You can make the pixel size an uniform: #ifdef GL_ES precision highp float; precision lowp int; #endif uniform float time; uniform sampler2D composite; uniform int renderpass; uniform vec2 mouse; uniform vec2 resolution; varying vec2 texcoord; uniform float pixelSize; // 4BIT COLOR // Maps into DawnBringer's 4-bit (16 color) palette http://www.pixeljoint.com/forum/forum_posts.asp?TID=12795 // Also see the amazing ASCII shadertoy: https://www.shadertoy.com/view/lssGDj float hash(vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); } float compare(vec3 a, vec3 b) { // Increase saturation a = max(vec3(0.0), a - min(a.r, min(a.g, a.b)) * 0.25); b = max(vec3(0.0), b - min(b.r, min(b.g, b.b)) * 0.25); a*=a*a; b*=b*b; vec3 diff = (a - b); return dot(diff, diff); } void main(void) { vec2 c = floor(texcoord * resolution / pixelSize); vec2 coord = c * pixelSize; vec3 src = texture2D(composite, coord / resolution.xy).rgb; // Track the two best colors vec3 dst0 = vec3(0), dst1 = vec3(0); float best0 = 1e3, best1 = 1e3; # define TRY(R, G, B) { const vec3 tst = vec3(R, G, B); float err = compare(src, tst); if (err < best0) { best1 = best0; dst1 = dst0; best0 = err; dst0 = tst; } } TRY(0.078431, 0.047059, 0.109804); TRY(0.266667, 0.141176, 0.203922); TRY(0.188235, 0.203922, 0.427451); TRY(0.305882, 0.290196, 0.305882); TRY(0.521569, 0.298039, 0.188235); TRY(0.203922, 0.396078, 0.141176); TRY(0.815686, 0.274510, 0.282353); TRY(0.458824, 0.443137, 0.380392); TRY(0.349020, 0.490196, 0.807843); TRY(0.823529, 0.490196, 0.172549); TRY(0.521569, 0.584314, 0.631373); TRY(0.427451, 0.666667, 0.172549); TRY(0.823529, 0.666667, 0.600000); TRY(0.427451, 0.760784, 0.792157); TRY(0.854902, 0.831373, 0.368627); TRY(0.870588, 0.933333, 0.839216); # undef TRY best0 = sqrt(best0); best1 = sqrt(best1); gl_FragColor = vec4(mod(c.x + c.y, 2.0) > (hash(c * 2.0 + fract(sin(vec2(floor(time), floor(time* 1.7))))) * 0.75) + (best1 / (best0 + best1)) ? dst1 : dst0, 1.0); }And then set it via lua:shader_effects["fourbit"] = { shader = Shaders["fourbit"].Compiled } shaderAddEffect("fourbit") bind("fourbit", "time", field("shader_iTime")) shader_effects["fourbit"].num.pixelSize = 1

Hello! I get this error after I put long code in shader compiler: "error X4000: variable 'outColor' used without having been completely initialized" What could be the problem?

sorry, I´m not expert with this code :DShould I add #ifdef GL_ES code in ShaderToolkit script at the end and add"shader_effects["fourbit"] = { shader = Shaders["fourbit"].Compiled } shaderAddEffect("fourbit") bind("fourbit", "time", field("shader_iTime"))" everytime I wanted to use the fourbit, right?and then play with pixelSize ?(I tried that and it didn´t work) 

Here's the code: #ifdef GL_ES precision highp float; precision lowp int; #endif uniform float time; uniform sampler2D composite; uniform int renderpass; uniform vec2 mouse; uniform vec2 resolution; varying vec2 texcoord; // 4BIT COLOR // Maps into DawnBringer's 4-bit (16 color) palette http://www.pixeljoint.com/forum/forum_posts.asp?TID=12795 // Also see the amazing ASCII shadertoy: https://www.shadertoy.com/view/lssGDj float hash(vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); } float compare(vec3 a, vec3 b) { // Increase saturation a = max(vec3(0.0), a - min(a.r, min(a.g, a.b)) * 0.25); b = max(vec3(0.0), b - min(b.r, min(b.g, b.b)) * 0.25); a*=a*a; b*=b*b; vec3 diff = (a - b); return dot(diff, diff); } void main(void) { const float pixelSize = 1.0; vec2 c = floor(texcoord * resolution / pixelSize); vec2 coord = c * pixelSize; vec3 src = texture2D(composite, coord / resolution.xy).rgb; // Track the two best colors vec3 dst0 = vec3(0), dst1 = vec3(0); float best0 = 1e3, best1 = 1e3; # define TRY(R, G, B) { const vec3 tst = vec3(R, G, B); float err = compare(src, tst); if (err < best0) { best1 = best0; dst1 = dst0; best0 = err; dst0 = tst; } } TRY(0.078431, 0.047059, 0.109804); TRY(0.266667, 0.141176, 0.203922); TRY(0.188235, 0.203922, 0.427451); TRY(0.305882, 0.290196, 0.305882); TRY(0.521569, 0.298039, 0.188235); TRY(0.203922, 0.396078, 0.141176); TRY(0.815686, 0.274510, 0.282353); TRY(0.458824, 0.443137, 0.380392); TRY(0.349020, 0.490196, 0.807843); TRY(0.823529, 0.490196, 0.172549); TRY(0.521569, 0.584314, 0.631373); TRY(0.427451, 0.666667, 0.172549); TRY(0.823529, 0.666667, 0.600000); TRY(0.427451, 0.760784, 0.792157); TRY(0.854902, 0.831373, 0.368627); TRY(0.870588, 0.933333, 0.839216); # undef TRY best0 = sqrt(best0); best1 = sqrt(best1); gl_FragColor = vec4(mod(c.x + c.y, 2.0) > (hash(c * 2.0 + fract(sin(vec2(floor(time), floor(time* 1.7))))) * 0.75) + (best1 / (best0 + best1)) ? dst1 : dst0, 1.0); } <font face="monospace"></font>There's pixelSize, I set to it to 1.0. Add this as a shader named fourbit in the shadertab, then you can use with this:shader_effects["fourbit"] = { shader = Shaders["fourbit"].Compiled }shaderAddEffect("fourbit")bind("fourbit", "time", field("shader_iTime"))

Edit the shader toolkit script & add this line at the top of the script...game.ShaderExclude = eShaderExcludeInterfacesIt should prevent the fx from effecting interfaces, mouse cursors, & texts. If you want it to affect interfaces, but not the mouse cursor & texts, then use this line of code instead...game.ShaderExclude = eShaderExcludeTextsAndCursor