restructure lights to use one pass per light

Effects/DeferredPBR_AmbientLightEffect.cs

@@ -0,0 +1,31 @@
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Kav
+{
+
+    public class DeferredPBR_AmbientLightEffect : Effect
+    {
+        EffectParameter gPositionParam;
+        EffectParameter gAlbedoParam;
+
+        public Texture2D GPosition { get; set; }
+        public Texture2D GAlbedo { get; set; }
+
+        public DeferredPBR_AmbientLightEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.DeferredPBR_AmbientLightEffect)
+        {
+            CacheEffectParameters();
+        }
+
+        protected override void OnApply()
+        {
+            gPositionParam.SetValue(GPosition);
+            gAlbedoParam.SetValue(GAlbedo);
+        }
+
+        void CacheEffectParameters()
+        {
+            gPositionParam                 = Parameters["gPosition"];
+            gAlbedoParam                   = Parameters["gAlbedo"];
+        }
+    }
+}

Effects/DeferredPBR_DirectionalLightEffect.cs

@@ -0,0 +1,152 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Kav
+{
+    public class DeferredPBR_DirectionalLightEffect : Effect
+    {
+        EffectParameter gPositionParam;
+        EffectParameter gAlbedoParam;
+        EffectParameter gNormalParam;
+        EffectParameter gMetallicRoughnessParam;
+
+        EffectParameter shadowMapOneParam;
+        EffectParameter shadowMapTwoParam;
+        EffectParameter shadowMapThreeParam;
+        EffectParameter shadowMapFourParam;
+
+        EffectParameter eyePositionParam;
+
+        EffectParameter directionalLightColorParam;
+        EffectParameter directionalLightDirectionParam;
+
+        EffectParameter cascadeFarPlanesParam;
+
+        EffectParameter lightSpaceMatrixOneParam;
+        EffectParameter lightSpaceMatrixTwoParam;
+        EffectParameter lightSpaceMatrixThreeParam;
+        EffectParameter lightSpaceMatrixFourParam;
+
+        EffectParameter viewMatrixParam;
+
+        public Texture2D GPosition { get; set; }
+        public Texture2D GAlbedo { get; set; }
+        public Texture2D GNormal { get; set; }
+        public Texture2D GMetallicRoughness { get; set; }
+
+        public Texture2D ShadowMapOne { get; set; }
+        public Texture2D ShadowMapTwo { get; set; }
+        public Texture2D ShadowMapThree { get; set; }
+        public Texture2D ShadowMapFour { get; set; }
+
+        public Vector3 EyePosition { get; set; }
+
+        public Vector3 DirectionalLightDirection { get; set; }
+        public Vector3 DirectionalLightColor { get; set; }
+
+        public readonly float[] CascadeFarPlanes;
+
+        public Matrix LightSpaceMatrixOne { get; set; }
+        public Matrix LightSpaceMatrixTwo { get; set; }
+        public Matrix LightSpaceMatrixThree { get; set; }
+        public Matrix LightSpaceMatrixFour { get; set; }
+
+        public Matrix ViewMatrix { get; set; }
+
+        public DeferredPBR_DirectionalLightEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.DeferredPBR_DirectionalLightEffect)
+        {
+            CascadeFarPlanes = new float[4];
+            CacheEffectParameters();
+        }
+
+        public DeferredPBR_DirectionalLightEffect(DeferredPBR_DirectionalLightEffect cloneSource) : base(cloneSource)
+        {
+            GPosition = cloneSource.GPosition;
+            GAlbedo = cloneSource.GAlbedo;
+            GNormal = cloneSource.GNormal;
+            GMetallicRoughness = cloneSource.GMetallicRoughness;
+
+            ShadowMapOne = cloneSource.ShadowMapOne;
+            ShadowMapTwo = cloneSource.ShadowMapTwo;
+            ShadowMapThree = cloneSource.ShadowMapThree;
+            ShadowMapFour = cloneSource.ShadowMapFour;
+
+            EyePosition = cloneSource.EyePosition;
+
+            DirectionalLightDirection = cloneSource.DirectionalLightDirection;
+            DirectionalLightColor = cloneSource.DirectionalLightColor;
+
+            CascadeFarPlanes = new float[4];
+            for (int i = 0 ; i < 4; i++)
+            {
+                CascadeFarPlanes[i] = cloneSource.CascadeFarPlanes[i];
+            }
+
+            LightSpaceMatrixOne = cloneSource.LightSpaceMatrixOne;
+            LightSpaceMatrixTwo = cloneSource.LightSpaceMatrixTwo;
+            LightSpaceMatrixThree = cloneSource.LightSpaceMatrixThree;
+            LightSpaceMatrixFour = cloneSource.LightSpaceMatrixFour;
+
+            ViewMatrix = cloneSource.ViewMatrix;
+        }
+
+        public override Effect Clone()
+        {
+            return new DeferredPBR_DirectionalLightEffect(this);
+        }
+
+        protected override void OnApply()
+        {
+            gPositionParam.SetValue(GPosition);
+            gAlbedoParam.SetValue(GAlbedo);
+            gNormalParam.SetValue(GNormal);
+            gMetallicRoughnessParam.SetValue(GMetallicRoughness);
+
+            shadowMapOneParam.SetValue(ShadowMapOne);
+            shadowMapTwoParam.SetValue(ShadowMapTwo);
+            shadowMapThreeParam.SetValue(ShadowMapThree);
+            shadowMapFourParam.SetValue(ShadowMapFour);
+
+            eyePositionParam.SetValue(EyePosition);
+
+            directionalLightDirectionParam.SetValue(DirectionalLightDirection);
+            directionalLightColorParam.SetValue(DirectionalLightColor);
+
+            cascadeFarPlanesParam.SetValue(CascadeFarPlanes);
+
+            lightSpaceMatrixOneParam.SetValue(LightSpaceMatrixOne);
+            lightSpaceMatrixTwoParam.SetValue(LightSpaceMatrixTwo);
+            lightSpaceMatrixThreeParam.SetValue(LightSpaceMatrixThree);
+            lightSpaceMatrixFourParam.SetValue(LightSpaceMatrixFour);
+
+            viewMatrixParam.SetValue(ViewMatrix);
+        }
+
+        void CacheEffectParameters()
+        {
+            gPositionParam                 = Parameters["gPosition"];
+            gAlbedoParam                   = Parameters["gAlbedo"];
+            gNormalParam                   = Parameters["gNormal"];
+            gMetallicRoughnessParam        = Parameters["gMetallicRoughness"];
+
+            shadowMapOneParam              = Parameters["shadowMapOne"];
+            shadowMapTwoParam              = Parameters["shadowMapTwo"];
+            shadowMapThreeParam            = Parameters["shadowMapThree"];
+            shadowMapFourParam             = Parameters["shadowMapFour"];
+
+            eyePositionParam               = Parameters["EyePosition"];
+
+            directionalLightDirectionParam = Parameters["DirectionalLightDirection"];
+            directionalLightColorParam     = Parameters["DirectionalLightColor"];
+
+            cascadeFarPlanesParam          = Parameters["CascadeFarPlanes"];
+
+            lightSpaceMatrixOneParam       = Parameters["LightSpaceMatrixOne"];
+            lightSpaceMatrixTwoParam       = Parameters["LightSpaceMatrixTwo"];
+            lightSpaceMatrixThreeParam     = Parameters["LightSpaceMatrixThree"];
+            lightSpaceMatrixFourParam      = Parameters["LightSpaceMatrixFour"];
+
+            viewMatrixParam                = Parameters["ViewMatrix"];
+        }
+    }    
+}

