void MultiResLayer::CreateDepthDerivativeMipMap(CameraPtr const & vp_camera)
{
gbuffer_to_depth_derivate_pp_->InputPin(0, g_buffer_rt0_tex_);
gbuffer_to_depth_derivate_pp_->InputPin(1, g_buffer_depth_tex_);
gbuffer_to_depth_derivate_pp_->OutputPin(0, depth_deriative_tex_);
float delta_x = 1.0f / g_buffer_rt0_tex_->Width(0);
float delta_y = 1.0f / g_buffer_rt0_tex_->Height(0);
float4 delta_offset(delta_x, delta_y, delta_x / 2, delta_y / 2);
gbuffer_to_depth_derivate_pp_->SetParam(0, delta_offset);
gbuffer_to_depth_derivate_pp_->SetParam(1, float2(vp_camera->FarPlane(), 1.0f / vp_camera->FarPlane()));
gbuffer_to_depth_derivate_pp_->Apply();
depth_derivate_mipmap_pp_->InputPin(0, depth_deriative_tex_);
for (uint32_t i = 1; i < depth_deriative_tex_->NumMipMaps(); ++ i)
{
int width = depth_deriative_tex_->Width(i - 1);
int height = depth_deriative_tex_->Height(i - 1);
delta_x = 1.0f / width;
delta_y = 1.0f / height;
delta_offset = float4(delta_x, delta_y, delta_x / 2, delta_y / 2);
depth_derivate_mipmap_pp_->SetParam(0, delta_offset);
depth_derivate_mipmap_pp_->SetParam(1, float2(vp_camera->FarPlane(), 1.0f / vp_camera->FarPlane()));
depth_derivate_mipmap_pp_->OutputPin(0, depth_deriative_small_tex_, i - 1);
depth_derivate_mipmap_pp_->Apply();
depth_deriative_small_tex_->CopyToSubTexture2D(*depth_deriative_tex_, 0, i, 0, 0, width / 2, height / 2,
0, i - 1, 0, 0, width / 2, height / 2);
}
}
void MultiResSILLayer::ExtractVPLs(CameraPtr const & rsm_camera, LightSourcePtr const & light)
{
rsm_texs_[0]->BuildMipSubLevels();
rsm_texs_[1]->BuildMipSubLevels();
rsm_to_depth_derivate_pp_->Apply();
float4x4 ls_to_es = rsm_camera->InverseViewMatrix() * g_buffer_camera_->ViewMatrix();
float4x4 const & inv_proj = rsm_camera->InverseProjMatrix();
LightSource::LightType type = light->Type();
float4 vpl_params(static_cast<float>(VPL_COUNT), 2.0f,
static_cast<float>(MIN_RSM_MIPMAP_SIZE), static_cast<float>(MIN_RSM_MIPMAP_SIZE * MIN_RSM_MIPMAP_SIZE));
rsm_to_vpls_pps_[type]->SetParam(0, ls_to_es);
rsm_to_vpls_pps_[type]->SetParam(1, vpl_params);
rsm_to_vpls_pps_[type]->SetParam(2, light->Color());
rsm_to_vpls_pps_[type]->SetParam(3, light->CosOuterInner());
rsm_to_vpls_pps_[type]->SetParam(4, light->Falloff());
rsm_to_vpls_pps_[type]->SetParam(5, g_buffer_camera_->InverseViewMatrix());
float3 upper_left = MathLib::transform_coord(float3(-1, +1, 1), inv_proj);
float3 upper_right = MathLib::transform_coord(float3(+1, +1, 1), inv_proj);
float3 lower_left = MathLib::transform_coord(float3(-1, -1, 1), inv_proj);
rsm_to_vpls_pps_[type]->SetParam(6, upper_left);
rsm_to_vpls_pps_[type]->SetParam(7, upper_right - upper_left);
rsm_to_vpls_pps_[type]->SetParam(8, lower_left - upper_left);
rsm_to_vpls_pps_[type]->SetParam(9, int2(1, 0));
rsm_to_vpls_pps_[type]->SetParam(10, 0.12f * rsm_camera->FarPlane());
rsm_to_vpls_pps_[type]->SetParam(11, static_cast<float>(rsm_texs_[0]->NumMipMaps() - 1));
rsm_to_vpls_pps_[type]->Apply();
}
void MultiResLayer::SetSubsplatStencil(CameraPtr const & vp_camera)
{
*subsplat_depth_deriv_tex_param_ = depth_deriative_tex_;
*subsplat_normal_cone_tex_param_ = normal_cone_tex_;
*subsplat_depth_normal_threshold_param_ = float2(0.001f * vp_camera->FarPlane(), 0.77f);
*subsplat_far_plane_param_ = float2(vp_camera->FarPlane(), 1.0f / vp_camera->FarPlane());
RenderEngine& re = Context::Instance().RenderFactoryInstance().RenderEngineInstance();
for (size_t i = 0; i < multi_res_fbs_.size(); ++ i)
{
re.BindFrameBuffer(multi_res_fbs_[i]);
multi_res_fbs_[i]->Clear(FrameBuffer::CBM_Color | FrameBuffer::CBM_Depth | FrameBuffer::CBM_Stencil, Color(0, 0, 0, 0), 0.0f, 128);
*subsplat_cur_lower_level_param_ = int2(static_cast<int>(i), static_cast<int>(i + 1));
*subsplat_is_not_first_last_level_param_ = int2(i > 0, i < multi_res_fbs_.size() - 1);
re.Render(*subsplat_stencil_tech_, *rl_quad_);
}
}
