低占用 快速近似抗锯齿 FXAA3_QUALITY_V3.11

/*============================================================================ NVIDIA FXAA 3.11 by TIMOTHY LOTTES ------------------------------------------------------------------------------ COPYRIGHT (C) 2010, 2011 NVIDIA CORPORATION. ALL RIGHTS RESERVED. ------------------------------------------------------------------------------ TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED *AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. ------------------------------------------------------------------------------ INTEGRATION CHECKLIST ------------------------------------------------------------------------------ (1.) In the shader source, setup defines for the desired configuration. When providing multiple shaders (for different presets), simply setup the defines differently in multiple files. Example, #define FXAA_PC 1 #define FXAA_HLSL_5 1 #define FXAA_QUALITY__PRESET 12 Or, #define FXAA_360 1 Or, #define FXAA_PS3 1 Etc. (2.) Then include this file, #include "Fxaa3_11.h" (3.) Then call the FXAA pixel shader from within your desired shader. Look at the FXAA Quality FxaaPixelShader() for docs on inputs. As for FXAA 3.11 all inputs for all shaders are the same to enable easy porting between platforms. return FxaaPixelShader(...); (4.) Insure pass prior to FXAA outputs RGBL (see next section). Or use, #define FXAA_GREEN_AS_LUMA 1 (5.) Setup engine to provide the following constants which are used in the FxaaPixelShader() inputs, FxaaFloat2 fxaaQualityRcpFrame, FxaaFloat4 fxaaConsoleRcpFrameOpt, FxaaFloat4 fxaaConsoleRcpFrameOpt2, FxaaFloat4 fxaaConsole360RcpFrameOpt2, FxaaFloat fxaaQualitySubpix, FxaaFloat fxaaQualityEdgeThreshold, FxaaFloat fxaaQualityEdgeThresholdMin, FxaaFloat fxaaConsoleEdgeSharpness, FxaaFloat fxaaConsoleEdgeThreshold, FxaaFloat fxaaConsoleEdgeThresholdMin, FxaaFloat4 fxaaConsole360ConstDir Look at the FXAA Quality FxaaPixelShader() for docs on inputs. (6.) Have FXAA vertex shader run as a full screen triangle, and output "pos" and "fxaaConsolePosPos" such that inputs in the pixel shader provide, // {xy} = center of pixel FxaaFloat2 pos, // {xy__} = upper left of pixel // {__zw} = lower right of pixel FxaaFloat4 fxaaConsolePosPos, (7.) Insure the texture sampler(s) used by FXAA are set to bilinear filtering. ------------------------------------------------------------------------------ INTEGRATION - RGBL AND COLORSPACE ------------------------------------------------------------------------------ FXAA3 requires RGBL as input unless the following is set, #define FXAA_GREEN_AS_LUMA 1 In which case the engine uses green in place of luma, and requires RGB input is in a non-linear colorspace. RGB should be LDR (low dynamic range). Specifically do FXAA after tonemapping. RGB data as returned by a texture fetch can be non-linear, or linear when FXAA_GREEN_AS_LUMA is not set. Note an "sRGB format" texture counts as linear, because the result of a texture fetch is linear data. Regular "RGBA8" textures in the sRGB colorspace are non-linear. If FXAA_GREEN_AS_LUMA is not set, luma must be stored in the alpha channel prior to running FXAA. This luma should be in a perceptual space (could be gamma 2.0). Example pass before FXAA where output is gamma 2.0 encoded, color.rgb = ToneMap(color.rgb); // linear color output color.rgb = sqrt(color.rgb); // gamma 2.0 color output return color; To use FXAA, color.rgb = ToneMap(color.rgb); // linear color output color.rgb = sqrt(color.rgb); // gamma 2.0 color output color.a = dot(color.rgb, FxaaFloat3(0.299, 0.587, 0.114)); // compute luma return color; Another example where output is linear encoded, say for instance writing to an sRGB formated render target, where the render target does the conversion back to sRGB after blending, color.rgb = ToneMap(color.rgb); // linear color output return color; To use FXAA, color.rgb = ToneMap(color.rgb); // linear color output color.a = sqrt(dot(color.rgb, FxaaFloat3(0.299, 0.587, 0.114))); // compute luma return color; Getting luma correct is required for the algorithm to work correctly. ------------------------------------------------------------------------------ BEING LINEARLY CORRECT? ------------------------------------------------------------------------------ Applying FXAA to a framebuffer with linear RGB color will look worse. This is very counter intuitive, but happends to be true in this case. The reason is because dithering artifacts will be more visiable in a linear colorspace. ------------------------------------------------------------------------------ COMPLEX INTEGRATION ------------------------------------------------------------------------------ Q. What if the engine is blending into RGB before wanting to run FXAA? A. In the last opaque pass prior to FXAA, have the pass write out luma into alpha. Then blend into RGB only. FXAA should be able to run ok assuming the blending pass did not any add aliasing. This should be the common case for particles and common blending passes. A. Or use FXAA_GREEN_AS_LUMA. ============================================================================*/ /*============================================================================ INTEGRATION KNOBS ============================================================================*/ // // FXAA_PS3 and FXAA_360 choose the console algorithm (FXAA3 CONSOLE). // FXAA_360_OPT is a prototype for the new optimized 360 version. // // 1 = Use API. // 0 = Don't use API. // /*--------------------------------------------------------------------------*/ #ifndef FXAA_PS3 #define FXAA_PS3 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_360 #define FXAA_360 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_360_OPT #define FXAA_360_OPT 0 #endif /*==========================================================================*/ #ifndef FXAA_PC // // FXAA Quality // The high quality PC algorithm. // #define FXAA_PC 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_PC_CONSOLE // // The console algorithm for PC is included // for developers targeting really low spec machines. // Likely better to just run FXAA_PC, and use a really low preset. // #define FXAA_PC_CONSOLE 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_GLSL_120 #define FXAA_GLSL_120 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_GLSL_130 #define FXAA_GLSL_130 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_HLSL_3 #define FXAA_HLSL_3 0 #endif /*--------------------------------------------------------------------------*/ #ifndef FXAA_HLSL_4 #define FXAA_HLSL_4 0 #endif