From ffdaa93edf5eeaf9db7dc17e51554a77dd9d596d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 19 Nov 2022 15:04:30 +0000
Subject: Separate out the illumation of the scene

---
 gfx/gl/shaders/directionalLight.fs | 18 +++++++++++++
 gfx/gl/shaders/lightingShader.fs   | 52 +++-----------------------------------
 2 files changed, 22 insertions(+), 48 deletions(-)
 create mode 100644 gfx/gl/shaders/directionalLight.fs

(limited to 'gfx')

diff --git a/gfx/gl/shaders/directionalLight.fs b/gfx/gl/shaders/directionalLight.fs
new file mode 100644
index 0000000..7562f96
--- /dev/null
+++ b/gfx/gl/shaders/directionalLight.fs
@@ -0,0 +1,18 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+out vec3 FragColor;
+
+in vec2 TexCoords;
+
+layout(binding = 1) uniform sampler2D gNormal;
+
+uniform vec3 lightDirection;
+uniform vec3 lightColour;
+
+void
+main()
+{
+	const vec3 Normal = texture(gNormal, TexCoords).rgb;
+	FragColor = dot(-lightDirection, Normal) * lightColour;
+}
diff --git a/gfx/gl/shaders/lightingShader.fs b/gfx/gl/shaders/lightingShader.fs
index b0ca20a..4646b75 100644
--- a/gfx/gl/shaders/lightingShader.fs
+++ b/gfx/gl/shaders/lightingShader.fs
@@ -5,58 +5,14 @@ out vec3 FragColor;
 
 in vec2 TexCoords;
 
-layout(binding = 0) uniform sampler2D gPosition;
-layout(binding = 1) uniform sampler2D gNormal;
 layout(binding = 2) uniform sampler2D gAlbedoSpec;
-
-// struct Light {
-// vec3 Position;
-// vec3 Color;
-
-// float Linear;
-// float Quadratic;
-// float Radius;
-//};
-// const int NR_LIGHTS_MAX = 12;
-// uniform Light lights[NR_LIGHTS_MAX];
-// uniform vec3 viewPos;
-
-uniform vec3 lightDirection = normalize(vec3(1, 0, -1));
-uniform vec3 lightColor = vec3(0.6, 0.6, 0.6);
-uniform vec3 ambientColor = vec3(0.5, 0.5, 0.5);
+layout(binding = 3) uniform sampler2D gIllumination;
 
 void
 main()
 {
-	// retrieve data from gbuffer
-	// const vec3 FragPos = texture(gPosition, TexCoords).rgb;
-	const vec3 Normal = texture(gNormal, TexCoords).rgb;
-	const vec3 Diffuse = texture(gAlbedoSpec, TexCoords).rgb;
-	// float Specular = texture(gAlbedoSpec, TexCoords).a;
-
-	// then calculate lighting as usual
-	// vec3 lighting = Diffuse;
-	const vec3 lighting = ambientColor + clamp((dot(-lightDirection, Normal) * lightColor), 0, 0.5);
-	// vec3 viewDir = normalize(viewPos - FragPos);
-	// for (int i = 0; i < NR_LIGHTS_MAX; ++i) {
-	//  calculate distance between light source and current fragment
-	// float distance = length(lights[i].Position - FragPos);
-	// if (distance < lights[i].Radius) {
-	//  diffuse
-	// vec3 lightDir = normalize(lights[i].Position - FragPos);
-	// vec3 diffuse = max(dot(Normal, lightDir), 0.0) * Diffuse * lights[i].Color;
-	//  specular
-	// vec3 halfwayDir = normalize(lightDir + viewDir);
-	// float spec = pow(max(dot(Normal, halfwayDir), 0.0), 16.0);
-	// vec3 specular = lights[i].Color * spec * Specular;
-	//  attenuation
-	// float attenuation = 1.0 / (1.0 + lights[i].Linear * distance + lights[i].Quadratic * distance * distance);
-	// diffuse *= attenuation;
-	// specular *= attenuation;
-	// lighting += diffuse + specular;
-	//}
-	//}
-	// FragColor = vec4(lighting, 1.0);
+	const vec3 Albedo = texture(gAlbedoSpec, TexCoords).rgb;
+	const vec3 Illumination = texture(gIllumination, TexCoords).rgb;
 
-	FragColor = vec3(Diffuse * lighting);
+	FragColor = Albedo * Illumination;
 }
-- 
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