rectangle

Rectangle Rendering Sample

Overview

This sample demonstrates basic quad rendering using vertex and fragment shaders, building upon the concepts introduced in the solid_color sample. It showcases the implementation of a simple geometry pipeline and the use of G-Buffers for off-screen rendering.

Implementation Details

Initialization (onAttach)

When RectangleSample is added to nvvk::Application, the onAttach(app) method is invoked, performing the following tasks:

1. Instantiates a memory allocator for efficient resource management.
2. Initializes a debug utility for resource naming and visualization in Nsight Graphics.
3. Creates the rendering pipeline via createPipeline(), defining the rendering configuration.
4. Generates vertex and index buffers defining the rectangle geometry in createGeometryBuffers().

Resizing (onResize)

The onResize(w,h) method manages G-Buffer creation:

• Color format: VK_FORMAT_R8G8B8A8_UNORM
• Depth format: Dynamically queried to optimize for the current physical device

Rendering

G-Buffer Rendering

• The rectangle is rendered into the G-Buffer, not directly to the swapchain.
• G-Buffer contents are displayed using ImGui in onUIRender().

Main Rendering Pass (onRender)

Utilizes Vulkan Dynamic Rendering:

1. Attaches G-Buffer color and depth targets.
2. Executes primitive rendering.

Technical Specifications

• Shader Types: Vertex and Fragment
• Geometry: Single quad (rectangle)
• Rendering Technique: Off-screen G-Buffer rendering with ImGui display
• Vulkan Features: Dynamic Rendering