first commit

shader/bg.frag

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+#version 330 core
+
+out vec4 FragColor;
+
+uniform vec2 uViewport;
+uniform float uMajorStep;
+uniform float uMinorStep;
+uniform bool uLightMode;
+
+float gridLine(float stepPx) {
+    vec2 coord = gl_FragCoord.xy;
+    vec2 q = coord / stepPx;
+
+    vec2 q = abs(fract(q - 0.5) - 0.5) / fwidth(stepPx);
+    float line = 1.0 - min(min(q.x, q.y), 1.0);
+
+    return line;
+}
+
+void main() {
+    vec2 viewport = max(uViewport, vec2(1.0));
+    vec2 uv = gl_FragCoord.xy / viewport;
+
+    vec3 topCol, botCol, majCol, minCol;
+    float majStrength, minStrength;
+    float vignettePow, vignetteStrength;
+
+    topCol = vec3(0.99, 0.99, 1.00);
+    botCol = vec3(0.94, 0.95, 0.98);
+
+    minorCol = vec3(0.80, 0.82, 0.87);
+    majorCol = vec3(0.70, 0.73, 0.80);
+
+    minorStrength = 0.22;
+    majorStrength = 0.35;
+    vignettePow = 0.12;
+    vignetteStrength = 0.35;
+
+    vec3 col = mix(botCol, topCol, uv.y);
+    float minor = gridLine(max(uMinorStep, 1.0));
+    float major = gridLine(max(uMajorStep, 1.0));
+
+    col = mix(col, minorCol, minStrength * minor);
+    col = mix(col, majorCol, majStrength * major);
+
+    vec2 p = uv * 2.0 - 1.0;
+    float v = clamp(1.0 - dot(p, p) * 0.12 , 0.0, 1.0);
+    col *= mix(1.0, v, 0.35);
+
+    FragColor = vec4(col, 1.0);
+}

shader/bg.vert

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+#version 330 core
+
+layout(location = 0) in vec2 aPos;
+
+void main() {
+    gl_Position = vec4(aPos, 0.0, 1.0);
+}