API Docs: gpu api introduction + examples

doc/python_api/examples/gpu.4.py

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+"""
+Wireframe Cube using Index Buffer
+---------------------------------
+"""
+import bpy
+import gpu
+from gpu_extras.batch import batch_for_shader
+
+coords = (
+    (-1, -1, -1), ( 1, -1, -1),
+    (-1,  1, -1), ( 1,  1, -1),
+    (-1, -1,  1), ( 1, -1,  1),
+    (-1,  1,  1), ( 1,  1,  1))
+
+indices = (
+    (0, 1), (0, 2), (1, 3), (2, 3),
+    (4, 5), (4, 6), (5, 7), (6, 7),
+    (0, 4), (1, 5), (2, 6), (3, 7))
+
+shader = gpu.shader.from_builtin('3D_UNIFORM_COLOR')
+batch = batch_for_shader(shader, 'LINES', {"pos" : coords}, indices=indices)
+
+def draw():
+    shader.bind()
+    shader.uniform_float("color", (1, 0, 0, 1))
+    batch.draw(shader)
+
+bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')