mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-10-18 07:41:31 +11:00
144 lines
8.1 KiB
Plaintext
144 lines
8.1 KiB
Plaintext
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#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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vec4 OriginalHistorySize1;
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vec4 OriginalHistorySize2;
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vec4 OriginalHistorySize3;
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vec4 OriginalHistorySize4;
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vec4 OriginalHistorySize5;
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vec4 OriginalHistorySize6;
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vec4 OriginalHistorySize7;
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} global;
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//config //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define baseline_alpha 0.10 //the alpha value of dots in their "off" state, does not affect the border region of the screen - [0, 1]
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#define response_time 0.333 //simulate response time, higher values result in longer color transition periods - [0, 1]
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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 tex;
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layout(location = 2) out vec2 dot_size;
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layout(location = 3) out vec2 one_texel;
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//vertex definitions //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define video_scale floor(global.OutputSize.y / global.SourceSize.y) //largest integer scale of input video that will fit in the current output (y axis would typically be limiting on widescreens)
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#define scaled_video_out (global.SourceSize.xy * vec2(video_scale)) //size of the scaled video
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#define half_pixel (vec2(0.5) / global.OutputSize.xy) //it's... half a pixel
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void main()
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{
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gl_Position = global.MVP * Position / vec4(vec2(global.OutputSize.xy / scaled_video_out), 1.0, 1.0 );
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vTexCoord = TexCoord + half_pixel;
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tex = floor(global.OriginalHistorySize1.xy * vTexCoord);
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tex = (tex + 0.5) * global.OriginalHistorySize1.zw;
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dot_size = 1.0 / global.SourceSize.xy;
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one_texel = 1.0 / (global.SourceSize.xy * video_scale);
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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 tex;
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layout(location = 2) in vec2 dot_size;
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layout(location = 3) in vec2 one_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 OriginalHistory1;
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layout(set = 0, binding = 4) uniform sampler2D OriginalHistory2;
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layout(set = 0, binding = 5) uniform sampler2D OriginalHistory3;
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layout(set = 0, binding = 6) uniform sampler2D OriginalHistory4;
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layout(set = 0, binding = 7) uniform sampler2D OriginalHistory5;
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layout(set = 0, binding = 8) uniform sampler2D OriginalHistory6;
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layout(set = 0, binding = 9) uniform sampler2D OriginalHistory7;
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//fragment definitions //
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define foreground_color vec3(0.11, 0.4141, 0.41) //tex2D(COLOR_PALETTE, fixed2(0.75, 0.5)).rgb //hardcoded to look up the foreground color from the right half of the palette image
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//#define rgb_to_alpha(rgb) ( ((rgb.r + rgb.g + rgb.b) / 3.0) + (is_on_dot * vec2(baseline_alpha), 1.0) ) //averages rgb values (allows it to work with color games), modified for contrast and base alpha
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//frame sampling definitions
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#define curr_rgb abs(1.0 - texture(Source, vTexCoord).rgb)
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#define prev0_rgb abs(1.0 - texture(OriginalHistory1, tex).rgb)
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#define prev1_rgb abs(1.0 - texture(OriginalHistory2, tex).rgb)
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#define prev2_rgb abs(1.0 - texture(OriginalHistory3, tex).rgb)
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#define prev3_rgb abs(1.0 - texture(OriginalHistory4, tex).rgb)
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#define prev4_rgb abs(1.0 - texture(OriginalHistory5, tex).rgb)
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#define prev5_rgb abs(1.0 - texture(OriginalHistory6, tex).rgb)
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#define prev6_rgb abs(1.0 - texture(OriginalHistory7, tex).rgb)
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void main()
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{
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//determine if the corrent texel lies on a dot or in the space between dots
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float is_on_dot;
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if ( mod(vTexCoord.x, dot_size.x) > one_texel.x && mod(vTexCoord.y, dot_size.y) > one_texel.y )
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{is_on_dot = 1.0;}
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else
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{is_on_dot = 0.0;}
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//sample color from the current and previous frames, apply response time modifier
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//response time effect implmented through an exponential dropoff algorithm
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vec3 input_rgb = curr_rgb;
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input_rgb += (prev0_rgb - input_rgb) * response_time;
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input_rgb += (prev1_rgb - input_rgb) * pow(response_time, 2.0);
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input_rgb += (prev2_rgb - input_rgb) * pow(response_time, 3.0);
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input_rgb += (prev3_rgb - input_rgb) * pow(response_time, 4.0);
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input_rgb += (prev4_rgb - input_rgb) * pow(response_time, 5.0);
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input_rgb += (prev5_rgb - input_rgb) * pow(response_time, 6.0);
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input_rgb += (prev6_rgb - input_rgb) * pow(response_time, 7.0);
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vec2 rgb_to_alpha = vec2((input_rgb.r + input_rgb.g + input_rgb.b) / 3.0) + (is_on_dot * baseline_alpha);
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//apply foreground color and assign alpha value
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vec4 out_color = vec4(foreground_color, rgb_to_alpha); //apply the foreground color to all texels (the color will be modified by alpha later) and assign alpha based on rgb input
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//overlay the matrix
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out_color.a *= is_on_dot; //if the fragment is not on a dot, set its alpha value to 0
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//return fragment color
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FragColor = vec4(out_color);
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}
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