#version 450 layout(push_constant) uniform Push { vec4 OutputSize; vec4 OriginalSize; vec4 SourceSize; vec4 PassOutputSize1; float contrast; float screen_light; float pixel_opacity; float bg_smoothing; float shadow_opacity; float shadow_offset_x; float shadow_offset_y; float screen_offset_x; float screen_offset_y; } registers; layout(std140, set = 0, binding = 0) uniform UBO { mat4 MVP; } global; //////////////////////////////////////////////////////////////////////////////// // Config // //////////////////////////////////////////////////////////////////////////////// // Useful to fine-tune the colors. // Higher values make the "black" color closer to black - [0, 1] [DEFAULT: 0.95] #pragma parameter contrast "Contrast" 0.70 0.0 1.0 0.05 // Controls the ambient light of the screen. // Lower values darken the screen - [0, 2] [DEFAULT: 1.00] #pragma parameter screen_light "Ambient Screen Light" 0.85 0.0 2.0 0.05 // Controls the opacity of the dot-matrix pixels. // Lower values make pixels more transparent - [0, 1] [DEFAULT: 1.00] #pragma parameter pixel_opacity "Pixel Opacity" 0.9 0.01 1.0 0.01 // Higher values suppress changes in background color directly beneath // the foreground to improve image clarity - [0, 1] [DEFAULT: 0.75] #pragma parameter bg_smoothing "Background Smooth" 0.0 0.0 1.0 0.05 // How strongly shadows affect the background // Higher values darken the shadows - [0, 1] [DEFAULT: 0.55] #pragma parameter shadow_opacity "Shadow Opacity" 0.90 0.01 1.0 0.01 // How far the shadow should be shifted to the // right in pixels - [-infinity, infinity] [DEFAULT: 1.0] #pragma parameter shadow_offset_x "Shadow Offset Horiz" -1.5 -5.0 5.0 0.5 // How far the shadow should be shifted // down in pixels - [-infinity, infinity] [DEFAULT: 1.5] #pragma parameter shadow_offset_y "Shadow Offset Vert" 1.5 -5.0 5.0 0.5 // Screen offset - [-infinity, infinity] [DEFAULT: 0] #pragma parameter screen_offset_x "Screen Offset Horiz" 0.0 -5.0 5.0 0.5 // Screen offset - [-infinity, infinity] [DEFAULT: 0] #pragma parameter screen_offset_y "Screen Offset Vert" 0.0 -5.0 5.0 0.5 /////////////////////////////////////////////////////////////////////////// // // // Gameboy Classic Shader v0.2.2 // // // // Copyright (C) 2013 Harlequin : unknown92835@gmail.com // // // // 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 3 of the License, or // // (at your option) any later version. // // // // This program is distributed in the hope that it will be useful, // // but WITHOUT ANY WARRANTY; without even the implied warranty of // // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // // GNU General Public License for more details. // // // // You should have received a copy of the GNU General Public License // // along with this program. If not, see . // // // /////////////////////////////////////////////////////////////////////////// #pragma stage vertex layout(location = 0) in vec4 Position; layout(location = 1) in vec2 TexCoord; layout(location = 0) out vec2 vTexCoord; layout(location = 1) out vec2 texel; void main() { gl_Position = global.MVP * Position; vTexCoord = TexCoord; texel = registers.SourceSize.zw; } //////////////////////////////////////////////////////////////////////////////// // Fragment definitions // //////////////////////////////////////////////////////////////////////////////// #pragma stage fragment layout(location = 0) in vec2 vTexCoord; layout(location = 1) in vec2 texel; layout(location = 0) out vec4 FragColor; layout(set = 0, binding = 1) uniform sampler2D Source; layout(set = 0, binding = 2) uniform sampler2D PassOutput1; layout(set = 0, binding = 3) uniform sampler2D BACKGROUND; layout(set = 0, binding = 4) uniform sampler2D COLOR_PALETTE; #define bg_color texture(COLOR_PALETTE, vec2(0.25, 0.5)) // Sample the background color from the palette #define shadow_alpha (registers.contrast * registers.shadow_opacity) // Offset for the shadow #define shadow_offset vec2(registers.shadow_offset_x * texel.x, registers.shadow_offset_y * texel.y) // Offset for the entire screen #define screen_offset vec2(registers.screen_offset_x * texel.x, registers.screen_offset_y * texel.y) //////////////////////////////////////////////////////////////////////////////// // Fragment shader // //////////////////////////////////////////////////////////////////////////////// void main() { vec2 tex = floor(registers.PassOutputSize1.xy * vTexCoord); tex = (tex + 0.5) * registers.PassOutputSize1.zw; // Sample all the relevant textures vec4 foreground = texture(PassOutput1, tex - screen_offset); vec4 background = texture(BACKGROUND, vTexCoord); vec4 shadows = texture(Source, vTexCoord - (shadow_offset + screen_offset)); vec4 background_color = bg_color; // Foreground and background are blended with the background color foreground *= 1.0; background -= (background - 0.5) * registers.bg_smoothing * float(foreground.a > 0.0); //suppress drastic background color changes under the foreground to improve clarity // Allows for highlights, // background = bg_color when the background color is 0.5 gray background.rgb = clamp( vec3( bg_color.r + mix(-1.0, 1.0, background.r), bg_color.g + mix(-1.0, 1.0, background.g), bg_color.b + mix(-1.0, 1.0, background.b) ), 0.0, 1.0 ); // Shadows are alpha blended with the background vec4 out_color = (shadows * shadows.a * shadow_alpha) + (background * (1.0 - shadows.a * shadow_alpha)); // Foreground is alpha blended with the shadowed background out_color = (foreground * foreground.a * (1.0 - foreground.a * foreground.a * registers.contrast)) + (out_color * (registers.screen_light - foreground.a * registers.contrast * registers.pixel_opacity)); FragColor = out_color; }