Effects/DeferredPBR_PointLightEffect.cs

@@ -0,0 +1,77 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Kav
+{
+    public class DeferredPBR_PointLightEffect : Effect
+    {
+        EffectParameter gPositionParam;
+        EffectParameter gAlbedoParam;
+        EffectParameter gNormalParam;
+        EffectParameter gMetallicRoughnessParam;
+
+        EffectParameter eyePositionParam;
+
+        EffectParameter pointLightColorParam;
+        EffectParameter pointLightPositionParam;
+
+        public Texture2D GPosition { get; set; }
+        public Texture2D GAlbedo { get; set; }
+        public Texture2D GNormal { get; set; }
+        public Texture2D GMetallicRoughness { get; set; }
+
+        public Vector3 EyePosition { get; set; }
+
+        public Vector3 PointLightPosition { get; set; }
+        public Vector3 PointLightColor { get; set; }
+
+        public DeferredPBR_PointLightEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.DeferredPBR_PointLightEffect)
+        {
+            CacheEffectParameters();
+        }
+
+        public DeferredPBR_PointLightEffect(DeferredPBR_PointLightEffect cloneSource) : base(cloneSource)
+        {
+            GPosition = cloneSource.GPosition;
+            GAlbedo = cloneSource.GAlbedo;
+            GNormal = cloneSource.GNormal;
+            GMetallicRoughness = cloneSource.GMetallicRoughness;
+
+            EyePosition = cloneSource.EyePosition;
+
+            PointLightPosition = cloneSource.PointLightPosition;
+            PointLightColor = cloneSource.PointLightColor;
+        }
+
+        public override Effect Clone()
+        {
+            return new DeferredPBR_PointLightEffect(this);
+        }
+
+        protected override void OnApply()
+        {
+            gPositionParam.SetValue(GPosition);
+            gAlbedoParam.SetValue(GAlbedo);
+            gNormalParam.SetValue(GNormal);
+            gMetallicRoughnessParam.SetValue(GMetallicRoughness);
+
+            eyePositionParam.SetValue(EyePosition);
+
+            pointLightPositionParam.SetValue(PointLightPosition);
+            pointLightColorParam.SetValue(PointLightColor);
+        }
+
+        void CacheEffectParameters()
+        {
+            gPositionParam                 = Parameters["gPosition"];
+            gAlbedoParam                   = Parameters["gAlbedo"];
+            gNormalParam                   = Parameters["gNormal"];
+            gMetallicRoughnessParam        = Parameters["gMetallicRoughness"];
+
+            eyePositionParam               = Parameters["EyePosition"];
+
+            pointLightPositionParam        = Parameters["PointLightPosition"];
+            pointLightColorParam           = Parameters["PointLightColor"];
+        }
+    }
+}

