Axiom.RenderSystems.DirectX9.D3DRenderSystem.Render C# (CSharp) Метод

        public override void Render( RenderOperation op )
        {
            // Exit immediately if there is nothing to render
            // This caused a problem on FireGL 8800
            if ( op.vertexData.vertexCount == 0 )
            {
                return;
            }

            base.Render( op );

            // To think about: possibly remove setVertexDeclaration and 
            // setVertexBufferBinding from RenderSystem since the sequence is
            // a bit too D3D9-specific?
            VertexDeclaration = op.vertexData.vertexDeclaration;
            // TODO: the false parameter has to be carried inside op as var
            SetVertexBufferBinding(op.vertexData.vertexBufferBinding, op.numberOfInstances, false, op.useIndices);

            // Determine rendering operation
            var primType = PrimitiveType.TriangleList;
            var lprimCount = op.vertexData.vertexCount;
            var cnt = op.useIndices && primType != PrimitiveType.PointList ? op.indexData.indexCount : op.vertexData.vertexCount;

            switch ( op.operationType )
            {
                case OperationType.TriangleList:
                    primType = PrimitiveType.TriangleList;
                    lprimCount = cnt / 3;
                    break;
                case OperationType.TriangleStrip:
                    primType = PrimitiveType.TriangleStrip;
                    lprimCount = cnt - 2;
                    break;
                case OperationType.TriangleFan:
                    primType = PrimitiveType.TriangleFan;
                    lprimCount = cnt - 2;
                    break;
                case OperationType.PointList:
                    primType = PrimitiveType.PointList;
                    lprimCount = cnt;
                    break;
                case OperationType.LineList:
                    primType = PrimitiveType.LineList;
                    lprimCount = cnt / 2;
                    break;
                case OperationType.LineStrip:
                    primType = PrimitiveType.LineStrip;
                    lprimCount = cnt - 1;
                    break;
            } // switch(primType)

            if (lprimCount == 0)
                return;


            if (op.useIndices)
            {
                var d3DIdxBuf = (D3DHardwareIndexBuffer)op.indexData.indexBuffer;
                ActiveD3D9Device.Indices = d3DIdxBuf.D3DIndexBuffer;
                do
                {
                    // Update derived depth bias
                    if (derivedDepthBias && currentPassIterationNum > 0)
                    {
                        SetDepthBias(derivedDepthBiasBase +
                            derivedDepthBiasMultiplier * currentPassIterationNum,
                            derivedDepthBiasSlopeScale);
                    }

                    // draw the indexed primitives
                    ActiveD3D9Device.DrawIndexedPrimitives(primType, 
                        op.vertexData.vertexStart, 
                        0, 
                        op.vertexData.vertexCount, 
                        op.indexData.indexStart, 
                        lprimCount);
                } while (UpdatePassIterationRenderState());
            }
            else
            {
                // nfz: gpu_iterate
                do
                {
                    // Update derived depth bias
                    if (derivedDepthBias && currentPassIterationNum > 0)
                    {
                        SetDepthBias(derivedDepthBiasBase +
                            derivedDepthBiasMultiplier * currentPassIterationNum,
                            derivedDepthBiasSlopeScale);
                    }
                    // Unindexed, a little simpler!
                    ActiveD3D9Device.DrawPrimitives(primType, op.vertexData.vertexStart, lprimCount);
                } while (UpdatePassIterationRenderState());
            }
        }