First implementation of SSBO, vertex pulling

shader/pull/window.vert

@@ -0,0 +1,34 @@
+#version 450 core
+struct PosCol {
+    vec4 pospos;
+    vec4 col;
+};
+layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+layout (std430, binding = 1) readonly buffer Pos { PosCol data[]; };
+out vec4 vCol;
+out vec4 vPos;
+int indices[6] = {0,1,2,2,3,0};
+vec4 iface[6] = 
+    { vec4 (-1,-1,0,1)
+    , vec4 (-1,1,0,1)
+    , vec4 (1,1,0,1)
+    , vec4 (1,1,0,1)
+    , vec4 (1,-1,0,1)
+    , vec4 (-1,-1,0,1)
+    };
+void main()
+{
+    //const struct PosCol pc = data[gl_VertexID / 6];
+    vec4 pp = data[gl_VertexID / 6].pospos;
+    vCol = data[gl_VertexID / 6].col;
+    //vCol = vec4(1,0.5,0,0.5);
+    int j = indices[gl_VertexID % 6];
+    float z = (j / 2 > 0 ? 5000 : 0);
+    //vec2 xy = (j % 2 > 0 ? pc.pospos.xy : pc.pospos.zw);
+    vec2 xy = (j % 2 > 0 ? pp.xy : pp.zw);
+    vPos = vec4( xy, z, 1);
+//    vPos = vec4( 0,0,0, 1);
+    //vCol = pc.col; 
+    gl_Position = theMat * vPos;
+    //gl_Position = iface[gl_VertexID % 6];
+}