update wlbg

scripts/wlbg/src/Gfx.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const c = @import("ffi.zig").c;
 
 const glutil = @import("glutil.zig");
+const options = @import("options.zig");
 
 const OutputInfo = @import("OutputInfo.zig");
 const OutputWindow = @import("OutputWindow.zig");
@@ -261,17 +262,19 @@ pub fn drawBackground(
 ) !void {
     // There's just about a 0% chance this works properly when monitors have different resolutions,
     // but I can't even begin thinking about that.
-    const xoff = @as(f32, @floatFromInt(info.x - base_off[0])) / @as(f32, @floatFromInt(info.width));
-    const yoff = @as(f32, @floatFromInt(info.y - base_off[1])) / @as(f32, @floatFromInt(info.height));
+    const off: struct { x: f32, y: f32 } = if (options.multihead_mode == .combined) .{
+        .x = @as(f32, @floatFromInt(info.x - base_off[0])) / @as(f32, @floatFromInt(info.width)),
+        .y = @as(f32, @floatFromInt(info.y - base_off[1])) / @as(f32, @floatFromInt(info.height)),
+    } else .{ .x = 0, .y = 0 };
 
     const vertices = [_]f32{
-        -1.0, -1.0, 0.0, xoff, yoff,
-        1.0,  -1.0, 0.0, xoff, yoff,
-        1.0,  1.0,  0.0, xoff, yoff,
+        -1.0, -1.0, 0.0,
+        1.0,  -1.0, 0.0,
+        1.0,  1.0,  0.0,
 
-        -1.0, -1.0, 0.0, xoff, yoff,
-        1.0,  1.0,  0.0, xoff, yoff,
-        -1.0, 1.0,  0.0, xoff, yoff,
+        -1.0, -1.0, 0.0,
+        1.0,  1.0,  0.0,
+        -1.0, 1.0,  0.0,
     };
 
     c.glBindFramebuffer(c.GL_FRAMEBUFFER, self.bg_bufs.get(output_idx).framebuffer);
@@ -281,12 +284,10 @@ pub fn drawBackground(
 
     c.glUseProgram(self.bg_shader_program);
 
-    c.glVertexAttribPointer(0, 3, c.GL_FLOAT, c.GL_FALSE, @sizeOf(f32) * 5, &vertices);
+    c.glVertexAttribPointer(0, 3, c.GL_FLOAT, c.GL_FALSE, 0, &vertices);
     c.glEnableVertexAttribArray(0);
 
-    c.glVertexAttribPointer(1, 2, c.GL_FLOAT, c.GL_FALSE, @sizeOf(f32) * 5, @ptrFromInt(@intFromPtr(&vertices) + @sizeOf(f32) * 3));
-    c.glEnableVertexAttribArray(1);
-
+    c.glUniform2f(c.glGetUniformLocation(self.bg_shader_program, "offset"), off.x, off.y);
     c.glUniform1f(c.glGetUniformLocation(self.bg_shader_program, "time"), rand * 2000.0 - 1000.0);
 
     c.glDrawArrays(c.GL_TRIANGLES, 0, vertices.len / 3);

scripts/wlbg/src/bg_frag.glsl

@@ -3,67 +3,77 @@
 precision highp float;
 
 uniform float time;
-uniform vec2 offset;
 
 in vec2 fragCoord;
 
-// shader: https://www.shadertoy.com/view/tsXBzS
+// shader: https://www.shadertoy.com/view/ttKGDt
 
-vec3 palette(float d){
-	return mix(vec3(0.2,0.0,0.0),vec3(.5,0.,0.),d);
+mat2 rot(float a) {
+    float c = cos(a), s = sin(a);
+    return mat2(c,s,-s,c);
 }
 
-vec2 rotate(vec2 p,float a){
-	float c = cos(a);
-    float s = sin(a);
-    return p*mat2(c,s,-s,c);
+const float pi = acos(-1.0);
+const float pi2 = pi*2.0;
+
+vec2 pmod(vec2 p, float r) {
+    float a = atan(p.x, p.y) + pi/r;
+    float n = pi2 / r;
+    a = floor(a/n)*n;
+    return p*rot(-a);
 }
 
