ambient light dedicated variable in shader

assets/Shaders/lib/lights.fs

@@ -1,34 +1,37 @@
 //uncomment if working on this library file:
 //#version 450 core
+#extension GL_ARB_shading_language_include : require
+#include "./material.fs"
 
 /**
-Maximum number of point lights
+  * Maximum number of point lights
-*/
+  */
 #define MAX_POINT_LIGHTS 512
 
 /**
-Maximum number of lights per cluster
+  * Maximum number of lights per cluster
-*/
+  */
 #define MAX_LIGHTS_PER_CLUSTER 100
 
 /**
-Bind points for different SSBOs
+  * Bind points for different SSBOs
-*/
+  */
 #define CLUSTER_SSBO_BIND_POINT 1
 #define POINT_LIGHT_SSBO_BIND_POINT 2
 #define DIRECT_LIGHT_SSBO_BIND_POINT 3
 
 /**
-The direct global light
+  * The direct global light
-*/
+  */
 struct DirectLight {
+    vec3 ambientColor;
     vec3 direction;
     vec3 color;
 };
 
 /**
-A point light
+  * A point light
-*/
+  */
 struct PointLight {
     vec4 position;
     vec4 color;
@@ -39,8 +42,8 @@ struct PointLight {
 };
 
 /**
-A light cluster
+  * A light cluster
-*/
+  */
 struct Cluster {
     vec4 minPoint;
     vec4 maxPoint;
@@ -49,8 +52,8 @@ struct Cluster {
 };
 
 /**
-Cutoff for fragment alpha
+  * Cutoff for fragment alpha
-*/
+  */
 #define FRAGMENT_ALPHA_CUTOFF 0.001
 
 layout(std430, binding = CLUSTER_SSBO_BIND_POINT) restrict buffer clusterGridSSBO {
@@ -70,34 +73,57 @@ layout(std430, binding = DIRECT_LIGHT_SSBO_BIND_POINT) restrict buffer dirLightS
 
 
 /**
-Used for light cluster calculation
+  * Used for light cluster calculation
-*/
+  */
 uniform float zNear;
 uniform float zFar;
 uniform uvec3 gridSize;
 uniform uvec2 screenDimensions;
 
 /**
-The light depth map texture
+  * The light depth map texture
-*/
+  */
 uniform sampler2D shadowMap;
 
 
-
+/**
+  * Finds the light cluster for this fragment
+  */
 uint findCluster(vec3 viewspaceFragPos, float zNear, float zFar);
+
+/**
+  * Calculates the point light's value applied to this fragment
+  */
 vec3 CalcPointLight(PointLight pointLight, vec3 normal, vec3 fragPos, vec3 viewDir);
+
+/**
+  * calculates the total light intensity on this fragment
+  */
 float calcLightIntensityTotal(vec3 normal);
+
+/**
+  * Calculates the shadow applied to this fragment
+  */
 float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal);
 
+/**
+  * Gets the total light to apply to the fragment
+  */
+vec3 getTotalLight(Material mat, vec3 norm, vec3 viewDir);
 
-
+/**
+  * Calculates the ambient light applied to this fragment
+  */
 float calcLightIntensityAmbient(){
     //calculate average of ambient light
-    float avg = (directLight.color.x + directLight.color.y + directLight.color.z)/3.0;
+    float avg = (directLight.ambientColor.x + directLight.ambientColor.y + directLight.ambientColor.z)/3.0;
     return avg;
 }
 
 //
+/**
+  * Calculates the direct light applied to this fragment
+  */
 float calcLightIntensityDir(vec3 normal){
     vec3 lightDir = normalize(-directLight.direction);
     // diffuse shading
@@ -106,7 +132,28 @@ float calcLightIntensityDir(vec3 normal){
     return diff;
 }
 
-//
+/**
+  * Calculates the direct light applied to this fragment
+  */
+vec3 calcLightIntensitySpec(
+  DirectLight directLight,
+  vec3 viewPos,
+  vec3 fragPos,
+  vec3 norm,
+  float shininess,
+  float specularVal
+){
+    vec3 viewDir = normalize(viewPos - fragPos);
+    vec3 reflectDir = reflect(-directLight.direction, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), shininess);
+    vec3 specular = directLight.color * (spec * specularVal);
+    
+    return specular;
+}
+
+/**
+  * Calculates the total light intensity applied to this fragment
+  */
 float calcLightIntensityTotal(vec3 normal){
     //ambient intensity
     float ambientLightIntensity = calcLightIntensityAmbient();
@@ -129,6 +176,9 @@ vec3 getTotalLightColor(vec3 normal){
     return totalLightColor;
 }
 
