83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
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# ifndef SR_LIGHT_H
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# define SR_LIGHT_H
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/** \file sr_light.h
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* Keeps light parameters
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*/
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# include "sr_vec.h"
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# include "sr_color.h"
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/*! \class SrLight sr_light.h
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\brief Keeps light parameters
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SrLight Keeps light parameters following the OpenGL specifications.
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Note however that this class only stores data and has no dependency on
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OpenGL functions. */
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class SrLight
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{ public :
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/*! Higher spot exponents result in a more focused light source. The default
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spot exponent is 0, resulting in uniform light distribution. Values must
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be in the range of [0,128]. */
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float spot_exponent;
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/*! The direction of the light in homogeneous object coordinates. The spot
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direction is transformed by the inverse of the modelview matrix when
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glLight is called (just as if it was a normal), and it is stored in
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eye coordinates. It is significant only when GL_SPOT_CUTOFF is not
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180, which it is by default. The default direction is (0,0,-1). */
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SrVec spot_direction;
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/*! Specifies the maximum spread angle. Only values in the range [0,90],
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and the special value 180, are accepted. If the angle between the
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direction of the light and the direction from the light to the vertex
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being lighted is greater than the spot cutoff angle, then the light
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is completely masked. Otherwise, its intensity is controlled by the
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spot exponent and the attenuation factors. The default spot cutoff
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is 180, resulting in uniform light distribution. */
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float spot_cutoff;
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/*! If the light is positional, rather than directional, its intensity
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is attenuated by the reciprocal of the sum of: the constant factor,
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the linear factor multiplied by the distance between the light and
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the vertex being lighted, and the quadratic factor multiplied by
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the square of the same distance. The default attenuation factors
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are cte=1, linear=0, quad=0, resulting in no attenuation. Only
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nonnegative values are accepted. */
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float constant_attenuation;
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float linear_attenuation; //!< See constant_attenuation.
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float quadratic_attenuation; //!< See constant_attenuation.
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SrColor ambient; //!< Default is black
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SrColor diffuse; //!< Default is white
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SrColor specular; //!< Default is black
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/*! The position is transformed by the modelview matrix when glLight is
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called (just as if it was a point), and it is stored in eye
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coordinates. If directional, diffuse and specular lighting calculations
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take the lights direction, but not its actual position, into account,
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and attenuation is disabled. Otherwise, diffuse and specular lighting
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calculations are based on the actual location of the light in eye
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coordinates, and attenuation is enabled. The default position is (0,0,1). */
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SrVec position;
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/*! When true means that the position w coord is 0, otherwise 1. Default is true. */
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bool directional;
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public :
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/*! Initialize the camera with the default parameters. */
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SrLight ();
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/*! Sets the default parameters. */
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void init ();
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};
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//================================ End of File =================================================
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# endif // SR_LIGHT_H
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