Effects/HLSL/DeferredPBR_AmbientLightEffect.fx

@@ -0,0 +1,54 @@
+#include "Macros.fxh" // from FNA
+
+DECLARE_TEXTURE(gPosition, 0);
+DECLARE_TEXTURE(gAlbedo, 1);
+
+struct VertexInput
+{
+    float4 Position : POSITION;
+    float2 TexCoord : TEXCOORD;
+};
+
+struct PixelInput
+{
+    float4 Position : SV_POSITION;
+    float2 TexCoord : TEXCOORD0;
+};
+
+PixelInput main_vs(VertexInput input)
+{
+    PixelInput output;
+
+    output.Position = input.Position;
+    output.TexCoord = input.TexCoord;
+
+    return output;
+}
+
+float4 ComputeColor(
+    float3 worldPosition,
+    float3 albedo
+) {
+    float3 color = float3(0.03, 0.03, 0.03) * albedo;
+    return float4(color, 1.0);
+}
+
+float4 main_ps(PixelInput input) : SV_TARGET0
+{
+    float3 worldPosition = SAMPLE_TEXTURE(gPosition, input.TexCoord).rgb;
+    float3 albedo = SAMPLE_TEXTURE(gAlbedo, input.TexCoord).rgb;
+
+    return ComputeColor(
+        worldPosition,
+        albedo
+    );
+}
+
+Technique DeferredPBR_Ambient
+{
+    Pass
+    {
+        VertexShader = compile vs_3_0 main_vs();
+        PixelShader = compile ps_3_0 main_ps();
+    }
+}

Effects/HLSL/DeferredPBR_DirectionalLightEffect.fx

@@ -0,0 +1,190 @@
+#include "Macros.fxh" //from FNA
+#include "Lighting.fxh"
+
+static const int NUM_SHADOW_CASCADES = 4;
+
+DECLARE_TEXTURE(gPosition, 0);
+DECLARE_TEXTURE(gAlbedo, 1);
+DECLARE_TEXTURE(gNormal, 2);
+DECLARE_TEXTURE(gMetallicRoughness, 3);
+DECLARE_TEXTURE(shadowMapOne, 4);
+DECLARE_TEXTURE(shadowMapTwo, 5);
+DECLARE_TEXTURE(shadowMapThree, 6);
+DECLARE_TEXTURE(shadowMapFour, 7);
+
+BEGIN_CONSTANTS
+
+    float3 EyePosition                                         _ps(c0)    _cb(c0);
+
+    float3 DirectionalLightDirection                           _ps(c1)    _cb(c1);
+    float3 DirectionalLightColor                               _ps(c2)    _cb(c2);
+
+    float CascadeFarPlanes[NUM_SHADOW_CASCADES]                _ps(c3)    _cb(c3);
+
+MATRIX_CONSTANTS
+
+    float4x4 LightSpaceMatrixOne                               _ps(c7)    _cb(c7);
+    float4x4 LightSpaceMatrixTwo                               _ps(c11)   _cb(c11);
+    float4x4 LightSpaceMatrixThree                             _ps(c15)   _cb(c15);
+    float4x4 LightSpaceMatrixFour                              _ps(c19)   _cb(c19);
+
+    // used to select shadow cascade
+    float4x4 ViewMatrix                                        _ps(c23)   _cb(c23);
+
+END_CONSTANTS
+
+struct VertexInput
+{
+    float4 Position : POSITION;
+    float2 TexCoord : TEXCOORD;
+};
+
+struct PixelInput
+{
+    float4 Position : SV_POSITION;
+    float2 TexCoord : TEXCOORD0;
+};
+
+PixelInput main_vs(VertexInput input)
+{
+    PixelInput output;
+
+    output.Position = input.Position;
+    output.TexCoord = input.TexCoord;
+
+    return output;
+}
+
+// Pixel Shader
+
+float ComputeShadow(float3 positionWorldSpace, float3 N, float3 L)
+{
+    float bias = 0.005 * tan(acos(dot(N, L)));
+    bias = clamp(bias, 0, 0.01);
+
+    float4 positionCameraSpace = mul(float4(positionWorldSpace, 1.0), ViewMatrix);
+
+    int shadowCascadeIndex = 0; // 0 is closest
+    for (int i = 0; i < NUM_SHADOW_CASCADES; i++)
+    {
+        if (abs(positionCameraSpace.z) < CascadeFarPlanes[i])
+        {
+            shadowCascadeIndex = i;
+            break;
+        }
+    }
+
+    float4x4 lightSpaceMatrix;
+
+    if (shadowCascadeIndex == 0)
+    {
+        lightSpaceMatrix = LightSpaceMatrixOne;
+    }
+    else if (shadowCascadeIndex == 1)
+    {
+        lightSpaceMatrix = LightSpaceMatrixTwo;
+    }
+    else if (shadowCascadeIndex == 2)
+    {
+        lightSpaceMatrix = LightSpaceMatrixThree;
+    }
+    else
+    {
+        lightSpaceMatrix = LightSpaceMatrixFour;
+    }
+
+    float4 positionLightSpace = mul(float4(positionWorldSpace, 1.0), lightSpaceMatrix);
+   
+    // maps to [-1, 1]
+    float3 projectionCoords = positionLightSpace.xyz / positionLightSpace.w;
+
+    // maps to [0, 1]
+    projectionCoords.x = (projectionCoords.x * 0.5) + 0.5;
+    projectionCoords.y = (projectionCoords.y * 0.5) + 0.5;
+    projectionCoords.y *= -1;
+    // in XNA clip z is 0 to 1 already
+
+    float inc = 1.0 / 1024.0;
+
+    float shadowFactor = 0;
+    for (int row = -1; row <= 1; row++)
+    {
+        for (int col = -1; col <= 1; col++)
+        {
+            float closestDepth;
+            if (shadowCascadeIndex == 0)
+            {
+                closestDepth = SAMPLE_TEXTURE(shadowMapOne, projectionCoords.xy + float2(row, col) * inc).r;
+            }
+            else if (shadowCascadeIndex == 1)
+            {
+                closestDepth = SAMPLE_TEXTURE(shadowMapTwo, projectionCoords.xy + float2(row, col) * inc).r;
+            }
+            else if (shadowCascadeIndex == 2)
+            {
+                closestDepth = SAMPLE_TEXTURE(shadowMapThree, projectionCoords.xy + float2(row, col) * inc).r;
+            }
+            else
+            {
+                closestDepth = SAMPLE_TEXTURE(shadowMapFour, projectionCoords.xy + float2(row, col) * inc).r;
+            }
+            shadowFactor += projectionCoords.z - bias > closestDepth ? 1.0 : 0.0;
+        }
+    }
+
+    shadowFactor /= 9.0;
+
+    if (projectionCoords.z > 1.0)
+    {
+        shadowFactor = 1.0;
+    }
+
+    return shadowFactor;
+}
+
+float4 ComputeColor(
+    float3 worldPosition,
+    float3 worldNormal,
+    float3 albedo,
+    float metallic,
+    float roughness
+) {
+    float3 V = normalize(EyePosition - worldPosition);
+    float3 N = normalize(worldNormal);
+
+    float3 F0 = float3(0.04, 0.04, 0.04);
+    F0 = lerp(F0, albedo, metallic);
+
+    float3 L = normalize(DirectionalLightDirection);
+    float3 radiance = DirectionalLightColor;
+
+    float shadow = ComputeShadow(worldPosition, N, L);
+    float3 color = ComputeLight(L, radiance, F0, V, N, albedo, metallic, roughness, (1.0 - shadow));
+
+    return float4(color, 1.0);
+}
+
+float4 main_ps(PixelInput input) : SV_TARGET0
+{
+    float3 worldPosition = SAMPLE_TEXTURE(gPosition, input.TexCoord).rgb;
+    float3 normal = SAMPLE_TEXTURE(gNormal, input.TexCoord).xyz;
+    float3 albedo = SAMPLE_TEXTURE(gAlbedo, input.TexCoord).rgb;
+    float2 metallicRoughness = SAMPLE_TEXTURE(gMetallicRoughness, input.TexCoord).rg;
+
+    return ComputeColor(
+        worldPosition,
+        normal,
+        albedo,
+        metallicRoughness.r,
+        metallicRoughness.g
+    );
+}
+
+Technique DeferredPBR_Directional
+{
+    Pass
+    {
+        VertexShader = compile vs_3_0 main_vs();
+        PixelShader = compile ps_3_0 main_ps();
+    }
+}

