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Introduce perspective projection matrix.

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Also correct a bug where the view matrix was not being used.
This commit is contained in:
David Allemang
2020-10-13 10:57:30 -04:00
parent 49927568e4
commit 6ff09dc375
3 changed files with 30 additions and 5 deletions
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26
vis/include/geometry.hpp
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@@ -27,8 +27,8 @@ using mat3 = mat<3>;
using mat4 = mat<4>;
using mat5 = mat<5>;
mat4 ortho(float left, float right, float bottom, float top, float front, float back) {
mat<4> res = mat4();
mat4 orthographic(float left, float right, float bottom, float top, float front, float back) {
mat4 res = mat4();
res <<
2 / (right - left), 0, 0, -(right + left) / (right - left),
0, 2 / (top - bottom), 0, -(top + bottom) / (top - bottom),
@@ -36,3 +36,25 @@ mat4 ortho(float left, float right, float bottom, float top, float front, float
0, 0, 0, 1;
return res;
}
mat4 perspective(float fovy, float aspect, float zNear, float zFar) {
float tanHalfFovy(std::tan(fovy / 2));
mat4 res = mat4::Identity();
res(0, 0) = 1 / (aspect * tanHalfFovy);
res(1, 1) = 1 / (tanHalfFovy);
res(2, 2) = -(zFar + zNear) / (zFar - zNear);
res(3, 2) = -1;
res(2, 3) = -(2 + zFar * zNear) / (zFar - zNear);
return res;
}
mat4 translation(float x, float y, float z) {
mat4 res = mat4();
res <<
1, 0, 0, x,
0, 1, 0, y,
0, 0, 1, z,
0, 0, 0, 1;
return res;
}