#version 120 /* dugan_CRT-EasyMode_tweaked.glsl dugan's ScanLine shader adapted by liPillON for usage with DosBox SVN r4319 and later no tweaks source shader files: https://github.com/duganchen/dosbox_shaders/blob/master/scanline.frag https://github.com/duganchen/dosbox_shaders/blob/master/scanline.vert first posted here: https://www.vogons.org/viewtopic.php?f=32&t=72697 */ #if defined(VERTEX) #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 uniform vec2 rubyTextureSize; uniform vec2 rubyInputSize; uniform vec2 rubyOutputSize; COMPAT_ATTRIBUTE vec4 a_position; COMPAT_VARYING vec2 v_texCoord; COMPAT_VARYING vec2 omega; void main() { gl_Position = a_position; v_texCoord = vec2(a_position.x+1.0,1.0-a_position.y)/2.0*rubyInputSize/rubyTextureSize; omega = vec2(3.1415 * rubyOutputSize.x * rubyTextureSize.x / rubyInputSize.x, 2.0 * 3.1415 * rubyTextureSize.y); } #elif defined(FRAGMENT) #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 highp #else #define COMPAT_PRECISION #endif const float SCANLINE_BASE_BRIGHTNESS = 0.95; const float SCANLINE_SINE_COMP_A = 0.05; const float SCANLINE_SINE_COMP_B = 0.15; COMPAT_VARYING vec2 v_texCoord; uniform sampler2D rubyTexture; COMPAT_VARYING vec2 omega; void main() { vec2 sine_comp = vec2(SCANLINE_SINE_COMP_A, SCANLINE_SINE_COMP_B); vec3 res = COMPAT_TEXTURE(rubyTexture, v_texCoord).xyz; vec3 scanline = res * (SCANLINE_BASE_BRIGHTNESS + dot(sine_comp * sin(v_texCoord * omega), vec2(1.0, 1.0))); FragColor = vec4(scanline.x, scanline.y, scanline.z, 1.0); } #endif