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slang-shaders/anti-aliasing/shaders/smaa/smaa-common.h
hunterk b8ce1d7a9d add SMAA shader
2016-10-31 11:01:11 -05:00

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/**
* Copyright (C) 2013 Jorge Jimenez (jorge@iryoku.com)
* Copyright (C) 2013 Jose I. Echevarria (joseignacioechevarria@gmail.com)
* Copyright (C) 2013 Belen Masia (bmasia@unizar.es)
* Copyright (C) 2013 Fernando Navarro (fernandn@microsoft.com)
* Copyright (C) 2013 Diego Gutierrez (diegog@unizar.es)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to
* do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software. As clarification, there
* is no requirement that the copyright notice and permission be included in
* binary distributions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define SMAA_GLSL_4
#define SMAA_PRESET_HIGH
//#include "SMAA.h"
#define SMAA_RT_METRICS vec4(params.SourceSize.z, params.SourceSize.w, params.SourceSize.x, params.SourceSize.y)
/**
* _______ ___ ___ ___ ___
* / || \/ | / \ / \
* | (---- | \ / | / ^ \ / ^ \
* \ \ | |\/| | / /_\ \ / /_\ \
* ----) | | | | | / _____ \ / _____ \
* |_______/ |__| |__| /__/ \__\ /__/ \__\
*
* E N H A N C E D
* S U B P I X E L M O R P H O L O G I C A L A N T I A L I A S I N G
*
* http://www.iryoku.com/smaa/
*
* Hi, welcome aboard!
*
* Here you'll find instructions to get the shader up and running as fast as
* possible.
*
* IMPORTANTE NOTICE: when updating, remember to update both this file and the
* precomputed textures! They may change from version to version.
*
* The shader has three passes, chained together as follows:
*
* |input|------------------?
* v |
* [ SMAA*EdgeDetection ] |
* v |
* |edgesTex| |
* v |
* [ SMAABlendingWeightCalculation ] |
* v |
* |blendTex| |
* v |
* [ SMAANeighborhoodBlending ] <------?
* v
* |output|
*
* Note that each [pass] has its own vertex and pixel shader. Remember to use
* oversized triangles instead of quads to avoid overshading along the
* diagonal.
*
* You've three edge detection methods to choose from: luma, color or depth.
* They represent different quality/performance and anti-aliasing/sharpness
* tradeoffs, so our recommendation is for you to choose the one that best
* suits your particular scenario:
*
* - Depth edge detection is usually the fastest but it may miss some edges.
*
* - Luma edge detection is usually more expensive than depth edge detection,
* but catches visible edges that depth edge detection can miss.
*
* - Color edge detection is usually the most expensive one but catches
* chroma-only edges.
*
* For quickstarters: just use luma edge detection.
*
* The general advice is to not rush the integration process and ensure each
* step is done correctly (don't try to integrate SMAA T2x with predicated edge
* detection from the start!). Ok then, let's go!
*
* 1. The first step is to create two RGBA temporal render targets for holding
* |edgesTex| and |blendTex|.
*
* In DX10 or DX11, you can use a RG render target for the edges texture.
* In the case of NVIDIA GPUs, using RG render targets seems to actually be
* slower.
*
* On the Xbox 360, you can use the same render target for resolving both
* |edgesTex| and |blendTex|, as they aren't needed simultaneously.
*
* 2. Both temporal render targets |edgesTex| and |blendTex| must be cleared
* each frame. Do not forget to clear the alpha channel!
*
* 3. The next step is loading the two supporting precalculated textures,
* 'areaTex' and 'searchTex'. You'll find them in the 'Textures' folder as
* C++ headers, and also as regular DDS files. They'll be needed for the
* 'SMAABlendingWeightCalculation' pass.
*
* If you use the C++ headers, be sure to load them in the format specified
* inside of them.
*
* You can also compress 'areaTex' and 'searchTex' using BC5 and BC4
* respectively, if you have that option in your content processor pipeline.
* When compressing then, you get a non-perceptible quality decrease, and a
* marginal performance increase.
*
* 4. All samplers must be set to linear filtering and clamp.
*
* After you get the technique working, remember that 64-bit inputs have
* half-rate linear filtering on GCN.
*
* If SMAA is applied to 64-bit color buffers, switching to point filtering
* when accesing them will increase the performance. Search for
* 'SMAASamplePoint' to see which textures may benefit from point
* filtering, and where (which is basically the color input in the edge
* detection and resolve passes).
