X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Flighting.cpp;h=ce522ac06a11e77151a5c7fbe0967347674f2aa3;hp=2ba1edc5560e00889ecd31fa01592f121a68a993;hb=4fe225bf15048fcb7a678370f87d09f2de37031a;hpb=70663ae97d5b70a6b468e07dd7e73475a175dc9b

diff --git a/source/lighting.cpp b/source/lighting.cpp
index 2ba1edc5..ce522ac0 100644
--- a/source/lighting.cpp
+++ b/source/lighting.cpp
@@ -1,4 +1,7 @@
 #include <stdexcept>
+#include <cmath>
+#include <msp/gl/extensions/msp_legacy_features.h>
+#include "error.h"
 #include "light.h"
 #include "lighting.h"
 #include "lightunit.h"
@@ -13,7 +16,9 @@ namespace GL {
 Lighting::Lighting():
 	ambient(0.2),
 	sky_direction(0, 0, 1),
-	horizon_angle(Geometry::Angle<float>::zero())
+	horizon_angle(Geometry::Angle<float>::zero()),
+	fog_color(0.0f, 0.0f, 0.0f, 0.0f),
+	fog_density(0.0f)
 { }
 
 void Lighting::set_ambient(const Color &a)
@@ -36,11 +41,26 @@ void Lighting::set_horizon_angle(const Geometry::Angle<float> &a)
 	horizon_angle = a;
 }
 
-void Lighting::attach(unsigned i, const Light &l)
+void Lighting::set_fog_color(const Color &c)
+{
+	fog_color = c;
+}
+
+void Lighting::set_fog_density(float d)
+{
+	if(d<0)
+		throw invalid_argument("Lighting::set_fog_density");
+
+	fog_density = d;
+}
+
+void Lighting::set_fog_half_distance(float d)
 {
-	if(i>=LightUnit::get_n_units())
-		throw out_of_range("Lighting::attach");
+	set_fog_density(-log(pow(0.5, 1.0/d)));
+}
 
+void Lighting::attach(unsigned i, const Light &l)
+{
 	if(i>=lights.size())
 		lights.resize(i+1);
 
@@ -59,12 +79,19 @@ void Lighting::detach(unsigned i)
 		Light::unbind_from(i);
 }
 
+const Light *Lighting::get_attached_light(unsigned i) const
+{
+	return i<lights.size() ? lights[i] : 0;
+}
+
 void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix) const
 {
 	shdata.uniform("ambient_color", ambient);
 	shdata.uniform("sky_color", sky_color);
-	shdata.uniform("eye_sky_dir", Vector3(view_matrix*Vector4(sky_direction, 0.0f)));
+	shdata.uniform("eye_sky_dir", view_matrix.block<3, 3>(0, 0)*sky_direction);
 	shdata.uniform("horizon_limit", horizon_angle.radians());
+	shdata.uniform("fog_color", fog_color);
+	shdata.uniform("fog_density", fog_density);
 
 	for(unsigned i=0; i<lights.size(); ++i)
 		if(lights[i])
@@ -73,14 +100,37 @@ void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix
 
 void Lighting::bind() const
 {
+	static Require _req(MSP_legacy_features);
+	if(lights.size()>LightUnit::get_n_units())
+		throw invalid_operation("Lighting::bind");
+
+	const Lighting *old = current();
 	if(!set_current(this))
 		return;
 
 	enable(GL_LIGHTING);
 	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, &ambient.r);
 	for(unsigned i=0; i<lights.size(); ++i)
+	{
 		if(lights[i])
 			lights[i]->bind_to(i);
+		else
+			Light::unbind_from(i);
+	}
+
+	if(old)
+	{
+		for(unsigned i=lights.size(); i<old->lights.size(); ++i)
+			Light::unbind_from(i);
+	}
+
+	if(fog_density)
+	{
+		enable(GL_FOG);
+		glFogi(GL_FOG_MODE, GL_EXP);
+		glFogf(GL_FOG_DENSITY, fog_density);
+		glFogfv(GL_FOG_COLOR, &fog_color.r);
+	}
 }
 
 void Lighting::unbind()
@@ -94,6 +144,8 @@ void Lighting::unbind()
 			Light::unbind_from(i);
 
 	disable(GL_LIGHTING);
+	if(old->fog_density)
+		disable(GL_FOG);
 }
 
 } // namespace GL