-float map(vec3 p){
-    for( int i = 0; i<8; ++i){
-        float t = time*0.2;
-        p.xz =rotate(p.xz,t);
-        p.xy =rotate(p.xy,t*1.89);
-        p.xz = abs(p.xz);
-        p.xz-=.5;
-	}
-	return dot(sign(p),p)/5.;
+float box( vec3 p, vec3 b ) {
+    vec3 d = abs(p) - b;
+    return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
 }
 
-vec4 rm (vec3 ro, vec3 rd){
-    float t = 0.;
-    vec3 col = vec3(0.);
-    float d;
-    for(float i =0.; i<64.; i++){
-		vec3 p = ro + rd*t;
-        d = map(p)*.5;
-        if(d<0.02){
-            break;
-        }
-        if(d>100.){
-        	break;
-        }
-        //col+=vec3(0.6,0.8,0.8)/(400.*(d));
-        col+=palette(length(p)*.1)/(400.*(d));
-        t+=d;
+float ifsBox(vec3 p) {
+    for (int i=0; i<5; i++) {
+        p = abs(p) - 1.0;
+        p.xy *= rot(time*0.3);
+        p.xz *= rot(time*0.1);
     }
-    return vec4(col,1./(d*100.));
+    p.xz *= rot(time);
+    return box(p, vec3(0.4,0.8,0.3));
 }
-void main()
-{
-    vec2 uv = fragCoord / 5.0;
-	vec3 ro = vec3(0.,0.,-50.);
-    ro.xz = rotate(ro.xz,time);
-    vec3 cf = normalize(-ro);
-    vec3 cs = normalize(cross(cf,vec3(0.,1.,0.)));
-    vec3 cu = normalize(cross(cf,cs));
-    
-    vec3 uuv = ro+cf*3. + uv.x*cs + uv.y*cu;
-    
-    vec3 rd = normalize(uuv-ro);
-    
-    vec4 col = rm(ro,rd);
-    
-    
-    gl_FragColor = col;
+
+float map(vec3 p, vec3 cPos) {
+    vec3 p1 = p;
+    p1.x = mod(p1.x-5., 10.) - 5.;
+    p1.y = mod(p1.y-5., 10.) - 5.;
+    p1.z = mod(p1.z, 16.)-8.;
+    p1.xy = pmod(p1.xy, 5.0);
+    return ifsBox(p1);
+}
+
+void main() {
+    vec2 p = fragCoord;
+
+    vec3 cPos = vec3(0.0,0.0, -3.0 * time);
+    // vec3 cPos = vec3(0.3*sin(time*0.8), 0.4*cos(time*0.3), -6.0 * time);
+    vec3 cDir = normalize(vec3(0.0, 0.0, -1.0));
+    vec3 cUp  = vec3(sin(time), 1.0, 0.0);
+    vec3 cSide = cross(cDir, cUp);
+
+    vec3 ray = normalize(cSide * p.x + cUp * p.y + cDir);
+
+    float acc = 0.0;
+    float acc2 = 0.0;
+    float t = 0.0;
+    for (int i = 0; i < 99; i++) {
+        vec3 pos = cPos + ray * t;
+        float dist = map(pos, cPos);
+        dist = max(abs(dist), 0.02);
+        float a = exp(-dist*3.0);
+        if (mod(length(pos)+24.0*time, 30.0) < 3.0) {
+            a *= 2.0;
+            acc2 += a;
+        }
+        acc += a;
+        t += dist * 0.5;
+    }
+
+    vec3 col = vec3(acc * 0.001, acc * 0.001 + acc2*0.002, acc * 0.002+ acc2*0.005);
+    gl_FragColor = vec4(col, 1.0 - t * 0.03);
 }

scripts/wlbg/src/bg_vert.glsl

@@ -2,12 +2,13 @@
 
 precision mediump float;
 
