From 213c3a4e99c3085ee89fda550897213abbc888ad Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Mon, 10 Jun 2024 15:59:57 +0000
Subject: add spotlight params and a light color shading routine. other things.

among these other things are clamping the color
channels to [0,1] internally, and adding a
modulation function for mixing colors/points.
---
 graphics.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'graphics.h')

diff --git a/graphics.h b/graphics.h
index b7cfdce..b30dd9f 100644
--- a/graphics.h
+++ b/graphics.h
@@ -104,8 +104,12 @@ struct Vertex
 struct LightSource
 {
 	Point3 p;
+	Point3 dir;
 	Color c;
 	int type;
+	/* spotlights */
+	double θu;	/* umbra angle. anything beyond is unlit */
+	double θp;	/* penumbra angle. anything within is fully lit */
 };
 
 struct Material
@@ -330,11 +334,14 @@ Color cubemaptexture(Cubemap*, Point3, Color(*)(Memimage*, Point2));
 /* util */
 double fmin(double, double);
 double fmax(double, double);
+Point2 modulapt2(Point2, Point2);
+Point3 modulapt3(Point3, Point3);
 Memimage *rgb(ulong);
 
 /* shadeop */
 double sign(double);
 double step(double, double);
 double smoothstep(double, double, double);
+Color getlightcolor(LightSource*, Point3);
 
 extern Rectangle UR;	/* unit rectangle */
-- 
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