mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-10-17 15:21:31 +11:00
95 lines
2.8 KiB
Plaintext
95 lines
2.8 KiB
Plaintext
#version 450
|
|
|
|
// white point adjustment
|
|
// by hunterk
|
|
// based on blog post by Tanner Helland
|
|
// http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
|
|
|
|
layout(push_constant) uniform Push
|
|
{
|
|
vec4 SourceSize;
|
|
vec4 OriginalSize;
|
|
vec4 OutputSize;
|
|
uint FrameCount;
|
|
float temperature;
|
|
float luma_preserve;
|
|
float wp_red;
|
|
float wp_green;
|
|
float wp_blue;
|
|
} params;
|
|
|
|
#pragma parameter temperature "White Point" 6500.0 0.0 12000.0 100.0
|
|
#pragma parameter luma_preserve "Preserve Luminance" 1.0 0.0 1.0 1.0
|
|
#pragma parameter wp_red "Red Shift" 0.0 -1.0 1.0 0.01
|
|
#pragma parameter wp_green "Green Shift" 0.0 -1.0 1.0 0.01
|
|
#pragma parameter wp_blue "Blue Shift" 0.0 -1.0 1.0 0.01
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
} global;
|
|
|
|
#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;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 vTexCoord;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D Source;
|
|
|
|
// white point adjustment
|
|
// based on blog post by Tanner Helland
|
|
// http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
|
|
vec3 wp_adjust(vec3 color){
|
|
const float target_white_point = 9300.0;
|
|
const mat3 RGBtoYIQ = mat3(
|
|
0.2989, 0.5870, 0.1140,
|
|
0.5959, -0.2744, -0.3216,
|
|
0.2115, -0.5229, 0.3114);
|
|
|
|
const mat3 YIQtoRGB = mat3(
|
|
1.0, 0.956, 0.6210,
|
|
1.0, -0.2720, -0.6474,
|
|
1.0, -1.1060, 1.7046);
|
|
|
|
float temp = params.temperature / 100.0;
|
|
|
|
// all calculations assume a scale of 255. We'll normalize this at the end
|
|
vec3 wp = vec3(255.);
|
|
|
|
// calculate RED
|
|
wp.r = (temp <= 66.) ? 255. : 329.698727446 * pow((temp - 60.), -0.1332047592);
|
|
|
|
// calculate GREEN
|
|
wp.g = (temp <= 66.) ? 99.4708025861 * log(temp) - 161.1195681661 : 288.1221695283 * pow((temp - 60.), -0.0755148492);
|
|
|
|
// calculate BLUE
|
|
wp.b = (temp >= 66.) ? 255. : (temp <= 19.) ? 0. : 138.5177312231 * log(temp - 10.) - 305.0447927307;
|
|
|
|
// clamp and normalize
|
|
wp.rgb = clamp(wp.rgb, vec3(0.), vec3(255.)) / vec3(255.);
|
|
|
|
// this is dumb, but various cores don't always show white as white. Use this to make white white...
|
|
wp.rgb += vec3(params.wp_red, params.wp_green, params.wp_blue);
|
|
|
|
// apply transformation
|
|
vec3 adjusted = (color * wp);
|
|
vec3 base_luma = color * RGBtoYIQ;
|
|
vec3 adjusted_luma = adjusted * RGBtoYIQ;
|
|
adjusted = (params.luma_preserve > 0.5) ? adjusted_luma + (vec3(base_luma.r,0.,0.) - vec3(adjusted_luma.r,0.,0.)) : adjusted_luma;
|
|
|
|
return adjusted * YIQtoRGB;
|
|
}
|
|
|
|
void main()
|
|
{
|
|
FragColor = vec4(wp_adjust(texture(Source, vTexCoord).rgb), 1.0);
|
|
} |