From c7b59a5b66edd96024495b7d94641b9a857a97ef Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Tue, 11 May 2021 09:09:46 -0400
Subject: graphics: model: Add really rough sketch of PBR lighting model.

---
 data/shaders/pbr-vert.glsl | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'data/shaders/pbr-vert.glsl')

diff --git a/data/shaders/pbr-vert.glsl b/data/shaders/pbr-vert.glsl
index f622988..530c564 100644
--- a/data/shaders/pbr-vert.glsl
+++ b/data/shaders/pbr-vert.glsl
@@ -2,11 +2,13 @@
 
 #ifdef GLSL330
 layout (location = 0) in vec3 position;
-layout (location = 1) in vec2 texcoord0;
-layout (location = 2) in vec2 texcoord1;
-layout (location = 3) in vec4 color0;
+layout (location = 1) in vec3 normal;
+layout (location = 2) in vec2 texcoord0;
+layout (location = 3) in vec2 texcoord1;
+layout (location = 4) in vec4 color0;
 #elif defined(GLSL130)
 in vec3 position;
+in vec3 normal;
 in vec2 texcoord0;
 in vec2 texcoord1;
 in vec4 color0;
@@ -18,10 +20,16 @@ attribute vec4 color0;
 #endif
 
 #ifdef GLSL120
+varying vec3 fragWorldPos;
+varying vec3 fragCamPos;
+varying vec3 fragNormal;
 varying vec2 fragTexcoord0;
 varying vec2 fragTexcoord1;
 varying vec4 fragColor0;
 #else
+out vec3 fragWorldPos;
+out vec3 fragCamPos;
+out vec3 fragNormal;
 out vec2 fragTexcoord0;
 out vec2 fragTexcoord1;
 out vec4 fragColor0;
@@ -32,6 +40,9 @@ uniform mat4 view;
 uniform mat4 projection;
 
 void main(void) {
+  fragWorldPos = (model * vec4(position.xyz, 1.0)).xyz;
+  fragCamPos = (view * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
+  fragNormal = normal;
   fragTexcoord0 = texcoord0;
   fragTexcoord1 = texcoord1;
   fragColor0 = color0;
-- 
cgit v1.2.3