@banuba/webar
Version:
Banuba WebAR SDK
503 lines (449 loc) • 351 kB
JavaScript
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attribute vec2 a_position;
varying vec2 v_tex_uv;
void main() {
v_tex_uv.x = (a_position.x + 1.) * .5;
v_tex_uv.y = 1. - (a_position.y + 1.) * .5;
gl_Position = vec4(a_position, 0., 1.);
}
`,Mu=`precision highp float;
#define GLSLIFY 1
varying vec2 v_tex_uv;
uniform sampler2D u_texture;
uniform vec2 u_viewsize;
/**
* u_filters.x - denoising algorithm to use
* 1 - FSR
* 2 - Bilateral
* any other value - none
* u_filters.y - light correction coefficient in [0, 2]
* 1 - no light correction
*/
uniform vec2 u_filters;
// https://github.com/glslify/glslify#importing-a-glsl-module
// https://github.com/glslify/glslify#passing-references-between-modules
// Copyright (c) 2021 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of 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.
//
// 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.
//
// FidelityFX FSR v1.0.2 by AMD
// ported to mpv by agyild - https://gist.github.com/agyild/82219c545228d70c5604f865ce0b0ce5
// ported to WebGL by goingdigital - https://www.shadertoy.com/view/stXSWB
// using colorspace functions from tobspr - https://github.com/tobspr/GLSL-Color-Spaces/blob/master/ColorSpaces.inc.glsl
#define SHARPENING 2.0 // Sharpening intensity: Adjusts sharpening intensity by averaging the original pixels to the sharpened result. 1.0 is the unmodified default. 0.0 to 1.0.
#define CONTRAST 2.0 // Adjusts the range the shader adapts to high contrast (0 is not all the way off). Higher values = more high contrast sharpening. 0.0 to 1.0.
#define PERFORMANCE 1 // Whether to use optimizations for performance with loss of quality
// Used to convert from linear RGB to XYZ space
const mat3 RGB_2_XYZ_2717090884 = (mat3(
0.4124564, 0.2126729, 0.0193339,
0.3575761, 0.7151522, 0.1191920,
0.1804375, 0.0721750, 0.9503041
));
// Used to convert from XYZ to linear RGB space
const mat3 XYZ_2_RGB_2717090884 = (mat3(
3.2404542,-0.9692660, 0.0556434,
-1.5371385, 1.8760108,-0.2040259,
-0.4985314, 0.0415560, 1.0572252
));
// Converts a color from linear RGB to XYZ space
vec3 rgb_to_xyz_2717090884(vec3 rgb) {
return RGB_2_XYZ_2717090884 * rgb;
}
// Converts a color from XYZ to linear RGB space
vec3 xyz_to_rgb_2717090884(vec3 xyz) {
return XYZ_2_RGB_2717090884 * xyz;
}
/* EASU stage
*
* This takes a reduced resolution source, and scales it up while preserving detail.
*
* Updates:
* stretch definition fixed. Thanks nehon for the bug report!
*/
vec3 FsrEasuCF(vec2 p) {
vec2 uv = (p + .5) / u_viewsize;
vec4 color = texture2D(u_texture, uv);
return rgb_to_xyz_2717090884(color.rgb);
}
/**** EASU ****/
void FsrEasuCon(
out vec4 con0,
out vec4 con1,
out vec4 con2,
out vec4 con3,
// This the rendered image resolution being upscaled
vec2 inputViewportInPixels,
// This is the resolution of the resource containing the input image (useful for dynamic resolution)
vec2 inputSizeInPixels,
// This is the display resolution which the input image gets upscaled to
vec2 outputSizeInPixels
)
{
// Output integer position to a pixel position in viewport.
con0 = vec4(
inputViewportInPixels.x/outputSizeInPixels.x,
inputViewportInPixels.y/outputSizeInPixels.y,
.5*inputViewportInPixels.x/outputSizeInPixels.x-.5,
.5*inputViewportInPixels.y/outputSizeInPixels.y-.5
);
// Viewport pixel position to normalized image space.
// This is used to get upper-left of 'F' tap.
con1 = vec4(1.,1.,1.,-1.)/inputSizeInPixels.xyxy;
// Centers of gather4, first offset from upper-left of 'F'.
