From 0767eec826746c196f7fd161ff3981946ee444fc Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Mon, 30 Dec 2024 04:07:44 +0300
Subject: [PATCH] Simplify varyings

---
 src/bin/minitracer/trace.wgsl | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/bin/minitracer/trace.wgsl b/src/bin/minitracer/trace.wgsl
index 33571cc..5b24b85 100644
--- a/src/bin/minitracer/trace.wgsl
+++ b/src/bin/minitracer/trace.wgsl
@@ -20,8 +20,7 @@ struct Vertex {
 }
 
 struct Varying {
-	@location(0) eye: vec3f,
-	@location(1) world: vec3f,
+	@location(0) dir: vec3f,
 	@builtin(position) screen: vec4f,
 }
 
@@ -32,7 +31,7 @@ var<push_constant> params: Params;
 
 @vertex
 fn on_vertex(in: Vertex) -> Varying {
-	return Varying(params.eye, params.eye + params.view * vec3(1.0, in.screen), vec4(in.screen, 0.0, 1.0));
+	return Varying(params.view * vec3(1.0, in.screen), vec4(in.screen, 0.0, 1.0));
 }
 
 @fragment
@@ -68,10 +67,10 @@ fn trace_fragment(in: Varying) -> vec4f {
 
 	var result = vec4(0.0, 0.0, 0.0, 0.0);
 	var color = vec3(1.0, 1.0, 1.0);
-	pos = in.eye;
+	pos = params.eye;
 	let off_px = vec2(rand_float(), rand_float()) - .5;
-	let off_w = mat2x3(dpdx(in.world), dpdy(in.world));
-	ray = normalize(in.world + off_w * off_px - in.eye);
+	let off_w = mat2x3(dpdx(in.dir), dpdy(in.dir));
+	ray = normalize(in.dir + off_w * off_px);
 
 	for (var k = 0; k < params.max_reflections; k++) {
 		var sphere = -1;