X-Git-Url: https://eleni.mutantstargoat.com/git/?p=vkrt;a=blobdiff_plain;f=src%2Fcamera.cc;fp=src%2Fcamera.cc;h=620bec4e518eb44b3341382d32d4e73b50a63843;hp=0000000000000000000000000000000000000000;hb=470723fe1cc3902759399a023a062051c460bd1f;hpb=6c8e0d1dcf1e08982b54a1b2d2e914e409e09386

diff --git a/src/camera.cc b/src/camera.cc
new file mode 100644
index 0000000..620bec4
--- /dev/null
+++ b/src/camera.cc
@@ -0,0 +1,60 @@
+#include <math.h>
+
+#include <gmath/gmath.h>
+
+#include "camera.h"
+
+Camera::Camera() {}
+Camera::~Camera() {}
+
+OrbitCamera::OrbitCamera()
+{
+	phi = theta = distance = 0;
+}
+
+OrbitCamera::~OrbitCamera() {}
+
+void OrbitCamera::set_orbit_params(float theta, float phi, float distance)
+{
+	this->phi = phi;
+	this->theta = theta;
+	this->distance = distance;
+}
+
+Mat4 OrbitCamera::get_view_matrix() const
+{
+	Mat4 view_matrix;
+	view_matrix.translation(-position);
+	view_matrix.rotate_y(theta * (float)M_PI / 180);
+	view_matrix.rotate_x(phi * (float)M_PI / 180);
+	view_matrix.translate(Vec3(0, 0, -distance));
+
+	return view_matrix;
+}
+
+Mat4 calc_projection_matrix(float fov_deg, float aspect, float n, float f)
+{
+	float fov = fov_deg / 180 * M_PI;
+
+	float tmp;
+	tmp = 1 / tan(fov / 2.0);
+
+	/* near - far clipping planes */
+	float range = n - f;
+
+	Mat4 pmat = Mat4(
+	                tmp/aspect,	    0,		0,					0,
+	                0,				tmp,	0,					0,
+	                0,				0,	    (f + n) / range,	-1,
+	                0,				0,		2 * n * f / range,  0
+	            );
+
+	return pmat;
+}
+
+void OrbitCamera::set_position(float x, float y, float z)
+{
+	position.x = x;
+	position.y = y;
+	position.z = z;
+}