64 lines
2.0 KiB
Markdown
64 lines
2.0 KiB
Markdown
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# 2D Graphics (`gfx2d`)
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## Table of Contents
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<!-- TOC -->
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* [Home](./CONTENTS.md#planning-documentation-for-fennec)
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* [2D Graphics (`gfx2d`)](#2d-graphics-gfx2d)
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* [Table of Contents](#table-of-contents)
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* [Introduction](#introduction)
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* [Structures (`gfx2d`)](#structures-gfx2d)
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<!-- TOC -->
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## Introduction
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  This system handles the rendering of 2D meshes and textures.
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Links:
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- https://en.wikipedia.org/wiki/Quadtree
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- https://developer.nvidia.com/gpugems/gpugems3/part-iv-image-effects/chapter-25-rendering-vector-art-gpu
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### Structures (`gfx2d`)
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For the 2d rendering framework, Materials need to be rendered independently because we have
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no size constraints for images. This disallows us from using a meta-shader like in
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the 3d rendering framework.
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```c++
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struct Object
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{
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vec2 location, scale; // A matrix would be 36 bytes, this is instead 20 bytes
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float rotation;
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}
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```
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- BVH
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- Quadtree
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- Leaf Size and Tree Depth should be calculated by the scene, constraints are as follows:
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- Min Object Size
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- Max Object Size
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- Scene Center
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- Scene Edge
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- Insertions and Updates are done on the CPU
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- Nodes
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- Start Index 32-bits
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- Object Count 32-bits
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- Objects
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- Buffer of Object IDs grouped by Octree Node
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- Culling
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- Starting at each Octree Leaf, traverse upwards.
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- Insert Visible Leaf IDs
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- Track using atomic buffer
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- Generate the Command Buffer for Culled Meshes from the Visible Leaf Buffer
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- Count Materials
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- Count Meshes per Material
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- Generate the Culled Object Buffer by copying objects from the Object Buffer
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- Adjust Buffer Size using the counts
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- Insert using another atomic buffer
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- Translucent objects will be sorted. We can cheat by using a z-index instead of a z-coordinate.
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This will allow us to sort objects as they are created. We can still bulk render each z-index,
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with meshes and objects being grouped by material. |