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basic directional light shadow mapping

shadows
cosmonaut 2020-08-27 14:46:20 -07:00
parent 4095b7eda5
commit 28bc8c79e7
8 changed files with 90 additions and 20 deletions
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10
Effects/DeferredPBREffect.cs
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@ -9,8 +9,11 @@ namespace Kav
EffectParameter gAlbedoParam;
EffectParameter gNormalParam;
EffectParameter gMetallicRoughnessParam;
EffectParameter shadowMapParam;
EffectParameter eyePositionParam;
EffectParameter lightSpaceMatrixParam;
PointLightCollection pointLightCollection;
DirectionalLightCollection directionalLightCollection;
@ -18,8 +21,10 @@ namespace Kav
public Texture2D GAlbedo { get; set; }
public Texture2D GNormal { get; set; }
public Texture2D GMetallicRoughness { get; set; }
public Texture2D ShadowMap { get; set; }
public Vector3 EyePosition { get; set; }
public Matrix LightSpaceMatrix { get; set; }
public int MaxPointLights { get; } = 64;
@ -95,8 +100,10 @@ namespace Kav
gAlbedoParam.SetValue(GAlbedo);
gNormalParam.SetValue(GNormal);
gMetallicRoughnessParam.SetValue(GMetallicRoughness);
shadowMapParam.SetValue(ShadowMap);
eyePositionParam.SetValue(EyePosition);
lightSpaceMatrixParam.SetValue(LightSpaceMatrix);
}
void CacheEffectParameters()
@ -105,8 +112,11 @@ namespace Kav
gAlbedoParam = Parameters["gAlbedo"];
gNormalParam = Parameters["gNormal"];
gMetallicRoughnessParam = Parameters["gMetallicRoughness"];
shadowMapParam = Parameters["shadowMap"];
eyePositionParam = Parameters["EyePosition"];
lightSpaceMatrixParam = Parameters["LightSpaceMatrix"];
}
}
}

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Effects/FXB/DeferredPBREffect.fxb
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Effects/FXB/SimpleDepthEffect.fxb
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37
Effects/HLSL/DeferredPBREffect.fx
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@ -8,6 +8,7 @@ DECLARE_TEXTURE(gPosition, 0);
DECLARE_TEXTURE(gAlbedo, 1);
DECLARE_TEXTURE(gNormal, 2);
DECLARE_TEXTURE(gMetallicRoughness, 3);
DECLARE_TEXTURE(shadowMap, 4); // TODO: one map per directional light
BEGIN_CONSTANTS
@ -21,6 +22,8 @@ BEGIN_CONSTANTS
MATRIX_CONSTANTS
float4x4 LightSpaceMatrix _ps(c137) _cb(c137);
END_CONSTANTS
struct PixelInput
@ -71,6 +74,24 @@ float GeometrySmith(float3 N, float3 V, float3 L, float roughness)
return ggx1 * ggx2;
}
float ComputeShadow(float4 positionLightSpace)
{
float bias = 0.01;
// maps to [-1, 1]
float3 projectionCoords = positionLightSpace.xyz / positionLightSpace.w;
// maps to [0, 1]
projectionCoords = (projectionCoords * 0.5) + 0.5;
float closestDepth = SAMPLE_TEXTURE(shadowMap, projectionCoords.xy).r;
float currentDepth = projectionCoords.z;
float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
return shadow;
}
float3 ComputeLight(
float3 lightDir,
float3 radiance,
@ -79,7 +100,8 @@ float3 ComputeLight(
float3 N,
float3 albedo,
float metallic,
float roughness
float roughness,
float shadow
) {
float3 L = normalize(lightDir);
float3 H = normalize(V + L);
@ -98,7 +120,7 @@ float3 ComputeLight(
kD *= 1.0 - metallic;
float NdotL = max(dot(N, L), 0.0);
return (kD * albedo / PI + specular) * radiance * NdotL;
return (kD * albedo / PI + specular) * radiance * NdotL * shadow;
}
float4 ComputeColor(
@ -108,6 +130,9 @@ float4 ComputeColor(
float metallic,
float roughness
) {
float4 positionLightSpace = mul(float4(worldPosition, 1.0), LightSpaceMatrix);
float shadow = ComputeShadow(positionLightSpace);
float3 V = normalize(EyePosition - worldPosition);
float3 N = normalize(worldNormal);
@ -124,7 +149,7 @@ float4 ComputeColor(
float attenuation = 1.0 / (distance * distance);
float3 radiance = PointLightColors[i] * attenuation;
Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness);
Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness, 1.0);
}
// directional light
@ -133,7 +158,7 @@ float4 ComputeColor(
float3 lightDir = DirectionalLightDirections[i];
float3 radiance = DirectionalLightColors[i];
Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness);
Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness, (1.0 - shadow));
}
float3 ambient = float3(0.03, 0.03, 0.03) * albedo; // * AO;
@ -148,13 +173,13 @@ float4 ComputeColor(
float4 main_ps(PixelInput input) : SV_TARGET0
{
float3 fragPosition = SAMPLE_TEXTURE(gPosition, input.TexCoord).rgb;
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(
fragPosition,
worldPosition,
normal,
albedo,
metallicRoughness.r,

