, 0.25f}},
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.clipped = {{-0.50f, -0.25f}, {-0.25f, 0.00f},
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{-0.50f, 0.25f}},
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.clipped_n = 3,
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},
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/* Box right edge slightly intersects polygon left corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.25f, 0.00f}, { 0.50f, -0.25f},
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{ 0.75f, 0.00f}, { 0.50f, 0.25f}},
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.clipped = {{ 0.25f, 0.00f}, { 0.50f, -0.25f},
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{ 0.50f, 0.25f}},
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.clipped_n = 3,
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},
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/* Box bottom/left corner slightly intersects polygon top/right edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.75f, 0.50f}, {-0.50f, 0.25f},
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{-0.25f, 0.50f}, {-0.50f, 0.75f}},
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.clipped = {{-0.50f, 0.25f}, {-0.25f, 0.50f},
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{-0.50f, 0.50f}},
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.clipped_n = 3,
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},
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/* Box bottom edge slightly intersects polygon top corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.25f, 0.50f}, { 0.00f, 0.25f},
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{ 0.25f, 0.50f}, { 0.00f, 0.75f}},
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.clipped = {{-0.25f, 0.50f}, { 0.00f, 0.25f},
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{ 0.25f, 0.50f}},
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.clipped_n = 3,
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},
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/* Box bottom/right corner slightly intersects polygon top/left edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.25f, 0.50f}, { 0.50f, 0.25f},
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{ 0.75f, 0.50f}, { 0.50f, 0.75f}},
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.clipped = {{ 0.25f, 0.50f}, { 0.50f, 0.25f},
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{ 0.50f, 0.50f}},
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.clipped_n = 3,
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},
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/* Rotated quad clipping with largely intersecting edges: */
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/* Box top/left corner largely intersects polygon bottom/right edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.625f, -0.375f}, {-0.375f, -0.625f},
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{-0.125f, -0.375f}, {-0.375f, -0.125f}},
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.clipped = {{-0.500f, -0.500f}, {-0.250f, -0.500f},
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{-0.125f, -0.375f}, {-0.375f, -0.125f},
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{-0.500f, -0.250f}},
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.clipped_n = 5,
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},
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/* Box top edge largely intersects polygon bottom corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.250f, -0.375f}, { 0.000f, -0.625f},
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{ 0.250f, -0.375f}, { 0.000f, -0.125f}},
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.clipped = {{-0.125f, -0.500f}, { 0.125f, -0.500f},
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{ 0.250f, -0.375f}, { 0.000f, -0.125f},
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{-0.250f, -0.375f}},
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.clipped_n = 5,
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},
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/* Box top/right corner largely intersects polygon bottom/left edge. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{ 0.125f, -0.375f}, { 0.375f, -0.625f},
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{ 0.625f, -0.375f}, { 0.375f, -0.125f}},
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.clipped = {{ 0.125f, -0.375f}, { 0.250f, -0.500f},
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{ 0.500f, -0.500f}, { 0.500f, -0.250f},
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{ 0.375f, -0.125f}},