*
* 5. All texture reads and buffer writes must be non-sRGB, with the exception
* of the input read and the output write in
* 'SMAANeighborhoodBlending' (and only in this pass!). If sRGB reads in
* this last pass are not possible, the technique will work anyway, but
* will perform antialiasing in gamma space.
*
* IMPORTANT: for best results the input read for the color/luma edge
* detection should *NOT* be sRGB.
*
* 6. Before including SMAA.h you'll have to setup the render target metrics,
* the target and any optional configuration defines. Optionally you can
* use a preset.
*
* You have the following targets available:
* SMAA_HLSL_3
* SMAA_HLSL_4
* SMAA_HLSL_4_1
* SMAA_GLSL_3 *
* SMAA_GLSL_4 *
*
* * (See SMAA_INCLUDE_VS and SMAA_INCLUDE_PS below).
*
* And four presets:
* SMAA_PRESET_LOW (%60 of the quality)
* SMAA_PRESET_MEDIUM (%80 of the quality)
* SMAA_PRESET_HIGH (%95 of the quality)
* SMAA_PRESET_ULTRA (%99 of the quality)
*
* For example:
* #define SMAA_RT_METRICS vec4(1.0 / 1280.0, 1.0 / 720.0, 1280.0, 720.0)
* #define SMAA_GLSL_4
* #define SMAA_PRESET_HIGH
* #include "SMAA.h"
*
* Note that SMAA_RT_METRICS doesn't need to be a macro, it can be a
* uniform variable. The code is designed to minimize the impact of not
* using a constant value, but it is still better to hardcode it.
*
* Depending on how you encoded 'areaTex' and 'searchTex', you may have to
* add (and customize) the following defines before including SMAA.h:
* #define SMAA_AREATEX_SELECT(sample) sample.rg
* #define SMAA_SEARCHTEX_SELECT(sample) sample.r
*
* If your engine is already using porting macros, you can define
* SMAA_CUSTOM_SL, and define the porting functions by yourself.
*
* 7. Then, you'll have to setup the passes as indicated in the scheme above.
* You can take a look into SMAA.fx, to see how we did it for our demo.
* Checkout the function wrappers, you may want to copy-paste them!
*
* 8. It's recommended to validate the produced |edgesTex| and |blendTex|.
* You can use a screenshot from your engine to compare the |edgesTex|
* and |blendTex| produced inside of the engine with the results obtained
* with the reference demo.
*
* 9. After you get the last pass to work, it's time to optimize. You'll have
* to initialize a stencil buffer in the first pass (discard is already in
* the code), then mask execution by using it the second pass. The last
* pass should be executed in all pixels.
*
*
* After this point you can choose to enable predicated thresholding,
* temporal supersampling and motion blur integration:
*
* a) If you want to use predicated thresholding, take a look into
* SMAA_PREDICATION; you'll need to pass an extra texture in the edge
* detection pass.
*
* b) If you want to enable temporal supersampling (SMAA T2x):
*
* 1. The first step is to render using subpixel jitters. I won't go into
* detail, but it's as simple as moving each vertex position in the
* vertex shader, you can check how we do it in our DX10 demo.
*
* 2. Then, you must setup the temporal resolve. You may want to take a look
* into SMAAResolve for resolving 2x modes. After you get it working, you'll
* probably see ghosting everywhere. But fear not, you can enable the
* CryENGINE temporal reprojection by setting the SMAA_REPROJECTION macro.
* Check out SMAA_DECODE_VELOCITY if your velocity buffer is encoded.
*
* 3. The next step is to apply SMAA to each subpixel jittered frame, just as
* done for 1x.
*
* 4. At this point you should already have something usable, but for best
* results the proper area textures must be set depending on current jitter.
* For this, the parameter 'subsampleIndices' of
* 'SMAABlendingWeightCalculationPS' must be set as follows, for our T2x
* mode:
*
* @SUBSAMPLE_INDICES
*
* | S# | Camera Jitter | subsampleIndices |
* +----+------------------+---------------------+
* | 0 | ( 0.25, -0.25) | float4(1, 1, 1, 0) |
* | 1 | (-0.25, 0.25) | float4(2, 2, 2, 0) |
*
* These jitter positions assume a bottom-to-top y axis. S# stands for the
* sample number.
