Big changes

testbed/shaders/smoke_test.comp

@@ -0,0 +1,12 @@
+#version 450
+
+layout(local_size_x = 64) in;
+
+layout(std430, binding = 0) buffer Data {
+  float values[];
+};
+
+void main() {
+  uint idx = gl_GlobalInvocationID.x;
+  values[idx] = values[idx] * 2.0;
+}