private void VolumeLightMgr_PreRenderEvent(VolumeLightMgr renderer, Matrix4x4 viewProj)
{
if (_light == null || _shadowCommandBuffer == null)
{
return;
}
_material.SetVector("_CameraForward", VolumeLightMgr.Instance._camera.transform.forward);
_material.SetInt("_SampleCount", sampleCount);
_material.SetFloat("_Bias", depthBias);
_material.SetVector("_MieG", new Vector4(1 - (MieG * MieG), 1 + (MieG * MieG), 2 * MieG, 1.0f / (4.0f * Mathf.PI)));
_material.SetVector("_VolumetricLight", new Vector4(ScatteringCoef, ExtinctionCoef, _light.range, 1.0f - SkyboxExtinctionCoef));
//_material.SetVector("_LightPos", new Vector4(this.transform.position.x, this.transform.position.y, this.transform.position.z, 1));
_material.SetTexture("_CameraDepthTexture", renderer.GetVolumeLightDepthBuffer());
_material.SetVector("_halfResolution", new Vector2(renderer.GetVolumeLightBuffer().width, renderer.GetVolumeLightBuffer().height) / 2);
_material.SetFloat("_Strength", strength);
_material.SetFloat("_Fallback", fallback);
SetupSpotLight(renderer, viewProj);
}
//public Mesh SpotLightMesh;
private void SetupSpotLight(VolumeLightMgr renderer, Matrix4x4 viewProj)
{
_shadowCommandBuffer.Clear();
//如果CustomLightDepthTex不为空，就使用指定的DepthTex，否则使用unity灯光自带的
if (useCustomLightDepthMap)
{
_material.SetTexture("_LightDepthTexture", customLightDepthTex);
}
else
{
//拷贝depth map
RenderTargetIdentifier shadowmap = BuiltinRenderTextureType.CurrentActive;
//设置当前深度图的采样模式
_shadowCommandBuffer.SetShadowSamplingMode(shadowmap, ShadowSamplingMode.RawDepth);
_shadowCommandBuffer.SetGlobalTexture("_LightDepthTexture", shadowmap);
}
//------------------------------------------------------
int pass = GetCameraInSpotLightBounds(VolumeLightMgr.Instance._camera);
Mesh mesh = VolumeLightMgr.GetSpotLightMesh();
float scale = _light.range;
float angleScale = Mathf.Tan((_light.spotAngle + 1) * 0.5f * Mathf.Deg2Rad) * _light.range;
Matrix4x4 world = Matrix4x4.TRS(_light.transform.position, _light.transform.rotation, new Vector3(angleScale, angleScale, scale));
Matrix4x4 view = Matrix4x4.TRS(_light.transform.position, _light.transform.rotation, Vector3.one).inverse;
//NDC
Matrix4x4 clip = Matrix4x4.TRS(new Vector3(0.5f, 0.5f, 0.0f), Quaternion.identity, new Vector3(-0.5f, -0.5f, 1.0f));
Matrix4x4 proj = Matrix4x4.Perspective(_light.spotAngle, 1, 0, 1);
_material.SetMatrix("_MyLightMatrix0", clip * proj * view);
_material.SetMatrix("_WorldViewProj", viewProj * world);
_material.SetVector("_LightPos", new Vector4(_light.transform.position.x, _light.transform.position.y, _light.transform.position.z, 1.0f / (_light.range * _light.range)));
_material.SetVector("_LightColor", _light.color * _light.intensity);
Vector3 apex = _light.transform.position;
Vector3 axis = _light.transform.forward;
// plane equation ax + by + cz + d = 0; precompute d here to lighten the shader
Vector3 center = apex + axis * _light.range;
float d = -Vector3.Dot(center, axis);
_material.SetFloat("_PlaneD", d);
_material.SetFloat("_CosAngle", Mathf.Cos((_light.spotAngle + 1) * 0.5f * Mathf.Deg2Rad));
_material.SetVector("_ConeApex", new Vector4(apex.x, apex.y, apex.z));
_material.SetVector("_ConeAxis", new Vector4(axis.x, axis.y, axis.z));
_material.EnableKeyword("SPOT");
_material.DisableKeyword("NOISE");
if (_light.cookie == null)
{
_material.SetTexture("_LightCookieTex", VolumeLightMgr.GetDefaultSpotCookie());
}
else
{
_material.SetTexture("_LightCookieTex", _light.cookie);
}
clip = Matrix4x4.TRS(new Vector3(0.5f, 0.5f, 0.5f), Quaternion.identity, new Vector3(0.5f, 0.5f, 0.5f));
if (VolumeLightMgr._reversedZ)
{
proj = Matrix4x4.Perspective(_light.spotAngle, 1, _light.range, _light.shadowNearPlane);
_material.DisableKeyword("XIAO_MI");
}
else
{
proj = Matrix4x4.Perspective(_light.spotAngle, 1, _light.shadowNearPlane, _light.range);
if (Application.platform == RuntimePlatform.Android)
{
_material.EnableKeyword("XIAO_MI");
}
}
Matrix4x4 m = clip * proj;
m[0, 2] *= -1;
m[1, 2] *= -1;
m[2, 2] *= -1;
m[3, 2] *= -1;
//view = _light.transform.worldToLocalMatrix;
_material.SetMatrix("_MyWorld2Shadow", m * view);
_material.EnableKeyword("SHADOWS_DEPTH");
if (isNoise)
{
_material.SetTexture("_NoiseTex", noiseTex);
_material.SetVector("_NoiseVelocity", new Vector4(NoiseVelocity.x * 1.0f / NoiseScale.x, NoiseVelocity.y * 1.0f / NoiseScale.y));
_material.SetVector("_NoiseData", new Vector4(1.0f / NoiseScale.x, 1.0f / NoiseScale.y, NoiseIntensity, NoiseIntensityOffset));
_material.EnableKeyword("NOISE");
}
else
{
_material.DisableKeyword("NOISE");
}
if (contrast)
{
//_material.SetFloat("_Contrast", contrast);
_material.EnableKeyword("CONTRAST");
}
else
{
_material.DisableKeyword("CONTRAST");
}
_shadowCommandBuffer.SetRenderTarget(renderer.GetVolumeLightBuffer());
//_shadowCommandBuffer.ClearRenderTarget(false, true, Color.white);
_shadowCommandBuffer.DrawMesh(mesh, world, _material, 0, pass);
//if (CustomRenderEvent != null)
// CustomRenderEvent(renderer, this, _commandBuffer, viewProj);
}
