diff options
Diffstat (limited to 'mons_3d/src/projection.c')
| -rw-r--r-- | mons_3d/src/projection.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mons_3d/src/projection.c b/mons_3d/src/projection.c new file mode 100644 index 0000000..287d59e --- /dev/null +++ b/mons_3d/src/projection.c @@ -0,0 +1,15 @@ +#include "projection.h" +#include <math.h> +#include "mons_math/mat4.h" + +mons_mat4 mons_projection_matrix(mons_projection projection) { + float tangent = tanf(projection.fov / 2.0f); + float top = projection.near * tangent; + float right = top * projection.aspect_ratio; + return (mons_mat4){ + {projection.near / right, 0, 0, 0}, + {0, projection.near / top, 0, 0}, + {0, 0, -(projection.far + projection.near) / (projection.far - projection.near), -1}, + {0, 0, -(2.0f * projection.far * projection.near) / (projection.far - projection.near), 0}, + }; +} |