X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fmaterials%2Flight.cpp;fp=source%2Fmaterials%2Flight.cpp;h=e910411f276e27ebd305f507513177787caebb25;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/materials/light.cpp b/source/materials/light.cpp
new file mode 100644
index 00000000..e910411f
--- /dev/null
+++ b/source/materials/light.cpp
@@ -0,0 +1,163 @@
+#include <stdexcept>
+#include <msp/strings/format.h>
+#include "light.h"
+#include "matrix.h"
+#include "misc.h"
+#include "programdata.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+Light::Light():
+	diffuse(1),
+	specular(1),
+	position(0, 0, 1, 0),
+	spot_dir(0, 0, -1),
+	spot_exp(0),
+	spot_cutoff(Geometry::Angle<float>::straight())
+{
+	attenuation[0] = 1;
+	attenuation[1] = 0;
+	attenuation[2] = 0;
+}
+
+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;
+}
+
+void Light::set_specular(const Color &c)
+{
+	specular = c;
+}
+
+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_matrix();
+}
+
+void Light::set_position(const Vector4 &p)
+{
+	position = p;
+	if(!position.w)
+		direction = normalize(-position.slice<3>(0));
+	update_matrix();
+}
+
+void Light::set_spot_direction(const Vector3 &d)
+{
+	spot_dir = normalize(d);
+	if(position.w)
+		direction = spot_dir;
+	update_matrix();
+}
+
+void Light::set_spot_exponent(float e)
+{
+	if(e<0)
+		throw invalid_argument("Light::set_spot_exponent");
+
+	spot_exp = e;
+}
+
+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;
+}
+
+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;
+	attenuation[1] = l;
+	attenuation[2] = q;
+}
+
+void Light::update_shader_data(ProgramData &shdata, const Matrix &view_matrix, unsigned i) const
+{
+	string base = format("light_sources[%d]", i);
+	shdata.uniform(base+".position", view_matrix*position);
+	shdata.uniform(base+".diffuse", diffuse);
+	shdata.uniform(base+".specular", specular);
+}
+
+
+Light::Loader::Loader(Light &l):
+	DataFile::ObjectLoader<Light>(l)
+{
+	add("attenuation", &Loader::attenuation);
+	add("diffuse", &Loader::diffuse);
+	add("position", &Loader::position);
+	add("specular", &Loader::specular);
+	add("spot_direction", &Loader::spot_direction);
+	add("spot_exponent", &Loader::spot_exponent);
+	add("spot_cutoff", &Loader::spot_cutoff);
+}
+
+void Light::Loader::attenuation(float c, float l, float q)
+{
+	obj.set_attenuation(c, l, q);
+}
+
+void Light::Loader::diffuse(float r, float g, float b)
+{
+	obj.set_diffuse(Color(r, g, b));
+}
+
+void Light::Loader::position(float x, float y, float z, float w)
+{
+	obj.set_position(Vector4(x, y, z, w));
+}
+
+void Light::Loader::specular(float r, float g, float b)
+{
+	obj.set_specular(Color(r, g, b));
+}
+
+void Light::Loader::spot_direction(float x, float y, float z)
+{
+	obj.set_spot_direction(Vector3(x, y, z));
+}
+
+void Light::Loader::spot_exponent(float e)
+{
+	obj.set_spot_exponent(e);
+}
+
+void Light::Loader::spot_cutoff(float c)
+{
+	obj.set_spot_cutoff(Geometry::Angle<float>::from_degrees(c));
+}
+
+} // namespace GL
+} // namespace Msp