X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Flight.h;h=31dc3c0db709285c7f918820752b9c668d2ddcbf;hp=cf9ab8a1acb69cdbec2cdfead4ad2580e66f40e7;hb=42c1534d95e1551c37e64a1dae288e8b75e8d8ba;hpb=48b1ab4fff00c49cc15d70a354eedb3d7a2f3e87

diff --git a/source/light.h b/source/light.h
index cf9ab8a1..31dc3c0d 100644
--- a/source/light.h
+++ b/source/light.h
@@ -2,42 +2,127 @@
 #define MSP_GL_LIGHT_H_
 
 #include <vector>
+#include <msp/datafile/objectloader.h>
 #include "color.h"
-#include "vector.h"
+#include "placeable.h"
 
 namespace Msp {
 namespace GL {
 
-class Light
+class Matrix;
+class ProgramData;
+
+/**
+Stores properties of a single light source.  Lights can be directional, point
+lights or spotlights.  No explicit type parameter is provided; rather the
+other parameters determine what kind of light it is.  If the fourth component
+of position is zero, it's a directional light.  Otherwise, if the spot cutoff
+is not 180 degrees, it's a spotlight.  Otherwise it's an omnidirectional point
+light.
+
+Lights are usually grouped with a Lighting object, which can be used in a
+Pipeline::Pass.
+
+Lights do not cast shadows by themselves.  See ShadowMap for that.
+*/
+class Light: public Placeable
 {
+public:
+	class Loader: public DataFile::ObjectLoader<Light>
+	{
+	public:
+		Loader(Light &);
+
+	private:
+		void attenuation(float, float, float);
+		void diffuse(float, float, float);
+		void position(float, float, float, float);
+		void specular(float, float, float);
+		void spot_direction(float, float, float);
+		void spot_exponent(float);
+		void spot_cutoff(float);
+	};
+
 private:
+	enum ParameterMask
+	{
+		DIFFUSE = 1,
+		SPECULAR = 2,
+		POSITION = 4,
+		SPOT_DIR = 8,
+		SPOT_EXP = 16,
+		SPOT_CUTOFF = 32,
+		ATTENUATION = 64
+	};
+
 	Color diffuse;
 	Color specular;
 	Vector4 position;
 	Vector3 spot_dir;
+	Vector3 direction;
 	float spot_exp;
-	float spot_cutoff;
+	Geometry::Angle<float> spot_cutoff;
 	float attenuation[3];
 
 public:
 	Light();
+	~Light();
+
+private:
+	void update_parameter(int, int = -1) const;
+	void update_matrix();
 
+public:
+	/** Sets the diffuse (direction-independent) color of the Light.  Provided
+	to shaders with the name light_sources[i].diffuse. */
 	void set_diffuse(const Color &c);
+
+	/** Sets the specular (direction-dependent) color of the Light.  Provided to
+	shaders with the name light_sources[i].specular. */
 	void set_specular(const Color &c);
+
 	const Color &get_diffuse() const { return diffuse; }
 	const Color &get_specular() const { return specular; }
 
+	/** Sets the postion and orientation of the Light from a matrix.  Negative Z
+	axis is used as the spot direction, other axes are ignored. */
+	virtual void set_matrix(const Matrix &);
+
+	/** Sets the position of the Light.  For a directional light, set the xyz
+	components to a vector pointing towards the light and the w component to 0. */
 	void set_position(const Vector4 &);
+
 	const Vector4 &get_position() const { return position; }
+
+	/** Sets the direction of a spotlight.  Has no effect if spotlight cutoff is
+	not set. */
 	void set_spot_direction(const Vector3 &);
+
+	/** Sets the angular falloff exponent of the spotlight.  Must be >= 0. */
 	void set_spot_exponent(float);
+
+	/// Deprecated.
 	void set_spot_cutoff(float);
+
+	/** Sets the cutoff angle of a spotlight.  Beyond this angle from its axis
+	the spotlight provides no illumination.  Must be between 0 and 90 degrees,
+	or exactly 180 degrees to indicate a non-spotlight. */
+	void set_spot_cutoff(const Geometry::Angle<float> &);
+
+	/** Disables spotlight, reverting to an omnidirectional point light.
+	Equivalent to setting the spot cutoff to 180 degrees. */
+	void disable_spot_cutoff();
+
 	const Vector3 &get_spot_direction() const { return spot_dir; }
 	float get_spot_exponent() const { return spot_exp; }
-	float get_spot_cutoff() const { return spot_cutoff; }
+	const Geometry::Angle<float> &get_spot_cutoff() const { return spot_cutoff; }
 	void set_attenuation(float, float, float);
 	const float *get_attenuation() const { return attenuation; }
 
+	/** Updates a ProgramData object with the uniforms for the Light.  A view
+	matrix and light source index must be passed in. */
+	void update_shader_data(ProgramData &, const Matrix &, unsigned) const;
+
 	void bind() const { return bind_to(0); }
 	void bind_to(unsigned) const;