slang-shaders/crt/shaders/fakelottes.slang

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2018-04-10 02:52:32 +10:00
#version 450
// Simple scanlines with curvature and mask effects lifted from crt-lottes
// by hunterk
////////////////////////////////////////////////////////////////////
//////////////////////////// SETTINGS ////////////////////////////
///// comment these lines to disable effects and gain speed //////
////////////////////////////////////////////////////////////////////
#define MASK // fancy, expensive phosphor mask effect
#define CURVATURE // applies barrel distortion to the screen
#define SCANLINES // applies horizontal scanline effect
//#define ROTATE_SCANLINES // for TATE games; also disables the mask effects, which look bad with it
#define EXTRA_MASKS // disable these if you need extra registers freed up
////////////////////////////////////////////////////////////////////
////////////////////////// END SETTINGS //////////////////////////
////////////////////////////////////////////////////////////////////
// prevent stupid behavior
#if defined ROTATE_SCANLINES && !defined SCANLINES
#define SCANLINES
#endif
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
float shadowMask;
float SCANLINE_SINE_COMP_B;
float warpX;
float warpY;
float maskDark;
float maskLight;
float crt_gamma;
float monitor_gamma;
float SCANLINE_SINE_COMP_A;
float SCANLINE_BASE_BRIGHTNESS;
} params;
#pragma parameter shadowMask "shadowMask" 1.0 0.0 4.0 1.0
#pragma parameter SCANLINE_SINE_COMP_B "Scanline Intensity" 0.40 0.0 1.0 0.05
#pragma parameter warpX "warpX" 0.031 0.0 0.125 0.01
#pragma parameter warpY "warpY" 0.041 0.0 0.125 0.01
#pragma parameter maskDark "maskDark" 0.5 0.0 2.0 0.1
#pragma parameter maskLight "maskLight" 1.5 0.0 2.0 0.1
#pragma parameter crt_gamma "CRT Gamma" 2.5 1.0 4.0 0.05
#pragma parameter monitor_gamma "Monitor Gamma" 2.2 1.0 4.0 0.05
#pragma parameter SCANLINE_SINE_COMP_A "Scanline Sine Comp A" 0.0 0.0 0.10 0.01
#pragma parameter SCANLINE_BASE_BRIGHTNESS "Scanline Base Brightness" 0.95 0.0 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;
vec4 scanline(vec2 coord, vec4 frame)
{
#if defined SCANLINES
vec2 omega = vec2(3.1415 * params.OutputSize.x, 2.0 * 3.1415 * params.SourceSize.y);
vec2 sine_comp = vec2(params.SCANLINE_SINE_COMP_A, params.SCANLINE_SINE_COMP_B);
vec3 res = frame.xyz;
#ifdef ROTATE_SCANLINES
sine_comp = sine_comp.yx;
omega = omega.yx;
#endif
vec3 scanline = res * (params.SCANLINE_BASE_BRIGHTNESS + dot(sine_comp * sin(coord * omega), vec2(1.0, 1.0)));
return vec4(scanline.x, scanline.y, scanline.z, 1.0);
#else
return frame;
#endif
}
#ifdef CURVATURE
// Distortion of scanlines, and end of screen alpha.
vec2 Warp(vec2 pos)
{
pos = pos*2.0-1.0;
pos *= vec2(1.0 + (pos.y*pos.y)*params.warpX, 1.0 + (pos.x*pos.x)*params.warpY);
return pos*0.5 + 0.5;
}
#endif
#if defined MASK && !defined ROTATE_SCANLINES
// Shadow mask.
vec4 Mask(vec2 pos)
{
vec3 mask = vec3(params.maskDark, params.maskDark, params.maskDark);
// Very compressed TV style shadow mask.
if (params.shadowMask == 1.0)
{
float line = params.maskLight;
float odd = 0.0;
if (fract(pos.x*0.166666666) < 0.5) odd = 1.0;
if (fract((pos.y + odd) * 0.5) < 0.5) line = params.maskDark;
pos.x = fract(pos.x*0.333333333);
if (pos.x < 0.333) mask.r = params.maskLight;
else if (pos.x < 0.666) mask.g = params.maskLight;
else mask.b = params.maskLight;
mask*=line;
}
// Aperture-grille.
else if (params.shadowMask == 2.0)
{
pos.x = fract(pos.x*0.333333333);
if (pos.x < 0.333) mask.r = params.maskLight;
else if (pos.x < 0.666) mask.g = params.maskLight;
else mask.b = params.maskLight;
}
#ifdef EXTRA_MASKS
// These can cause moire with curvature and scanlines
// so they're an easy target for freeing up registers
// Stretched VGA style shadow mask (same as prior shaders).
else if (params.shadowMask == 3.0)
{
pos.x += pos.y*3.0;
pos.x = fract(pos.x*0.166666666);
if (pos.x < 0.333) mask.r = params.maskLight;
else if (pos.x < 0.666) mask.g = params.maskLight;
else mask.b = params.maskLight;
}
// VGA style shadow mask.
else if (params.shadowMask == 4.0)
{
pos.xy = floor(pos.xy*vec2(1.0, 0.5));
pos.x += pos.y*3.0;
pos.x = fract(pos.x*0.166666666);
if (pos.x < 0.333) mask.r = params.maskLight;
else if (pos.x < 0.666) mask.g = params.maskLight;
else mask.b = params.maskLight;
}
#endif
else mask = vec3(1.,1.,1.);
return vec4(mask, 1.0);
}
#endif
void main()
{
#ifdef CURVATURE
vec2 pos = Warp(vTexCoord.xy);
#else
vec2 pos = vTexCoord.xy;
#endif
#if defined MASK && !defined ROTATE_SCANLINES
// mask effects look bad unless applied in linear gamma space
vec4 in_gamma = vec4(params.monitor_gamma, params.monitor_gamma, params.monitor_gamma, 1.0);
vec4 out_gamma = vec4(1.0 / params.crt_gamma, 1.0 / params.crt_gamma, 1.0 / params.crt_gamma, 1.0);
vec4 res = pow(texture(Source, pos), in_gamma);
#else
vec4 res = texture(Source, pos);
#endif
#if defined MASK && !defined ROTATE_SCANLINES
// apply the mask; looks bad with vert scanlines so make them mutually exclusive
res *= Mask(vTexCoord * params.OutputSize.xy * 1.0001);
#endif
#if defined MASK && !defined ROTATE_SCANLINES
// re-apply the gamma curve for the mask path
FragColor = pow(scanline(pos, res), out_gamma);
#else
FragColor = scanline(pos, res);
#endif
}