Effects/HLSL/DeferredPBR_GBufferEffect.fx

@@ -79,10 +79,10 @@ PixelOutput NonePS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(normalize(input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(normalize(input.NormalWorld), 1.0);
     output.gAlbedo = float4(AlbedoValue, 1.0);
-    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 0.0);
+    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 1.0);
 
     return output;
 }
@@ -91,10 +91,10 @@ PixelOutput AlbedoPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(normalize(input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(normalize(input.NormalWorld), 1.0);
     output.gAlbedo = SAMPLE_TEXTURE(AlbedoTexture, input.TexCoord);
-    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 0.0);
+    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 1.0);
 
     return output;
 }
@@ -103,8 +103,8 @@ PixelOutput MetallicRoughnessPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(normalize(input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(normalize(input.NormalWorld), 1.0);
     output.gAlbedo = float4(AlbedoValue, 1.0);
     output.gMetallicRoughness = SAMPLE_TEXTURE(MetallicRoughnessTexture, input.TexCoord);
 
@@ -115,10 +115,10 @@ PixelOutput NormalPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 1.0);
     output.gAlbedo = float4(AlbedoValue, 1.0);
-    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 0.0);
+    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 1.0);
 
     return output;
 }
@@ -127,8 +127,8 @@ PixelOutput AlbedoMetallicRoughnessPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(normalize(input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(normalize(input.NormalWorld), 1.0);
     output.gAlbedo = SAMPLE_TEXTURE(AlbedoTexture, input.TexCoord);
     output.gMetallicRoughness = SAMPLE_TEXTURE(MetallicRoughnessTexture, input.TexCoord);
 
@@ -139,10 +139,10 @@ PixelOutput AlbedoNormalPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 1.0);
     output.gAlbedo = SAMPLE_TEXTURE(AlbedoTexture, input.TexCoord);
-    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 0.0);
+    output.gMetallicRoughness = float4(MetallicValue, RoughnessValue, 0.0, 1.0);
 
     return output;
 }
@@ -151,8 +151,8 @@ PixelOutput MetallicRoughnessNormalPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 1.0);
     output.gAlbedo = float4(AlbedoValue, 1.0);
     output.gMetallicRoughness = SAMPLE_TEXTURE(MetallicRoughnessTexture, input.TexCoord);
 
@@ -163,8 +163,8 @@ PixelOutput AlbedoMetallicRoughnessNormalMapPS(PixelInput input)
 {
     PixelOutput output;
 
