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/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mir/test/doubles/mock_buffer.h"
#include <glm/gtc/matrix_transform.hpp>
#include <mir/gl/tessellation_helpers.h>
#include <mir/test/doubles/mock_renderable.h>
using namespace testing;
namespace geom = mir::geometry;
namespace mt = mir::test;
namespace mtd = mir::test::doubles;
namespace mgl = mir::gl;
namespace mg = mir::graphics;
struct BoundingBox
{
float left, right, top, bottom;
static auto from(geom::Rectangle const& rect) -> BoundingBox
{
return BoundingBox{
static_cast<float>(rect.left().as_int()),
static_cast<float>(rect.right().as_int()),
static_cast<float>(rect.top().as_int()),
static_cast<float>(rect.bottom().as_int())};
}
auto operator==(BoundingBox const& other) const -> bool
{
return left == other.left &&
right == other.right &&
top == other.top &&
bottom == other.bottom;
}
};
auto operator<<(std::ostream& os, const BoundingBox& bb) -> std::ostream&
{
os << "{ left=" << bb.left << ", right=" << bb.right << ", top=" << bb.top << ", bottom=" << bb.bottom << " }";
return os;
}
class Tessellation : public testing::Test
{
public:
void SetUp() override
{
ON_CALL(renderable, screen_position())
.WillByDefault(Return(rect));
ON_CALL(renderable, src_bounds())
.WillByDefault(Return(geom::RectangleD{{0, 0}, {geom::SizeD{rect.size}}}));
ON_CALL(renderable, buffer())
.WillByDefault(Return(buffer_));
}
static auto bounding_box(mgl::Primitive const& primitive) -> BoundingBox
{
BoundingBox box{
std::numeric_limits<float>::max(),
std::numeric_limits<float>::min(),
std::numeric_limits<float>::max(),
std::numeric_limits<float>::min()};
for (int i = 0; i < primitive.nvertices; i++)
{
box.left = std::min(box.left, primitive.vertices[i].position[0]);
box.right = std::max(box.right, primitive.vertices[i].position[0]);
box.top = std::min(box.top, primitive.vertices[i].position[1]);
box.bottom = std::max(box.bottom, primitive.vertices[i].position[1]);
}
return box;
}
static void expect_tex_coords_1_or_0(mgl::Primitive const& primitive)
{
for (int i = 0; i < primitive.nvertices; i++)
{
for (int axis = 0; axis < 2; axis++)
{
float const tex_coord = primitive.vertices[i].texcoord[axis];
EXPECT_THAT(tex_coord, AnyOf(Eq(1.0f), Eq(0.0f))) << "axis=" << axis;
}
}
}
geom::Rectangle const rect{{4, 6}, {10, 20}};
NiceMock<mtd::MockRenderable> const renderable;
std::shared_ptr<mg::Buffer> const buffer_ = std::make_shared<NiceMock<mtd::MockBuffer>>(rect.size, geom::Stride{}, mir_pixel_format_argb_8888);
};
TEST_F(Tessellation, has_4_vertices)
{
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, {});
EXPECT_THAT(primitive.type, Eq(GL_TRIANGLE_STRIP));
EXPECT_THAT(primitive.nvertices, Eq(4));
}
TEST_F(Tessellation, has_correct_bounding_box)
{
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, {});
auto const box = bounding_box(primitive);
EXPECT_THAT(box, Eq(BoundingBox::from(rect)));
}
TEST_F(Tessellation, bounding_box_gets_offset)
{
geom::Displacement const offset{3, 8};
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, offset);
auto const box = bounding_box(primitive);
geom::Rectangle const expected{rect.top_left - offset, rect.size};
EXPECT_THAT(box, Eq(BoundingBox::from(expected)));
}
TEST_F(Tessellation, vertex_zs_are_1)
{
int const x{3}, y{8};
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, {x, y});
for (int i = 0; i < primitive.nvertices; i++)
{
EXPECT_THAT(primitive.vertices[i].position[2], Eq(0)) << "for i = " << i;
}
}
TEST_F(Tessellation, tex_coords_0_or_1)
{
int const x{3}, y{8};
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, {x, y});
expect_tex_coords_1_or_0(primitive);
}
TEST_F(Tessellation, tex_coords_0_or_1_when_transformed)
{
int const x{3}, y{8};
ON_CALL(renderable, transformation())
.WillByDefault(testing::Return(glm::scale(glm::mat4(1.0f), glm::vec3(2.5f))));
mgl::Primitive const primitive = mgl::tessellate_renderable_into_rectangle(renderable, {x, y});
expect_tex_coords_1_or_0(primitive);
}
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