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Diffstat (limited to 'tests/vertex-clip-test.c')
| -rw-r--r-- | tests/vertex-clip-test.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/tests/vertex-clip-test.c b/tests/vertex-clip-test.c new file mode 100644 index 00000000..5b2e08c5 --- /dev/null +++ b/tests/vertex-clip-test.c @@ -0,0 +1,219 @@ +/* + * Copyright © 2013 Sam Spilsbury <smspillaz@gmail.com> + * + * Permission to use, copy, modify, distribute, and sell this software and + * its documentation for any purpose is hereby granted without fee, provided + * that the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of the copyright holders not be used in + * advertising or publicity pertaining to distribution of the software + * without specific, written prior permission. The copyright holders make + * no representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF + * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> + +#include "weston-test-runner.h" + +#include "../src/vertex-clipping.h" + +#define BOUNDING_BOX_TOP_Y 100.0f +#define BOUNDING_BOX_LEFT_X 50.0f +#define BOUNDING_BOX_RIGHT_X 100.0f +#define BOUNDING_BOX_BOTTOM_Y 50.0f + +#define INSIDE_X1 (BOUNDING_BOX_LEFT_X + 1.0f) +#define INSIDE_X2 (BOUNDING_BOX_RIGHT_X - 1.0f) +#define INSIDE_Y1 (BOUNDING_BOX_BOTTOM_Y + 1.0f) +#define INSIDE_Y2 (BOUNDING_BOX_TOP_Y - 1.0f) + +#define OUTSIDE_X1 (BOUNDING_BOX_LEFT_X - 1.0f) +#define OUTSIDE_X2 (BOUNDING_BOX_RIGHT_X + 1.0f) +#define OUTSIDE_Y1 (BOUNDING_BOX_BOTTOM_Y - 1.0f) +#define OUTSIDE_Y2 (BOUNDING_BOX_TOP_Y + 1.0f) + +static void +populate_clip_context (struct clip_context *ctx) +{ + ctx->clip.x1 = BOUNDING_BOX_LEFT_X; + ctx->clip.y1 = BOUNDING_BOX_BOTTOM_Y; + ctx->clip.x2 = BOUNDING_BOX_RIGHT_X; + ctx->clip.y2 = BOUNDING_BOX_TOP_Y; +} + +static int +clip_polygon (struct clip_context *ctx, + struct polygon8 *polygon, + GLfloat *vertices_x, + GLfloat *vertices_y) +{ + populate_clip_context(ctx); + return clip_transformed(ctx, polygon, vertices_x, vertices_y); +} + +struct vertex_clip_test_data +{ + struct polygon8 surface; + struct polygon8 expected; +}; + +const struct vertex_clip_test_data test_data[] = +{ + /* All inside */ + { + { + { INSIDE_X1, INSIDE_X2, INSIDE_X2, INSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + }, + { + { INSIDE_X1, INSIDE_X2, INSIDE_X2, INSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + } + }, + /* Top outside */ + { + { + { INSIDE_X1, INSIDE_X2, INSIDE_X2, INSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, OUTSIDE_Y2, OUTSIDE_Y2 }, + 4 + }, + { + { INSIDE_X1, INSIDE_X1, INSIDE_X2, INSIDE_X2 }, + { BOUNDING_BOX_TOP_Y, INSIDE_Y1, INSIDE_Y1, BOUNDING_BOX_TOP_Y }, + 4 + } + }, + /* Bottom outside */ + { + { + { INSIDE_X1, INSIDE_X2, INSIDE_X2, INSIDE_X1 }, + { OUTSIDE_Y1, OUTSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + }, + { + { INSIDE_X1, INSIDE_X2, INSIDE_X2, INSIDE_X1 }, + { BOUNDING_BOX_BOTTOM_Y, BOUNDING_BOX_BOTTOM_Y, INSIDE_Y2, INSIDE_Y2 }, + 4 + } + }, + /* Left outside */ + { + { + { OUTSIDE_X1, INSIDE_X2, INSIDE_X2, OUTSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + }, + { + { BOUNDING_BOX_LEFT_X, INSIDE_X2, INSIDE_X2, BOUNDING_BOX_LEFT_X }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + } + }, + /* Right outside */ + { + { + { INSIDE_X1, OUTSIDE_X2, OUTSIDE_X2, INSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + }, + { + { INSIDE_X1, BOUNDING_BOX_RIGHT_X, BOUNDING_BOX_RIGHT_X, INSIDE_X1 }, + { INSIDE_Y1, INSIDE_Y1, INSIDE_Y2, INSIDE_Y2 }, + 4 + } + }, + /* Diamond extending from bounding box edges, clip to bounding box */ + { + { + { BOUNDING_BOX_LEFT_X - 25, BOUNDING_BOX_LEFT_X + 25, BOUNDING_BOX_RIGHT_X + 25, BOUNDING_BOX_RIGHT_X - 25 }, + { BOUNDING_BOX_BOTTOM_Y + 25, BOUNDING_BOX_TOP_Y + 25, BOUNDING_BOX_TOP_Y - 25, BOUNDING_BOX_BOTTOM_Y - 25 }, + 4 + }, + { + { BOUNDING_BOX_LEFT_X, BOUNDING_BOX_LEFT_X, BOUNDING_BOX_RIGHT_X, BOUNDING_BOX_RIGHT_X }, + { BOUNDING_BOX_BOTTOM_Y, BOUNDING_BOX_TOP_Y, BOUNDING_BOX_TOP_Y, BOUNDING_BOX_BOTTOM_Y }, + 4 + } + }, + /* Diamond inside of bounding box edges, clip t bounding box, 8 resulting vertices */ + { + { + { BOUNDING_BOX_LEFT_X - 12.5, BOUNDING_BOX_LEFT_X + 25, BOUNDING_BOX_RIGHT_X + 12.5, BOUNDING_BOX_RIGHT_X - 25 }, + { BOUNDING_BOX_BOTTOM_Y + 25, BOUNDING_BOX_TOP_Y + 12.5, BOUNDING_BOX_TOP_Y - 25, BOUNDING_BOX_BOTTOM_Y - 12.5 }, + 4 + }, + { + { BOUNDING_BOX_LEFT_X + 12.5, BOUNDING_BOX_LEFT_X, BOUNDING_BOX_LEFT_X, BOUNDING_BOX_LEFT_X + 12.5, + BOUNDING_BOX_RIGHT_X - 12.5, BOUNDING_BOX_RIGHT_X, BOUNDING_BOX_RIGHT_X, BOUNDING_BOX_RIGHT_X - 12.5 }, + { BOUNDING_BOX_BOTTOM_Y, BOUNDING_BOX_BOTTOM_Y + 12.5, BOUNDING_BOX_TOP_Y - 12.5, BOUNDING_BOX_TOP_Y, + BOUNDING_BOX_TOP_Y, BOUNDING_BOX_TOP_Y - 12.5, BOUNDING_BOX_BOTTOM_Y + 12.5, BOUNDING_BOX_BOTTOM_Y }, + 8 + } + } +}; + +/* clip_polygon modifies the source operand and the test data must + * be const, so we need to deep copy it */ +static void +deep_copy_polygon8(const struct polygon8 *src, struct polygon8 *dst) +{ + dst->n = src->n; + memcpy((void *) dst->x, src->x, sizeof (src->x)); + memcpy((void *) dst->y, src->y, sizeof (src->y)); +} + +TEST_P(clip_polygon_n_vertices_emitted, test_data) +{ + struct vertex_clip_test_data *tdata = data; + struct clip_context ctx; + struct polygon8 polygon; + GLfloat vertices_x[8]; + GLfloat vertices_y[8]; + deep_copy_polygon8(&tdata->surface, &polygon); + int emitted = clip_polygon(&ctx, &polygon, vertices_x, vertices_y); + + assert(emitted == tdata->expected.n); +} + +TEST_P(clip_polygon_expected_vertices, test_data) +{ + struct vertex_clip_test_data *tdata = data; + struct clip_context ctx; + struct polygon8 polygon; + GLfloat vertices_x[8]; + GLfloat vertices_y[8]; + deep_copy_polygon8(&tdata->surface, &polygon); + int emitted = clip_polygon(&ctx, &polygon, vertices_x, vertices_y); + int i = 0; + + for (; i < emitted; ++i) + { + assert(vertices_x[i] == tdata->expected.x[i]); + assert(vertices_y[i] == tdata->expected.y[i]); + } +} + +TEST(float_difference_different) +{ + assert(float_difference(1.0f, 0.0f) == 1.0f); +} + +TEST(float_difference_same) +{ + assert(float_difference(1.0f, 1.0f) == 0.0f); +} + |