load shaders from files.

vis/shaders/one-color.fs.glsl

@@ -0,0 +1,12 @@
+#version 430
+
+layout(location=2) uniform vec3 c;
+
+in vec4 vpos;
+
+out vec4 color;
+
+void main() {
+    float d = smoothstep(-2, 2, vpos.z);
+    color = vec4(c * d, 1);
+}

vis/shaders/ortho.vs.glsl

@@ -0,0 +1,15 @@
+#version 430
+
+layout(location=0) uniform mat4 proj;
+layout(location=1) uniform mat4 view;
+
+layout(location=0) in vec4 pos;
+
+out vec4 vpos;
+
+void main() {
+    int i = gl_VertexID;
+    vpos = view * pos;
+    gl_Position = proj * vec4(vpos.xyz / (1), 1);
+    gl_PointSize = 5;
+}

vis/shaders/stereo.vs.glsl

@@ -0,0 +1,15 @@
+#version 430
+
+layout(location=0) uniform mat4 proj;
+layout(location=1) uniform mat4 view;
+
+layout(location=0) in vec4 pos;
+
+out vec4 vpos;
+
+void main() {
+    int i = gl_VertexID;
+    vpos = view * pos;
+     gl_Position = proj * vec4(vpos.xyz / (1 - vpos.w), 1);
+    gl_PointSize = 5;
+}

vis/shaders/w-axis-hue.fs.glsl

@@ -0,0 +1,11 @@
+#version 430
+
+in vec4 vpos;
+
+out vec4 color;
+
+void main() {
+    float d = smoothstep(-2, 2, vpos.z);
+    vec3 off = 1.04 * vec3(0, 2, 4) + 2 * vec3(vpos.w);
+    color = vec4(d * cos(off), 1);
+}