From 5bc3cd8d8cf73438ec0265bdf9cc9a6a19356f05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Leclercq?= <lynix680@gmail.com>
Date: Thu, 3 Jun 2021 17:15:12 +0200
Subject: [PATCH] OpenGLRenderer: Add GL_EXT_texture_compression_s3tc check for
 DXT pixel formats

---
 include/Nazara/OpenGLRenderer/Wrapper/Context.hpp | 1 +
 src/Nazara/OpenGLRenderer/OpenGLDevice.cpp        | 5 +++++
 src/Nazara/OpenGLRenderer/Wrapper/Context.cpp     | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/include/Nazara/OpenGLRenderer/Wrapper/Context.hpp b/include/Nazara/OpenGLRenderer/Wrapper/Context.hpp
index bbaa38cf9..f76f0715c 100644
--- a/include/Nazara/OpenGLRenderer/Wrapper/Context.hpp
+++ b/include/Nazara/OpenGLRenderer/Wrapper/Context.hpp
@@ -50,6 +50,7 @@ namespace Nz::GL
 	{
 		SpirV,
 		TextureFilterAnisotropic,
+		TextureCompressionS3tc,
 
 		Max = TextureFilterAnisotropic
 	};
diff --git a/src/Nazara/OpenGLRenderer/OpenGLDevice.cpp b/src/Nazara/OpenGLRenderer/OpenGLDevice.cpp
index 08e4c4f56..61e072e38 100644
--- a/src/Nazara/OpenGLRenderer/OpenGLDevice.cpp
+++ b/src/Nazara/OpenGLRenderer/OpenGLDevice.cpp
@@ -191,7 +191,12 @@ namespace Nz
 			case PixelFormat::DXT1:
 			case PixelFormat::DXT3:
 			case PixelFormat::DXT5:
+			{
+				if (!m_referenceContext->IsExtensionSupported(GL::Extension::TextureCompressionS3tc))
+					return false;
+
 				return usage == TextureUsage::InputAttachment || usage == TextureUsage::ShaderSampling || usage == TextureUsage::TransferDestination || usage == TextureUsage::TransferSource;
+			}
 
 			case PixelFormat::Depth16:
 			case PixelFormat::Depth16Stencil8:
diff --git a/src/Nazara/OpenGLRenderer/Wrapper/Context.cpp b/src/Nazara/OpenGLRenderer/Wrapper/Context.cpp
index e23a3c7a9..e719249e1 100644
--- a/src/Nazara/OpenGLRenderer/Wrapper/Context.cpp
+++ b/src/Nazara/OpenGLRenderer/Wrapper/Context.cpp
@@ -281,6 +281,9 @@ namespace Nz::GL
 
 		m_extensionStatus.fill(ExtensionStatus::NotSupported);
 
+		if (m_supportedExtensions.count("GL_EXT_texture_compression_s3tc"))
+			m_extensionStatus[UnderlyingCast(Extension::TextureCompressionS3tc)] = ExtensionStatus::EXT;
+
 		// TextureFilterAnisotropic
 		if (m_supportedExtensions.count("GL_ARB_texture_filter_anisotropic"))
 			m_extensionStatus[UnderlyingCast(Extension::TextureFilterAnisotropic)] = ExtensionStatus::ARB;