commit 1c49f79dd58f44e2192cf9137cfbe8109c34953b
author daniel@transgaming.com <daniel@transgaming.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> Thu May 31 01:14:02 2012 +0000
committer daniel@transgaming.com <daniel@transgaming.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> Thu May 31 01:14:02 2012 +0000
tree 4fde4902662cdb06469de35f918aff38f82cb8a4
parent d2cccf7a9a560a71d67de8b55425d498bc2d0a7a

Detect depth texture support using INTZ and NULL textures

Trac #20875
Signed-off-by: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1103 736b8ea6-26fd-11df-bfd4-992fa37f6226

src/libEGL/Display.cpp

diff --git a/src/libEGL/Display.cpp b/src/libEGL/Display.cpp
index 6a5cfd3..28c0935 100644
--- a/src/libEGL/Display.cpp
+++ b/src/libEGL/Display.cpp
@@ -992,6 +992,22 @@
     return SUCCEEDED(mD3d9->CheckDeviceFormat(mAdapter, mDeviceType, currentDisplayMode.Format, 0, D3DRTYPE_TEXTURE, D3DFMT_DXT5));
 }
 
+// we use INTZ for depth textures in Direct3D9
+// we also want NULL texture support to ensure the we can make depth-only FBOs
+// see http://aras-p.info/texts/D3D9GPUHacks.html
+bool Display::getDepthTextureSupport() const
+{
+    D3DDISPLAYMODE currentDisplayMode;
+    mD3d9->GetAdapterDisplayMode(mAdapter, &currentDisplayMode);
+
+    bool intz = SUCCEEDED(mD3d9->CheckDeviceFormat(mAdapter, mDeviceType, currentDisplayMode.Format,
+                                                   D3DUSAGE_DEPTHSTENCIL, D3DRTYPE_TEXTURE, D3DFMT_INTZ));
+    bool null = SUCCEEDED(mD3d9->CheckDeviceFormat(mAdapter, mDeviceType, currentDisplayMode.Format,
+                                                   D3DUSAGE_RENDERTARGET, D3DRTYPE_SURFACE, D3DFMT_NULL));
+
+    return intz && null;
+}
+
 bool Display::getFloat32TextureSupport(bool *filtering, bool *renderable)
 {
     D3DDISPLAYMODE currentDisplayMode;