X-Git-Url: http://git.mutantstargoat.com?p=demo;a=blobdiff_plain;f=src%2Fcamera.cc;h=0f7773e75be449e2b73226b1306a2034a507176c;hp=d7839b57322f0419c0b7b97e193458b299d25382;hb=63d7f3b0e70ab5e3d530c579b1881967c96b0b92;hpb=f906c6d5d6b93dcc4c0f3d54e679cf86c829b91e

diff --git a/src/camera.cc b/src/camera.cc
index d7839b5..0f7773e 100644
--- a/src/camera.cc
+++ b/src/camera.cc
@@ -1,20 +1,58 @@
+#include <math.h>
+
 #include <gmath/gmath.h>
+
 #include "camera.h"
+#include "state_manager.h"
+
+Camera::Camera() {}
+Camera::~Camera() {}
+
+void Camera::use() const
+{
+	state_manager.set_state("st_view_matrix", get_view_matrix());
+}
 
-Camera::Camera()
+OrbitCamera::OrbitCamera()
 {
 	phi = theta = distance = 0;
-	fov = 0;
-	m_projection = Mat4::identity;
 }
 
-Camera::Camera(float phi, float theta, float distance, float fov)
+OrbitCamera::~OrbitCamera() {}
+
+void OrbitCamera::set_orbit_params(float phi, float theta, float distance)
 {
 	this->phi = phi;
 	this->theta = theta;
 	this->distance = distance;
+}
 
-	this->fov = fov;
+Mat4 OrbitCamera::get_view_matrix() const
+{
+	Mat4 view_matrix;
+	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;
 }
 
-Camera::~Camera() {}
\ No newline at end of file
+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;
+}
\ No newline at end of file