void SetupShadow(Light light, ref CullingResults cullResults, ref CShadowSetting shadowSetting, int visibleLightIndex)
{
if (visibleLightIndex < CShadowPass.MAX_SHADOW_DIRECTIONAL_LIGHT_COUNT &&
light.shadows != LightShadows.None && light.shadowStrength > 0f &&
cullResults.GetShadowCasterBounds(visibleLightIndex, out Bounds b)
)
{
lightShadowDatas.Add(new ShadowLightData(visibleLightIndex));
}
}
public void setupLight(ScriptableRenderContext context, ref CullingResults cullResults, ref CShadowSetting shadowSetting)
{
NativeArray <VisibleLight> lights = cullResults.visibleLights;
int lightCount = lights.Length;
for (int i = 0; i < lightCount; i++)
{
VisibleLight light = lights[i];
Vector4 attenuation = Vector4.zero;
if (light.lightType == LightType.Directional)
{
lightColors[i] = light.finalColor;
lightDirection[i] = -light.localToWorldMatrix.GetColumn(2);
lightColors[i].w = 0;
attenuation.w = 1;
SetupShadow(light.light, ref cullResults, ref shadowSetting, i);
}
else if (light.lightType == LightType.Point || light.lightType == LightType.Spot)
{
lightColors[i] = light.finalColor;
lightDirection[i] = light.localToWorldMatrix.GetColumn(3);
lightColors[i].w = 1;
//Light Fade Out Reference: https://catlikecoding.com/unity/tutorials/scriptable-render-pipeline/lights/
attenuation.x = 1f / Mathf.Max(0.000001f, light.range * light.range);
attenuation.w = 1;
if (light.lightType == LightType.Spot)
{
Vector4 v = light.localToWorldMatrix.GetColumn(2);
v *= -1;
v.w = 1;
lightSportDirection[i] = v;
//求出inner 和outer角度的cos
float outerRad = Mathf.Deg2Rad * 0.5f * light.spotAngle;
float cosOuter = Mathf.Cos(outerRad);
float outerTan = Mathf.Tan(outerRad);
float cosInner = Mathf.Cos(Mathf.Atan((46f / 64f) * outerTan));
float angleRange = Mathf.Max(cosInner - cosOuter, 0.001f);
attenuation.z = 1f / angleRange;
attenuation.w = -cosOuter * attenuation.z;
}
}
lightAttenuation[i] = attenuation;
}
lightCmd.SetGlobalInt(ShaderProperty.VISIBLE_LIGHT_COUNT, lightCount);
lightCmd.SetGlobalVectorArray(ShaderProperty.VISIBLE_LIGHT_COLOR, lightColors);
lightCmd.SetGlobalVectorArray(ShaderProperty.VISIBLE_LIGHT_DIRECTION, lightDirection);
lightCmd.SetGlobalVectorArray(ShaderProperty.VISIBLE_LIGHT_ATTENUATION, lightAttenuation);
lightCmd.SetGlobalVectorArray(ShaderProperty.VISIBLE_LIGHT_SPOT_DIRECTION, lightSportDirection);
context.ExecuteCommandBuffer(lightCmd);
lightCmd.Clear();
}
