/////////////////////////////////////////////////////////////////////////// // // // 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 . // // // /////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// // Config // //////////////////////////////////////////////////////////////////////////////// // The alpha value of dots in their "off" state // Does not affect the border region of the screen - [0, 1] #pragma parameter baseline_alpha "Baseline Alpha" 0.05 0.0 1.0 0.01 // Fine-tune the balance between the different shades of grey #pragma parameter grey_balance "Grey Balance" 2.6 2.0 4.0 0.1 // Simulate response time // Higher values result in longer color transition periods - [0, 1] #pragma parameter response_time "LCD Response Time" 0.20 0.0 0.777 0.111 // Set video scale when used in console-border shaders #pragma parameter video_scale "Video Scale" 3.0 3.0 5.0 1.0 #if defined(VERTEX) //////////////////////////////////////////////////////////////////////////////// // Vertex shader // //////////////////////////////////////////////////////////////////////////////// #if __VERSION__ >= 130 #define COMPAT_VARYING out #define COMPAT_ATTRIBUTE in #define COMPAT_TEXTURE texture #else #define COMPAT_VARYING varying #define COMPAT_ATTRIBUTE attribute #define COMPAT_TEXTURE texture2D #endif #ifdef GL_ES #define COMPAT_PRECISION mediump #else #define COMPAT_PRECISION #endif COMPAT_ATTRIBUTE vec4 VertexCoord; COMPAT_ATTRIBUTE vec4 COLOR; COMPAT_ATTRIBUTE vec4 TexCoord; COMPAT_VARYING vec4 COL0; COMPAT_VARYING vec4 TEX0; COMPAT_VARYING vec2 dot_size; COMPAT_VARYING vec2 one_texel; vec4 _oPosition1; uniform mat4 MVPMatrix; uniform COMPAT_PRECISION int FrameDirection; uniform COMPAT_PRECISION int FrameCount; uniform COMPAT_PRECISION vec2 OutputSize; uniform COMPAT_PRECISION vec2 TextureSize; uniform COMPAT_PRECISION vec2 InputSize; #ifdef PARAMETER_UNIFORM uniform COMPAT_PRECISION float baseline_alpha; uniform COMPAT_PRECISION float grey_balance; uniform COMPAT_PRECISION float response_time; uniform COMPAT_PRECISION float video_scale; #else #define baseline_alpha 0.10 #define grey_balance 3.0 #define response_time 0.333 #define video_scale 3.0 #endif //////////////////////////////////////////////////////////////////////////////// // Vertex definitions // //////////////////////////////////////////////////////////////////////////////// #define vTexCoord TEX0.xy #define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize #define outsize vec4(OutputSize, 1.0 / OutputSize) // Largest integer scale of input video that will fit in the current output (y axis would typically be limiting on widescreens) //#define video_scale floor(outsize.y * SourceSize.w) <- moved to parameter // Size of the scaled video //#define scaled_video_out (SourceSize.xy * vec2(video_scale)) <- moved to parameter //it's... half a pixel #define half_pixel (vec2(0.5) * outsize.zw) void main() { vec2 scaled_video_out = (InputSize.xy * vec2(video_scale)); // Remaps position to integer scaled output gl_Position = MVPMatrix * VertexCoord / vec4( vec2(outsize.xy / scaled_video_out), 1.0, 1.0 ); TEX0.xy = TexCoord.xy + half_pixel; dot_size = SourceSize.zw; one_texel = 1.0 / (SourceSize.xy * video_scale); } #elif defined(FRAGMENT) //////////////////////////////////////////////////////////////////////////////// // Fragment shader // //////////////////////////////////////////////////////////////////////////////// #if __VERSION__ >= 130 #define COMPAT_VARYING in #define COMPAT_TEXTURE texture out vec4 FragColor; #else #define COMPAT_VARYING varying #define FragColor gl_FragColor #define