*
* More information about temporal supersampling here:
* http://iryoku.com/aacourse/downloads/13-Anti-Aliasing-Methods-in-CryENGINE-3.pdf
*
* c) If you want to enable spatial multisampling (SMAA S2x):
*
* 1. The scene must be rendered using MSAA 2x. The MSAA 2x buffer must be
* created with:
* - DX10: see below (*)
* - DX10.1: D3D10_STANDARD_MULTISAMPLE_PATTERN or
* - DX11: D3D11_STANDARD_MULTISAMPLE_PATTERN
*
* This allows to ensure that the subsample order matches the table in
* @SUBSAMPLE_INDICES.
*
* (*) In the case of DX10, we refer the reader to:
* - SMAA::detectMSAAOrder and
* - SMAA::msaaReorder
*
* These functions allow to match the standard multisample patterns by
* detecting the subsample order for a specific GPU, and reordering
* them appropriately.
*
* 2. A shader must be run to output each subsample into a separate buffer
* (DX10 is required). You can use SMAASeparate for this purpose, or just do
* it in an existing pass (for example, in the tone mapping pass, which has
* the advantage of feeding tone mapped subsamples to SMAA, which will yield
* better results).
*
* 3. The full SMAA 1x pipeline must be run for each separated buffer, storing
* the results in the final buffer. The second run should alpha blend with
* the existing final buffer using a blending factor of 0.5.
* 'subsampleIndices' must be adjusted as in the SMAA T2x case (see point
* b).
*
* d) If you want to enable temporal supersampling on top of SMAA S2x
* (which actually is SMAA 4x):
*
* 1. SMAA 4x consists on temporally jittering SMAA S2x, so the first step is
* to calculate SMAA S2x for current frame. In this case, 'subsampleIndices'
* must be set as follows:
*
* | F# | S# | Camera Jitter | Net Jitter | subsampleIndices |
* +----+----+--------------------+-------------------+----------------------+
* | 0 | 0 | ( 0.125, 0.125) | ( 0.375, -0.125) | float4(5, 3, 1, 3) |
* | 0 | 1 | ( 0.125, 0.125) | (-0.125, 0.375) | float4(4, 6, 2, 3) |
* +----+----+--------------------+-------------------+----------------------+
* | 1 | 2 | (-0.125, -0.125) | ( 0.125, -0.375) | float4(3, 5, 1, 4) |
* | 1 | 3 | (-0.125, -0.125) | (-0.375, 0.125) | float4(6, 4, 2, 4) |
*
* These jitter positions assume a bottom-to-top y axis. F# stands for the
* frame number. S# stands for the sample number.
*
* 2. After calculating SMAA S2x for current frame (with the new subsample
* indices), previous frame must be reprojected as in SMAA T2x mode (see
* point b).
*
* e) If motion blur is used, you may want to do the edge detection pass
* together with motion blur. This has two advantages:
*
* 1. Pixels under heavy motion can be omitted from the edge detection process.
* For these pixels we can just store "no edge", as motion blur will take
* care of them.
* 2. The center pixel tap is reused.
*
* Note that in this case depth testing should be used instead of stenciling,
* as we have to write all the pixels in the motion blur pass.
*
* That's it!
*/
//-----------------------------------------------------------------------------
// SMAA Presets
/**
* Note that if you use one of these presets, the following configuration
* macros will be ignored if set in the "Configurable Defines" section.
*/
#if defined(SMAA_PRESET_LOW)
#define SMAA_THRESHOLD 0.15
#define SMAA_MAX_SEARCH_STEPS 4
#define SMAA_DISABLE_DIAG_DETECTION
#define SMAA_DISABLE_CORNER_DETECTION
#elif defined(SMAA_PRESET_MEDIUM)
#define SMAA_THRESHOLD 0.1
#define SMAA_MAX_SEARCH_STEPS 8
#define SMAA_DISABLE_DIAG_DETECTION
#define SMAA_DISABLE_CORNER_DETECTION
#elif defined(SMAA_PRESET_HIGH)
#define SMAA_THRESHOLD 0.1
#define SMAA_MAX_SEARCH_STEPS 16
#define SMAA_MAX_SEARCH_STEPS_DIAG 8
#define SMAA_CORNER_ROUNDING 25
#elif defined(SMAA_PRESET_ULTRA)
#define SMAA_THRESHOLD 0.05
#define SMAA_MAX_SEARCH_STEPS 32
#define SMAA_MAX_SEARCH_STEPS_DIAG 16
#define SMAA_CORNER_ROUNDING 25
#endif
//-----------------------------------------------------------------------------
// Configurable Defines
/**
* SMAA_THRESHOLD specifies the threshold or sensitivity to edges.