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.clipped_n = 5,
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},
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/* Box left edge largely intersects polygon right corner. */
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{
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.aligned = false,
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.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
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.polygon = {{-0.625f, 0.000f}, {-0.375f, -0.250f},
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{-0.125f, 0.000f}, {-0.375f, 0.250f}},
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.clipped = {{-0.500f, 0.125f}, {-0.500f, -0.125f},
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{-0.375f, -0.250f}, {-0.125f, 0.000f},
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{-0.375f, 0.250f}},
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.clipped_n = 5,
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},
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/* Box right edge largely intersects polygon left corner. */
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||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{ 0.125f, 0.000f}, { 0.375f, -0.250f},
|
||||
{ 0.625f, 0.000f}, { 0.375f, 0.250f}},
|
||||
.clipped = {{ 0.125f, 0.000f}, { 0.375f, -0.250f},
|
||||
{ 0.500f, -0.125f}, { 0.500f, 0.125f},
|
||||
{ 0.375f, 0.250f}},
|
||||
.clipped_n = 5,
|
||||
},
|
||||
|
||||
/* Box bottom/left corner largely intersects polygon top/right edge. */
|
||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{-0.625f, 0.375f}, {-0.375f, 0.125f},
|
||||
{-0.125f, 0.375f}, {-0.375f, 0.625f}},
|
||||
.clipped = {{-0.500f, 0.500f}, {-0.500f, 0.250f},
|
||||
{-0.375f, 0.125f}, {-0.125f, 0.375f},
|
||||
{-0.250f, 0.500f}},
|
||||
.clipped_n = 5,
|
||||
},
|
||||
|
||||
/* Box bottom edge largely intersects polygon top corner. */
|
||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{-0.250f, 0.375f}, { 0.000f, 0.125f},
|
||||
{ 0.250f, 0.375f}, { 0.000f, 0.625f}},
|
||||
.clipped = {{-0.125f, 0.500f}, {-0.250f, 0.375f},
|
||||
{ 0.000f, 0.125f}, { 0.250f, 0.375f},
|
||||
{ 0.125f, 0.500f}},
|
||||
.clipped_n = 5,
|
||||
},
|
||||
|
||||
/* Box bottom/right corner largely intersects polygon top/left edge. */
|
||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{ 0.125f, 0.375f}, { 0.375f, 0.125f},
|
||||
{ 0.625f, 0.375f}, { 0.375f, 0.625f}},
|
||||
.clipped = {{ 0.125f, 0.375f}, { 0.375f, 0.125f},
|
||||
{ 0.500f, 0.250f}, { 0.500f, 0.500f},
|
||||
{ 0.250f, 0.500f}},
|
||||
.clipped_n = 5,
|
||||
},
|
||||
|
||||
/* Miscellaneous cases: */
|
||||
|
||||
/* Box intersects entire smaller aligned quad. */
|
||||
{
|
||||
.aligned = true,
|
||||
.box = BOX (-0.50f, -0.50f, 0.50f, 0.50f),
|
||||
.polygon = QUAD(-0.25f, -0.25f, 0.25f, 0.25f),
|
||||
.clipped = QUAD(-0.25f, -0.25f, 0.25f, 0.25f),
|
||||
.clipped_n = 4,
|
||||
},
|
||||
|
||||
/* Box intersects entire same size aligned quad. */
|
||||
{
|
||||
.aligned = true,
|
||||
.box = BOX (-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = QUAD(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.clipped = QUAD(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.clipped_n = 4,
|
||||
},
|
||||
|
||||
/* Box intersects entire rotated quad. */
|
||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{-0.5f, 0.0f}, { 0.0f, -0.5f},
|
||||
{ 0.5f, 0.0f}, { 0.0f, 0.5f}},
|
||||
.clipped = {{-0.5f, 0.0f}, { 0.0f, -0.5f},
|
||||
{ 0.5f, 0.0f}, { 0.0f, 0.5f}},
|
||||
.clipped_n = 4,
|
||||
},
|
||||
|
||||
/* Box intersects rotated quad cutting out the 4 corners. */
|
||||
{
|
||||
.aligned = false,
|
||||
.box = BOX(-0.5f, -0.5f, 0.5f, 0.5f),
|
||||
.polygon = {{-0.75f, 0.00f}, { 0.00f, -0.75f},
|
||||
{ 0.75f, 0.00f}, { 0.00f, 0.75f}},
|
||||
.clipped = {{-0.50f, 0.25f}, {-0.50f, -0.25f},
|
||||
{-0.25f, -0.50f}, { 0.25f, -0.50f},
|
||||
{ 0.50f, -0.25f}, { 0.50f, 0.25f},
|
||||
{ 0.25f, 0.50f}, {-0.25f, 0.50f}},
|
||||
.clipped_n = 8,
|
||||
},
|
||||
};
|
||||
|
||||
TEST_P(quad_clip_expected, quad_clip_expected_data)
|
||||
{
|
||||
struct vertex_clip_test_data *tdata = data;
|
||||
struct clipper_vertex clipped[8];
|
||||
struct clipper_quad quad;
|
||||
int clipped_n;
|
||||
|
||||
clipper_quad_init(&quad, tdata->polygon, tdata->aligned);
|
||||
clipped_n = clipper_quad_clip(&quad, tdata->box, clipped);
|
||||
|
||||
assert_vertices(clipped, clipped_n, tdata->clipped, tdata->clipped_n);
|
||||
}
|
||||
|
||||
/* clipper_float_difference() tests: */
|
||||
|
||||
TEST(float_difference_different)
|
||||
|
|
|
|||
Loading…
Reference in a new issue