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/*
* 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);
}
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