* Lowering this value you will be able to detect more edges at the expense of
* performance.
*
* Range: [0, 0.5]
* 0.1 is a reasonable value, and allows to catch most visible edges.
* 0.05 is a rather overkill value, that allows to catch 'em all.
*
* If temporal supersampling is used, 0.2 could be a reasonable value, as low
* contrast edges are properly filtered by just 2x.
*/
#ifndef SMAA_THRESHOLD
#define SMAA_THRESHOLD 0.1
#endif
/**
* SMAA_DEPTH_THRESHOLD specifies the threshold for depth edge detection.
*
* Range: depends on the depth range of the scene.
*/
#ifndef SMAA_DEPTH_THRESHOLD
#define SMAA_DEPTH_THRESHOLD (0.1 * SMAA_THRESHOLD)
#endif
/**
* SMAA_MAX_SEARCH_STEPS specifies the maximum steps performed in the
* horizontal/vertical pattern searches, at each side of the pixel.
*
* In number of pixels, it's actually the double. So the maximum line length
* perfectly handled by, for example 16, is 64 (by perfectly, we meant that
* longer lines won't look as good, but still antialiased).
*
* Range: [0, 112]
*/
#ifndef SMAA_MAX_SEARCH_STEPS
#define SMAA_MAX_SEARCH_STEPS 16
#endif
/**
* SMAA_MAX_SEARCH_STEPS_DIAG specifies the maximum steps performed in the
* diagonal pattern searches, at each side of the pixel. In this case we jump
* one pixel at time, instead of two.
*
* Range: [0, 20]
*
* On high-end machines it is cheap (between a 0.8x and 0.9x slower for 16
* steps), but it can have a significant impact on older machines.
*
* Define SMAA_DISABLE_DIAG_DETECTION to disable diagonal processing.
*/
#ifndef SMAA_MAX_SEARCH_STEPS_DIAG
#define SMAA_MAX_SEARCH_STEPS_DIAG 8
#endif
/**
* SMAA_CORNER_ROUNDING specifies how much sharp corners will be rounded.
*
* Range: [0, 100]
*
* Define SMAA_DISABLE_CORNER_DETECTION to disable corner processing.
*/
#ifndef SMAA_CORNER_ROUNDING
#define SMAA_CORNER_ROUNDING 25
#endif
/**
* If there is an neighbor edge that has SMAA_LOCAL_CONTRAST_FACTOR times
* bigger contrast than current edge, current edge will be discarded.
*
* This allows to eliminate spurious crossing edges, and is based on the fact
* that, if there is too much contrast in a direction, that will hide
* perceptually contrast in the other neighbors.
*/
#ifndef SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR
#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 2.0
#endif
/**
* Predicated thresholding allows to better preserve texture details and to
* improve performance, by decreasing the number of detected edges using an
* additional buffer like the light accumulation buffer, object ids or even the
* depth buffer (the depth buffer usage may be limited to indoor or short range
* scenes).
*
* It locally decreases the luma or color threshold if an edge is found in an
* additional buffer (so the global threshold can be higher).
*
* This method was developed by Playstation EDGE MLAA team, and used in
* Killzone 3, by using the light accumulation buffer. More information here:
* http://iryoku.com/aacourse/downloads/06-MLAA-on-PS3.pptx
*/
#ifndef SMAA_PREDICATION
#define SMAA_PREDICATION 0
#endif
/**
* Threshold to be used in the additional predication buffer.
*
* Range: depends on the input, so you'll have to find the magic number that
* works for you.
*/
#ifndef SMAA_PREDICATION_THRESHOLD
#define SMAA_PREDICATION_THRESHOLD 0.01
#endif
/**
* How much to scale the global threshold used for luma or color edge
* detection when using predication.
*
* Range: [1, 5]
*/
#ifndef SMAA_PREDICATION_SCALE
#define SMAA_PREDICATION_SCALE 2.0
#endif
/**
* How much to locally decrease the threshold.
