From 8925bd867e1a8791801698b1abaec4a46180656e Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Thu, 12 Aug 2021 20:25:25 -0400
Subject: graphics: Always use normal/ambient/etc. maps.

If models don't specify their own textures, use noop textures as
appropriate.
---
 data/shaders/phong-frag.glsl | 62 +++++++++++++++-----------------------------
 1 file changed, 21 insertions(+), 41 deletions(-)

(limited to 'data/shaders/phong-frag.glsl')

diff --git a/data/shaders/phong-frag.glsl b/data/shaders/phong-frag.glsl
index 363c4e7..0beb75b 100644
--- a/data/shaders/phong-frag.glsl
+++ b/data/shaders/phong-frag.glsl
@@ -2,13 +2,9 @@
 
 struct Material {
   vec3 ambient;
-  bool useAmbientMap;
   vec3 diffuse;
-  bool useDiffuseMap;
   vec3 specular;
-  bool useSpecularMap;
   float shininess;
-  bool useNormalMap;
 };
 
 struct Light {
@@ -100,53 +96,37 @@ vec3 lightRadiance(Light light, vec3 direction) {
 }
 
 vec3 materialAmbient() {
-  if(material.useAmbientMap) {
-    return texture(ambientMap, fragTex).rgb;
-  } else {
-    return material.ambient;
-  }
+  return texture(ambientMap, fragTex).rgb * material.ambient;
 }
 
 vec3 materialDiffuse() {
-  if(material.useDiffuseMap) {
-    vec4 color = texture(diffuseMap, fragTex);
-    // discard transparent fragments.
-    if(color.a == 0.0) {
-      discard;
-    }
-    return color.rgb;
-  } else {
-    return material.diffuse;
+  vec4 color = texture(diffuseMap, fragTex);
+  // discard transparent fragments.
+  if(color.a == 0.0) {
+    discard;
   }
+  return color.rgb * material.diffuse;
 }
 
 vec3 materialSpecular() {
-  if(material.useSpecularMap) {
-    return texture(specularMap, fragTex).rgb;
-  } else {
-    return material.specular;
-  }
+  return texture(specularMap, fragTex).rgb * material.specular;
 }
 
 vec3 materialNormal() {
-  if(material.useNormalMap) {
-    // Compute tangent space using fragment data rather than relying
-    // on tangent attributes.  See:
-    // http://www.thetenthplanet.de/archives/1180
-    vec3 tangentNormal = normalize(texture(normalMap, fragTex).xyz * 2.0 - 1.0);
-    vec3 q1 = dFdx(fragWorldPos);
-    vec3 q2 = dFdy(fragWorldPos);
-    vec2 st1 = dFdx(fragTex);
-    vec2 st2 = dFdy(fragTex);
-    vec3 N = normalize(fragNorm);
-    vec3 T = normalize(q1 * st2.t - q2 * st1.t);
-    vec3 B = -normalize(cross(N, T));
-    mat3 TBN = mat3(T, B, N);
-
-    return normalize(TBN * tangentNormal);
-  } else {
-    return normalize(fragNorm);
-  }
+  // Compute tangent space using fragment data rather than relying
+  // on tangent attributes.  See:
+  // http://www.thetenthplanet.de/archives/1180
+  vec3 tangentNormal = normalize(texture(normalMap, fragTex).xyz * 2.0 - 1.0);
+  vec3 q1 = dFdx(fragWorldPos);
+  vec3 q2 = dFdy(fragWorldPos);
+  vec2 st1 = dFdx(fragTex);
+  vec2 st2 = dFdy(fragTex);
+  vec3 N = normalize(fragNorm);
+  vec3 T = normalize(q1 * st2.t - q2 * st1.t);
+  vec3 B = -normalize(cross(N, T));
+  mat3 TBN = mat3(T, B, N);
+
+  return normalize(TBN * tangentNormal);
 }
 
 void main() {
-- 
cgit v1.2.3