void SetupMainLightShadowReceiverConstants(CommandBuffer cmd, VisibleLight shadowLight, bool supportsSoftShadows)
{
Light light = shadowLight.light;
bool softShadows = shadowLight.light.shadows == LightShadows.Soft && supportsSoftShadows;
int cascadeCount = m_ShadowCasterCascadesCount;
for (int i = 0; i < cascadeCount; ++i)
{
m_MainLightShadowMatrices[i] = m_CascadeSlices[i].shadowTransform;
}
// We setup and additional a no-op WorldToShadow matrix in the last index
// because the ComputeCascadeIndex function in Shadows.hlsl can return an index
// out of bounds. (position not inside any cascade) and we want to avoid branching
Matrix4x4 noOpShadowMatrix = Matrix4x4.zero;
noOpShadowMatrix.m22 = (SystemInfo.usesReversedZBuffer) ? 1.0f : 0.0f;
for (int i = cascadeCount; i <= k_MaxCascades; ++i)
{
m_MainLightShadowMatrices[i] = noOpShadowMatrix;
}
float invShadowAtlasWidth = 1.0f / renderTargetWidth;
float invShadowAtlasHeight = 1.0f / renderTargetHeight;
float invHalfShadowAtlasWidth = 0.5f * invShadowAtlasWidth;
float invHalfShadowAtlasHeight = 0.5f * invShadowAtlasHeight;
float softShadowsProp = softShadows ? 1.0f : 0.0f;
ShadowUtils.GetScaleAndBiasForLinearDistanceFade(m_MaxShadowDistanceSq, m_CascadeBorder, out float shadowFadeScale, out float shadowFadeBias);
cmd.SetGlobalTexture(m_MainLightShadowmap.id, m_MainLightShadowmapTexture);
cmd.SetGlobalMatrixArray(MainLightShadowConstantBuffer._WorldToShadow, m_MainLightShadowMatrices);
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowParams,
new Vector4(light.shadowStrength, softShadowsProp, shadowFadeScale, shadowFadeBias));
if (m_ShadowCasterCascadesCount > 1)
{
cmd.SetGlobalVector(MainLightShadowConstantBuffer._CascadeShadowSplitSpheres0,
m_CascadeSplitDistances[0]);
cmd.SetGlobalVector(MainLightShadowConstantBuffer._CascadeShadowSplitSpheres1,
m_CascadeSplitDistances[1]);
cmd.SetGlobalVector(MainLightShadowConstantBuffer._CascadeShadowSplitSpheres2,
m_CascadeSplitDistances[2]);
cmd.SetGlobalVector(MainLightShadowConstantBuffer._CascadeShadowSplitSpheres3,
m_CascadeSplitDistances[3]);
cmd.SetGlobalVector(MainLightShadowConstantBuffer._CascadeShadowSplitSphereRadii, new Vector4(
m_CascadeSplitDistances[0].w * m_CascadeSplitDistances[0].w,
m_CascadeSplitDistances[1].w * m_CascadeSplitDistances[1].w,
m_CascadeSplitDistances[2].w * m_CascadeSplitDistances[2].w,
m_CascadeSplitDistances[3].w * m_CascadeSplitDistances[3].w));
}
// Inside shader soft shadows are controlled through global keyword.
// If any additional light has soft shadows it will force soft shadows on main light too.
// As it is not trivial finding out which additional light has soft shadows, we will pass main light properties if soft shadows are supported.
// This workaround will be removed once we will support soft shadows per light.
if (supportsSoftShadows)
{
if (m_SupportsBoxFilterForShadows)
{
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowOffset0,
new Vector4(-invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowOffset1,
new Vector4(invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowOffset2,
new Vector4(-invHalfShadowAtlasWidth, invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowOffset3,
new Vector4(invHalfShadowAtlasWidth, invHalfShadowAtlasHeight, 0.0f, 0.0f));
}
// Currently only used when !SHADER_API_MOBILE but risky to not set them as it's generic
// enough so custom shaders might use it.
cmd.SetGlobalVector(MainLightShadowConstantBuffer._ShadowmapSize, new Vector4(invShadowAtlasWidth,
invShadowAtlasHeight,
renderTargetWidth, renderTargetHeight));
}
}