COMPAT_TEXTURE texture2D #endif #ifdef GL_ES #ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; #else precision mediump float; #endif #define COMPAT_PRECISION mediump #else #define COMPAT_PRECISION #endif uniform COMPAT_PRECISION int FrameDirection; uniform COMPAT_PRECISION int FrameCount; uniform COMPAT_PRECISION vec2 OutputSize; uniform COMPAT_PRECISION vec2 TextureSize; uniform COMPAT_PRECISION vec2 InputSize; uniform sampler2D Texture; uniform sampler2D COLOR_PALETTE; uniform sampler2D PrevTexture; uniform sampler2D Prev1Texture; uniform sampler2D Prev2Texture; uniform sampler2D Prev3Texture; uniform sampler2D Prev4Texture; uniform sampler2D Prev5Texture; uniform sampler2D Prev6Texture; COMPAT_VARYING vec4 TEX0; COMPAT_VARYING vec2 dot_size; COMPAT_VARYING vec2 one_texel; // compatibility #defines #define Source Texture #define vTexCoord TEX0.xy #define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize #define outsize vec4(OutputSize, 1.0 / OutputSize) #ifdef PARAMETER_UNIFORM uniform COMPAT_PRECISION float baseline_alpha; uniform COMPAT_PRECISION float grey_balance; uniform COMPAT_PRECISION float response_time; uniform COMPAT_PRECISION float console_border_enable; uniform COMPAT_PRECISION float video_scale; #endif //////////////////////////////////////////////////////////////////////////////// //fragment definitions // //////////////////////////////////////////////////////////////////////////////// #define foreground_color COMPAT_TEXTURE(COLOR_PALETTE, vec2(0.75, 0.5)).rgb //hardcoded to look up the foreground color from the right half of the palette image //#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 // Frame sampling definitions #define curr_rgb abs(1.0 - COMPAT_TEXTURE(Source, vTexCoord).rgb) #define prev0_rgb abs(1.0 - COMPAT_TEXTURE(PrevTexture, vTexCoord).rgb) #define prev1_rgb abs(1.0 - COMPAT_TEXTURE(Prev1Texture, vTexCoord).rgb) #define prev2_rgb abs(1.0 - COMPAT_TEXTURE(Prev2Texture, vTexCoord).rgb) #define prev3_rgb abs(1.0 - COMPAT_TEXTURE(Prev3Texture, vTexCoord).rgb) #define prev4_rgb abs(1.0 - COMPAT_TEXTURE(Prev4Texture, vTexCoord).rgb) #define prev5_rgb abs(1.0 - COMPAT_TEXTURE(Prev5Texture, vTexCoord).rgb) #define prev6_rgb abs(1.0 - COMPAT_TEXTURE(Prev6Texture, vTexCoord).rgb) void main() { // Determine if the corrent texel lies on a dot or in the space between dots float is_on_dot = 0.0; if ( mod(vTexCoord.x, dot_size.x) > one_texel.x && mod(vTexCoord.y, dot_size.y * 1.0001) > one_texel.y ) is_on_dot = 1.0; // Sample color from the current and previous frames, apply response time modifier // Response time effect implmented through an exponential dropoff algorithm vec3 input_rgb = curr_rgb; input_rgb += (prev0_rgb - input_rgb) * response_time; input_rgb += (prev1_rgb - input_rgb) * pow(response_time, 2.0); input_rgb += (prev2_rgb - input_rgb) * pow(response_time, 3.0); input_rgb += (prev3_rgb - input_rgb) * pow(response_time, 4.0); input_rgb += (prev4_rgb - input_rgb) * pow(response_time, 5.0); input_rgb += (prev5_rgb - input_rgb) * pow(response_time, 6.0); input_rgb += (prev6_rgb - input_rgb) * pow(response_time, 7.0); float rgb_to_alpha = (input_rgb.r + input_rgb.g + input_rgb.b) / grey_balance + (is_on_dot * baseline_alpha); // Apply foreground color and assign alpha value // Apply the foreground color to all texels - // the color will be modified by alpha later - and assign alpha based on rgb input vec4 out_color = vec4(foreground_color, rgb_to_alpha); // Overlay the matrix // If the fragment is not on a dot, set its alpha value to 0 out_color.a *= is_on_dot; FragColor = out_color; } #endif