73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
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/**
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@file GLight.h
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@maintainer Morgan McGuire, [email protected]
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@created 2003-11-12
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@edited 2006-02-08
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*/
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#ifndef G3D_GLIGHT_H
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#define G3D_GLIGHT_H
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#include "G3D/platform.h"
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#include "G3D/Vector4.h"
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#include "G3D/Vector3.h"
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#include "G3D/Color4.h"
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namespace G3D {
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/**
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A light representation that closely follows the OpenGL light format.
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*/
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class GLight {
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public:
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/** World space position (for a directional light, w = 0 */
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Vector4 position;
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/** Direction in which the light faces, if a spot light. This is the "look vector" of the light source. */
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Vector3 spotDirection;
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/** In <B>degrees</B>. 180 = no cutoff (point/dir) >90 = spot light */
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float spotCutoff;
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/** Constant, linear, quadratic */
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float attenuation[3];
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/** May be outside the range [0, 1] */
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Color3 color;
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/** If false, this light is ignored */
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bool enabled;
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/** If false, this light does not create specular highlights (useful when using negative lights). */
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bool specular;
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/** If false, this light does not create diffuse illumination (useful when rendering a specular-only pass). */
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bool diffuse;
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GLight();
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/** @param toLight will be normalized */
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static GLight directional(const Vector3& toLight, const Color3& color, bool specular = true, bool diffuse = true);
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static GLight point(const Vector3& pos, const Color3& color, float constAtt = 1, float linAtt = 0, float quadAtt = 0.5f, bool specular = true, bool diffuse = true);
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/** @param pointDirection Will be normalized. Points in the direction that light propagates.
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@param cutOffAngleDegrees Must be on the range [0, 90]. This is the angle from the point direction
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to the edge of the light cone.
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*/
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static GLight spot(const Vector3& pos, const Vector3& pointDirection, float cutOffAngleDegrees, const Color3& color, float constAtt = 1, float linAtt = 0, float quadAtt = 0, bool specular = true, bool diffuse = true);
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/** Returns the sphere within which this light has some noticable effect. May be infinite.
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@param cutoff The value at which the light intensity is considered negligible. */
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class Sphere effectSphere(float cutoff = 30.0f / 255) const;
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bool operator==(const GLight& other) const;
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bool operator!=(const GLight& other) const;
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};
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} // namespace
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#endif
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