deferred pbr shading
parent
be611687a8
commit
ffcb3326e8
|
|
@ -0,0 +1,88 @@
|
|||
using Microsoft.Xna.Framework;
|
||||
using Microsoft.Xna.Framework.Graphics;
|
||||
|
||||
namespace Kav
|
||||
{
|
||||
public class DeferredPBREffect : Effect
|
||||
{
|
||||
EffectParameter gPositionParam;
|
||||
EffectParameter gAlbedoParam;
|
||||
EffectParameter gNormalParam;
|
||||
EffectParameter gMetallicRoughnessParam;
|
||||
|
||||
EffectParameter eyePositionParam;
|
||||
PointLightCollection pointLightCollection;
|
||||
|
||||
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 int MaxPointLights { get; } = 64;
|
||||
|
||||
public PointLightCollection PointLights
|
||||
{
|
||||
get { return pointLightCollection; }
|
||||
private set { pointLightCollection = value; }
|
||||
}
|
||||
|
||||
public DeferredPBREffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.DeferredPBREffect)
|
||||
{
|
||||
CacheEffectParameters();
|
||||
|
||||
pointLightCollection = new PointLightCollection(
|
||||
Parameters["PointLightPositions"],
|
||||
Parameters["PointLightColors"],
|
||||
MaxPointLights
|
||||
);
|
||||
}
|
||||
|
||||
protected DeferredPBREffect(DeferredPBREffect cloneSource) : base(cloneSource)
|
||||
{
|
||||
GPosition = cloneSource.GPosition;
|
||||
GAlbedo = cloneSource.GAlbedo;
|
||||
GNormal = cloneSource.GNormal;
|
||||
GMetallicRoughness = cloneSource.GMetallicRoughness;
|
||||
|
||||
EyePosition = cloneSource.EyePosition;
|
||||
|
||||
PointLights = new PointLightCollection(
|
||||
Parameters["LightPositions"],
|
||||
Parameters["PositionLightColors"],
|
||||
MaxPointLights
|
||||
);
|
||||
|
||||
for (int i = 0; i < MaxPointLights; i++)
|
||||
{
|
||||
PointLights[i] = cloneSource.PointLights[i];
|
||||
}
|
||||
}
|
||||
|
||||
public override Effect Clone()
|
||||
{
|
||||
return new DeferredPBREffect(this);
|
||||
}
|
||||
|
||||
protected override void OnApply()
|
||||
{
|
||||
gPositionParam.SetValue(GPosition);
|
||||
gAlbedoParam.SetValue(GAlbedo);
|
||||
gNormalParam.SetValue(GNormal);
|
||||
gMetallicRoughnessParam.SetValue(GMetallicRoughness);
|
||||
|
||||
eyePositionParam.SetValue(EyePosition);
|
||||
}
|
||||
|
||||
void CacheEffectParameters()
|
||||
{
|
||||
gPositionParam = Parameters["gPosition"];
|
||||
gAlbedoParam = Parameters["gAlbedo"];
|
||||
gNormalParam = Parameters["gNormal"];
|
||||
gMetallicRoughnessParam = Parameters["gMetallicRoughness"];
|
||||
|
||||
eyePositionParam = Parameters["EyePosition"];
|
||||
}
|
||||
}
|
||||
}
|
||||
Binary file not shown.
