Protogame.Default3DDeferredRenderPass.BeginRenderPass C# (CSharp) Méthode

        public void BeginRenderPass(
            IGameContext gameContext,
            IRenderContext renderContext, 
            IRenderPass previousPass,      
            RenderTarget2D postProcessingSource)
        {
            _colorRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_colorRenderTarget, gameContext, SurfaceFormat.Color, DepthFormat.Depth24, null);
            _normalRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_normalRenderTarget, gameContext, SurfaceFormat.Color, DepthFormat.None, null);
            _depthRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_depthRenderTarget, gameContext, SurfaceFormat.Single, DepthFormat.None, null);
            _specularRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_specularRenderTarget, gameContext, SurfaceFormat.Color, DepthFormat.None, null);
            _diffuseLightRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_diffuseLightRenderTarget, gameContext, null, DepthFormat.None, null);
            _specularLightRenderTarget = _renderTargetBackBufferUtilities.UpdateCustomRenderTarget(_specularLightRenderTarget, gameContext, null, DepthFormat.None, null);

            if (_rasterizerStateCullNone == null)
            {
                _rasterizerStateCullNone = new RasterizerState();
                _rasterizerStateCullNone.CullMode = CullMode.None;
                _rasterizerStateCullNone.FillMode = FillMode.Solid;
                _rasterizerStateCullNone.DepthBias = 0;
                _rasterizerStateCullNone.MultiSampleAntiAlias = true;
                _rasterizerStateCullNone.ScissorTestEnable = false;
                _rasterizerStateCullNone.SlopeScaleDepthBias = 0;
                _rasterizerStateCullNone.DepthClipEnable = true;
            }

            if (_rasterizerStateCullClockwiseFace == null)
            {
                _rasterizerStateCullClockwiseFace = new RasterizerState();
                _rasterizerStateCullClockwiseFace.CullMode = CullMode.CullClockwiseFace;
                _rasterizerStateCullClockwiseFace.FillMode = FillMode.Solid;
                _rasterizerStateCullClockwiseFace.DepthBias = 0;
                _rasterizerStateCullClockwiseFace.MultiSampleAntiAlias = true;
                _rasterizerStateCullClockwiseFace.ScissorTestEnable = false;
                _rasterizerStateCullClockwiseFace.SlopeScaleDepthBias = 0;
                _rasterizerStateCullClockwiseFace.DepthClipEnable = true;
            }

            if (_rasterizerStateCullCounterClockwiseFace == null)
            {
                _rasterizerStateCullCounterClockwiseFace = new RasterizerState();
                _rasterizerStateCullCounterClockwiseFace.CullMode = CullMode.CullCounterClockwiseFace;
                _rasterizerStateCullCounterClockwiseFace.FillMode = FillMode.Solid;
                _rasterizerStateCullCounterClockwiseFace.DepthBias = 0;
                _rasterizerStateCullCounterClockwiseFace.MultiSampleAntiAlias = true;
                _rasterizerStateCullCounterClockwiseFace.ScissorTestEnable = false;
                _rasterizerStateCullCounterClockwiseFace.SlopeScaleDepthBias = 0;
                _rasterizerStateCullCounterClockwiseFace.DepthClipEnable = true;
            }

            if (_depthStencilState == null)
            {
                _depthStencilState = DepthStencilState.Default;
            }

            if (_lightDepthStencilState == null)
            {
                _lightDepthStencilState = DepthStencilState.None;
            }

            if (_blendState == null)
            {
                _blendState = BlendState.Opaque;
            }

            if (_lightBlendState == null)
            {
                _lightBlendState = BlendState.AlphaBlend;
            }

            renderContext.PushRenderTarget(
                _colorRenderTarget,
                _normalRenderTarget,
                _depthRenderTarget,
                _specularRenderTarget);

            // Clear the geometry buffer before moving into main rendering.
            _graphicsBlit.Blit(
                renderContext,
                null,
                null,
                _gbufferClearEffect.Effect);

            _previousDepthStencilState = renderContext.GraphicsDevice.DepthStencilState;
            _previousRasterizerState = renderContext.GraphicsDevice.RasterizerState;
            _previousBlendState = renderContext.GraphicsDevice.BlendState;

            renderContext.GraphicsDevice.DepthStencilState = _depthStencilState;
            renderContext.GraphicsDevice.RasterizerState = _rasterizerStateCullCounterClockwiseFace;
            renderContext.GraphicsDevice.BlendState = _blendState;
        }