From 05532756cfad020f98c9f85b09bc4f3f1faf67b3 Mon Sep 17 00:00:00 2001
From: Florian RICHER <florian.richer@protonmail.com>
Date: Thu, 29 May 2025 16:08:41 +0200
Subject: [PATCH] docs: Add opengl/vulkan diff

---
 README.md                                     |   6 +-
 docs/OPENGL_VULKAN_DIFF.md                    |  11 +
 docs/images/coord_sys.png                     | Bin 0 -> 24096 bytes
 docs/images/normalized_device_coordinates.svg | 219 ++++++++++++++++++
 4 files changed, 235 insertions(+), 1 deletion(-)
 create mode 100644 docs/OPENGL_VULKAN_DIFF.md
 create mode 100644 docs/images/coord_sys.png
 create mode 100644 docs/images/normalized_device_coordinates.svg

diff --git a/README.md b/README.md
index 6e4bad1..c271fd8 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,16 @@
 # Project
 
-Run renderdoc on wayland:
+## Notes
+
+1. Run renderdoc on wayland:
 
 ```console
 WAYLAND_DISPLAY= QT_QPA_PLATFORM=xcb qrenderdoc
 ```
 > Not supported yet https://github.com/baldurk/renderdoc/issues/853
 
+2. [Difference Between OpenGL and Vulkan](./docs/OPENGL_VULKAN_DIFF.md)
+
 ## Usefull links
 
 - https://vulkan-tutorial.com/fr/Introduction
diff --git a/docs/OPENGL_VULKAN_DIFF.md b/docs/OPENGL_VULKAN_DIFF.md
new file mode 100644
index 0000000..93d0855
--- /dev/null
+++ b/docs/OPENGL_VULKAN_DIFF.md
@@ -0,0 +1,11 @@
+# Difference between Vulkan and OpenGL
+
+Viewport:
+
+- Y axis is flipped like D3D
+- Clipped Z axis is not [-1; 1] but [0; 1]
+
+![normalized viewport coordinates](./images/normalized_device_coordinates.svg)
+![coord_sys](./images/coord_sys.png)
+
+See: [Vulkan Tutorial (Vertex step)](https://vulkan-tutorial.com/Drawing_a_triangle/Graphics_pipeline_basics/Shader_modules) and [VK_KHR_maintenance1 (Allow negative height)](https://registry.khronos.org/vulkan/specs/latest/man/html/VK_KHR_maintenance1.html#_description)
diff --git a/docs/images/coord_sys.png b/docs/images/coord_sys.png
new file mode 100644
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diff --git a/docs/images/normalized_device_coordinates.svg b/docs/images/normalized_device_coordinates.svg
new file mode 100644
index 0000000..970c9f4
--- /dev/null
+++ b/docs/images/normalized_device_coordinates.svg
@@ -0,0 +1,219 @@
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