+/**
+  * Calculates the point light applied to this fragment
+  */
 vec3 CalcPointLight(PointLight pointLight, vec3 normal, vec3 fragPos, vec3 viewDir){
     vec3 lightDir = normalize(pointLight.position.xyz - fragPos);
     // diffuse shading
@@ -161,8 +211,8 @@ vec3 CalcPointLight(PointLight pointLight, vec3 normal, vec3 fragPos, vec3 viewD
 }
 
 /**
-Finds the light cluster this fragment belongs to
+  * Finds the light cluster this fragment belongs to
-*/
+  */
 uint findCluster(vec3 viewspaceFragPos, float zNear, float zFar){
     uint zTile = uint((log(abs(viewspaceFragPos.z) / zNear) * gridSize.z) / log(zFar / zNear));
     vec2 tileSize = screenDimensions / gridSize.xy;
@@ -170,7 +220,9 @@ uint findCluster(vec3 viewspaceFragPos, float zNear, float zFar){
     return tile.x + (tile.y * gridSize.x) + (tile.z * gridSize.x * gridSize.y);
 }
 
-
+/**
+  * Calculates the shadow applied to this fragment
+  */
 float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal){
 
     // perform perspective divide
@@ -206,4 +258,45 @@ float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal){
     // shadow = currentDepth;
 
     return clamp(1.0 - shadow, 0.0, 0.7);
+}
+
+/**
+  * Gets the total light to apply to the fragment
+  */
+vec3 getTotalLight(
+  Material mat,
+  vec3 viewPos,
+  vec4 fragPosLightSpace,
+  vec3 fragPosView,
+  vec3 fragPos,
+  vec3 norm,
+  vec3 viewDir
+){
+  float specular = 1.0f;
+
+  //grab light intensity
+  float ambientLightIntensity = calcLightIntensityAmbient();
+  float directLightIntensity = calcLightIntensityDir(norm);
+  vec3 specularLightIntensity = calcLightIntensitySpec(directLight,viewPos,fragPos,norm,mat.shininess,specular);
+
+  vec3 lightIntensity = vec3(calcLightIntensityTotal(norm));
+
+  //shadow
+  float shadow = ShadowCalculation(fragPosLightSpace, normalize(-directLight.direction), -norm);
+
+  //
+  //point light calculations
+  vec3 lightAmount = vec3(0);
+  uint clusterIndex = findCluster(fragPosView, zNear, zFar);
+  uint pointLightCount = clusters[clusterIndex].count;
+  for(int i = 0; i < pointLightCount; i++){
+      uint pointLightIndex = clusters[clusterIndex].lightIndices[i];
+      PointLight pointLight = pointLight[pointLightIndex];
+      lightIntensity = lightIntensity + CalcPointLight(pointLight, norm, fragPos, viewDir);
+  }
+  //error checking on light clusters
+  if(pointLightCount > MAX_LIGHTS_PER_CLUSTER){
+      return vec3(1.0,0.0,0.0);
+  }
+  return lightIntensity;
 }

docs/src/progress/renderertodo.md

@@ -1901,6 +1901,7 @@ Remove old uniforms from shaders and code to push uniforms
 Break out shader material into dedicated library file
 Materials read some properties from assimp data
 OpenGLState VAO caching
+Ambient light sent in dedicated variable to shader
 
 
 

src/main/java/electrosphere/renderer/light/LightManager.java

@@ -83,7 +83,7 @@ public class LightManager {
     /**
      * Size of the direct light buffer
      */
-    static final int DIRECT_LIGHT_BUFFER_SIZE = 12 + 12;
+    static final int DIRECT_LIGHT_BUFFER_SIZE = 12 + 12 + 12;
 
     /**
      * Bind point for the cluster ssbo
@@ -140,6 +140,7 @@ public class LightManager {
      * The direct light ssbo
      * 
      struct DirectLight {
+        vec3 ambientColor; //12 bytes
         vec3 direction; //12 bytes
         vec3 color; //12 bytes
     };
@@ -151,6 +152,11 @@ public class LightManager {
      */
     private DirectionalLight directionalLight;
 
+    /**
+     * Color of the ambient light
+     */
+    private Vector3f ambientLightColor = new Vector3f(0.8f);
+
     /**
      * Constructor
      */
@@ -270,6 +276,12 @@ public class LightManager {
         //push direct light
         ByteBuffer directLightBuffer = dirLightSSBO.getBuffer();
         {
+            //
+            //ambient light color
+            directLightBuffer.putFloat(ambientLightColor.x);
+            directLightBuffer.putFloat(ambientLightColor.y);
+            directLightBuffer.putFloat(ambientLightColor.z);
+
             //
             //direction
             directLightBuffer.putFloat(directionalLight.getDirection().x);