-    output.gPosition = float4(input.PositionWorld, 0.0);
-    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 0.0);
+    output.gPosition = float4(input.PositionWorld, 1.0);
+    output.gNormal = float4(GetNormalFromMap(input.PositionWorld, input.TexCoord, input.NormalWorld), 1.0);
     output.gAlbedo = SAMPLE_TEXTURE(AlbedoTexture, input.TexCoord);
     output.gMetallicRoughness = SAMPLE_TEXTURE(MetallicRoughnessTexture, input.TexCoord);
 

Effects/HLSL/DeferredPBR_PointLightEffect.fx

@@ -0,0 +1,91 @@
+#include "Macros.fxh" //from FNA
+#include "Lighting.fxh" 
+
+DECLARE_TEXTURE(gPosition, 0);
+DECLARE_TEXTURE(gAlbedo, 1);
+DECLARE_TEXTURE(gNormal, 2);
+DECLARE_TEXTURE(gMetallicRoughness, 3);
+
+BEGIN_CONSTANTS
+
+    float3 EyePosition                      _ps(c0)     _cb(c0);
+    
+    float3 PointLightPosition               _ps(c1)     _cb(c1);
+    float3 PointLightColor                  _ps(c2)     _cb(c2);
+
+MATRIX_CONSTANTS
+
+END_CONSTANTS
+
+struct VertexInput
+{
+    float4 Position : POSITION;
+    float2 TexCoord : TEXCOORD;
+};
+
+struct PixelInput
+{
+    float4 Position : SV_POSITION;
+    float2 TexCoord : TEXCOORD0;
+};
+
+PixelInput main_vs(VertexInput input)
+{
+    PixelInput output;
+
+    output.Position = input.Position;
+    output.TexCoord = input.TexCoord;
+    
+    return output;
+}
+
+// Pixel Shader
+
+float4 ComputeColor(
+    float3 worldPosition,
+    float3 worldNormal,
+    float3 albedo,
+    float metallic,
+    float roughness
+) {
+    float3 V = normalize(EyePosition - worldPosition);
+    float3 N = normalize(worldNormal);
+
+    float3 F0 = float3(0.04, 0.04, 0.04);
+    F0 = lerp(F0, albedo, metallic);
+
+    float3 lightDir = PointLightPosition - worldPosition;
+    float3 L = normalize(lightDir);
+    float distance = length(lightDir);
+    float attenuation = 1.0 / (distance * distance);
+    float3 radiance = PointLightColor * attenuation;
+
+    float3 color = ComputeLight(L, radiance, F0, V, N, albedo, metallic, roughness, 1.0);
+
+    return float4(color, 1.0);
+}
+
+float4 main_ps(PixelInput input) : SV_TARGET0
+{
+    float3 worldPosition = SAMPLE_TEXTURE(gPosition, input.TexCoord).rgb;
+    float3 normal = SAMPLE_TEXTURE(gNormal, input.TexCoord).xyz;
+    float3 albedo = SAMPLE_TEXTURE(gAlbedo, input.TexCoord).rgb;
+    float2 metallicRoughness = SAMPLE_TEXTURE(gMetallicRoughness, input.TexCoord).rg;
+
+    return ComputeColor(
+        worldPosition,
+        normal,
+        albedo,
+        metallicRoughness.r,
+        metallicRoughness.g
+    );
+}
+
+Technique DeferredPBR_Point
+{
+    Pass
+    {
+        VertexShader = compile vs_3_0 main_vs();
+        PixelShader = compile ps_3_0 main_ps();
+    }
+}

Effects/HLSL/Lighting.fxh

@@ -0,0 +1,71 @@
+static const float PI = 3.141592653589793;
+
+float3 FresnelSchlick(float cosTheta, float3 F0)
+{
+    return F0 + (1.0 - F0) * pow(1.0 - cosTheta, 5.0);
+}
+
+float DistributionGGX(float3 N, float3 H, float roughness)
+{
+    float a = roughness * roughness;
+    float a2 = a * a;
+    float NdotH = max(dot(N, H), 0.0);
+    float NdotH2 = NdotH * NdotH;
+
+    float num = a2;
+    float denom = (NdotH2 * (a2 - 1.0) + 1.0);
+    denom = PI * denom * denom;
+
+    return num / denom;
+}
+
+float GeometrySchlickGGX(float NdotV, float roughness)
+{
+    float r = (roughness + 1.0);
+    float k = (r * r) / 8.0;
+
+    float num = NdotV;
+    float denom = NdotV * (1.0 - k) + k;
+
+    return num / denom;
+}
+
+float GeometrySmith(float3 N, float3 V, float3 L, float roughness)
+{
+    float NdotV = max(dot(N, V), 0.0);
+    float NdotL = max(dot(N, L), 0.0);
+    float ggx2 = GeometrySchlickGGX(NdotV, roughness);
+    float ggx1 = GeometrySchlickGGX(NdotL, roughness);
+
+    return ggx1 * ggx2;
+}
+
+float3 ComputeLight(
+    float3 L,
+    float3 radiance,
+    float3 F0,
+    float3 V,
+    float3 N,
+    float3 albedo,
+    float metallic,
+    float roughness,
+    float shadow
+) {
+    float3 H = normalize(V + L);
+
+    float NDF = DistributionGGX(N, H, roughness);
+    float G = GeometrySmith(N, V, L, roughness);
+    float3 F = FresnelSchlick(max(dot(H, V), 0.0), F0);
+
+    float3 numerator = NDF * G * F;
+    float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0);
+    float3 specular = numerator / max(denominator, 0.001);
+
+    float3 kS = F;
+    float3 kD = float3(1.0, 1.0, 1.0) - kS;
+
+    kD *= 1.0 - metallic;
+
+    float NdotL = max(dot(N, L), 0.0);
+    return (kD * albedo / PI + specular) * radiance * NdotL * shadow;
+}