+uniform vec2 offset;
+
 attribute vec4 vPos;
-attribute vec2 monitorOffset;
 
 out vec2 fragCoord;
 
 void main() {
     gl_Position = vPos;
-    fragCoord = vPos.xy + monitorOffset * 2.0;
+    fragCoord = vPos.xy + offset * 2.0;
 }

scripts/wlbg/src/main.zig

@@ -3,6 +3,7 @@ const xev = @import("xev");
 const wayland = @import("wayland");
 
 const c = @import("ffi.zig").c;
+const options = @import("options.zig");
 
 const Gfx = @import("Gfx.zig");
 const Globals = @import("Globals.zig");
@@ -18,8 +19,6 @@ pub const std_options = struct {
     pub const log_level = .debug;
 };
 
-const fps = 30;
-
 pub fn main() !void {
     std.log.info("initializing event loop", .{});
     var loop = try xev.Loop.init(.{});
@@ -141,21 +140,26 @@ pub fn main() !void {
     defer pointer.destroy();
     pointer.setListener(*PointerState, pointerListener, &pointer_state);
 
-    var total_width: i32 = 0;
-    var total_height: i32 = 0;
+    const base_offset: [2]i32 = off: {
+        if (comptime options.multihead_mode == .individual) break :off .{ 0, 0 };
 
-    for (output_info) |inf| {
-        const xmax = inf.x;
-        const ymax = inf.y;
+        var total_width: i32 = 0;
+        var total_height: i32 = 0;
+        for (output_info) |inf| {
+            const xmax = inf.x;
+            const ymax = inf.y;
 
-        if (xmax > total_width)
-            total_width = xmax;
-        if (ymax > total_height)
-            total_height = ymax;
-    }
+            if (xmax > total_width)
+                total_width = xmax;
+            if (ymax > total_height)
+                total_height = ymax;
+        }
 
-    const base_xoff = @divTrunc(total_width, 2);
-    const base_yoff = @divTrunc(total_height, 2);
+        break :off .{
+            @divTrunc(total_width, 2),
+            @divTrunc(total_height, 2),
+        };
+    };
 
     if (c.eglMakeCurrent(
         egl_dpy,
@@ -174,7 +178,7 @@ pub fn main() !void {
         .outputs = output_windows,
         .output_info = output_info,
         .last_time = loop.now(),
-        .base_offset = .{ base_xoff, base_yoff },
+        .base_offset = base_offset,
         .pointer_state = &pointer_state,
     };
 
@@ -238,7 +242,7 @@ fn renderCb(
     const delta_time = now - data.?.last_time;
     data.?.last_time = now;
 
-    resetXevTimerCompletion(completion, now, 1000 / fps);
+    resetXevTimerCompletion(completion, now, 1000 / options.fps);
 
     data.?.gfx.preDraw(
         delta_time,
@@ -287,11 +291,11 @@ fn renderBackgroundCb(
 ) xev.CallbackAction {
     result catch unreachable;
 
-    resetXevTimerCompletion(completion, loop.now(), std.time.ms_per_min);
+    resetXevTimerCompletion(completion, loop.now(), options.refresh_time);
 
-    const rand = std.crypto.random.float(f32);
-    for (data.?.outputs, data.?.output_info, 0..) |output, info, i| {
-        _ = output;
+    var rand: f32 = if (options.multihead_mode == .combined) std.crypto.random.float(f32) else 0.0;
+    for (data.?.output_info, 0..) |info, i| {
+        if (options.multihead_mode == .individual) rand = std.crypto.random.float(f32);
         data.?.gfx.drawBackground(
             info,
             i,

scripts/wlbg/src/options.zig

@@ -0,0 +1,10 @@
+const std = @import("std");
+
+// Framerate
+pub const fps = 30;
+
+// Draw backgrounds aligned with same value or individually with different val.
+pub const multihead_mode: enum { combined, individual } = .combined;
+
+// Time between background changes
+pub const refresh_time = std.time.ms_per_min * 5;