|
|
@ -0,0 +1,167 @@
|
|||
#include "Macros.fxh" //from FNA
|
||||
|
||||
static const float PI = 3.141592653589793;
|
||||
static const int MAX_POINT_LIGHTS = 64;
|
||||
|
||||
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 PointLightPositions[MAX_POINT_LIGHTS] _ps(c1) _cb(c1);
|
||||
float3 PointLightColors[MAX_POINT_LIGHTS] _ps(c65) _cb(c65);
|
||||
|
||||
MATRIX_CONSTANTS
|
||||
|
||||
END_CONSTANTS
|
||||
|
||||
struct PixelInput
|
||||
{
|
||||
float4 Position : SV_POSITION;
|
||||
float2 TexCoord : TEXCOORD0;
|
||||
};
|
||||
|
||||
// Pixel Shader
|
||||
|
||||
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 lightDir,
|
||||
float3 radiance,
|
||||
float3 F0,
|
||||
float3 V,
|
||||
float3 N,
|
||||
float3 albedo,
|
||||
float metallic,
|
||||
float roughness
|
||||
) {
|
||||
float3 L = normalize(lightDir);
|
||||
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;
|
||||
}
|
||||
|
||||
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 Lo = float3(0.0, 0.0, 0.0);
|
||||
|
||||
// point light
|
||||
for (int i = 0; i < MAX_POINT_LIGHTS; i++)
|
||||
{
|
||||
float3 lightDir = PointLightPositions[i] - worldPosition;
|
||||
float distance = length(lightDir);
|
||||
float attenuation = 1.0 / (distance * distance);
|
||||
float3 radiance = PointLightColors[i] * attenuation;
|
||||
|
||||
Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness);
|
||||
}
|
||||
|
||||
// // directional light
|
||||
// for (int i = 0; i < 4; i++)
|
||||
// {
|
||||
// float3 lightDir = LightDirections[i];
|
||||
// float3 radiance = DirectionLightColors[i];
|
||||
|
||||
// Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness);
|
||||
// }
|
||||
|
||||
float3 ambient = float3(0.03, 0.03, 0.03) * albedo; // * AO;
|
||||
float3 color = ambient + Lo;
|
||||
|
||||
color = color / (color + float3(1.0, 1.0, 1.0));
|
||||
float exposureConstant = 1.0 / 2.2;
|
||||
color = pow(color, float3(exposureConstant, exposureConstant, exposureConstant));
|
||||
|
||||
return float4(color, 1.0);
|
||||
}
|
||||
|
||||
float4 main_ps(PixelInput input) : SV_TARGET0
|
||||
{
|
||||
float3 fragPosition = 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(
|
||||
fragPosition,
|
||||
normal,
|
||||
albedo,
|
||||
metallicRoughness.r,
|
||||
metallicRoughness.g
|
||||
);
|
||||
}
|
||||
|
||||
Technique DeferredPBR
|
||||
{
|
||||
Pass
|
||||
{
|
||||
PixelShader = compile ps_3_0 main_ps();
|
||||
}
|
||||
}
|
||||
|
|
@ -3,48 +3,6 @@ using Microsoft.Xna.Framework.Graphics;
|
|||
|
||||
namespace Kav
|
||||
{
|
||||
public class PointLightCollection
|
||||
{
|
||||
private readonly Vector3[] positions = new Vector3[4];
|
||||
private readonly Vector3[] colors = new Vector3[4];
|
||||
private readonly float[] intensities = new float[4];
|
||||
|
||||
readonly EffectParameter lightPositionsParam;
|
||||
readonly EffectParameter lightColorsParam;
|
||||
|
||||
public PointLightCollection(EffectParameter lightPositionsParam, EffectParameter lightColorsParam)
|
||||
{
|
||||
this.lightPositionsParam = lightPositionsParam;
|
||||
this.lightColorsParam = lightColorsParam;
|
||||
}
|
||||
|
||||
public PointLight this[int i]
|
||||
{
|
||||
get
|
||||
{
|
||||
var color = colors[i] / intensities[i];
|
||||
return new PointLight(
|
||||
positions[i],
|
||||
new Color(
|
||||
color.X,
|
||||
color.Y,
|
||||
color.Z,
|
||||
1f
|
||||
),
|
||||
intensities[i]
|
||||
);
|
||||
}
|
||||
set
|
||||
{
|
||||
positions[i] = value.Position;
|
||||
colors[i] = value.Color.ToVector3() * value.Intensity;
|
||||
intensities[i] = value.Intensity;
|
||||
lightPositionsParam.SetValue(positions);
|
||||
lightColorsParam.SetValue(colors);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public class DirectionalLightCollection
|
||||
{
|
||||
private readonly Vector3[] directions = new Vector3[4];