// +---+---+
// | | |
// +--(0)--+
// | b | c |
// +---F---+---+---+
// | e | f | g | h |
// +--(1)--+--(2)--+
// | i | j | k | l |
// +---+---+---+---+
// | n | o |
// +--(3)--+
// | | |
// +---+---+
// These are from (0) instead of 'F'.
con2 = vec4(-1.,2.,1.,2.)/inputSizeInPixels.xyxy;
con3 = vec4(0.,4.,0.,0.)/inputSizeInPixels.xyxy;
}
// Filtering for a given tap for the scalar.
void FsrEasuTapF(
inout vec3 aC, // Accumulated color, with negative lobe.
inout float aW, // Accumulated weight.
vec2 off_0, // Pixel offset from resolve position to tap.
vec2 dir_0, // Gradient direction.
vec2 len_0, // Length.
float lob_0, // Negative lobe strength.
float clp_0, // Clipping point.
vec3 c_0
)
{
// Tap color.
// Rotate offset by direction.
vec2 v = vec2(dot(off_0, dir_0), dot(off_0,vec2(-dir_0.y,dir_0.x)));
// Anisotropy.
v *= len_0;
// Compute distance^2.
float d2 = min(dot(v,v),clp_0);
// Limit to the window as at corner, 2 taps can easily be outside.
// Approximation of lancos2 without sin() or rcp(), or sqrt() to get x.
// (25/16 * (2/5 * x^2 - 1)^2 - (25/16 - 1)) * (1/4 * x^2 - 1)^2
// |_______________________________________| |_______________|
// base window
// The general form of the 'base' is,
// (a*(b*x^2-1)^2-(a-1))
// Where 'a=1/(2*b-b^2)' and 'b' moves around the negative lobe.
float wB = .4 * d2 - 1.;
float wA = lob_0 * d2 -1.;
wB *= wB;
wA *= wA;
wB = 1.5625*wB-.5625;
float w= wB * wA;
// Do weighted average.
aC += c_0*w;
aW += w;
}
//------------------------------------------------------------------------------------------------------------------------------
// Accumulate direction and length.
void FsrEasuSetF(
inout vec2 dir,
inout float len,
float w,
float lA,float lB,float lC,float lD,float lE
)
{
// Direction is the '+' diff.
// a
// b c d
// e
// Then takes magnitude from abs average of both sides of 'c'.
// Length converts gradient reversal to 0, smoothly to non-reversal at 1, shaped, then adding horz and vert terms.
float lenX = max(abs(lD - lC), abs(lC - lB));
float dirX = lD - lB;
dir.x += dirX * w;
lenX = clamp(abs(dirX)/lenX,0.,1.);
lenX *= lenX;
len += lenX * w;
// Repeat for the y axis.
float lenY = max(abs(lE - lC), abs(lC - lA));
float dirY = lE - lA;
dir.y += dirY * w;
lenY = clamp(abs(dirY) / lenY,0.,1.);
lenY *= lenY;
len += lenY * w;
}
//------------------------------------------------------------------------------------------------------------------------------
void FsrEasuF(
out vec3 pix,
vec2 ip, // Integer pixel position in output.
// Constants generated by FsrEasuCon().
vec4 con0, // xy = output to input scale, zw = first pixel offset correction
vec4 con1_0,
vec4 con2_0,
vec4 con3_0
)
{
//------------------------------------------------------------------------------------------------------------------------------
// Get position of 'f'.
vec2 pp = ip * con0.xy + con0.zw; // Corresponding input pixel/subpixel
vec2 fp = floor(pp);// fp = source nearest pixel
pp -= fp; // pp = source subpixel
//------------------------------------------------------------------------------------------------------------------------------
// 12-tap kernel.
// b c
// e f g h
// i j k l
// n o
// Gather 4 ordering.
