X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flight.cpp;h=aeb17c5be4a604b79235ade3cd2423d34e83dfb0;hb=0e130c02d5e89397ac4963676534e0005359c61e;hp=a3b3d014c0a51a16762c7a82285f4a6a8960247c;hpb=9dc2c20e8c7ac91d932b12492591b65786e24b0f;p=libs%2Fgl.git

diff --git a/source/light.cpp b/source/light.cpp
index a3b3d014..aeb17c5b 100644
--- a/source/light.cpp
+++ b/source/light.cpp
@@ -18,7 +18,7 @@ Light::Light():
 	position(0, 0, 1, 0),
 	spot_dir(0, 0, -1),
 	spot_exp(0),
-	spot_cutoff(180)
+	spot_cutoff(Geometry::Angle<float>::straight())
 {
 	attenuation[0] = 1;
 	attenuation[1] = 0;
@@ -54,7 +54,7 @@ void Light::update_parameter(int mask, int index) const
 	if(mask&SPOT_EXP)
 		glLightf(l, GL_SPOT_EXPONENT, spot_exp);
 	if(mask&SPOT_CUTOFF)
-		glLightf(l, GL_SPOT_CUTOFF, spot_cutoff);
+		glLightf(l, GL_SPOT_CUTOFF, spot_cutoff.degrees());
 	if(mask&ATTENUATION)
 	{
 		glLightf(l, GL_CONSTANT_ATTENUATION, attenuation[0]);
@@ -63,6 +63,23 @@ void Light::update_parameter(int mask, int index) const
 	}
 }
 
+void Light::update_matrix()
+{
+	Vector3 up_dir;
+	if(20*abs(direction.z)>abs(direction.x)+abs(direction.y))
+		up_dir.y = 1;
+	else
+		up_dir.z = 1;
+	Vector3 right_dir = normalize(cross(direction, up_dir));
+
+	Vector4 columns[4];
+	columns[0] = compose(right_dir, 0.0f);
+	columns[1] = compose(cross(right_dir, direction), 0.0f);
+	columns[2] = compose(-direction, 0.0f);
+	columns[3] = position;
+	matrix = Matrix::from_columns(columns);
+}
+
 void Light::set_diffuse(const Color &c)
 {
 	diffuse = c;
@@ -75,30 +92,62 @@ void Light::set_specular(const Color &c)
 	update_parameter(SPECULAR);
 }
 
+void Light::set_matrix(const Matrix &m)
+{
+	Placeable::set_matrix(m);
+	position = matrix.column(3);
+	spot_dir = normalize(-matrix.column(2).slice<3>(0));
+	direction = (position.w ? spot_dir : normalize(-position.slice<3>(0)));
+	update_parameter(POSITION|SPOT_DIR);
+	update_matrix();
+}
+
 void Light::set_position(const Vector4 &p)
 {
 	position = p;
 	update_parameter(POSITION);
+	if(!position.w)
+		direction = normalize(-position.slice<3>(0));
+	update_matrix();
 }
 
 void Light::set_spot_direction(const Vector3 &d)
 {
-	spot_dir = d;
+	spot_dir = normalize(d);
+	if(position.w)
+		direction = spot_dir;
 	update_parameter(SPOT_DIR);
+	update_matrix();
 }
 
 void Light::set_spot_exponent(float e)
 {
+	if(e<0)
+		throw invalid_argument("Light::set_spot_exponent");
+
 	spot_exp = e;
 	update_parameter(SPOT_EXP);
 }
 
 void Light::set_spot_cutoff(float c)
 {
+	set_spot_cutoff(Geometry::Angle<float>::from_degrees(c));
+}
+
+void Light::set_spot_cutoff(const Geometry::Angle<float> &c)
+{
+	if(c<Geometry::Angle<float>::zero() || (c>Geometry::Angle<float>::right() && c!=Geometry::Angle<float>::straight()))
+		throw invalid_argument("Light::set_spot_cutoff");
+
 	spot_cutoff = c;
 	update_parameter(SPOT_CUTOFF);
 }
 
+void Light::disable_spot_cutoff()
+{
+	set_spot_cutoff(Geometry::Angle<float>::straight());
+}
+
 void Light::set_attenuation(float c, float l, float q)
 {
 	attenuation[0] = c;