*
* Range: [0, 1]
*/
#ifndef SMAA_PREDICATION_STRENGTH
#define SMAA_PREDICATION_STRENGTH 0.4
#endif
/**
* Temporal reprojection allows to remove ghosting artifacts when using
* temporal supersampling. We use the CryEngine 3 method which also introduces
* velocity weighting. This feature is of extreme importance for totally
* removing ghosting. More information here:
* http://iryoku.com/aacourse/downloads/13-Anti-Aliasing-Methods-in-CryENGINE-3.pdf
*
* Note that you'll need to setup a velocity buffer for enabling reprojection.
* For static geometry, saving the previous depth buffer is a viable
* alternative.
*/
#ifndef SMAA_REPROJECTION
#define SMAA_REPROJECTION 0
#endif
/**
* SMAA_REPROJECTION_WEIGHT_SCALE controls the velocity weighting. It allows to
* remove ghosting trails behind the moving object, which are not removed by
* just using reprojection. Using low values will exhibit ghosting, while using
* high values will disable temporal supersampling under motion.
*
* Behind the scenes, velocity weighting removes temporal supersampling when
* the velocity of the subsamples differs (meaning they are different objects).
*
* Range: [0, 80]
*/
#ifndef SMAA_REPROJECTION_WEIGHT_SCALE
#define SMAA_REPROJECTION_WEIGHT_SCALE 30.0
#endif
/**
* On some compilers, discard cannot be used in vertex shaders. Thus, they need
* to be compiled separately.
*/
#ifndef SMAA_INCLUDE_VS
#define SMAA_INCLUDE_VS 1
#endif
#ifndef SMAA_INCLUDE_PS
#define SMAA_INCLUDE_PS 1
#endif
//-----------------------------------------------------------------------------
// Texture Access Defines
#ifndef SMAA_AREATEX_SELECT
#if defined(SMAA_HLSL_3)
#define SMAA_AREATEX_SELECT(sample) sample.ra
#else
#define SMAA_AREATEX_SELECT(sample) sample.rg
#endif
#endif
#ifndef SMAA_SEARCHTEX_SELECT
#define SMAA_SEARCHTEX_SELECT(sample) sample.r
#endif
#ifndef SMAA_DECODE_VELOCITY
#define SMAA_DECODE_VELOCITY(sample) sample.rg
#endif
//-----------------------------------------------------------------------------
// Non-Configurable Defines
#define SMAA_AREATEX_MAX_DISTANCE 16
#define SMAA_AREATEX_MAX_DISTANCE_DIAG 20
#define SMAA_AREATEX_PIXEL_SIZE (1.0 / vec2(160.0, 560.0))
#define SMAA_AREATEX_SUBTEX_SIZE (1.0 / 7.0)
#define SMAA_SEARCHTEX_SIZE vec2(66.0, 33.0)
#define SMAA_SEARCHTEX_PACKED_SIZE vec2(64.0, 16.0)
#define SMAA_CORNER_ROUNDING_NORM (float(SMAA_CORNER_ROUNDING) / 100.0)
//-----------------------------------------------------------------------------
// Porting Functions
#if defined(SMAA_HLSL_3)
#define SMAATexture2D(tex) sampler2D tex
#define SMAATexturePass2D(tex) tex
#define SMAASampleLevelZero(tex, coord) tex2Dlod(tex, float4(coord, 0.0, 0.0))
#define SMAASampleLevelZeroPoint(tex, coord) tex2Dlod(tex, float4(coord, 0.0, 0.0))
#define SMAASampleLevelZeroOffset(tex, coord, offset) tex2Dlod(tex, float4(coord + offset * SMAA_RT_METRICS.xy, 0.0, 0.0))
#define SMAASample(tex, coord) tex2D(tex, coord)
#define SMAASamplePoint(tex, coord) tex2D(tex, coord)
#define SMAASampleOffset(tex, coord, offset) tex2D(tex, coord + offset * SMAA_RT_METRICS.xy)
#define SMAA_FLATTEN [flatten]
#define SMAA_BRANCH [branch]
#endif
#if defined(SMAA_HLSL_4) || defined(SMAA_HLSL_4_1)
SamplerState LinearSampler { Filter = MIN_MAG_LINEAR_MIP_POINT; AddressU = Clamp; AddressV = Clamp; };
