X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Flighting.cpp;fp=source%2Flighting.cpp;h=5cda4f4c6a4e005a5ad71c22427ddc0c5d0d69c7;hb=bbd21944fae06f134625b2f5595c3aab36c3aa9e;hp=a927d622fade9b0c81a916f51ef31bce079bf825;hpb=574abfb7aeb77436714ea06bf82713cb3d85204e;p=libs%2Fgl.git

diff --git a/source/lighting.cpp b/source/lighting.cpp
index a927d622..5cda4f4c 100644
--- a/source/lighting.cpp
+++ b/source/lighting.cpp
@@ -1,4 +1,5 @@
 #include <stdexcept>
+#include <cmath>
 #include <msp/gl/extensions/msp_legacy_features.h>
 #include "error.h"
 #include "light.h"
@@ -15,7 +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)
@@ -38,6 +41,24 @@ void Lighting::set_horizon_angle(const Geometry::Angle<float> &a)
 	horizon_angle = a;
 }
 
+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)
+{
+	set_fog_density(-log(pow(0.5, 1.0/d)));
+}
+
 void Lighting::attach(unsigned i, const Light &l)
 {
 	if(i>=lights.size())
@@ -69,6 +90,8 @@ void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix
 	shdata.uniform("sky_color", sky_color);
 	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])
@@ -89,6 +112,14 @@ void Lighting::bind() const
 	for(unsigned i=0; i<lights.size(); ++i)
 		if(lights[i])
 			lights[i]->bind_to(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()
@@ -102,6 +133,8 @@ void Lighting::unbind()
 			Light::unbind_from(i);
 
 	disable(GL_LIGHTING);
+	if(old->fog_density)
+		disable(GL_FOG);
 }
 
 } // namespace GL