X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcamera.cpp;h=406135796f3e10c1cc0135cb23a097ee51e32259;hb=0119ca4f792dc761e5248b76de71f2844c0e3997;hp=b392f672380ed4a98c77a986d09e7f80e0dac81b;hpb=8f2430208cfa7bb9dc5bd655dde88acc21db54d2;p=libs%2Fgl.git

diff --git a/source/camera.cpp b/source/camera.cpp
index b392f672..40613579 100644
--- a/source/camera.cpp
+++ b/source/camera.cpp
@@ -1,14 +1,6 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2010  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #include <cmath>
 #include "camera.h"
 #include "matrix.h"
-#include "projection.h"
 
 namespace Msp {
 namespace GL {
@@ -21,11 +13,7 @@ Camera::Camera():
 	position(0, 0, 0),
 	look_dir(0, 0, -1),
 	up_dir(0, 1, 0)
-{
-	for(unsigned i=0; i<16; ++i)
-		matrix[i] = (i%5 ? 0 : 1);
-	matrix[10] = -1;
-}
+{ }
 
 void Camera::set_field_of_view(float f)
 {
@@ -51,54 +39,49 @@ void Camera::set_position(const Vector3 &p)
 
 void Camera::set_up_direction(const Vector3 &u)
 {
-	float len = sqrt(u.x*u.x+u.y*u.y+u.z*u.z);
-
-	up_dir.x = u.x/len;
-	up_dir.y = u.y/len;
-	up_dir.z = u.z/len;
+	up_dir = normalize(u);
 
 	compute_matrix();
 }
 
 void Camera::set_look_direction(const Vector3 &l)
 {
-	float len = sqrt(l.x*l.x+l.y*l.y+l.z*l.z);
-
-	look_dir.x = l.x/len;
-	look_dir.y = l.y/len;
-	look_dir.z = l.z/len;
+	look_dir = normalize(l);
 
 	compute_matrix();
 }
 
 void Camera::look_at(const Vector3 &p)
 {
-	set_look_direction(Vector3(p.x-position.x, p.y-position.y, p.z-position.z));
+	set_look_direction(p-position);
 }
 
 Vector3 Camera::project(const Vector4 &p) const
 {
-	float near_h = tan(fov/2)*clip_near;
-	float near_w = near_h*aspect;
+	float frustum_h = tan(fov/2);
+	float frustum_w = frustum_h*aspect;
 	float z_range = clip_far-clip_near;
 
-	float eye_x = matrix[0]*p.x+matrix[4]*p.y+matrix[8]*p.z+matrix[12]*p.w;
-	float eye_y = matrix[1]*p.x+matrix[5]*p.y+matrix[9]*p.z+matrix[13]*p.w;
-	float eye_z = matrix[2]*p.x+matrix[6]*p.y+matrix[10]*p.z+matrix[14]*p.w;
+	Vector4 eye = matrix*p;
+
+	return Vector3(eye.x/frustum_w/-eye.z, eye.y/frustum_h/-eye.z,
+		(clip_far+clip_near)/z_range+2*clip_far*clip_near/(eye.z*z_range));
+}
 
-	return Vector3(eye_x/near_w/-eye_z, eye_y/near_h/-eye_z,
-		(clip_far+clip_near)/z_range+2*clip_far*clip_near/(eye_z*z_range));
+Vector3 Camera::project(const Vector3 &p) const
+{
+	return project(Vector4(p.x, p.y, p.z, 1.0));
 }
 
 Vector4 Camera::unproject(const Vector4 &p) const
 {
-	float near_h = tan(fov/2)*clip_near;
-	float near_w = near_h*aspect;
+	float frustum_h = tan(fov/2);
+	float frustum_w = frustum_h*aspect;
 	float z_range = clip_far-clip_near;
 
 	float z = (2*clip_far*clip_near)/(p.z*z_range-(clip_far+clip_near))-matrix[14]*p.w;
-	float x = p.x*-z*near_w-matrix[12]*p.w;
-	float y = p.y*-z*near_h-matrix[13]*p.w;
+	float x = p.x*-z*frustum_w-matrix[12]*p.w;
+	float y = p.y*-z*frustum_h-matrix[13]*p.w;
 
 	return Vector4(matrix[0]*x+matrix[1]*y+matrix[2]*z,
 		matrix[4]*x+matrix[5]*y+matrix[6]*z,
@@ -108,38 +91,37 @@ Vector4 Camera::unproject(const Vector4 &p) const
 
 void Camera::apply() const
 {
-	float h = tan(fov/2)*2*clip_near;
-
-	matrix_mode(PROJECTION);
-	load_identity();
-	frustum_centered(h*aspect, h, clip_near, clip_far);
-
-	matrix_mode(MODELVIEW);
-	load_matrix(matrix);
+	MatrixStack::projection() = Matrix::perspective(fov, aspect, clip_near, clip_far);
+	MatrixStack::modelview() = matrix;
 }
 
 void Camera::compute_matrix()
 {
-	float x = look_dir.y*up_dir.z-look_dir.z*up_dir.y;
-	float y = look_dir.z*up_dir.x-look_dir.x*up_dir.z;
-	float z = look_dir.x*up_dir.y-look_dir.y*up_dir.x;
-	float len = sqrt(x*x+y*y+z*z);
-
-	matrix[0] = x/len;
-	matrix[4] = y/len;
-	matrix[8] = z/len;
-
-	matrix[1] = matrix[4]*look_dir.z-matrix[8]*look_dir.y;
-	matrix[5] = matrix[8]*look_dir.x-matrix[0]*look_dir.z;
-	matrix[9] = matrix[0]*look_dir.y-matrix[4]*look_dir.x;
-
-	matrix[2] = -look_dir.x;
-	matrix[6] = -look_dir.y;
-	matrix[10] = -look_dir.z;
-
-	matrix[12] = -position.x;
-	matrix[13] = -position.y;
-	matrix[14] = -position.z;
+	Vector3 right_dir = normalize(cross(look_dir, up_dir));
+	double mdata[16];
+
+	mdata[0] = right_dir.x;
+	mdata[4] = right_dir.y;
+	mdata[8] = right_dir.z;
+
+	mdata[1] = right_dir.y*look_dir.z-right_dir.z*look_dir.y;
+	mdata[5] = right_dir.z*look_dir.x-right_dir.x*look_dir.z;
+	mdata[9] = right_dir.x*look_dir.y-right_dir.y*look_dir.x;
+
+	mdata[2] = -look_dir.x;
+	mdata[6] = -look_dir.y;
+	mdata[10] = -look_dir.z;
+
+	mdata[12] = -position.x*mdata[0]-position.y*mdata[4]-position.z*mdata[8];
+	mdata[13] = -position.x*mdata[1]-position.y*mdata[5]-position.z*mdata[9];
+	mdata[14] = -position.x*mdata[2]-position.y*mdata[6]-position.z*mdata[10];
+
+	mdata[3] = 0;
+	mdata[7] = 0;
+	mdata[11] = 0;
+	mdata[15] = 1;
+
+	matrix = mdata;
 }
 
 } // namespace GL