Project 4: Wanru Zhao

CMakeLists.txt

@@ -41,6 +41,7 @@ set(CORELIBS
 # Enable C++11 for host code
 set(CMAKE_CXX_STANDARD 11)
 
+
 # Set up different build configurations
 set(CMAKE_CONFIGURATION_TYPES Debug;RelWithDebInfo;Release
     CACHE STRING "Set configuration types" FORCE)

README.md

@@ -5,16 +5,78 @@ CUDA Rasterizer
 
 **University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 4**
 
-* (TODO) YOUR NAME HERE
-* Tested on: (TODO) Windows 22, i7-2222 @ 2.22GHz 22GB, GTX 222 222MB (Moore 2222 Lab)
+* Wanru Zhao
+  * [LinkedIn](www.linkedin.com/in/wanru-zhao).
+* Tested on: Windows 10, Intel(R) Core(TM) i7-8750H [email protected], GTX 1070 with Max-Q Design(Personal Laptop)
 
-### (TODO: Your README)
+### Final
+<p align="middle">
+  <img src="imgs/duck2.gif" width="400" />
+</p>
 
-*DO NOT* leave the README to the last minute! It is a crucial part of the
-project, and we will not be able to grade you without a good README.
+### Features
+#### Basic Features
+- Vertex shading
+- Primitive assembly with different primitive modes
+- Rasterization
+- A depth buffer for storing and depth testing fragments
+- Fragment-to-depth-buffer writing (with atomics for race avoidance)
+- Fragment shading (lambert and blinn-phong)
+#### Extra Features
+- Backface culling
+- Correct color interpolation between points on a primitive
+- UV texture mapping with bilinear texture filtering and perspective correct texture coordinates
+- Support for rasterizing additional primitives: lines and points
 
+### Results
+#### Base pipeline
+Albedo | Depth | Normal
+:--:|:--:|:--:
+![](imgs/duck.2018-10-16_19-55-39z.png) | ![](imgs/duck.2018-10-16_19-51-15z.png) | ![](imgs/duck.2018-10-16_19-53-56z.png)
+Albedo | Lambert | Blinn-phong
+![](imgs/duck.2018-10-16_19-55-39z.png) | ![](imgs/duck.2018-10-16_19-57-41z.png) | ![](imgs/duck.2018-10-16_19-58-45z.png)
+
+#### Correct color interpolation
+Without color correction | With color correction
+:--:|:--:
+![](imgs/triangle.2018-10-16_21-18-00z.png) | ![](imgs/triangle.2018-10-16_21-17-39z.png) 
+
+#### UV texture mapping with bilinear texture filtering and perspective correct texture coordinates
+Original | Perspective correct texture coordinates | Bilinear filtering + Perspective correct texture coordinates
+:--:|:--:|:--:
+![](imgs/checkerboard.2018-10-16_20-20-45z.png) | ![](imgs/checkerboard.2018-10-16_20-21-27z.png) | ![](imgs/checkerboard.2018-10-16_20-22-12z.png)
+
+#### Additional primitives
+Triangle | Points | Lines
+:--:|:--:|:--:
+![](imgs/cow.2018-10-16_20-04-43z.png) | ![](imgs/cow.2018-10-16_20-09-45z.png) | ![](imgs/cow.2018-10-16_20-12-06z.png)
+
+#### Backface culling
+Original | Lines | Lines with backface culling
+:--:|:--:|:--:
+![](imgs/CesiumMilkTruck.2018-10-16_20-00-56z.png) | ![](imgs/CesiumMilkTruck.2018-10-16_20-18-27z.png) | ![](imgs/CesiumMilkTruck.2018-10-16_20-19-08z.png)
+
+### Performance Analysis
+#### Breakdown of time spent in each pipeline stage
+<p align="middle">
+  <img src="imgs/Breakdown.png" width="600" />
+</p>
+
+Above chart shows that the majority of time spent in rendering pipeline is the stage "Rasterize", where primitives are scaned, overlapped fragments are calculated/stored, and depth test is done to decide the final fragment to be rendered. To avoid race condition, Atomic is used, which takes a considerate amount of time. Generally, more vertices/primitives a model has, more time will be taken for rasterization. (Cow vs Duck) Also the time spent in Rasterize is also related to the size of primitives of a model, since scanline does the calculation for every pixel in AABB of a primitive. (CesiumMilkTruck vs Duck).
+
+For vertex shader and vertex assembly stages, the time spent is simply related to the number of vertices in a model. However, those two stages are very quick and have no significant influence to total process time.
+
+Fragment shader is related to texturing and coloring, and there are only slight different among all models.
+
+#### Performance of backface culling
+<p align="middle">
+  <img src="imgs/Performance.png" width="600" />
+</p>
+
+Since backface culling ignores all backfaces, it benefits "Rasterize" stage the most and has little effect on other stages.
 
 ### Credits
 
 * [tinygltfloader](https://github.com/syoyo/tinygltfloader) by [@soyoyo](https://github.com/syoyo)
 * [glTF Sample Models](https://github.com/KhronosGroup/glTF/blob/master/sampleModels/README.md)
+* Image save function transplanted from Project 3