mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-10-18 15:51:30 +11:00
216 lines
7.4 KiB
Plaintext
216 lines
7.4 KiB
Plaintext
#version 450
|
|
|
|
/*
|
|
Magic Bloom by luluco250
|
|
Attempts to simulate a natural-looking bloom.
|
|
Features:
|
|
--Wide bloom blurring, derived from the gaussian function
|
|
defined here: https://en.wikipedia.org/wiki/Gaussian_blur#Mathematics
|
|
--Eye adaptation, decreases or increases the brightness
|
|
of bloom according to the overall image luminance.
|
|
--Lens dirt, as standard I suppose. Really not much here.
|
|
It uses an image named "MagicBloom_Dirt.png" so make
|
|
sure you have one in your textures directory.
|
|
--Unwanted features can be disabled through
|
|
preprocessor definitions, saving performance.
|
|
|
|
Preprocessor definitions:
|
|
--MAGICBLOOM_ADAPT_RESOLUTION:
|
|
Determines the width/height of the texture used for adaptation.
|
|
It is recommended to use 256, but you can use as far as 1024 without issues.
|
|
Too low resolutions will make adaptation seem "unstable".
|
|
Must be a power of two value: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 etc.
|
|
--MAGICBLOOM_BLUR_PRECALCULATED:
|
|
If set to 0 the gaussian blur will be calculated inside the shader.
|
|
Otherwise, it uses a pre-calculated kernel (array).
|
|
|
|
--MAGICBLOOM_NODIRT:
|
|
If set to 1 all lens dirt related features are disabled.
|
|
Beneficial for performance if you don't wish to use lens dirt.
|
|
--MAGICBLOOM_NOADAPT:
|
|
If set to 1 all adaptation related features are disabled.
|
|
Beneficial for performance if you don't wish to use adaptation.
|
|
MIT Licensed:
|
|
Copyright (c) 2017 luluco250
|
|
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.
|
|
*/
|
|
|
|
//Statics
|
|
|
|
#ifndef MAGICBLOOM_ADAPT_RESOLUTION
|
|
#define MAGICBLOOM_ADAPT_RESOLUTION 256
|
|
#endif
|
|
|
|
#ifndef MAGICBLOOM_BLUR_PRECALCULATED
|
|
#define MAGICBLOOM_BLUR_PRECALCULATED 1
|
|
#endif
|
|
|
|
#ifndef MAGICBLOOM_NODIRT
|
|
#define MAGICBLOOM_NODIRT 0
|
|
#endif
|
|
|
|
// #ifndef MAGICBLOOM_NOADAPT
|
|
#define MAGICBLOOM_NOADAPT 0
|
|
// #endif
|
|
|
|
#define iBlurSamples 4
|
|
float iAdaptResolution = MAGICBLOOM_ADAPT_RESOLUTION;
|
|
|
|
// #define CONST_LOG2(v) (((v) & 0xAAAAAAAA) != 0) | ((((v) & 0xFFFF0000) != 0) << 4) | ((((v) & 0xFF00FF00) != 0) << 3) | ((((v) & 0xF0F0F0F0) != 0) << 2) | ((((v) & 0xCCCCCCCC) != 0) << 1)
|
|
#define CONST_LOG2(v) log2(v)
|
|
|
|
int sigma = int(float(iBlurSamples) / 2.0);
|
|
float double_pi = 6.283185307179586476925286766559;
|
|
float lowest_mip = CONST_LOG2(iAdaptResolution) + 1;
|
|
vec3 luma_value = vec3(0.2126, 0.7152, 0.0722);
|
|
|
|
|
|
layout(push_constant) uniform Push
|
|
{
|
|
vec4 SourceSize;
|
|
vec4 OriginalSize;
|
|
vec4 OutputSize;
|
|
uint FrameCount;
|
|
float ApplyBloom;
|
|
float fExposure;
|
|
float iDebug;
|
|
float fDirt_Intensity;
|
|
} params;
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
} global;
|
|
|
|
#pragma parameter ApplyBloom " Apply Bloom" 1 0 1 1
|
|
#define ApplyBloom params.ApplyBloom
|
|
|
|
#pragma parameter fExposure " Exposure" 0.2 0 1 0.001
|
|
#define fExposure params.fExposure
|
|
|
|
#pragma parameter fDirt_Intensity " Dirt Intensity" 0 0 1 0.001
|
|
#define fDirt_Intensity params.fDirt_Intensity
|
|
|
|
#pragma parameter iDebug " Debug: Show Blur Pass" 0 0 1 1
|
|
#define iDebug params.iDebug
|
|
|
|
#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;
|
|
layout(set = 0, binding = 3) uniform sampler2D PreBloomPass;
|
|
layout(set = 0, binding = 4) uniform sampler2D tMagicBloom_1;
|
|
layout(set = 0, binding = 5) uniform sampler2D tMagicBloom_2;
|
|
layout(set = 0, binding = 6) uniform sampler2D tMagicBloom_3;
|
|
layout(set = 0, binding = 7) uniform sampler2D tMagicBloom_4;
|
|
layout(set = 0, binding = 8) uniform sampler2D tMagicBloom_5;
|
|
layout(set = 0, binding = 9) uniform sampler2D tMagicBloom_6;
|
|
layout(set = 0, binding = 10) uniform sampler2D tMagicBloom_7;
|
|
layout(set = 0, binding = 11) uniform sampler2D tMagicBloom_8;
|
|
layout(set = 0, binding = 12) uniform sampler2D tMagicBloom_Adapt;
|
|
layout(set = 0, binding = 13) uniform sampler2D tMagicBloom_Dirt;
|
|
|
|
//Functions
|
|
|
|
/*
|
|
Uncharted 2 Tonemapper
|
|
Thanks John Hable and Naughty Dog.