Kav.Core.csproj

@@ -15,6 +15,15 @@
   </ItemGroup>
 
   <ItemGroup>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_AmbientLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_AmbientLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_PointLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_PointLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_DirectionalLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_DirectionalLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
     <EmbeddedResource Include="Effects\FXB\DeferredPBR_GBufferEffect.fxb">
       <LogicalName>Kav.Resources.DeferredPBR_GBufferEffect.fxb</LogicalName>
     </EmbeddedResource>

Kav.Framework.csproj

@@ -15,6 +15,15 @@
   </ItemGroup>
 
   <ItemGroup>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_AmbientLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_AmbientLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_PointLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_PointLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Effects\FXB\DeferredPBR_DirectionalLightEffect.fxb">
+      <LogicalName>Kav.Resources.DeferredPBR_DirectionalLightEffect.fxb</LogicalName>
+    </EmbeddedResource>
     <EmbeddedResource Include="Effects\FXB\DeferredPBR_GBufferEffect.fxb">
       <LogicalName>Kav.Resources.DeferredPBR_GBufferEffect.fxb</LogicalName>
     </EmbeddedResource>

README.md

@@ -12,6 +12,7 @@ Essential
 - [x] Directional lighting
 - [x] Directional shadow maps
 - [x] Cascading shadow maps
+- [ ] Tone map shader
 - [ ] Frustum culling
 - [ ] PCF soft shadowing
 - [ ] Shadow-casting point lights

Renderer.cs

@@ -8,26 +8,32 @@ namespace Kav
     {
         private const int MAX_SHADOW_CASCADES = 4;
 
-
         private GraphicsDevice GraphicsDevice { get; }
         private int RenderDimensionsX { get; }
         private int RenderDimensionsY { get; }
 
         private VertexBuffer FullscreenTriangle { get; }
         private int NumShadowCascades { get; }
+
+        private RenderTarget2D ColorRenderTarget { get; }
+        private RenderTarget2D DirectionalRenderTarget { get; }
         private RenderTarget2D[] ShadowRenderTargets { get; }
 
         private DeferredPBREffect DeferredPBREffect { get; }
+        private DeferredPBR_AmbientLightEffect DeferredAmbientLightEffect { get; }
+        private DeferredPBR_PointLightEffect DeferredPointLightEffect { get; }
+        private DeferredPBR_DirectionalLightEffect DeferredDirectionalLightEffect { get; }
         private SimpleDepthEffect SimpleDepthEffect { get; }
 
         private RenderTarget2D gPosition { get; }
         private RenderTarget2D gNormal { get; }
         private RenderTarget2D gAlbedo { get; }
         private RenderTarget2D gMetallicRoughness { get; }
-        private RenderTarget2D deferredRenderTarget { get; }
 
         private RenderTargetBinding[] GBuffer { get; }
 
+        private SpriteBatch SpriteBatch { get; }
+
         public Renderer(GraphicsDevice graphicsDevice, int renderDimensionsX, int renderDimensionsY, int numShadowCascades)
         {
             GraphicsDevice = graphicsDevice;
@@ -49,6 +55,28 @@ namespace Kav
                 );
             }
 
+            ColorRenderTarget = new RenderTarget2D(
+                graphicsDevice,
+                renderDimensionsX,
+                renderDimensionsY,
+                false,
+                SurfaceFormat.Color,
+                DepthFormat.None,
+                0,
+                RenderTargetUsage.PreserveContents
+            );
+
+            DirectionalRenderTarget = new RenderTarget2D(
+                graphicsDevice,
+                renderDimensionsX,
+                renderDimensionsY,
+                false,
+                SurfaceFormat.Color,
+                DepthFormat.None,
+                0,
+                RenderTargetUsage.PreserveContents
+            );
+
             gPosition = new RenderTarget2D(
                 GraphicsDevice,
                 renderDimensionsX,
@@ -91,26 +119,21 @@ namespace Kav
                 new RenderTargetBinding(gAlbedo),
                 new RenderTargetBinding(gMetallicRoughness)
             };
-            
-            deferredRenderTarget = new RenderTarget2D(
-                GraphicsDevice,
-                renderDimensionsX,
-                renderDimensionsY
-            );
 
             SimpleDepthEffect = new SimpleDepthEffect(GraphicsDevice);
             DeferredPBREffect = new DeferredPBREffect(GraphicsDevice);
+            DeferredAmbientLightEffect = new DeferredPBR_AmbientLightEffect(GraphicsDevice);
+            DeferredPointLightEffect = new DeferredPBR_PointLightEffect(GraphicsDevice);
+            DeferredDirectionalLightEffect = new DeferredPBR_DirectionalLightEffect(GraphicsDevice);
 