// a b
// r g
vec2 p0 = fp * con1_0.xy + con1_0.zw;
// These are from p0 to avoid pulling two constants on pre-Navi hardware.
vec2 p1 = p0 + con2_0.xy;
vec2 p2 = p0 + con2_0.zw;
vec2 p3 = p0 + con3_0.xy;
// TextureGather is not available on WebGL2
vec4 off = vec4(-.5,.5,-.5,.5)*con1_0.xxyy;
// textureGather to texture offsets
// x=west y=east z=north w=south
vec3 bC = FsrEasuCF(p0 + off.xw); float bL = bC.g + 0.5 *(bC.r + bC.b);
vec3 cC = FsrEasuCF(p0 + off.yw); float cL = cC.g + 0.5 *(cC.r + cC.b);
vec3 iC = FsrEasuCF(p1 + off.xw); float iL = iC.g + 0.5 *(iC.r + iC.b);
vec3 jC = FsrEasuCF(p1 + off.yw); float jL = jC.g + 0.5 *(jC.r + jC.b);
vec3 fC = FsrEasuCF(p1 + off.yz); float fL = fC.g + 0.5 *(fC.r + fC.b);
vec3 eC = FsrEasuCF(p1 + off.xz); float eL = eC.g + 0.5 *(eC.r + eC.b);
vec3 kC = FsrEasuCF(p2 + off.xw); float kL = kC.g + 0.5 *(kC.r + kC.b);
vec3 lC = FsrEasuCF(p2 + off.yw); float lL = lC.g + 0.5 *(lC.r + lC.b);
vec3 hC = FsrEasuCF(p2 + off.yz); float hL = hC.g + 0.5 *(hC.r + hC.b);
vec3 gC = FsrEasuCF(p2 + off.xz); float gL = gC.g + 0.5 *(gC.r + gC.b);
vec3 oC = FsrEasuCF(p3 + off.yz); float oL = oC.g + 0.5 *(oC.r + oC.b);
vec3 nC = FsrEasuCF(p3 + off.xz); float nL = nC.g + 0.5 *(nC.r + nC.b);
//------------------------------------------------------------------------------------------------------------------------------
// Simplest multi-channel approximate luma possible (luma times 2, in 2 FMA/MAD).
// Accumulate for bilinear interpolation.
vec2 dir = vec2(0.);
float len = 0.;
FsrEasuSetF(dir, len, (1.-pp.x)*(1.-pp.y), bL, eL, fL, gL, jL);
FsrEasuSetF(dir, len, pp.x *(1.-pp.y), cL, fL, gL, hL, kL);
FsrEasuSetF(dir, len, (1.-pp.x)* pp.y , fL, iL, jL, kL, nL);
FsrEasuSetF(dir, len, pp.x * pp.y , gL, jL, kL, lL, oL);
//------------------------------------------------------------------------------------------------------------------------------
// Normalize with approximation, and cleanup close to zero.
vec2 dir2 = dir * dir;
float dirR = dir2.x + dir2.y;
bool zro = dirR < (1.0/32768.0);
dirR = inversesqrt(dirR);
#if (PERFORMANCE == 1)
if (zro) {
vec4 w = vec4(0.0);
w.x = (1.0 - pp.x) * (1.0 - pp.y);
w.y = pp.x * (1.0 - pp.y);
w.z = (1.0 - pp.x) * pp.y;
w.w = pp.x * pp.y;
pix.r = clamp(dot(w, vec4(fL, gL, jL, kL)), 0.0, 1.0);
return;
}
#elif (PERFORMANCE == 0)
dirR = zro ? 1.0 : dirR;
dir.x = zro ? 1.0 : dir.x;
#endif
dir *= vec2(dirR);
// Transform from {0 to 2} to {0 to 1} range, and shape with square.
len = len * 0.5;
len *= len;
// Stretch kernel {1.0 vert|horz, to sqrt(2.0) on diagonal}.
float stretch = dot(dir,dir) / (max(abs(dir.x), abs(dir.y)));
// Anisotropic length after rotation,
// x := 1.0 lerp to 'stretch' on edges
// y := 1.0 lerp to 2x on edges
vec2 len2 = vec2(1. +(stretch-1.0)*len, 1. -.5 * len);
// Based on the amount of 'edge',
// the window shifts from +/-{sqrt(2.0) to slightly beyond 2.0}.
float lob = .5 - .29 * len;
// Set distance^2 clipping point to the end of the adjustable window.
float clp = 1./lob;
//------------------------------------------------------------------------------------------------------------------------------
// Accumulation mixed with min/max of 4 nearest.
// b c
// e f g h
// i j k l
// n o
// Accumulation.
vec3 aC = vec3(0);
float aW = 0.;
FsrEasuTapF(aC, aW, vec2( 0.,-1.)-pp, dir, len2, lob, clp, bC);
FsrEasuTapF(aC, aW, vec2( 1.,-1.)-pp, dir, len2, lob, clp, cC);
FsrEasuTapF(aC, aW, vec2(-1., 1.)-pp, dir, len2, lob, clp, iC);
FsrEasuTapF(aC, aW, vec2( 0., 1.)-pp, dir, len2, lob, clp, jC);
FsrEasuTapF(aC, aW, vec2( 0., 0.)-pp, dir, len2, lob, clp, fC);
FsrEasuTapF(aC, aW, vec2(-1., 0.)-pp, dir, len2, lob, clp, eC);
FsrEasuTapF(aC, aW, vec2( 1., 1.)-pp, dir, len2, lob, clp, kC);
FsrEasuTapF(aC, aW, vec2( 2., 1.)-pp, dir, len2, lob, clp, lC);
FsrEasuTapF(aC, aW, vec2( 2., 0.)-pp, dir, len2, lob, clp, hC);
FsrEasuTapF(aC, aW, vec2( 1., 0.)-pp, dir, len2, lob, clp, gC);
FsrEasuTapF(aC, aW, vec2( 1., 2.)-pp, dir, len2, lob, clp, oC);
FsrEasuTapF(aC, aW, vec2( 0., 2.)-pp, dir, len2, lob, clp, nC);
//------------------------------------------------------------------------------------------------------------------------------
// Normalize and dering.
#if (PERFORMANCE == 1)
pix = aC/aW;
#elif (PERFORMANCE == 0)
vec3 min4 = min(min(fC,gC),min(jC,kC));
vec3 max4 = max(max(fC,gC),max(jC,kC));
pix=min(max4,max(min4,aC/aW));
#endif
}
void EASU( out vec4 fragColor, in vec2 fragCoord )
{
vec3 c;
vec4 con0,con1,con2,con3;
// "rendersize" refers to size of source image before upscaling.
vec2 rendersize = u_viewsize;
FsrEasuCon(
con0, con1, con2, con3, rendersize, rendersize, rendersize
);
FsrEasuF(c, fragCoord, con0, con1, con2, con3);
fragColor = vec4(xyz_to_rgb_2717090884(c.xyz), 1);
}
vec4 getPixel(vec2 pos) {
vec2 coord = (pos + .5) / u_viewsize;
coord.y = 1.0 - coord.y;
return texture2D(u_texture, coord);
}
vec4 fsr_easu_2717090884(vec2 uv) {
vec4 e = getPixel(gl_FragCoord.xy);
vec4 e_xyz = vec4(rgb_to_xyz_2717090884(e.rgb), 1);
EASU(e_xyz, (gl_FragCoord.xy + 0.5) / u_viewsize);
// fetch a 3x3 neighborhood around the pixel 'e',
// a b c
// d(e)f
// g h i
vec3 a = getPixel(gl_FragCoord.xy + vec2(-1.0,-1.0)).rgb;
vec3 b = getPixel(gl_FragCoord.xy + vec2( 0.0,-1.0)).rgb;
vec3 c = getPixel(gl_FragCoord.xy + vec2( 1.0,-1.0)).rgb;
vec3 f = getPixel(gl_FragCoord.xy + vec2( 1.0, 0.0)).rgb;
vec3 g = getPixel(gl_FragCoord.xy + vec2(-1.0, 1.0)).rgb;
vec3 h = getPixel(gl_FragCoord.xy + vec2( 0.0, 1.0)).rgb;
vec3 d = getPixel(gl_FragCoord.xy + vec2(-1.0, 0.0)).rgb;
vec3 i = getPixel(gl_FragCoord.xy + vec2( 1.0, 1.0)).rgb;;
// Soft min and max.