14
Effects/HLSL/SimpleDepthEffect.fx
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@ -3,6 +3,8 @@
BEGIN_CONSTANTS
float4x4 ModelViewProjection _vs(c0) _cb(c0);
float near _vs(c4) _cb(c4);
float far _vs(c5) _cb(c5);
MATRIX_CONSTANTS
@ -16,21 +18,31 @@ struct VertexShaderInput
struct VertexShaderOutput
{
float4 Position : SV_Position;
float Depth : TEXCOORD0;
};
VertexShaderOutput main_vs(VertexShaderInput input)
{
VertexShaderOutput output;
output.Position = mul(float4(input.Position.xyz, 1.0), ModelViewProjection);
output.Position = mul(input.Position, ModelViewProjection);
output.Depth = output.Position.z / output.Position.w;
output.Depth = (output.Depth * 0.5) + 0.5;
return output;
}
float4 main_ps(VertexShaderOutput input) : SV_TARGET0
{
return float4(input.Depth, 0.0, 0.0, 0.0);
}
Technique SimpleDepth
{
Pass
{
VertexShader = compile vs_3_0 main_vs();
PixelShader = compile ps_3_0 main_ps();
}
}

11
Effects/SimpleDepthEffect.cs
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@ -6,6 +6,8 @@ namespace Kav
public class SimpleDepthEffect : Effect
{
EffectParameter modelViewProjectionParam;
EffectParameter nearParam;
EffectParameter farParam;
Matrix model;
Matrix view;
@ -42,6 +44,10 @@ namespace Kav
dirtyFlags |= EffectDirtyFlags.WorldViewProj;
}
}
public float Near { get; set; }
public float Far { get; set; }
public SimpleDepthEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.SimpleDepthEffect)
{
CacheEffectParameters();
@ -58,11 +64,16 @@ namespace Kav
dirtyFlags &= ~EffectDirtyFlags.WorldViewProj;
}
nearParam.SetValue(Near);
farParam.SetValue(Far);
}
private void CacheEffectParameters()
{
modelViewProjectionParam = Parameters["ModelViewProjection"];
nearParam = Parameters["near"];
farParam = Parameters["far"];
}
}
}

2
Lights/DirectionalLight.cs
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@ -12,7 +12,7 @@ namespace Kav
{
get
{
return Matrix.CreateLookAt(-Direction * 100f, Vector3.Zero, Vector3.Up);
return Matrix.CreateLookAt(Direction * 100f, Vector3.Zero, Vector3.Up);
}
}

34
Renderer.cs
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@ -36,7 +36,7 @@ namespace Kav
renderDimensionsX,
renderDimensionsY,
false,
SurfaceFormat.HalfSingle, // unused
SurfaceFormat.Single,
DepthFormat.Depth24
);
@ -105,6 +105,13 @@ namespace Kav
IEnumerable<PointLight> pointLights,
IEnumerable<DirectionalLight> directionalLights
) {
foreach (var directionalLight in directionalLights)
{
DepthRender(modelTransforms, directionalLight);
DeferredPBREffect.LightSpaceMatrix = directionalLight.View * directionalLight.Projection;
break; // FIXME: this is a kludge
}
GraphicsDevice.SetRenderTargets(GBuffer);
GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Black, 1f, 0);
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
@ -150,6 +157,7 @@ namespace Kav
DeferredPBREffect.GAlbedo = gAlbedo;
DeferredPBREffect.GNormal = gNormal;
DeferredPBREffect.GMetallicRoughness = gMetallicRoughness;
DeferredPBREffect.ShadowMap = DepthRenderTarget;
DeferredPBREffect.EyePosition = Matrix.Invert(camera.View).Translation;
int i = 0;
@ -173,23 +181,18 @@ namespace Kav
SpriteBatch.End();
}
public void Render(
Camera camera,
IEnumerable<(Model, Matrix)> modelTransforms,
IEnumerable<PointLight> pointLights,
IEnumerable<DirectionalLight> directionalLights
) {
Render(camera.View, camera.Projection, modelTransforms, pointLights, directionalLights);
}
// for shadow mapping
public void DepthRender(IEnumerable<(Model, Matrix)> modelTransforms, DirectionalLight directionalLight)
{
GraphicsDevice.SetRenderTarget(DepthRenderTarget);
GraphicsDevice.Clear(ClearOptions.DepthBuffer, Color.Black, 1, 0);
GraphicsDevice.Clear(Color.White);
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.BlendState = BlendState.Opaque;
SimpleDepthEffect.View = directionalLight.View;
SimpleDepthEffect.Projection = directionalLight.Projection;
SimpleDepthEffect.Near = 0.1f; // FIXME: this is a kludge
SimpleDepthEffect.Far = 200f;
foreach (var (model, transform) in modelTransforms)
{
@ -220,6 +223,15 @@ namespace Kav
}
}
public void Render(
Camera camera,
IEnumerable<(Model, Matrix)> modelTransforms,
IEnumerable<PointLight> pointLights,
IEnumerable<DirectionalLight> directionalLights
) {
Render(camera.View, camera.Projection, modelTransforms, pointLights, directionalLights);
}
private void Render(
Matrix view,
Matrix projection,