From 418765d59540537dc059f6ae7e7f5f0feb60a6d2 Mon Sep 17 00:00:00 2001
From: SeanOMik <seanomik@gmail.com>
Date: Sat, 30 Nov 2024 12:05:34 -0500
Subject: [PATCH] render: use depth buffer

---
 .../src/render/graph/passes/sprite.rs         | 27 +++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/crates/lyra-game/src/render/graph/passes/sprite.rs b/crates/lyra-game/src/render/graph/passes/sprite.rs
index 743cae4..141d90b 100644
--- a/crates/lyra-game/src/render/graph/passes/sprite.rs
+++ b/crates/lyra-game/src/render/graph/passes/sprite.rs
@@ -15,9 +15,7 @@ use wgpu::util::DeviceExt;
 
 use crate::{
     render::{
-        graph::{Node, NodeDesc, NodeType, SlotAttribute},
-        resource::{FragmentState, RenderPipeline, RenderPipelineDescriptor, VertexState},
-        vertex::Vertex2D,
+        graph::{Node, NodeDesc, NodeType, SlotAttribute}, resource::{FragmentState, RenderPipeline, RenderPipelineDescriptor, VertexState}, texture::RenderTexture, vertex::Vertex2D
     },
     sprite::{AtlasSprite, Sprite},
 };
@@ -294,7 +292,13 @@ impl Node for SpritePass {
                             write_mask: wgpu::ColorWrites::ALL,
                         })],
                     }),
-                    depth_stencil: None,
+                    depth_stencil: Some(wgpu::DepthStencilState {
+                        format: RenderTexture::DEPTH_FORMAT,
+                        depth_write_enabled: true,
+                        depth_compare: wgpu::CompareFunction::Less,
+                        stencil: wgpu::StencilState::default(), // TODO: stencil buffer
+                        bias: wgpu::DepthBiasState::default(),
+                    }),
                     primitive: wgpu::PrimitiveState {
                         cull_mode: Some(wgpu::Face::Back),
                         ..Default::default()
@@ -421,6 +425,12 @@ impl Node for SpritePass {
         let vt = graph.view_target();
         let view = vt.render_view();
 
+        let depth_view = graph
+            .slot_value(BasePassSlots::DepthTextureView)
+            .unwrap()
+            .as_texture_view()
+            .expect("BasePassSlots::DepthTextureView was not a TextureView slot");
+
         let camera_bg = graph.bind_group(BasePassSlots::Camera);
 
         {
@@ -440,7 +450,14 @@ impl Node for SpritePass {
                         store: wgpu::StoreOp::Store,
                     },
                 })],
-                depth_stencil_attachment: None,
+                depth_stencil_attachment: Some(wgpu::RenderPassDepthStencilAttachment {
+                    view: depth_view,
+                    depth_ops: Some(wgpu::Operations {
+                        load: wgpu::LoadOp::Clear(1.0),
+                        store: wgpu::StoreOp::Store,
+                    }),
+                    stencil_ops: None,
+                }),
                 timestamp_writes: None,
                 occlusion_query_set: None,
             });