SamplerState PointSampler { Filter = MIN_MAG_MIP_POINT; AddressU = Clamp; AddressV = Clamp; };
#define SMAATexture2D(tex) Texture2D tex
#define SMAATexturePass2D(tex) tex
#define SMAASampleLevelZero(tex, coord) tex.SampleLevel(LinearSampler, coord, 0)
#define SMAASampleLevelZeroPoint(tex, coord) tex.SampleLevel(PointSampler, coord, 0)
#define SMAASampleLevelZeroOffset(tex, coord, offset) tex.SampleLevel(LinearSampler, coord, 0, offset)
#define SMAASample(tex, coord) tex.Sample(LinearSampler, coord)
#define SMAASamplePoint(tex, coord) tex.Sample(PointSampler, coord)
#define SMAASampleOffset(tex, coord, offset) tex.Sample(LinearSampler, coord, offset)
#define SMAA_FLATTEN [flatten]
#define SMAA_BRANCH [branch]
#define SMAATexture2DMS2(tex) Texture2DMS<float4, 2> tex
#define SMAALoad(tex, pos, sample) tex.Load(pos, sample)
#if defined(SMAA_HLSL_4_1)
#define SMAAGather(tex, coord) tex.Gather(LinearSampler, coord, 0)
#endif
#endif
#if defined(SMAA_GLSL_3) || defined(SMAA_GLSL_4)
#define SMAATexture2D(tex) sampler2D tex
#define SMAATexturePass2D(tex) tex
#define SMAASampleLevelZero(tex, coord) textureLod(tex, coord, 0.0)
#define SMAASampleLevelZeroPoint(tex, coord) textureLod(tex, coord, 0.0)
#define SMAASampleLevelZeroOffset(tex, coord, offset) textureLodOffset(tex, coord, 0.0, offset)
#define SMAASample(tex, coord) texture(tex, coord)
#define SMAASamplePoint(tex, coord) texture(tex, coord)
#define SMAASampleOffset(tex, coord, offset) texture(tex, coord, offset)
#define SMAA_FLATTEN
#define SMAA_BRANCH
#define lerp(a, b, t) mix(a, b, t)
#define saturate(a) clamp(a, 0.0, 1.0)
#if defined(SMAA_GLSL_4)
#define mad(a, b, c) fma(a, b, c)
#define SMAAGather(tex, coord) textureGather(tex, coord)
#define SMAAGather(tex, coord) textureGather(tex, coord)
#else
#define mad(a, b, c) (a * b + c)
#endif
#define float2 vec2
#define float3 vec3
#define float4 vec4
#define int2 ivec2
#define int3 ivec3
#define int4 ivec4
#define bool2 bvec2
#define bool3 bvec3
#define bool4 bvec4
#endif
#if !defined(SMAA_HLSL_3) && !defined(SMAA_HLSL_4) && !defined(SMAA_HLSL_4_1) && !defined(SMAA_GLSL_3) && !defined(SMAA_GLSL_4) && !defined(SMAA_CUSTOM_SL)
#error you must define the shading language: SMAA_HLSL_*, SMAA_GLSL_* or SMAA_CUSTOM_SL
#endif
/**
* Gathers current pixel, and the top-left neighbors.
*/
vec3 SMAAGatherNeighbours(vec2 coord, vec4 offset[3], sampler2D tex)
{
float P = texture(tex, coord).r;
float Pleft = texture(tex, offset[0].xy).r;
float Ptop = texture(tex, offset[0].zw).r;
return vec3(P, Pleft, Ptop);
}
/**
* Adjusts the threshold by means of predication.
*/
vec3 SMAACalculatePredicatedThreshold(vec2 coord, vec4 offset[3], sampler2D predicationTex)
{
vec3 neighbours = SMAAGatherNeighbours(coord, offset, predicationTex);
vec2 delta = abs(neighbours.xx - neighbours.yz);
vec2 edges = step(SMAA_PREDICATION_THRESHOLD, delta);
return SMAA_PREDICATION_SCALE * SMAA_THRESHOLD * (1.0 - SMAA_PREDICATION_STRENGTH * edges);
}
/**
* Conditional move:
*/
void SMAAMovc(bvec2 cond, inout vec2 variable, vec2 value) {
if (cond.x) variable.x = value.x;
if (cond.y) variable.y = value.y;
}
void SMAAMovc(bvec4 cond, inout vec4 variable, vec4 value) {
SMAAMovc(cond.xy, variable.xy, value.xy);
SMAAMovc(cond.zw, variable.zw, value.zw);
}
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