This sample alternates between 2 rendering states using conditional rendering:
- 2 colorful cubes with a blue background
- 1 black cube with a pink background
Conditional rendering is enabled by requesting the VK_EXT_conditional_rendering device extension.
Conditional rendering is used to enable/disable draws, displatches and attachments clears.
Condition 1 is fulfilled if the buffer value is 1. Condition 2 is using VK_CONDITIONAL_RENDERING_INVERTED_BIT_EXT flag, so it will be the opposite of condition 1.
CommandBuffer for each frame: - Pipeline barriers - ConditionalBegin on condition 1 - Binding - Dispatch: updates buffer value for alpha channel to 1.0 to produce a colourful cube in the later draw. - Barriers - RenderPass - Binding - ConditionalBegin on condition 1 - Clear attachment to blue - Draw 2 cubes - ConditionalBegin on condition 2 - Clear attachment to pink - Draw a single cube