void SetShadow(ScriptableRenderContext context, Camera camera)
{
if (camera.cameraType != CameraType.Game)
{
return;
}
int lightIndex = -1;
for (int i = 0; i < cullingResults.visibleLights.Length; ++i)
{
VisibleLight curLight = cullingResults.visibleLights[i];
if (curLight.lightType != LightType.Directional)
{
continue;
}
if (curLight.light.shadows == LightShadows.None)
{
continue;
}
if (curLight.light.shadowStrength <= 0f)
{
continue;
}
Bounds bounds;
if (cullingResults.GetShadowCasterBounds(i, out bounds) == false)
{
continue;
}
lightIndex = i;
break;
}
if (lightIndex < 0)
{
CmdBuff.SetGlobalTexture(ShadowMapID, Texture2D.whiteTexture);
context.ExecuteCommandBuffer(CmdBuff);
CmdBuff.Clear();
return;
}
CmdBuff.SetGlobalFloat(ShadowBiasID, cullingResults.visibleLights[lightIndex].light.shadowBias);
CmdBuff.SetGlobalFloat(ShadowStrengthID, cullingResults.visibleLights[lightIndex].light.shadowStrength);
CmdBuff.SetGlobalVector(ShadowMapSizeID, new Vector4(invShadowMapSize, invShadowMapSize, shadowMapSize, shadowMapSize));
if (cullingResults.visibleLights[lightIndex].light.shadows == LightShadows.Soft)
{
CmdBuff.EnableShaderKeyword("_SHADOWS_SOFT");
}
else
{
CmdBuff.DisableShaderKeyword("_SHADOWS_SOFT");
}
Matrix4x4 viewMatrix;
Matrix4x4 projMatrix;
ShadowSplitData shadowSplitData;
bool res = cullingResults.ComputeDirectionalShadowMatricesAndCullingPrimitives(
lightIndex, // int activeLightIndex,
0, // int splitIndex,
1, // int splitCount,
new Vector3(1.0f, 0.0f, 0.0f), // Vector3 splitRatio,
(int)setting.shadow.atlasSize, // int shadowResolution,
QualitySettings.shadowNearPlaneOffset, // float shadowNearPlaneOffset,
out viewMatrix, // out Matrix4x4 viewMatrix,
out projMatrix, // out Matrix4x4 projMatrix,
out shadowSplitData // out Experimental.Rendering.ShadowSplitData shadowSplitData
);
if (res == false)
{
CmdBuff.SetGlobalTexture(ShadowMapID, Texture2D.whiteTexture);
context.ExecuteCommandBuffer(CmdBuff);
CmdBuff.Clear();
return;
}
CoreUtils.SetRenderTarget(CmdBuff, renderBuffers[3], RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, ClearFlag.Depth);
CmdBuff.SetViewProjectionMatrices(viewMatrix, projMatrix);
context.ExecuteCommandBuffer(CmdBuff);
CmdBuff.Clear();
ShadowDrawingSettings shadowDrawingSettings = new ShadowDrawingSettings(cullingResults, lightIndex);
shadowDrawingSettings.splitData = shadowSplitData;
context.DrawShadows(ref shadowDrawingSettings);
// https://docs.unity3d.com/2019.2/Documentation/Manual/SL-PlatformDifferences.html
if (SystemInfo.usesReversedZBuffer)
{
projMatrix.m20 = -projMatrix.m20;
projMatrix.m21 = -projMatrix.m21;
projMatrix.m22 = -projMatrix.m22;
projMatrix.m23 = -projMatrix.m23;
}
// [-1,1] remap to [0, 1]
var scaleOffset = Matrix4x4.identity;
scaleOffset.m00 = scaleOffset.m11 = scaleOffset.m22 = 0.5f;
scaleOffset.m03 = scaleOffset.m13 = scaleOffset.m23 = 0.5f;
CmdBuff.SetGlobalTexture(ShadowMapID, renderBuffers[3]);
CmdBuff.SetGlobalMatrix(ShadowMatrixID, scaleOffset * (projMatrix * viewMatrix));
context.ExecuteCommandBuffer(CmdBuff);
CmdBuff.Clear();
}