| ctx | The ScriptableRenderContext object currently being rendered. |
| w | The width of the RenderPass surfaces in pixels. |
| h | The height of the RenderPass surfaces in pixels. |
| samples | MSAA sample count; set to 1 to disable antialiasing. |
| colors | Array of color attachments to use within this RenderPass. |
| depth | The attachment to be used as the depth/stencil buffer for this RenderPass, or null to disable depth/stencil. |
Create a RenderPass and start it within the ScriptableRenderContext.