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

        private void ConvertVertexShaderCaps( RenderSystemCapabilities rsc )
        {
            var major = 0xFF;
            var minor = 0xFF;
            SlimDX.Direct3D9.Capabilities minVsCaps = null;

            // Find the device with the lowest vertex shader caps.
            foreach (var driver in _driverList)
            {
                var rkCurCaps = driver.D3D9DeviceCaps;
                var currMajor = rkCurCaps.VertexShaderVersion.Major;
                var currMinor = rkCurCaps.VertexShaderVersion.Minor;

                if (currMajor < major)    
                {
                    major = currMajor;
                    minor = currMinor;
                    minVsCaps = rkCurCaps;
                }
                else if (currMajor == major && currMinor < minor)
                {
                    minor = currMinor;
                    minVsCaps = rkCurCaps;
                }            
            }

        
            var vs2X = false;
            var vs2A = false;

            // Special case detection for vs_2_x/a support
            if (major >= 2)
            {
                if ((minVsCaps.VS20Caps.Caps & VertexShaderCaps.Predication) != 0 &&
                    (minVsCaps.VS20Caps.DynamicFlowControlDepth > 0) &&
                    (minVsCaps.VS20Caps.TempCount >= 12))
                {
                    vs2X = true;
                }

                if ((minVsCaps.VS20Caps.Caps & VertexShaderCaps.Predication) != 0 &&
                    (minVsCaps.VS20Caps.DynamicFlowControlDepth > 0) &&
                    (minVsCaps.VS20Caps.TempCount >= 13))
                {
                    vs2A = true;
                }
            }

            // Populate max param count
            switch (major)
            {
                case 1:
                    // No boolean params allowed
                    rsc.VertexProgramConstantBoolCount = 0;
                    // No integer params allowed
                    rsc.VertexProgramConstantIntCount = 0;
                    // float params, always 4D
                    rsc.VertexProgramConstantFloatCount = minVsCaps.MaxVertexShaderConstants;
                    break;
                case 2:
                    // 16 boolean params allowed
                    rsc.VertexProgramConstantBoolCount = 16;
                    // 16 integer params allowed, 4D
                    rsc.VertexProgramConstantIntCount = 16;
                    // float params, always 4D
                    rsc.VertexProgramConstantFloatCount = minVsCaps.MaxVertexShaderConstants;
                    break;
                case 3:
                    // 16 boolean params allowed
                    rsc.VertexProgramConstantBoolCount = 16;
                    // 16 integer params allowed, 4D
                    rsc.VertexProgramConstantIntCount = 16;
                    // float params, always 4D
                    rsc.VertexProgramConstantFloatCount = minVsCaps.MaxVertexShaderConstants;
                    break;
            }

            // populate syntax codes in program manager (no breaks in this one so it falls through)
            switch (major)
            {
                case 3:
                    rsc.AddShaderProfile( "vs_3_0" );
                    goto case 2;
                case 2:
                    if ( vs2X )
                        rsc.AddShaderProfile( "vs_2_x" );
                    if ( vs2A )
                        rsc.AddShaderProfile( "vs_2_a" );

                    rsc.AddShaderProfile( "vs_2_0" );
                    goto case 1;
                case 1:
                    rsc.AddShaderProfile( "vs_1_1" );
                    rsc.SetCapability( Graphics.Capabilities.VertexPrograms );
                    break;
            }
        }