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https://github.com/libretro/slang-shaders.git
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f7cf08900e
This variable determines how pixels are blended and affects the appearance of the pixel grid. The original Cg gameboy shader defaulted to Blending Mode 0. While a matter of preference, I find Blending Mode 0 looks better across a wider range of resolutions (especially handheld, lower resolution devices) and doesn't wash out the image like Blending Mode 1.
137 lines
6.3 KiB
Plaintext
137 lines
6.3 KiB
Plaintext
#version 450
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layout(push_constant) uniform Push
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{
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vec4 OutputSize;
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vec4 OriginalSize;
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vec4 SourceSize;
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float blending_mode;
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float adjacent_texel_alpha_blending;
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} registers;
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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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} global;
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////////////////////////////////////////////////////////////////////////////////
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// Config //
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////////////////////////////////////////////////////////////////////////////////
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// 0 - only the space between dots is blending
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// 1 - all texels are blended
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/* TODO/FIXME - When set to zero, frame will be a solid green color */
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#pragma parameter blending_mode "Blending Mode" 0.0 0.0 1.0 1.0
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// The amount of alpha swapped between neighboring texels
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#pragma parameter adjacent_texel_alpha_blending "Neighbor Blending" 0.1755 0.0 1.0 0.05
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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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////////////////////////////////////////////////////////////////////////////////
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// Vertex shader //
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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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layout(location = 2) out vec2 blur_coords_up;
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layout(location = 3) out vec2 blur_coords_down;
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layout(location = 4) out vec2 blur_coords_right;
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layout(location = 5) out vec2 blur_coords_left;
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layout(location = 6) out vec2 blur_coords_lower_bound;
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layout(location = 7) out vec2 blur_coords_upper_bound;
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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 * 1.0001;
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texel = registers.SourceSize.zw;
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blur_coords_down = vTexCoord + vec2(0.0, texel.y);
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blur_coords_up = vTexCoord + vec2(0.0, -texel.y);
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blur_coords_right = vTexCoord + vec2(texel.x, 0.0);
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blur_coords_left = vTexCoord + vec2(-texel.x, 0.0);
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blur_coords_lower_bound = vec2(0.0);
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blur_coords_upper_bound = texel * (registers.OutputSize.xy - vec2(2.0));
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}
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////////////////////////////////////////////////////////////////////////////////
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// Fragment shader //
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////////////////////////////////////////////////////////////////////////////////
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#pragma stage fragment
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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 = 2) in vec2 blur_coords_up;
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layout(location = 3) in vec2 blur_coords_down;
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layout(location = 4) in vec2 blur_coords_right;
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layout(location = 5) in vec2 blur_coords_left;
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layout(location = 6) in vec2 blur_coords_lower_bound;
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layout(location = 7) in vec2 blur_coords_upper_bound;
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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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////////////////////////////////////////////////////////////////////////////////
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// Fragment definitions //
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////////////////////////////////////////////////////////////////////////////////
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float blending_modifier(float color){
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float blend_bool = (color == 0.0) ? 1 : 0;
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return clamp(blend_bool + registers.blending_mode, 0.0, 1.0);
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}
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void main()
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{
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// A simple blur technique that softens harsh color transitions
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// Specialized to only blur alpha values and limited to only blurring texels
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// lying in the spaces between two or more texels
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// Sample the input textures
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vec4 out_color = texture(Source, vTexCoord).rgba;
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// Clamp the blur coords to the input texture size so it doesn't attempt to sample off the texture (it'll retrieve float4(0.0) and darken the edges otherwise)
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vec2 blur_coords_up_clamped = clamp(blur_coords_up, blur_coords_lower_bound, blur_coords_upper_bound);
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vec2 blur_coords_down_clamped = clamp(blur_coords_down, blur_coords_lower_bound, blur_coords_upper_bound);
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vec2 blur_coords_right_clamped = clamp(blur_coords_right, blur_coords_lower_bound, blur_coords_upper_bound);
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vec2 blur_coords_left_clamped = clamp(blur_coords_left, blur_coords_lower_bound, blur_coords_upper_bound);
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//Sample adjacent texels based on the coordinates above
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vec4 adjacent_texel_1 = texture(Source, blur_coords_up_clamped).rgba;
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vec4 adjacent_texel_2 = texture(Source, blur_coords_down_clamped).rgba;
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vec4 adjacent_texel_3 = texture(Source, blur_coords_right_clamped).rgba;
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vec4 adjacent_texel_4 = texture(Source, blur_coords_left_clamped).rgba;
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// Sum the alpha differences between neighboring texels, apply modifiers, then subtract the result from the current fragment alpha value
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out_color.a -=
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(
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(out_color.a - adjacent_texel_1.a) +
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(out_color.a - adjacent_texel_2.a) +
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(out_color.a - adjacent_texel_3.a) +
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(out_color.a - adjacent_texel_4.a)
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) * registers.adjacent_texel_alpha_blending * blending_modifier(out_color.a);
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FragColor = out_color;
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}
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