From accfd0b069897c1a07b7ee7dd1f35a345fb76c30 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Mon, 22 Oct 2018 01:47:07 +0300
Subject: main shader: Use an interface block for neatness

---
 shaders/main/frag.glsl | 20 +++++++++++---------
 shaders/main/vert.glsl | 18 ++++++++++--------
 2 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/shaders/main/frag.glsl b/shaders/main/frag.glsl
index 8aa9a6a..f6ed7c3 100644
--- a/shaders/main/frag.glsl
+++ b/shaders/main/frag.glsl
@@ -2,25 +2,27 @@
  * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
  * SPDX-License-Identifier: MIT
  */
-in vec3 fnorm;
-in vec3 fpos;
-in vec2 fuv;
-in vec3 lipos;
+in iface {
+	vec3 norm;
+	vec3 pos;
+	vec2 uv;
+	vec3 lipos;
+} i;
 
 void main()
 {
-	vec3 fdiff = vec3(texture(tdiff, fuv));
-	vec3 fspec = vec3(texture(tspec, fuv));
+	vec3 fdiff = vec3(texture(tdiff, i.uv));
+	vec3 fspec = vec3(texture(tspec, i.uv));
 	vec3 lico = vec3(1.0, 1.0, 1.0);
 
 	vec3 amb = vec3(0.1, 0.1, 0.1);
 
-	vec3 norm = normalize(fnorm);
-	vec3 lidir = normalize(lipos - fpos);
+	vec3 norm = normalize(i.norm);
+	vec3 lidir = normalize(i.lipos - i.pos);
 	vec3 diff = max(dot(norm, lidir), 0.0) * fdiff;
 
 	float specen = max(sign(dot(lidir, norm)), 0.0);
-	vec3 vwdir = normalize(-fpos);
+	vec3 vwdir = normalize(-i.pos);
 	vec3 mid = normalize(lidir + vwdir);
 
 	vec3 spec = pow(max(dot(norm, mid), 0.0), 256) * specen * fspec;
diff --git a/shaders/main/vert.glsl b/shaders/main/vert.glsl
index f710067..3b145e3 100644
--- a/shaders/main/vert.glsl
+++ b/shaders/main/vert.glsl
@@ -2,17 +2,19 @@
  * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
  * SPDX-License-Identifier: MIT
  */
-out vec3 fnorm;
-out vec3 fpos;
-out vec2 fuv;
-out vec3 lipos;
+out iface {
+	vec3 norm;
+	vec3 pos;
+	vec2 uv;
+	vec3 lipos;
+} o;
 
 void main()
 {
 	gl_Position = proj * view * model * vec4(pos, 1.0);
-	fpos = vec3(view * model * vec4(pos, 1.0));
-	fuv = uv;
+	o.pos = vec3(view * model * vec4(pos, 1.0));
+	o.uv = uv;
 	// TODO: Try to work out how to only do this ONCE in C or see if it matters
-	fnorm = mat3(transpose(inverse(view * model))) *norm;
-	lipos = vec3(view * vec4(light, 1.0));
+	o.norm = mat3(transpose(inverse(view * model))) * norm;
+	o.lipos = vec3(view * vec4(light, 1.0));
 }
-- 
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