|
||||
|
|
@ -285,7 +243,8 @@ namespace Kav
|
|||
|
||||
pointLightCollection = new PointLightCollection(
|
||||
Parameters["LightPositions"],
|
||||
Parameters["PositionLightColors"]
|
||||
Parameters["PositionLightColors"],
|
||||
MaxPointLights
|
||||
);
|
||||
|
||||
directionalLightCollection = new DirectionalLightCollection(
|
||||
|
|
@ -304,7 +263,8 @@ namespace Kav
|
|||
|
||||
PointLights = new PointLightCollection(
|
||||
Parameters["LightPositions"],
|
||||
Parameters["PositionLightColors"]
|
||||
Parameters["PositionLightColors"],
|
||||
MaxPointLights
|
||||
);
|
||||
|
||||
for (int i = 0; i < MaxPointLights; i++)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,49 @@
|
|||
using Microsoft.Xna.Framework;
|
||||
using Microsoft.Xna.Framework.Graphics;
|
||||
|
||||
namespace Kav
|
||||
{
|
||||
public class PointLightCollection
|
||||
{
|
||||
private readonly Vector3[] positions;
|
||||
private readonly Vector3[] colors;
|
||||
private readonly float[] intensities = new float[4];
|
||||
|
||||
readonly EffectParameter lightPositionsParam;
|
||||
readonly EffectParameter lightColorsParam;
|
||||
|
||||
public PointLightCollection(EffectParameter lightPositionsParam, EffectParameter lightColorsParam, int maxLights)
|
||||
{
|
||||
this.positions = new Vector3[maxLights];
|
||||
this.colors = new Vector3[maxLights];
|
||||
this.lightPositionsParam = lightPositionsParam;
|
||||
this.lightColorsParam = lightColorsParam;
|
||||
}
|
||||
|
||||
public PointLight this[int i]
|
||||
{
|
||||
get
|
||||
{
|
||||
var color = colors[i] / intensities[i];
|
||||
return new PointLight(
|
||||
positions[i],
|
||||
new Color(
|
||||
color.X,
|
||||
color.Y,
|
||||
color.Z,
|
||||
1f
|
||||
),
|
||||
intensities[i]
|
||||
);
|
||||
}
|
||||
set
|
||||
{
|
||||
positions[i] = value.Position;
|
||||
colors[i] = value.Color.ToVector3() * value.Intensity;
|
||||
intensities[i] = value.Intensity;
|
||||
lightPositionsParam.SetValue(positions);
|
||||
lightColorsParam.SetValue(colors);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -18,6 +18,9 @@
|
|||
<EmbeddedResource Include="Effects\FXB\GBufferEffect.fxb">
|
||||
<LogicalName>Kav.Resources.GBufferEffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
<EmbeddedResource Include="Effects\FXB\DeferredPBREffect.fxb">
|
||||
<LogicalName>Kav.Resources.DeferredPBREffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
<EmbeddedResource Include="Effects\FXB\PBREffect.fxb">
|
||||
<LogicalName>Kav.Resources.PBREffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
|
|
|
|||
|
|
@ -18,6 +18,9 @@
|
|||
<EmbeddedResource Include="Effects\FXB\GBufferEffect.fxb">
|
||||
<LogicalName>Kav.Resources.GBufferEffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
<EmbeddedResource Include="Effects\FXB\DeferredPBREffect.fxb">
|
||||
<LogicalName>Kav.Resources.DeferredPBREffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
<EmbeddedResource Include="Effects\FXB\PBREffect.fxb">
|
||||
<LogicalName>Kav.Resources.PBREffect.fxb</LogicalName>
|
||||
</EmbeddedResource>
|
||||
|
|
|
|||
55
Renderer.cs
55
Renderer.cs
|
|
@ -17,10 +17,11 @@ namespace Kav
|
|||
private RenderTarget2D gNormal { get; }
|
||||
private RenderTarget2D gAlbedo { get; }
|
||||
private RenderTarget2D gMetallicRoughness { get; }
|
||||
private RenderTarget2D deferredRenderTarget { get; }
|
||||
|
||||
private RenderTargetBinding[] GBuffer { get; }
|
||||
|
||||
private GBufferEffect GBufferEffect { get; }
|
||||
private DeferredPBREffect DeferredPBREffect { get; }
|
||||
|
||||
private SpriteBatch SpriteBatch { get; }
|
||||
|
||||
|
|
@ -35,7 +36,7 @@ namespace Kav
|
|||
renderDimensionsX,
|
||||
renderDimensionsY,
|
||||
false,
|
||||
SurfaceFormat.Color,
|
||||
SurfaceFormat.HalfSingle, // unused
|
||||
