Add feature for cursor and range rings

shaders/ascope_graticule.frag

@@ -0,0 +1,6 @@
+#version 330 core
+uniform vec3 uColor;
+out vec4 FragColor;
+void main() {
+    FragColor = vec4(uColor, 1.0);
+}

shaders/ascope_graticule.vert

@@ -0,0 +1,6 @@
+#version 330 core
+layout(location = 0) in vec2 aPos;
+uniform float uYOffset;
+void main() {
+    gl_Position = vec4(aPos.x, aPos.y + uYOffset, 0.0, 1.0);
+}

shaders/ascope_graticule_text.frag

@@ -0,0 +1,9 @@
+#version 330 core
+in vec2 vUV;
+uniform sampler2D uTexture;
+uniform vec3 uColor;
+out vec4 FragColor;
+void main() {
+    float alpha = texture(uTexture, vUV).r;
+    FragColor = vec4(uColor, alpha);
+}

shaders/ascope_graticule_text.vert

@@ -0,0 +1,9 @@
+#version 330 core
+layout(location = 0) in vec2 aPos;
+layout(location = 1) in vec2 aUV;
+uniform float uYOffset;
+out vec2 vUV;
+void main() {
+    gl_Position = vec4(aPos.x, aPos.y + uYOffset, 0.0, 1.0);
+    vUV = aUV;
+}

shaders/ppi_cursor.frag

@@ -0,0 +1,6 @@
+#version 330 core
+uniform vec3 uColor;
+out vec4 FragColor;
+void main() {
+    FragColor = vec4(uColor, 1.0);
+}

shaders/ppi_cursor.vert

@@ -0,0 +1,5 @@
+#version 330 core
+layout(location = 0) in vec2 aPos;
+void main() {
+    gl_Position = vec4(aPos, 0.0, 1.0);
+}

shaders/ppi_range_rings.frag

@@ -0,0 +1,6 @@
+#version 330 core
+in vec3 vColor;
+out vec4 fragColor;
+void main() {
+    fragColor = vec4(vColor, 1.0);
+}

shaders/ppi_range_rings.vert

@@ -0,0 +1,8 @@
+#version 330 core
+layout(location = 0) in vec2 aPos;
+layout(location = 1) in vec3 aColor;
+out vec3 vColor;
+void main() {
+    gl_Position = vec4(aPos, 0.0, 1.0);
+    vColor = aColor;
+}

shaders/ppi_targets.frag

@@ -0,0 +1,11 @@
+#version 330 core
+in vec2 vUV;         // [-1,1] range — distance from blob centre
+out vec4 fragColor;
+uniform vec3  uColor;
+uniform float uFalloff;  // gaussian width: larger = tighter core
+void main() {
+    float d = length(vUV);
+    if (d > 1.0) discard;
+    float intensity = exp(-uFalloff * d * d);
+    fragColor = vec4(uColor * intensity, intensity);
+}

shaders/ppi_targets.vert

@@ -0,0 +1,8 @@
+#version 330 core
+layout(location = 0) in vec2 aPos;
+layout(location = 1) in vec2 aUV;
+out vec2 vUV;
+void main() {
+    gl_Position = vec4(aPos, 0.0, 1.0);
+    vUV = aUV;
+}