From 117c310e8baf60aa5f052214e1747b5846f34b4e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 14 Feb 2026 19:18:12 -0800
Subject: Directional light

---
 src/swgfx.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/swgfx.c b/src/swgfx.c
index 33b453d..1901057 100644
--- a/src/swgfx.c
+++ b/src/swgfx.c
@@ -1011,7 +1011,7 @@ void sgAmbient(swgfx* gfx, sgColour3 ambient) {
     if (depth != DepthClearValue) {
       const sgColour3* albedo = &gfx->albedo[i];
       sgColour4* colour       = &gfx->colour[i];
-      *colour = Vec4FromVec3(mul3(*albedo, ambient), 1.f);
+      colour->rgb = add3(colour->rgb, mul3(*albedo, ambient));
     }
   }
 }
@@ -1027,10 +1027,7 @@ void sgDirectional(swgfx* gfx, sgColour3 lightColour, sgVec3 direction) {
       const sgVec3*  normal   = &gfx->normals[i];
       const R        NdotL    = fmaxf(0.f, dot3(*normal, L));
       sgColour4* colour       = &gfx->colour[i];
-      // TODO: Here and in sgAmbient() we need to accumulate colour, so this
-      //  should be +=. But colour also needs to be sgVec4, not sgPixel. We
-      //  should transform sgVec4 to sgPixel colour on sgPresent() instead.
-      *colour = Vec4FromVec3(scale3(mul3(*albedo, lightColour), NdotL), 1.f);
+      colour->rgb = add3(colour->rgb, scale3(mul3(*albedo, lightColour), NdotL));
     }
   }
 }
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