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lcd1x+natural_vision.dsd
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// lcd1x+natural_vision - Simple LCD 'scanline' shader, based on lcd3x
//
// - Original lcd3x code by Gigaherz, released into the public domain
//
// - Original 'natural_vision' code written by ShadX, modified by
// Hyllian and Sp00kyFox, released into the public domain
//
// 'Ported' (i.e. copy/paste) to DraStic format by jdgleaver
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
//
// lcd1x+natural_vision differs from lcd3x in the following manner:
//
// > Omits LCD-style colour separation
//
// > Has 'correctly' aligned scanlines
//
// > Automatically supports 'high resolution 3d rendering' ON or OFF
//
// > Applies 'Natural Vision' colour enhancement
=============================================
<vertex>
attribute vec2 a_vertex_coordinate;
attribute vec2 a_texture_coordinate;
uniform vec4 u_texture_size;
varying vec2 v_texture_coordinate;
void main()
{
v_texture_coordinate = a_texture_coordinate;
gl_Position = vec4(a_vertex_coordinate.xy, 0.0, 1.0);
}
</vertex>
<fragment>
#ifndef BRIGHTEN_SCANLINES
#define BRIGHTEN_SCANLINES 16.0
#endif
#ifndef BRIGHTEN_LCD
#define BRIGHTEN_LCD 4.0
#endif
#ifndef NATVIS_GIN
#define NATVIS_GIN 1.91
#endif
#ifndef NATVIS_GOUT
#define NATVIS_GOUT 1.91
#endif
#ifndef NATVIS_Y
#define NATVIS_Y 1.1
#endif
#ifndef NATVIS_I
#define NATVIS_I 1.1
#endif
#ifndef NATVIS_Q
#define NATVIS_Q 1.1
#endif
#define PI 3.141592654
uniform sampler2D u_texture;
uniform vec4 u_texture_size;
varying vec2 v_texture_coordinate;
const float NDS_SCREEN_HEIGHT = 192.0;
const float INV_BRIGHTEN_SCANLINES_INC = 1.0 / (BRIGHTEN_SCANLINES + 1.0);
const float INV_BRIGHTEN_LCD_INC = 1.0 / (BRIGHTEN_LCD + 1.0);
// Natural Vision helpers
const mat3 RGBtoYIQ = mat3(0.299, 0.595716, 0.211456,
0.587, -0.274453, -0.522591,
0.114, -0.321263, 0.311135);
const mat3 YIQtoRGB = mat3(1.0, 1.0, 1.0,
0.95629572,-0.27212210,-1.10698902,
0.62102442,-0.64738060, 1.70461500);
const vec3 YIQ_lo = vec3(0.0, -0.595716, -0.522591);
const vec3 YIQ_hi = vec3(1.0, 0.595716, 0.522591);
void main()
{
// Note to self: uniform vec4 u_texture_size(1.0/w, 1.0/h, w, h)
// Generate LCD grid effect
// > Note the 0.25 pixel offset -> required to ensure that
// scanlines occur *between* pixels
// > Divide pixel coordinate by current scale factor (texture_height / NDS_SCREEN_HEIGHT)
vec2 angle = 2.0 * PI * (((v_texture_coordinate.xy * u_texture_size.zw) * NDS_SCREEN_HEIGHT * u_texture_size.y) - 0.25);
float yfactor = (BRIGHTEN_SCANLINES + sin(angle.y)) * INV_BRIGHTEN_SCANLINES_INC;
float xfactor = (BRIGHTEN_LCD + sin(angle.x)) * INV_BRIGHTEN_LCD_INC;
// Get colour sample and apply colour enhancement
vec3 colour = pow(texture2D(u_texture, v_texture_coordinate.xy).rgb, vec3(NATVIS_GIN));
colour = RGBtoYIQ * colour;
colour = vec3(pow(colour.x, NATVIS_Y), colour.y * NATVIS_I, colour.z * NATVIS_Q);
colour = clamp(colour, YIQ_lo, YIQ_hi);
colour = YIQtoRGB * colour;
colour = pow(colour, vec3(1.0 / NATVIS_GOUT));
// Apply LCD grid effect
colour.rgb = yfactor * xfactor * colour.rgb;
gl_FragColor = vec4(colour.rgb, 1.0);
}
</fragment>