101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
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#include "ogl.h"
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#include <Kore/Graphics3/Graphics.h>
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#include <Kore/Graphics3/Light.h>
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#include <Kore/Math/Core.h>
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using namespace Kore;
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// OpenGL man pages for "glLight" function:
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// see https://www.opengl.org/sdk/docs/man2/xhtml/glLight.xml
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LightImpl::LightImpl()
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: myType(DirectionalLight), myAmbient(0, 0, 0, 1), myDiffuse(1, 1, 1, 1), mySpecular(1, 1, 1, 1), myPositionOrDirection(0, 0, 1, 0),
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mySpotDirection(0, 0, 1), // default point in +Z direction
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mySpotExponent(0.0f), mySpotCutoff(180.0f), myConstAttn(1.0f), myLinearAttn(0.0f), myQuadricAttn(0.0f) {}
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LightImpl::~LightImpl() {}
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void Light::setType(LightType type) {
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// Set new light type
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myType = type;
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// Update position/directior vector
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myPositionOrDirection[3] = (myType == DirectionalLight ? 0.0f : 1.0f);
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}
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void Light::setColors(const vec4 &ambient, const vec4 &diffuse, const vec4 &specular) {
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// Store light colors
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myAmbient = ambient;
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myDiffuse = diffuse;
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mySpecular = specular;
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}
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void Light::setPosition(const vec3 &position) {
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// Store position point (x, y, z, 1)
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myPositionOrDirection = vec4(position, 1);
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}
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void Light::setDirection(const vec3 &direction) {
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if (myType == SpotLight) {
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// Store spot direction vector (x, y, z)
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mySpotDirection = direction;
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}
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else {
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// Store direction vector (x, y, z, 0)
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myPositionOrDirection = vec4(direction, 0);
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}
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}
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void Light::setSpot(float exponent, float cutoff) {
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mySpotExponent = exponent;
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mySpotCutoff = cutoff;
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}
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void Light::setAttenuation(float constAttn, float linearAttn, float quadricAttn) {
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myConstAttn = constAttn;
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myLinearAttn = linearAttn;
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myQuadricAttn = quadricAttn;
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}
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/*
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1
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GL Light Intensity = -----------------------------------
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constant + d*linear + d^2*quadratic
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*/
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void Light::setAttenuationRadius(float radius) {
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setAttenuation(1.0f, 1.0f / radius, 1.0f / radius);
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}
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void LightImpl::submitLightParamsToGL(GLenum lightID) const {
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// Submit colors
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glLightfv(lightID, GL_AMBIENT, myAmbient.values);
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glLightfv(lightID, GL_DIFFUSE, myDiffuse.values);
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glLightfv(lightID, GL_SPECULAR, mySpecular.values);
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// Submit attenuation
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glLightf(lightID, GL_CONSTANT_ATTENUATION, myConstAttn);
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glLightf(lightID, GL_LINEAR_ATTENUATION, myLinearAttn);
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glLightf(lightID, GL_QUADRATIC_ATTENUATION, myQuadricAttn);
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// Submit spot parameters
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glLightfv(lightID, GL_SPOT_DIRECTION, mySpotDirection.values);
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glLightf(lightID, GL_SPOT_EXPONENT, mySpotExponent);
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glLightf(lightID, GL_SPOT_CUTOFF, mySpotCutoff);
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}
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void LightImpl::submitLightTransformToGL(GLenum lightID) const {
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glLightfv(lightID, GL_POSITION, myPositionOrDirection.values);
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}
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Light::Light(LightType type) : LightImpl() {
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setType(type);
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}
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void Light::_set(int num) {
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GLenum lightID = GL_LIGHT0 + num;
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glEnable(lightID);
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submitLightParamsToGL(lightID);
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submitLightTransformToGL(lightID);
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}
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