private void Update()
{
WPShadowSetting setting = GetCurrentSetting();
// Main camera maybe changed
m_mainCamera = Camera.main;
// Culling intersection with main camera
activeCullingMask = setting.cullingMask & (m_mainCamera ? m_mainCamera.cullingMask : 0);
if (activeCullingMask == 0 || setting.shadowIntensity <= 0.001f)
{
ClearShadow();
return;
}
UpdateShadowDepthMap(setting);
UpdateShadowMap(setting);
}
private void UpdateShadowDepthMap(WPShadowSetting setting)
{
int size = setting.resolution == 3 ? 2048 : (setting.resolution == 2 ? 1024 : 512);
if (size == m_shadowMapSize)
{
return;
}
if (m_shadowMap)
{
RenderTexture.ReleaseTemporary(m_shadowMap);
}
m_shadowMapSize = size;
m_shadowMap = RenderTexture.GetTemporary(size, size, 0, m_rtFormat);
m_shadowMap.filterMode = FilterMode.Point;
shadowCamera.targetTexture = m_shadowMap;
Shader.SetGlobalTexture(ID_WP_ShadowMap, m_shadowMap);
}
private void UpdateShadowMap(WPShadowSetting setting)
{
/*
* 0 1
* near
* 2 3
*/
float nearDistance = m_mainCamera.nearClipPlane;
float tanHalfFov = Mathf.Tan(m_mainCamera.fieldOfView * 0.5f * Mathf.Deg2Rad);
float nearHalfHeight = tanHalfFov * nearDistance;
float nearHalfWidth = nearHalfHeight * m_mainCamera.aspect;
float farHalfHeight = tanHalfFov * setting.shadowDistance;
float farHalfWidth = farHalfHeight * m_mainCamera.aspect;
m_frustumVertexs[0] = new Vector3(-nearHalfWidth, nearHalfHeight, nearDistance);
m_frustumVertexs[1] = new Vector3(nearHalfWidth, nearHalfHeight, nearDistance);
m_frustumVertexs[2] = new Vector3(-nearHalfWidth, -nearHalfHeight, nearDistance);
m_frustumVertexs[3] = new Vector3(nearHalfWidth, -nearHalfHeight, nearDistance);
m_frustumVertexs[4] = new Vector3(-farHalfWidth, farHalfHeight, setting.shadowDistance);
m_frustumVertexs[5] = new Vector3(farHalfWidth, farHalfHeight, setting.shadowDistance);
m_frustumVertexs[6] = new Vector3(-farHalfWidth, -farHalfHeight, setting.shadowDistance);
m_frustumVertexs[7] = new Vector3(farHalfWidth, -farHalfHeight, setting.shadowDistance);
Matrix4x4 viewToWorld = m_mainCamera.transform.localToWorldMatrix;
Matrix4x4 worldToLight = m_transLight.worldToLocalMatrix;
Matrix4x4 VL = worldToLight * viewToWorld;
for (int i = 0; i < 8; i++)
{
m_frustumVertexs[i] = VL.MultiplyPoint(m_frustumVertexs[i]);
}
float xMin = float.MaxValue, xMax = float.MinValue;
float yMin = float.MaxValue, yMax = float.MinValue;
float zMin = float.MaxValue, zMax = float.MinValue;
for (int i = 0; i < 8; i++)
{
Vector3 v = m_frustumVertexs[i];
xMin = Mathf.Min(xMin, v.x);
xMax = Mathf.Max(xMax, v.x);
yMin = Mathf.Min(yMin, v.y);
yMax = Mathf.Max(yMax, v.y);
zMin = Mathf.Min(zMin, v.z);
zMax = Mathf.Max(zMax, v.z);
}
m_transShadowCamera.localPosition = new Vector3((xMin + xMax) * 0.5f, (yMin + yMax) * 0.5f, 0);
shadowCamera.orthographicSize = Mathf.Max((xMax - xMin) * 0.5f, (yMax - yMin) * 0.5f);
shadowCamera.nearClipPlane = zMin;
shadowCamera.farClipPlane = zMax;
shadowCamera.cullingMask = activeCullingMask;
Matrix4x4 worldToView = shadowCamera.worldToCameraMatrix;
Matrix4x4 projection = GL.GetGPUProjectionMatrix(shadowCamera.projectionMatrix, false);
Matrix4x4 VPC = m_correction4x4 * projection * worldToView;
Shader.SetGlobalMatrix(ID_WP_MatrixV, worldToView);
Shader.SetGlobalMatrix(ID_WP_MatrixVPC, VPC);
Shader.SetGlobalVector(ID_WP_ControlParams, new Vector4(setting.shadowIntensity, (int)setting.antiAliasing, zMin, 1f / (zMax - zMin)));
shadowCamera.RenderWithShader(shadowMapShader, "RenderType");
}
