From aca8d1ab4d7fce3dd0dce4fce1fb390984357612 Mon Sep 17 00:00:00 2001
From: emil28092005 <emil28092005@users.noreply.github.com>
Date: Thu, 18 Jun 2026 12:47:20 +0300
Subject: [PATCH] fix: correct matrix order (proj*view) + Z depth range for
 Vulkan
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- VP matrix order: proj*view (GLSL column-vector convention)
- Z correction in vertex shader: gl_Position.z = (z+w)*0.5 (OpenGL [-1,1] → Vulkan [0,1])
- Depth test temporarily disabled for debugging
---
 .../Shaders/triangle.vert                     |   1 +
 .../Shaders/triangle.vert.spv                 | Bin 1880 -> 2100 bytes
 src/Engine.Graphics.Vulkan/VulkanPipeline.cs  |   4 ++--
 src/Engine.Graphics.Vulkan/VulkanRenderer.cs  |   4 ++--
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
index 9b81756..56154c8 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
@@ -17,6 +17,7 @@ layout(row_major, push_constant) uniform PC {
 
 void main() {
     gl_Position = vp * pc.model * vec4(inPosition, 1.0);
+    gl_Position.z = (gl_Position.z + gl_Position.w) * 0.5;
     fragColor = inColor;
     fragNormal = mat3(pc.model) * inNormal;
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv
index b9f3c50d5f35dfe6c62faf446604e4d07c99808d..2c16878cb7dddf4544df23f17093c38aa3ad3c30 100644
GIT binary patch
delta 693
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delta 477
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diff --git a/src/Engine.Graphics.Vulkan/VulkanPipeline.cs b/src/Engine.Graphics.Vulkan/VulkanPipeline.cs
index c4b7544..45bf2ba 100644
--- a/src/Engine.Graphics.Vulkan/VulkanPipeline.cs
+++ b/src/Engine.Graphics.Vulkan/VulkanPipeline.cs
@@ -118,8 +118,8 @@ internal sealed unsafe class VulkanPipeline : IDisposable
             var depthStencilState = new VkPipelineDepthStencilStateCreateInfo
             {
                 sType = VkStructureType.PipelineDepthStencilStateCreateInfo,
-                depthTestEnable = VkBool32.True,
-                depthWriteEnable = VkBool32.True,
+                depthTestEnable = VkBool32.False,
+                depthWriteEnable = VkBool32.False,
                 depthCompareOp = VkCompareOp.Less,
                 depthBoundsTestEnable = VkBool32.False,
                 stencilTestEnable = VkBool32.False,
diff --git a/src/Engine.Graphics.Vulkan/VulkanRenderer.cs b/src/Engine.Graphics.Vulkan/VulkanRenderer.cs
index f77e23d..8b82534 100644
--- a/src/Engine.Graphics.Vulkan/VulkanRenderer.cs
+++ b/src/Engine.Graphics.Vulkan/VulkanRenderer.cs
@@ -273,8 +273,8 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
     {
         var aspect = (float)_swapchain.Extent.Width / (float)_swapchain.Extent.Height;
         var proj = Matrix4x4.CreatePerspectiveFieldOfView(MathF.PI / 4f, aspect, 0.1f, 100f);
-        var view = Matrix4x4.CreateLookAt(new Vector3(0, 0, -3), Vector3.Zero, Vector3.UnitY);
-        return view * proj;
+        var view = Matrix4x4.CreateLookAt(new Vector3(0, 0, 3), Vector3.Zero, Vector3.UnitY);
+        return proj * view;
     }
 
     private static void TransitionImageLayout(VkCommandBuffer cmd, VkImage image,