mirror of
https://github.com/libretro/slang-shaders.git
synced 2024-06-02 03:18:53 -04:00
201 lines
6.4 KiB
Plaintext
201 lines
6.4 KiB
Plaintext
#version 450
|
|
|
|
/*
|
|
Hyllian's jinc windowed-jinc 2-lobe with anti-ringing Shader
|
|
|
|
Copyright (C) 2011-2016 Hyllian - sergiogdb@gmail.com
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
/*
|
|
This is an approximation of Jinc(x)*Jinc(x*r1/r2) for x < 2.5,
|
|
where r1 and r2 are the first two zeros of jinc function.
|
|
For a jinc 2-lobe best approximation, use A=0.5 and B=0.825.
|
|
*/
|
|
|
|
// A=0.5, B=0.825 is the best jinc approximation for x<2.5. if B=1.0, it's a lanczos filter.
|
|
// Increase A to get more blur. Decrease it to get a sharper picture.
|
|
// B = 0.825 to get rid of dithering. Increase B to get a fine sharpness, though dithering returns.
|
|
|
|
layout(push_constant) uniform Push
|
|
{
|
|
vec4 SourceSize;
|
|
vec4 OriginalSize;
|
|
vec4 OutputSize;
|
|
uint FrameCount;
|
|
float JINC2_WINDOW_SINC;
|
|
float JINC2_SINC;
|
|
float JINC2_AR_STRENGTH;
|
|
} params;
|
|
|
|
#pragma parameter JINC2_WINDOW_SINC "Window Sinc Param" 0.42 0.0 1.0 0.01
|
|
#pragma parameter JINC2_SINC "Sinc Param" 0.92 0.0 1.0 0.01
|
|
#pragma parameter JINC2_AR_STRENGTH "Anti-ringing Strength" 0.8 0.0 1.0 0.1
|
|
|
|
#define JINC2_WINDOW_SINC params.JINC2_WINDOW_SINC
|
|
#define JINC2_SINC params.JINC2_SINC
|
|
#define JINC2_AR_STRENGTH params.JINC2_AR_STRENGTH
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
} global;
|
|
|
|
#define saturate(c) clamp(c, 0.0, 1.0)
|
|
#define lerp(a,b,c) mix(a,b,c)
|
|
#define mul(a,b) (b*a)
|
|
#define fmod(c) mod(c)
|
|
#define frac(c) fract(c)
|
|
#define tex2D(c,d) texture(c,d)
|
|
#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
|
|
#define float2x2 mat2x2
|
|
#define float3x3 mat3x3
|
|
#define float4x4 mat4x4
|
|
#define float4x3 mat4x3
|
|
|
|
#define halfpi 1.5707963267948966192313216916398
|
|
#define pi 3.1415926535897932384626433832795
|
|
#define wa (JINC2_WINDOW_SINC*pi)
|
|
#define wb (JINC2_SINC*pi)
|
|
|
|
const float3 Y = float3(0.299, 0.587, 0.114);
|
|
|
|
float df(float A, float B)
|
|
{
|
|
return abs(A-B);
|
|
}
|
|
|
|
// Calculates the distance between two points
|
|
float d(float2 pt1, float2 pt2)
|
|
{
|
|
float2 v = pt2 - pt1;
|
|
return sqrt(dot(v,v));
|
|
}
|
|
|
|
float3 min4(float3 a, float3 b, float3 c, float3 d)
|
|
{
|
|
return min(a, min(b, min(c, d)));
|
|
}
|
|
|
|
float3 max4(float3 a, float3 b, float3 c, float3 d)
|
|
{
|
|
return max(a, max(b, max(c, d)));
|
|
}
|
|
|
|
float4 resampler(float4 x)
|
|
{
|
|
float4 res;
|
|
|
|
res = (x==float4(0.0, 0.0, 0.0, 0.0)) ? float4(wa*wb) : sin(x*wa)*sin(x*wb)/(x*x);
|
|
|
|
return res;
|
|
}
|
|
|
|
#pragma stage vertex
|
