+ void draw_mixer_buffer(safe_ptr<device_buffer>& draw_buffer, \r
+ std::shared_ptr<device_buffer>&& source_buffer, \r
+ blend_mode::type blend_mode = blend_mode::normal)\r
+ {\r
+ if(!source_buffer)\r
+ return;\r
+\r
+ draw_params draw_params;\r
+ draw_params.pix_desc.pix_fmt = pixel_format::bgra;\r
+ draw_params.pix_desc.planes = list_of(pixel_format_desc::plane(source_buffer->width(), source_buffer->height(), 4));\r
+ draw_params.textures = list_of(source_buffer);\r
+ draw_params.transform = frame_transform();\r
+ draw_params.blend_mode = blend_mode;\r
+ draw_params.background = draw_buffer;\r
+\r
+ kernel_.draw(ogl_, std::move(draw_params));\r
+ }\r
+ \r
+ safe_ptr<device_buffer> create_mixer_buffer(size_t stride)\r
+ {\r
+ auto buffer = ogl_.create_device_buffer(format_desc_.width, format_desc_.height, stride);\r
+ ogl_.clear(*buffer);\r
+ return buffer;\r
+ }\r
+};\r