// a b c b
// d e f * 0.5 + d e f * 0.5
// g h i h
// These are 2.0x bigger (factored out the extra multiply).
vec3 mnRGB = min(min(min(d, e.rgb), min(f, b)), h);
vec3 mnRGB2 = min(mnRGB, min(min(a, c), min(g, i)));
mnRGB += mnRGB2;
vec3 mxRGB = max(max(max(d, e.rgb), max(f, b)), h);
vec3 mxRGB2 = max(mxRGB, max(max(a, c), max(g, i)));
mxRGB += mxRGB2;
// Smooth minimum distance to signal limit divided by smooth max.
vec3 rcpMRGB = 1.0 / mxRGB;
vec3 ampRGB = clamp(min(mnRGB, 2.0 - mxRGB) * rcpMRGB, 0.0, 1.0);
// Shaping amount of sharpening.
ampRGB = inversesqrt(ampRGB);
float peak = -3.0 * clamp(CONTRAST, 0.0, 1.0) + 8.0;
vec3 wRGB = -(1.0 / (ampRGB * peak));
vec3 rcpWeightRGB = 1.0 / (4.0 * wRGB + 1.0);
// 0 w 0
// Filter shape: w 1 w
// 0 w 0
vec3 window = (b + d) + (f + h);
vec3 outColor = clamp((window * wRGB + e.rgb) * rcpWeightRGB, 0.0, 1.0);
return vec4(mix(e.rgb, outColor, SHARPENING), e.a);
}
// https://github.com/glslify/glslify#exporting-a-glsl-module
#define DIFF 1.0
#define RADIUS 4.0
void bilateral_iter_3977570374(vec2 random_dir, vec2 radius, float diff, vec4 pixel, vec2 uv, inout vec3 result, inout float totalWeight)
{
vec2 dir = random_dir * radius;
vec3 randomPixel = texture2D(u_texture, uv + dir).xyz;
vec3 delta = randomPixel - pixel.rgb;
float weight = exp(-dot(delta, delta) / diff);
result += randomPixel * weight;
totalWeight += weight;
}
vec4 bilateral(vec2 uv)
{
vec2 radius = (RADIUS / u_viewsize);
float diff = DIFF / 255.0;
vec4 pixel = texture2D(u_texture, uv);
vec3 result = vec3(0.0, 0.0, 0.0);
float totalWeight = 0.0;
// uroll loop and substitute precalculated random vectors for GLSL 1.0 ES:
bilateral_iter_3977570374(vec2(-0.886051297,0.447155535), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(0.270759493,0.537728608), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.896959424,0.440607518), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.804274619,0.125076547), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(0.373693645,0.240383312), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.850325704,-0.192106694), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.453608066,0.889671504), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.280496657,0.206442386), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(0.840040743,-0.36367026), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.151598319,-0.884027064), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.221440807,0.593896627), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.797481239,-0.243254974), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(0.48824361,0.225083455), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.0387817062,0.838459492), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(0.92897892,-0.133588716), radius, diff, pixel, uv, result, totalWeight);
bilateral_iter_3977570374(vec2(-0.693672359,-0.706737161), radius, diff, pixel, uv, result, totalWeight);
result = result / totalWeight;
return vec4(result, pixel.a);
}
// https://github.com/glslify/glslify#exporting-a-glsl-module
vec3 rgb2hsv(vec3 c)
{
vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
float d = q.x - min(q.w, q.y);
float e = 1.0e-10;
return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}
vec3 hsv2rgb(vec3 c)
{
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
vec4 light_correction_1117569599(vec4 c, float s)
{
vec3 hsv = rgb2hsv(c.rgb);
hsv.y = pow(hsv.y, pow(s, -0.5));
hsv.z = pow(hsv.z, s);
vec3 rgb = hsv2rgb(hsv);
return vec4(rgb, c.a);
}
// https://github.com/glslify/glslify#exporting-a-glsl-module
void main() {
vec4 c;
if (u_filters.x == 1.)
c = fsr_easu_2717090884(v_tex_uv);
else if (u_filters.x == 2.)
c = bilateral(v_tex_uv);
else
c = texture2D(u_texture, v_tex_uv);
if (u_filters.y != 1.)
c = light_correction_1117569599(c, u_filters.y);
gl_FragColor = c;
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