DepthFormat.Depth24
|
||||
);
|
||||
|
||||
|
|
@ -44,8 +45,8 @@ namespace Kav
|
|||
renderDimensionsX,
|
||||
renderDimensionsY,
|
||||
false,
|
||||
SurfaceFormat.Color,
|
||||
DepthFormat.None
|
||||
SurfaceFormat.Vector4,
|
||||
DepthFormat.Depth24
|
||||
);
|
||||
|
||||
gNormal = new RenderTarget2D(
|
||||
|
|
@ -53,7 +54,7 @@ namespace Kav
|
|||
renderDimensionsX,
|
||||
renderDimensionsY,
|
||||
false,
|
||||
SurfaceFormat.Color,
|
||||
SurfaceFormat.Vector4,
|
||||
DepthFormat.None
|
||||
);
|
||||
|
||||
|
|
@ -71,7 +72,7 @@ namespace Kav
|
|||
renderDimensionsX,
|
||||
renderDimensionsY,
|
||||
false,
|
||||
SurfaceFormat.Color,
|
||||
SurfaceFormat.HalfVector2,
|
||||
DepthFormat.None
|
||||
);
|
||||
|
||||
|
|
@ -82,9 +83,23 @@ namespace Kav
|
|||
new RenderTargetBinding(gMetallicRoughness)
|
||||
};
|
||||
|
||||
deferredRenderTarget = new RenderTarget2D(
|
||||
GraphicsDevice,
|
||||
renderDimensionsX,
|
||||
renderDimensionsY
|
||||
);
|
||||
|
||||
SimpleDepthEffect = new SimpleDepthEffect(GraphicsDevice);
|
||||
DeferredPBREffect = new DeferredPBREffect(GraphicsDevice);
|
||||
|
||||
SpriteBatch = new SpriteBatch(GraphicsDevice);
|
||||
|
||||
Texture2D whitePixel = new Texture2D(GraphicsDevice, 1, 1);
|
||||
whitePixel.SetData(new[] { Color.White });
|
||||
|
||||
GraphicsDevice.SetRenderTarget(deferredRenderTarget);
|
||||
graphicsDevice.Clear(Color.White);
|
||||
GraphicsDevice.SetRenderTarget(null);
|
||||
}
|
||||
|
||||
public void DeferredRender(
|
||||
|
|
@ -94,7 +109,9 @@ namespace Kav
|
|||
IEnumerable<DirectionalLight> directionalLights
|
||||
) {
|
||||
GraphicsDevice.SetRenderTargets(GBuffer);
|
||||
GraphicsDevice.Clear(Color.Black);
|
||||
GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Black, 1f, 0);
|
||||
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
|
||||
GraphicsDevice.BlendState = BlendState.Opaque;
|
||||
|
||||
foreach (var (model, transform) in modelTransforms)
|
||||
{
|
||||
|
|
@ -130,12 +147,24 @@ namespace Kav
|
|||
}
|
||||
|
||||
GraphicsDevice.SetRenderTarget(null);
|
||||
GraphicsDevice.Clear(Color.Black);
|
||||
SpriteBatch.Begin(SpriteSortMode.Deferred, null, null, null, null);
|
||||
SpriteBatch.Draw(gPosition, new Rectangle(0, 0, 640, 360), Color.White);
|
||||
SpriteBatch.Draw(gAlbedo, new Rectangle(640, 0, 640, 360), Color.White);
|
||||
SpriteBatch.Draw(gNormal, new Rectangle(0, 360, 640, 360), Color.White);
|
||||
SpriteBatch.Draw(gMetallicRoughness, new Rectangle(640, 360, 640, 360), Color.White);
|
||||
GraphicsDevice.Clear(Color.CornflowerBlue);
|
||||
|
||||
DeferredPBREffect.GPosition = gPosition;
|
||||
DeferredPBREffect.GAlbedo = gAlbedo;
|
||||
DeferredPBREffect.GNormal = gNormal;
|
||||
DeferredPBREffect.GMetallicRoughness = gMetallicRoughness;
|
||||
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++;
|
||||
}
|
||||
|
||||
SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, null, null, null, DeferredPBREffect);
|
||||
SpriteBatch.Draw(deferredRenderTarget, Vector2.Zero, Color.White);
|
||||
SpriteBatch.End();
|
||||
}
|
||||
|
||||
|
|
|
|||
14
Resources.cs
14
Resources.cs
|
|
@ -15,6 +15,19 @@ namespace Kav
|
|||
return gBufferEffect;
|
||||
}
|
||||
}
|
||||
|
||||
public static byte[] DeferredPBREffect
|
||||
{
|
||||
get
|
||||
{
|
||||
if (deferredPBREffect == null)
|
||||
{
|
||||
deferredPBREffect = GetResource("DeferredPBREffect");
|
||||
}
|
||||
return deferredPBREffect;
|
||||
}
|
||||
}
|
||||
|
||||
public static byte[] PBREffect
|
||||
{
|
||||
get
|
||||
|
|
@ -40,6 +53,7 @@ namespace Kav
|
|||
}
|
||||
|
||||
private static byte[] gBufferEffect;
|
||||
private static byte[] deferredPBREffect;
|
||||
private static byte[] pbrEffect;
|
||||
private static byte[] simpleDepthEffect;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue