anulax
/
glm
1
0
Fork 0
Code Issues Pull Requests Packages project_board Releases Wiki Activity

Merge pull request #1099 from Windsander/shearing

Browse Source 
feat:    add shearing matrix operation on matrix_transfom #1099
master
Christophe ago%!(EXTRA string=4 years) committed by GitHub
parent 816e9b70fb 0f318f63af
commit b2a9dae6dc
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 163 additions and 2 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 29
      glm/ext/matrix_transform.hpp
  2. 54
      glm/ext/matrix_transform.inl
  3. 82
      test/core/core_func_matrix.cpp

29
glm/ext/matrix_transform.hpp
Unescape View File

@ -95,7 +95,34 @@ namespace glm
GLM_FUNC_DECL mat<4, 4, T, Q> scale(
mat<4, 4, T, Q> const& m, vec<3, T, Q> const& v);
/// Build a right handed look at view matrix.
/// Builds a scale 4 * 4 matrix created from point referent 3 shearers.
///
/// @param m Input matrix multiplied by this shear matrix.
/// @param p Point of shearing as reference.
/// @param l_x Ratio of matrix.x projection in YZ plane relative to the y-axis/z-axis.
/// @param l_y Ratio of matrix.y projection in XZ plane relative to the x-axis/z-axis.
/// @param l_z Ratio of matrix.z projection in XY plane relative to the x-axis/y-axis.
///
/// as example:
/// [1 , l_xy, l_xz, -(l_xy+l_xz) * p_x] [x] T
/// [x`, y`, z`, w`] = [x`, y`, z`, w`] * [l_yx, 1 , l_yz, -(l_yx+l_yz) * p_y] [y]
/// [l_zx, l_zy, 1 , -(l_zx+l_zy) * p_z] [z]
/// [0 , 0 , 0 , 1 ] [w]
///
/// @tparam T A floating-point shear type
/// @tparam Q A value from qualifier enum
///
/// @see - shear(mat<4, 4, T, Q> const& m, T x, T y, T z)
/// @see - shear(vec<3, T, Q> const& p)
/// @see - shear(vec<2, T, Q> const& l_x)
/// @see - shear(vec<2, T, Q> const& l_y)
/// @see - shear(vec<2, T, Q> const& l_z)
/// @see no resource...
template <typename T, qualifier Q>
GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shear(
mat<4, 4, T, Q> const &m, vec<3, T, Q> const& p, vec<2, T, Q> const &l_x, vec<2, T, Q> const &l_y, vec<2, T, Q> const &l_z);
/// Build a right handed look at view matrix.
///
/// @param eye Position of the camera
/// @param center Position where the camera is looking at

54
glm/ext/matrix_transform.inl
Unescape View File

@ -95,6 +95,60 @@ namespace glm
return m * Result;
}
template <typename T, qualifier Q>
GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shear(mat<4, 4, T, Q> const &m, vec<3, T, Q> const& p, vec<2, T, Q> const &l_x, vec<2, T, Q> const &l_y, vec<2, T, Q> const &l_z)
{
T const lambda_xy = l_x[0];
T const lambda_xz = l_x[1];
T const lambda_yx = l_y[0];
T const lambda_yz = l_y[1];
T const lambda_zx = l_z[0];
T const lambda_zy = l_z[1];
vec<3, T, Q> point_lambda = vec<3, T, Q>(
(lambda_xy + lambda_xz), (lambda_yx + lambda_yz), (lambda_zx + lambda_zy)
);
mat<4, 4, T, Q> Shear = mat<4, 4, T, Q>(
1 , lambda_yx , lambda_zx , 0,
lambda_xy , 1 , lambda_zy , 0,
lambda_xz , lambda_yz , 1 , 0,
-point_lambda[0] * p[0], -point_lambda[1] * p[1], -point_lambda[2] * p[2], 1
);
mat<4, 4, T, Q> Result;
Result[0] = Shear[0] * m[0][0] + Shear[1] * m[0][1] + Shear[2] * m[0][2] + Shear[3] * m[0][3];
Result[1] = Shear[0] * m[1][0] + Shear[1] * m[1][1] + Shear[2] * m[1][2] + Shear[3] * m[1][3];
Result[2] = Shear[0] * m[2][0] + Shear[1] * m[2][1] + Shear[2] * m[2][2] + Shear[3] * m[2][3];
Result[3] = Shear[0] * m[3][0] + Shear[1] * m[3][1] + Shear[2] * m[3][2] + Shear[3] * m[3][3];
return Result;
}
template <typename T, qualifier Q>
GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shear_slow(mat<4, 4, T, Q> const &m, vec<3, T, Q> const& p, vec<2, T, Q> const &l_x, vec<2, T, Q> const &l_y, vec<2, T, Q> const &l_z)
{
T const lambda_xy = static_cast<T>(l_x[0]);
T const lambda_xz = static_cast<T>(l_x[1]);
T const lambda_yx = static_cast<T>(l_y[0]);
T const lambda_yz = static_cast<T>(l_y[1]);
T const lambda_zx = static_cast<T>(l_z[0]);
T const lambda_zy = static_cast<T>(l_z[1]);
vec<3, T, Q> point_lambda = vec<3, T, Q>(
static_cast<T>(lambda_xy + lambda_xz),
static_cast<T>(lambda_yx + lambda_yz),
static_cast<T>(lambda_zx + lambda_zy)
);
mat<4, 4, T, Q> Shear = mat<4, 4, T, Q>(
1 , lambda_yx , lambda_zx , 0,
lambda_xy , 1 , lambda_zy , 0,
lambda_xz , lambda_yz , 1 , 0,
-point_lambda[0] * p[0], -point_lambda[1] * p[1], -point_lambda[2] * p[2], 1
);
return m * Shear;
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER mat<4, 4, T, Q> lookAtRH(vec<3, T, Q> const& eye, vec<3, T, Q> const& center, vec<3, T, Q> const& up)
{

82
test/core/core_func_matrix.cpp
Unescape View File

@ -240,6 +240,85 @@ int test_inverse_simd()
return Error;
}
int test_shearing()
{
int Error = 0;
{
glm::vec3 const center(0, 0, 0);
glm::vec2 const l_x(2, 0);
glm::vec2 const l_y(0, 0);
glm::vec2 const l_z(0, 0);
glm::mat4x4 const A4x4(
glm::vec4(0, 0, 1, 1),
glm::vec4(0, 1, 1, 0),
glm::vec4(1, 1, 1, 0),
glm::vec4(1, 1, 0, 1));
glm::mat4x4 const B4x4 = glm::shear(A4x4, center, l_x, l_y, l_z);
glm::mat4x4 const expected(
glm::vec4(0, 0, 1, 1),
glm::vec4(2, 1, 1, 0),
glm::vec4(3, 1, 1, 0),
glm::vec4(3, 1, 0, 1));
Error += all(equal(B4x4, expected, epsilon<float>())) ? 0 : 1;
}
{
glm::vec3 const center(0, 0, 0);
glm::vec2 const l_x(1, 0);
glm::vec2 const l_y(0, 1);
glm::vec2 const l_z(1, 0);
glm::mat4x4 const A4x4(
glm::vec4(0, 0, 1, 0),
glm::vec4(0, 1, 1, 0),
glm::vec4(1, 1, 1, 0),
glm::vec4(1, 0, 0, 0));
glm::mat4x4 const B4x4 = glm::shear(A4x4, center, l_x, l_y, l_z);
glm::mat4x4 const expected(
glm::vec4(0, 1, 1, 0),
glm::vec4(1, 2, 1, 0),
glm::vec4(2, 2, 2, 0),
glm::vec4(1, 0, 1, 0));
Error += all(equal(B4x4, expected, epsilon<float>())) ? 0 : 1;
}
{
glm::vec3 const center(3, 2, 1);
glm::vec2 const l_x(1, 2);
glm::vec2 const l_y(3, 1);
glm::vec2 const l_z(4, 5);
glm::mat4x4 const A4x4(1);
glm::mat4x4 const B4x4 = glm::shear(A4x4, center, l_x, l_y, l_z);
glm::mat4x4 const expected(
glm::vec4(1, 3, 4, 0),
glm::vec4(1, 1, 5, 0),
glm::vec4(2, 1, 1, 0),
glm::vec4(-9, -8, -9, 1));
Error += all(equal(B4x4, expected, epsilon<float>())) ? 0 : 1;
}
{
glm::vec3 const center(3, 2, 1);
glm::vec2 const l_x(1, 2);
glm::vec2 const l_y(3, 1);
glm::vec2 const l_z(4, 5);
glm::mat4x4 const A4x4(
glm::vec4(-3, 2, 1, 0),
glm::vec4(3, 2, 1, 0),
glm::vec4(4, -8, 0, 0),
glm::vec4(7, 1, -2, 0));
glm::mat4x4 const B4x4 = glm::shear(A4x4, center, l_x, l_y, l_z);
glm::mat4x4 const expected(
glm::vec4(1, -6, -1, 0),
glm::vec4(7, 12, 23, 0),
glm::vec4(-4, 4, -24, 0),
glm::vec4(4, 20, 31, 0));
Error += all(equal(B4x4, expected, epsilon<float>())) ? 0 : 1;
}
return Error;
}
template<typename VEC3, typename MAT4>
int test_inverse_perf(std::size_t Count, std::size_t Instance, char const * Message)
{
@ -293,7 +372,8 @@ int main()
Error += test_transpose();
Error += test_determinant();
Error += test_inverse();
Error += test_inverse_simd();
Error += test_inverse_simd();
Error += test_shearing();
# ifdef NDEBUG
std::size_t const Samples = 1000;

Write Preview
Loading…
Cancel
Save