From 44991f355cc9938d02dc500062a20a8a61ac2cfa Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Sat, 6 Mar 2021 14:17:53 +0100
Subject: [PATCH] app/internal/d3d11: include depth buffer in current
 framebuffer query

Fixes rendering on Windows. Thanks to Egon Elbre for noticing.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 app/internal/d3d11/backend_windows.go |  9 ++++++---
 app/internal/d3d11/d3d11_windows.go   | 11 +++++++----
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/app/internal/d3d11/backend_windows.go b/app/internal/d3d11/backend_windows.go
index 2753b673..c0d820b8 100644
--- a/app/internal/d3d11/backend_windows.go
+++ b/app/internal/d3d11/backend_windows.go
@@ -279,12 +279,15 @@ func NewBackend(d *Device) (*Backend, error) {
 }
 
 func (b *Backend) BeginFrame() backend.Framebuffer {
-	renderTarget := b.dev.ctx.OMGetRenderTargets()
+	renderTarget, depthView := b.dev.ctx.OMGetRenderTargets()
+	// Assume someone else is holding on to the render targets.
 	if renderTarget != nil {
-		// Assume someone else is holding on to it.
 		_IUnknownRelease(unsafe.Pointer(renderTarget), renderTarget.vtbl.Release)
 	}
-	return &Framebuffer{dev: b.dev, renderTarget: renderTarget, foreign: true}
+	if depthView != nil {
+		_IUnknownRelease(unsafe.Pointer(depthView), depthView.vtbl.Release)
+	}
+	return &Framebuffer{dev: b.dev, renderTarget: renderTarget, depthView: depthView, foreign: true}
 }
 
 func (b *Backend) EndFrame() {
diff --git a/app/internal/d3d11/d3d11_windows.go b/app/internal/d3d11/d3d11_windows.go
index 9226f219..198296c0 100644
--- a/app/internal/d3d11/d3d11_windows.go
+++ b/app/internal/d3d11/d3d11_windows.go
@@ -1197,18 +1197,21 @@ func (c *_ID3D11DeviceContext) IASetPrimitiveTopology(mode uint32) {
 	)
 }
 
-func (c *_ID3D11DeviceContext) OMGetRenderTargets() *_ID3D11RenderTargetView {
-	var target *_ID3D11RenderTargetView
+func (c *_ID3D11DeviceContext) OMGetRenderTargets() (*_ID3D11RenderTargetView, *_ID3D11DepthStencilView) {
+	var (
+		target           *_ID3D11RenderTargetView
+		depthStencilView *_ID3D11DepthStencilView
+	)
 	syscall.Syscall6(
 		c.vtbl.OMGetRenderTargets,
 		4,
 		uintptr(unsafe.Pointer(c)),
 		1, // NumViews
 		uintptr(unsafe.Pointer(&target)),
-		0, // pDepthStencilView
+		uintptr(unsafe.Pointer(&depthStencilView)),
 		0, 0,
 	)
-	return target
+	return target, depthStencilView
 }
 
 func (c *_ID3D11DeviceContext) OMSetRenderTargets(target *_ID3D11RenderTargetView, depthStencil *_ID3D11DepthStencilView) {