             FullscreenTriangle = new VertexBuffer(GraphicsDevice, typeof(VertexPositionTexture), 3, BufferUsage.WriteOnly);
             FullscreenTriangle.SetData(new VertexPositionTexture[3] {
-                new VertexPositionTexture(new Vector3(-1, -1, 0), new Vector2(0, 0)),
-                new VertexPositionTexture(new Vector3(-1, 3, 0), new Vector2(0, -2)),
-                new VertexPositionTexture(new Vector3(3, -1, 0), new Vector2(2, 0))
+                new VertexPositionTexture(new Vector3(-1, -3, 0), new Vector2(0, 2)),
+                new VertexPositionTexture(new Vector3(-1, 1, 0), new Vector2(0, 0)),
+                new VertexPositionTexture(new Vector3(3, 1, 0), new Vector2(2, 0))
             });
 
-            GraphicsDevice.SetRenderTarget(deferredRenderTarget);
-            graphicsDevice.Clear(Color.White);
-            GraphicsDevice.SetRenderTarget(null);
+            SpriteBatch = new SpriteBatch(graphicsDevice);
         }
 
         public void DeferredRender(
@@ -119,7 +142,7 @@ namespace Kav
             IEnumerable<PointLight> pointLights,
             DirectionalLight directionalLight
         ) {
-            ShadowMapRender(camera, modelTransforms, directionalLight);
+            // g-buffer pass
 
             GraphicsDevice.SetRenderTargets(GBuffer);
             GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Black, 1f, 0);
@@ -159,45 +182,54 @@ namespace Kav
                 }
             }
 
-            GraphicsDevice.SetRenderTarget(null);
-            GraphicsDevice.Clear(Color.CornflowerBlue);
+            GraphicsDevice.SetRenderTarget(ColorRenderTarget);
+            GraphicsDevice.Clear(Color.Black);
+            GraphicsDevice.BlendState = BlendState.Additive;
+            GraphicsDevice.DepthStencilState = DepthStencilState.None;
 
-            DeferredPBREffect.GPosition = gPosition;
-            DeferredPBREffect.GAlbedo = gAlbedo;
-            DeferredPBREffect.GNormal = gNormal;
-            DeferredPBREffect.GMetallicRoughness = gMetallicRoughness;
-            
-            DeferredPBREffect.ShadowMapOne = ShadowRenderTargets[0];
-            if (NumShadowCascades > 1)
+            DeferredAmbientLightEffect.GPosition = gPosition;
+            DeferredAmbientLightEffect.GAlbedo = gAlbedo;
+
+            foreach (var pass in DeferredAmbientLightEffect.CurrentTechnique.Passes)
             {
-                DeferredPBREffect.ShadowMapTwo = ShadowRenderTargets[1];
-            }
-            if (NumShadowCascades > 2)
-            {
-                DeferredPBREffect.ShadowMapThree = ShadowRenderTargets[2];
-            }
-            if (NumShadowCascades > 3)
-            {
-                DeferredPBREffect.ShadowMapFour = ShadowRenderTargets[3];
+                pass.Apply();
+                GraphicsDevice.SetVertexBuffer(FullscreenTriangle);
+                GraphicsDevice.DrawPrimitives(PrimitiveType.TriangleList, 0, 1);
             }
 
-            DeferredPBREffect.ViewMatrix = camera.View;
+            DeferredPointLightEffect.EyePosition = camera.Position;
 
-            DeferredPBREffect.EyePosition = Matrix.Invert(camera.View).Translation;
-
-            int i = 0;
             foreach (var pointLight in pointLights)
             {
-                if (i > DeferredPBREffect.MaxPointLights) { break; }
-                DeferredPBREffect.PointLights[i] = pointLight;
-                i++;
+                PointLightRender(pointLight);
             }
 
-            DeferredPBREffect.DirectionalLightColor = directionalLight.Color.ToVector3() * directionalLight.Intensity;
-            DeferredPBREffect.DirectionalLightDirection = directionalLight.Direction;
+            DirectionalLightRender(camera, modelTransforms, directionalLight);
+            // return;
+            // GraphicsDevice.SetRenderTarget(null);
+            // SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied);
+            // SpriteBatch.Draw(DirectionalRenderTarget, Vector2.Zero, Color.White);
+            // SpriteBatch.End();
 
+            GraphicsDevice.SetRenderTarget(null);
+            GraphicsDevice.Clear(Color.Black);
+            SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Opaque);
+            SpriteBatch.Draw(ColorRenderTarget, Vector2.Zero, Color.White);
+            SpriteBatch.End();
+        }
 
-            foreach (EffectPass pass in DeferredPBREffect.CurrentTechnique.Passes)
+        private void PointLightRender(PointLight pointLight) 
+        {
+            DeferredPointLightEffect.GPosition = gPosition;
+            DeferredPointLightEffect.GAlbedo = gAlbedo;
+            DeferredPointLightEffect.GNormal = gNormal;
+            DeferredPointLightEffect.GMetallicRoughness = gMetallicRoughness;    
+
+            DeferredPointLightEffect.PointLightPosition = pointLight.Position;
+            DeferredPointLightEffect.PointLightColor = 
+                pointLight.Color.ToVector3() * pointLight.Intensity;
+
+            foreach (var pass in DeferredPointLightEffect.CurrentTechnique.Passes)
             {
                 pass.Apply();
                 GraphicsDevice.SetVertexBuffer(FullscreenTriangle);
@@ -205,12 +237,12 @@ namespace Kav
             }
         }
 