|
layout(location = 0) in vec4 Position;
|
|
layout(location = 1) in vec2 TexCoord;
|
|
layout(location = 0) out vec2 vTexCoord;
|
|
|
|
void main()
|
|
{
|
|
gl_Position = global.MVP * Position;
|
|
vTexCoord = TexCoord * 1.00001;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 vTexCoord;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D Source;
|
|
|
|
void main()
|
|
{
|
|
float3 color;
|
|
float4x4 weights;
|
|
|
|
float2 dx = float2(1.0, 0.0);
|
|
float2 dy = float2(0.0, 1.0);
|
|
|
|
float2 pc = vTexCoord*params.SourceSize.xy;
|
|
|
|
float2 tc = (floor(pc-float2(0.4999,0.4999))+float2(0.4999,0.4999));
|
|
|
|
weights[0] = resampler(float4(d(pc, tc -dx -dy), d(pc, tc -dy), d(pc, tc +dx -dy), d(pc, tc+2.0*dx -dy)));
|
|
weights[1] = resampler(float4(d(pc, tc -dx ), d(pc, tc ), d(pc, tc +dx ), d(pc, tc+2.0*dx )));
|
|
weights[2] = resampler(float4(d(pc, tc -dx +dy), d(pc, tc +dy), d(pc, tc +dx +dy), d(pc, tc+2.0*dx +dy)));
|
|
weights[3] = resampler(float4(d(pc, tc -dx+2.0*dy), d(pc, tc +2.0*dy), d(pc, tc +dx+2.0*dy), d(pc, tc+2.0*dx+2.0*dy)));
|
|
|
|
//weights[0][0] = weights[0][3] = weights[3][0] = weights[3][3] = 0.0;
|
|
|
|
dx = dx * params.SourceSize.zw;
|
|
dy = dy * params.SourceSize.zw;
|
|
tc = tc * params.SourceSize.zw;
|
|
|
|
// reading the texels
|
|
|
|
float3 c00 = tex2D(Source, tc -dx -dy).xyz;
|
|
float3 c10 = tex2D(Source, tc -dy).xyz;
|
|
float3 c20 = tex2D(Source, tc +dx -dy).xyz;
|
|
float3 c30 = tex2D(Source, tc+2.0*dx -dy).xyz;
|
|
float3 c01 = tex2D(Source, tc -dx ).xyz;
|
|
float3 c11 = tex2D(Source, tc ).xyz;
|
|
float3 c21 = tex2D(Source, tc +dx ).xyz;
|
|
float3 c31 = tex2D(Source, tc+2.0*dx ).xyz;
|
|
float3 c02 = tex2D(Source, tc -dx +dy).xyz;
|
|
float3 c12 = tex2D(Source, tc +dy).xyz;
|
|
float3 c22 = tex2D(Source, tc +dx +dy).xyz;
|
|
float3 c32 = tex2D(Source, tc+2.0*dx +dy).xyz;
|
|
float3 c03 = tex2D(Source, tc -dx+2.0*dy).xyz;
|
|
float3 c13 = tex2D(Source, tc +2.0*dy).xyz;
|
|
float3 c23 = tex2D(Source, tc +dx+2.0*dy).xyz;
|
|
float3 c33 = tex2D(Source, tc+2.0*dx+2.0*dy).xyz;
|
|
|
|
|
|
|
|
color = mul(weights[0], float4x3(c00, c10, c20, c30));
|
|
color+= mul(weights[1], float4x3(c01, c11, c21, c31));
|
|
color+= mul(weights[2], float4x3(c02, c12, c22, c32));
|
|
color+= mul(weights[3], float4x3(c03, c13, c23, c33));
|
|
color = color/(dot(mul(weights, float4(1.0)), float4(1.0)));
|
|
|
|
|
|
|
|
// Anti-ringing
|
|
// Get min/max samples
|
|
|
|
float3 min_sample = min4(c11, c21, c12, c22);
|
|
float3 max_sample = max4(c11, c21, c12, c22);
|
|
|
|
float3 aux = color;
|
|
color = clamp(color, min_sample, max_sample);
|
|
|
|
color = mix(aux, color, JINC2_AR_STRENGTH);
|
|
|
|
// final sum and weight normalization
|
|
FragColor = vec4(color, 1.0);
|
|
} |