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update spotlight code (Harry Tuttle)

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This commit is contained in:
Ian Curtis 2017-10-05 18:49:08 +00:00
parent cee468b2bc
commit 43cf6b3bbf
2 changed files with 50 additions and 42 deletions
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4
Src/Graphics/New3D/New3D.cpp
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@ -801,10 +801,6 @@ void CNew3D::RenderViewport(UINT32 addr)
vp->spotRange[0] = 1.0f / (*(float *)&vpnode[0x21]); // spotlight start
vp->spotRange[1] = *(float *)&vpnode[0x1F]; // spotlight extent
// Star Wars Trilogy needs this
vp->spotRange[0] = std::min(vp->spotRange[0], std::numeric_limits<float>::max());
vp->spotRange[0] = std::max(vp->spotRange[0], std::numeric_limits<float>::lowest());
vp->spotColor[0] = color[spotColorIdx][0]; // spotlight color
vp->spotColor[1] = color[spotColorIdx][1];
vp->spotColor[2] = color[spotColorIdx][2];

48
Src/Graphics/New3D/R3DShader.cpp
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@ -167,6 +167,34 @@ void main()
ellipse = 1.0 - ellipse; // invert
ellipse = max(0.0, ellipse); // clamp
// Compute spotlight and apply lighting
float enable, absExtent, d, inv_r, range;
// start of spotlight
enable = step(spotRange.x, -fsViewVertex.z);
if (spotRange.y == 0.0) {
range = 0.0;
}
else {
absExtent = abs(spotRange.y);
d = spotRange.x + absExtent + fsViewVertex.z;
d = min(d, 0.0);
// slope of decay function
inv_r = 1.0 / (1.0 + absExtent);
// inverse-linear falloff
// Reference: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
// y = 1 / (d/r + 1)^2
range = 1.0 / pow(d * inv_r - 1.0, 2.0);
range *= enable;
}
float lobeEffect = range * ellipse;
float lobeFogEffect = enable * ellipse;
if (lightEnabled) {
vec3 lightIntensity;
vec3 sunVector; // sun lighting vector (as reflecting away from vertex)
@ -199,22 +227,6 @@ void main()
lightIntensity = min(lightIntensity,1.0);
}
// Compute spotlight and apply lighting
float enable, range, d;
float inv_r = 1.0 / spotEllipse.z; // slope of decay function
d = spotRange.x + spotRange.y + fsViewVertex.z;
enable = step(spotRange.x + min(spotRange.y, 0.0), -fsViewVertex.z);
// inverse-linear falloff
// Reference: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
// y = 1 / (d/r + 1)^2
range = 1.0 / pow(min(0.0, d * inv_r) - 1.0, 2.0);
range = clamp(range, 0.0, 1.0);
range *= enable;
float lobeEffect = range * ellipse;
lightIntensity.rgb += spotColor*lobeEffect;
finalData.rgb *= lightIntensity;
@ -253,10 +265,10 @@ void main()
finalData.rgb = min(finalData.rgb, vec3(1.0));
// Spotlight on fog
vec3 lSpotFogColor = spotFogColor * ellipse * fogColour.rgb;
vec3 lSpotFogColor = spotFogColor * fogAttenuation * fogColour.rgb * lobeFogEffect;
// Fog & spotlight applied
finalData.rgb = mix(finalData.rgb, lSpotFogColor * fogAttenuation + fogData.rgb, fogData.a);
finalData.rgb = mix(finalData.rgb, fogData.rgb + lSpotFogColor, fogData.a);
gl_FragColor = finalData;
}