Resolve "Voxel cone tracing"

Closes #82 (closed)

projects/voxelization/resources/shaders/shader.frag

@@ -9,6 +9,7 @@
 layout(location = 0) in vec3 passNormal;
 layout(location = 1) in vec2 passUV;
 layout(location = 2) in vec3 passPos;
+layout(location = 3) in vec4 passTangent;
 
 layout(location = 0) out vec3 outColor;
 
@@ -19,10 +20,22 @@ layout(set=0, binding=1) uniform texture2D  shadowMap;
 layout(set=0, binding=2) uniform sampler    shadowMapSampler;
 
 void main()	{
-    vec3 N          = normalize(passNormal);
+
+    vec3 albedoTexel    = texture(sampler2D(albedoTexture, textureSampler), passUV).rgb;
+    vec3 normalTexel    = texture(sampler2D(normalTexture, textureSampler), passUV).rgb;
+    vec3 specularTexel  = texture(sampler2D(specularTexture, textureSampler), passUV).rgb;
+    
+    vec3 albedo = albedoTexel;
+    
+    vec3 T      = normalize(passTangent.xyz);
+    vec3 N_geo  = normalize(passNormal);
+    vec3 B      = cross(N_geo, T) * passTangent.w;
+    mat3 TBN    = mat3(T, B, N_geo);
+    normalTexel = normalTexel * 2 - 1;
+    
+    vec3 N          = TBN * normalTexel;
     vec3 sun        = lightInfo.sunStrength * lightInfo.sunColor * clamp(dot(N, lightInfo.L), 0, 1);
     sun             *= shadowTest(passPos, lightInfo, shadowMap, shadowMapSampler);
     vec3 ambient    = vec3(0.05);
-    vec3 albedo     = texture(sampler2D(albedoTexture, textureSampler), passUV).rgb;
-	outColor        = albedo * (sun + ambient);
+	outColor        = albedo * (sun + ambient); 
 }
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