-        public void ShadowMapRender(
-            PerspectiveCamera camera, 
-            IEnumerable<(Model, Matrix)> modelTransforms, 
+        private void DirectionalLightRender(
+            PerspectiveCamera camera,
+            IEnumerable<(Model, Matrix)> modelTransforms,
             DirectionalLight directionalLight
         ) {
-            // render the individual shadow maps
+            // render the individual shadow cascades
             var previousFarPlane = camera.NearPlane;
             for (var i = 0; i < NumShadowCascades; i++)
             {
@@ -227,10 +259,47 @@ namespace Kav
                     farPlane
                 );
                 
+                // TODO: This is tightly coupled to the effect and it sucks
                 RenderShadowMap(shadowCamera, modelTransforms, directionalLight, i);
 
                 previousFarPlane = farPlane;
             }
+
+            DeferredDirectionalLightEffect.GPosition = gPosition;
+            DeferredDirectionalLightEffect.GAlbedo = gAlbedo;
+            DeferredDirectionalLightEffect.GNormal = gNormal;
+            DeferredDirectionalLightEffect.GMetallicRoughness = gMetallicRoughness;
+
+            DeferredDirectionalLightEffect.ShadowMapOne = ShadowRenderTargets[0];
+            if (NumShadowCascades > 1)
+            {
+                DeferredDirectionalLightEffect.ShadowMapTwo = ShadowRenderTargets[1];
+            }
+            if (NumShadowCascades > 2)
+            {
+                DeferredDirectionalLightEffect.ShadowMapThree = ShadowRenderTargets[2];
+            }
+            if (NumShadowCascades > 3)
+            {
+                DeferredDirectionalLightEffect.ShadowMapFour = ShadowRenderTargets[3];
+            }
+            
+            DeferredDirectionalLightEffect.DirectionalLightDirection = directionalLight.Direction;
+            DeferredDirectionalLightEffect.DirectionalLightColor = 
+                directionalLight.Color.ToVector3() * directionalLight.Intensity;
+            
+            DeferredDirectionalLightEffect.ViewMatrix = camera.View;
+            DeferredDirectionalLightEffect.EyePosition = Matrix.Invert(camera.View).Translation;
+
+            GraphicsDevice.SetRenderTarget(ColorRenderTarget);
+            GraphicsDevice.BlendState = BlendState.Additive;
+
+            foreach (EffectPass pass in DeferredDirectionalLightEffect.CurrentTechnique.Passes)
+            {
+                pass.Apply();
+                GraphicsDevice.SetVertexBuffer(FullscreenTriangle);
+                GraphicsDevice.DrawPrimitives(PrimitiveType.TriangleList, 0, 1);
+            }
         }
 
         private void RenderShadowMap(
@@ -277,22 +346,22 @@ namespace Kav
 
             if (shadowCascadeIndex == 0)
             {
-                DeferredPBREffect.LightSpaceMatrixOne = lightSpaceMatrix;
+                DeferredDirectionalLightEffect.LightSpaceMatrixOne = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 1)
             {
-                DeferredPBREffect.LightSpaceMatrixTwo = lightSpaceMatrix;
+                DeferredDirectionalLightEffect.LightSpaceMatrixTwo = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 2)
             {
-                DeferredPBREffect.LightSpaceMatrixThree = lightSpaceMatrix;
+                DeferredDirectionalLightEffect.LightSpaceMatrixThree = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 3)
             {
-                DeferredPBREffect.LightSpaceMatrixFour = lightSpaceMatrix;
+                DeferredDirectionalLightEffect.LightSpaceMatrixFour = lightSpaceMatrix;
             }
 
-            DeferredPBREffect.CascadeFarPlanes[shadowCascadeIndex] = camera.FarPlane;
+            DeferredDirectionalLightEffect.CascadeFarPlanes[shadowCascadeIndex] = camera.FarPlane;
 
             foreach (var (model, transform) in modelTransforms)
             {

Resources.cs

@@ -4,6 +4,41 @@ namespace Kav
 {
     internal class Resources
     {
+        public static byte[] DeferredPBR_AmbientLightEffect
+        {
+            get
+            {
+                if (ambientLightEffect == null)
+                {
+                    ambientLightEffect = GetResource("DeferredPBR_AmbientLightEffect");
+                }
+                return ambientLightEffect;
+            }
+        }
+        public static byte[] DeferredPBR_PointLightEffect
+        {
+            get
+            {
+                if (pointLightEffect == null)
+                {
+                    pointLightEffect = GetResource("DeferredPBR_PointLightEffect");
+                }
+                return pointLightEffect;
+            }
+        }
+
+        public static byte[] DeferredPBR_DirectionalLightEffect
+        {
+            get
+            {
+                if (directionalLightEffect == null)
+                {
+                    directionalLightEffect = GetResource("DeferredPBR_DirectionalLightEffect");
+                }
+                return directionalLightEffect;
+            }
+        }
+
         public static byte[] DeferredPBR_GBufferEffect
         {
             get
@@ -52,6 +87,9 @@ namespace Kav
             }
         }
 
+        private static byte[] ambientLightEffect;
+        private static byte[] pointLightEffect;
+        private static byte[] directionalLightEffect;
         private static byte[] gBufferEffect;
         private static byte[] deferredPBREffect;
         private static byte[] pbrEffect;