From ba7508239d78d99d5ed9edf73b66021682e3d0bb Mon Sep 17 00:00:00 2001
From: kungfooman <lama12345@gmail.com>
Date: Tue, 31 Oct 2017 08:10:10 +0100
Subject: [PATCH] vs2017 support

---
 shaders/metal.frag | 64 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/shaders/metal.frag b/shaders/metal.frag
index b539921..bf090fb 120000
--- a/shaders/metal.frag
+++ b/shaders/metal.frag
@@ -1 +1,63 @@
-diffuse.frag
\ No newline at end of file
+#version 130
+
+struct Light {
+	vec3 position;
+	float distance;
+	vec3 color;
+	float energy;
+	float specular;
+};
+
+uniform sampler2D diffuse;
+uniform sampler2D normalMap;
+uniform sampler2D specularMap;
+
+uniform Light lights[64];
+uniform int numLights;
+
+in vec3 pass_position;
+in vec2 pass_texCoord;
+in vec3 pass_normal;
+in vec3 pass_tangent;
+invariant in vec3 pass_viewerPos;
+invariant in mat3 pass_surf2world;
+in vec3 pass_worldPos;
+
+out vec4 out_Color;
+
+void main(void) {
+	// Normals
+	// Use MAD (Multiply And Add), like below
+	vec3 localCoords = (texture(normalMap, pass_texCoord).xyz * 2) - 1;
+	vec3 normal = normalize(pass_surf2world * localCoords);
+	vec3 viewDirection = normalize(pass_viewerPos - pass_worldPos);
+	float gloss = texture(specularMap, pass_texCoord).r * 255.0;
+	float normalization = (gloss + 8) * 0.125;
+	vec3 diffuseColor = texture(diffuse, pass_texCoord).rgb;
+
+	vec3 refl = .3 * diffuseColor;
+
+	for (int i = 0; i < numLights; ++i) {
+		// Calculate the vector from this pixels surface to the light source
+		vec3 lightDist = lights[i].position - pass_worldPos;
+		float lightLength = length(lightDist);
+		if (lightLength < lights[i].distance) {
+			// Diffuse reflection + normal map
+			float fAtt = max(0, 1 - sqrt(lightLength / lights[i].distance));
+			vec3 lightDir = lightDist/lightLength;
+			float fDiffuse = max(dot(normal, lightDir), 0);
+
+			// Specular reflection
+			vec3 halfDir = normalize(lightDir + viewDirection);
+
+			float fSpecular = normalization * pow(max(dot(halfDir, normal), 0), gloss) *
+			0.04 + 0.96*pow(1-dot(halfDir, lightDir), 5);
+
+			refl += fAtt * (
+				(diffuseColor + vec3(fSpecular)) * fDiffuse * lights[i].energy * lights[i].color
+			);
+		}
+	}
+
+	out_Color = vec4(refl, 1.0);
+}