Add Chromium-only Blender WebEngine parity work

blender-5.2.0/doc/python_api/examples/gpu.2.py

@@ -0,0 +1,50 @@
+"""
+Triangle with Custom Shader
+---------------------------
+"""
+import bpy
+import gpu
+from gpu_extras.batch import batch_for_shader
+
+
+vert_out = gpu.types.GPUStageInterfaceInfo("my_interface")
+vert_out.smooth('VEC3', "pos")
+
+shader_info = gpu.types.GPUShaderCreateInfo()
+shader_info.push_constant('MAT4', "viewProjectionMatrix")
+shader_info.push_constant('FLOAT', "brightness")
+shader_info.vertex_in(0, 'VEC3', "position")
+shader_info.vertex_out(vert_out)
+shader_info.fragment_out(0, 'VEC4', "FragColor")
+
+shader_info.vertex_source(
+    "void main()"
+    "{"
+    "  pos = position;"
+    "  gl_Position = viewProjectionMatrix * vec4(position, 1.0f);"
+    "}"
+)
+
+shader_info.fragment_source(
+    "void main()"
+    "{"
+    "  FragColor = vec4(pos * brightness, 1.0);"
+    "}"
+)
+
+shader = gpu.shader.create_from_info(shader_info)
+del vert_out
+del shader_info
+
+coords = [(1, 1, 1), (2, 0, 0), (-2, -1, 3)]
+batch = batch_for_shader(shader, 'TRIS', {"position": coords})
+
+
+def draw():
+    matrix = bpy.context.region_data.perspective_matrix
+    shader.uniform_float("viewProjectionMatrix", matrix)
+    shader.uniform_float("brightness", 0.5)
+    batch.draw(shader)
+
+
+bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')