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https://github.com/italicsjenga/slang-shaders.git
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107 lines
6.1 KiB
Plaintext
107 lines
6.1 KiB
Plaintext
#version 450
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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vec4 OutputSize;
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vec4 OriginalSize;
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vec4 SourceSize;
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} global;
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//config //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define contrast 0.95 //useful to fine-tune the colors. higher values make the "black" color closer to black - [0, 1] [DEFAULT: 0.95]
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#define screen_light 1.00 //controls the ambient light of the screen. lower values darken the screen - [0, 2] [DEFAULT: 1.00]
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#define pixel_opacity 1.00 //controls the opacity of the dot-matrix pixels. lower values make pixels more transparent - [0, 1] [DEFAULT: 1.00]
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#define bg_smoothing 0.75 //higher values suppress changes in background color directly beneath the foreground to improve image clarity - [0, 1] [DEFAULT: 0.75]
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#define shadow_opacity 0.55 //how strongly shadows affect the background, higher values darken the shadows - [0, 1] [DEFAULT: 0.55]
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#define shadow_offset_x 1.0 //how far the shadow should be shifted to the right in pixels - [-infinity, infinity] [DEFAULT: 1.0]
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#define shadow_offset_y 1.0 //how far the shadow should be shifted to down in pixels - [-infinity, infinity] [DEFAULT: 1.5]
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#define screen_offset_x 0 //screen offset - [-infinity, infinity] [DEFAULT: 0]
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#define screen_offset_y 0 //screen offset - [-infinity, infinity] [DEFAULT: 0]
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///////////////////////////////////////////////////////////////////////////
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// //
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// Gameboy Classic Shader v0.2.2 //
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// //
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// Copyright (C) 2013 Harlequin : unknown92835@gmail.com //
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// //
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// This program is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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// //
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///////////////////////////////////////////////////////////////////////////
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 vTexCoord;
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layout(location = 1) out vec2 texel;
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = TexCoord;
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texel = 1.0 / global.SourceSize.xy;
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}
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#pragma stage fragment
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//fragment definitions //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define bg_color vec4(0.625, 0.664, 0.02, 1.0) //tex2D(COLOR_PALETTE, vec2(0.25, 0.5)) //sample the background color from the palette
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#define shadow_alpha (contrast * shadow_opacity) //blending factor used when overlaying shadows on the background
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#define shadow_offset vec2(shadow_offset_x * texel.x, shadow_offset_y * texel.y) //offset for the shadow
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#define screen_offset vec2(screen_offset_x * texel.x, screen_offset_y * texel.y) //offset for the entire screen
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//fragment shader //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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layout(location = 0) in vec2 vTexCoord;
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layout(location = 1) in vec2 texel;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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layout(set = 0, binding = 3) uniform sampler2D PassOutput1;
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void main()
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{
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//sample all the relevant textures
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vec4 foreground = texture(PassOutput1, vTexCoord - screen_offset);
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vec4 background = vec4(0.5); //hardcoded value rather than LUT
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vec4 shadows = texture(Source, vTexCoord - (shadow_offset + screen_offset));
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vec4 background_color = bg_color;
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//foreground and background are blended with the background color
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foreground *= bg_color;
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float bg_test = 0.0;
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if ( foreground.a > 0.0 )
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{ bg_test = 1.0; }
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background -= (background - 0.5) * bg_smoothing * bg_test;
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background.rgb = clamp(vec3( //allows for highlights, background = bg_color when the background color is 0.5 gray
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bg_color.r + mix(-1.0, 1.0, background.r),
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bg_color.g + mix(-1.0, 1.0, background.g),
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bg_color.b + mix(-1.0, 1.0, background.b) ), 0.0, 1.0);
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//shadows are alpha blended with the background
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vec4 out_color = (shadows * shadows.a * shadow_alpha) + (background * (1.0 - shadows.a * shadow_alpha));
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//foreground is alpha blended with the shadowed background
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out_color = (foreground * foreground.a * contrast) + (out_color * (screen_light - foreground.a * contrast * pixel_opacity));
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FragColor = vec4(out_color);
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}
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