|
|
*/
|
|
vec3 tonemap(vec3 col, float exposure) {
|
|
const float A = 0.15; //shoulder strength
|
|
const float B = 0.50; //linear strength
|
|
const float C = 0.10; //linear angle
|
|
const float D = 0.20; //toe strength
|
|
const float E = 0.02; //toe numerator
|
|
const float F = 0.30; //toe denominator
|
|
const float W = 11.2; //linear white point value
|
|
|
|
col *= exposure;
|
|
|
|
col = ((col * (A * col + C * B) + D * E) / (col * (A * col + B) + D * F)) - E / F;
|
|
const float white = 1.0 / (((W * (A * W + C * B) + D * E) / (W * (A * W + B) + D * F)) - E / F);
|
|
col *= white;
|
|
return col;
|
|
}
|
|
|
|
vec3 blend_screen(vec3 a, vec3 b) {
|
|
return 1.0 - (1.0 - a) * (1.0 - b);
|
|
}
|
|
|
|
//Final blend shader
|
|
vec4 PS_Blend(vec2 uv){
|
|
vec3 col = texture(PreBloomPass, uv).rgb;
|
|
vec3 bloom = 0
|
|
+ texture(tMagicBloom_1, uv).rgb
|
|
+ texture(tMagicBloom_2, uv).rgb
|
|
+ texture(tMagicBloom_3, uv).rgb
|
|
+ texture(tMagicBloom_4, uv).rgb
|
|
+ texture(tMagicBloom_5, uv).rgb
|
|
+ texture(tMagicBloom_6, uv).rgb
|
|
+ texture(tMagicBloom_7, uv).rgb
|
|
+ texture(tMagicBloom_8, uv).rgb;
|
|
bloom /= 8;
|
|
|
|
// TODO need to use the feedback, also the blend is possibly the last pass
|
|
// #if !MAGICBLOOM_NOADAPT
|
|
float exposure = fExposure / max(texture(tMagicBloom_Adapt, vec2(0.0)).x, 0.00001);
|
|
bloom = tonemap(bloom, exposure);
|
|
// #else
|
|
// Without adaptation it seems 100.0 exposure is needed for bloom to look bright enough.
|
|
// bloom = tonemap(bloom, 100.0);
|
|
// #endif
|
|
|
|
// // #if !MAGICBLOOM_NODIRT
|
|
vec3 dirt = texture(tMagicBloom_Dirt, uv).rgb;
|
|
dirt *= fDirt_Intensity;
|
|
bloom = blend_screen(bloom, dirt * bloom);
|
|
// // #endif
|
|
|
|
col = blend_screen(col, bloom);
|
|
|
|
// If we're to display the bloom texture, we replace col with it.
|
|
col = iDebug == 1 ? bloom : col;
|
|
|
|
// col = pow(abs(col), vec3(1/2.2));
|
|
|
|
return vec4(col, 1.0);
|
|
}
|
|
|
|
void main()
|
|
{
|
|
if (ApplyBloom < 1){
|
|
FragColor = texture(PreBloomPass, vTexCoord);
|
|
// FragColor = pow(abs(FragColor), vec4(1/2.2));
|
|
return;
|
|
}
|
|
|
|
FragColor = PS_Blend(vTexCoord);
|
|
// FragColor = pow(abs(FragColor), vec4(1/2.2));
|
|
}
|