8 files changed, 22 insertions, 3 deletions
diff --git a/src/gui/opengl/qopenglextensions_p.h b/src/gui/opengl/qopenglextensions_p.h
index 137f1e831f..0d58b5f301 100644
--- a/src/gui/opengl/qopenglextensions_p.h
+++ b/src/gui/opengl/qopenglextensions_p.h
@@ -92,6 +92,7 @@ public:
         DiscardFramebuffer      = 0x00400000,
         Sized16Formats          = 0x00800000,
         TextureSwizzle          = 0x01000000,
+        StandardDerivatives     = 0x02000000,
     };
     Q_DECLARE_FLAGS(OpenGLExtensions, OpenGLExtension)
 
diff --git a/src/gui/opengl/qopenglfunctions.cpp b/src/gui/opengl/qopenglfunctions.cpp
index a95f064ac5..7c17d3798b 100644
--- a/src/gui/opengl/qopenglfunctions.cpp
+++ b/src/gui/opengl/qopenglfunctions.cpp
@@ -376,6 +376,8 @@ static int qt_gl_resolve_extensions()
         extensions |= QOpenGLExtensions::PixelBufferObject;
     if (extensionMatcher.match("GL_ARB_texture_swizzle") || extensionMatcher.match("GL_EXT_texture_swizzle"))
         extensions |= QOpenGLExtensions::TextureSwizzle;
+    if (extensionMatcher.match("GL_OES_standard_derivatives"))
+        extensions |= QOpenGLExtensions::StandardDerivatives;
 
     if (ctx->isOpenGLES()) {
         if (format.majorVersion() >= 2)
@@ -388,7 +390,8 @@ static int qt_gl_resolve_extensions()
                 | QOpenGLExtensions::MapBufferRange
                 | QOpenGLExtensions::FramebufferBlit
                 | QOpenGLExtensions::FramebufferMultisample
-                | QOpenGLExtensions::Sized8Formats;
+                | QOpenGLExtensions::Sized8Formats
+                | QOpenGLExtensions::StandardDerivatives;
 #ifndef Q_OS_WASM
             // WebGL 2.0 specification explicitly does not support texture swizzles
             // https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.19
@@ -445,6 +448,9 @@ static int qt_gl_resolve_extensions()
         if (format.version() >= qMakePair(1, 4) || extensionMatcher.match("GL_SGIS_generate_mipmap"))
             extensions |= QOpenGLExtensions::GenerateMipmap;
 
+        if (format.majorVersion() >= 2)
+            extensions |= QOpenGLExtensions::StandardDerivatives;
+
         if (format.majorVersion() >= 3 || extensionMatcher.match("GL_ARB_framebuffer_object")) {
             extensions |= QOpenGLExtensions::FramebufferMultisample
                 | QOpenGLExtensions::FramebufferBlit
diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index bd476c3927..9f94fea1dc 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -1456,7 +1456,8 @@ public:
         ReadBackNonBaseMipLevel,
         TexelFetch,
         RenderToNonBaseMipLevel,
-        UIntAttributes
+        UIntAttributes,
+        ScreenSpaceDerivatives
     };
 
     enum BeginFrameFlag {
diff --git a/src/gui/rhi/qrhid3d11.cpp b/src/gui/rhi/qrhid3d11.cpp
index c284e17f46..710ebd62cc 100644
--- a/src/gui/rhi/qrhid3d11.cpp
+++ b/src/gui/rhi/qrhid3d11.cpp
@@ -479,6 +479,8 @@ bool QRhiD3D11::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::UIntAttributes:
         return true;
+    case QRhi::ScreenSpaceDerivatives:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;
diff --git a/src/gui/rhi/qrhigles2.cpp b/src/gui/rhi/qrhigles2.cpp
index ebe66f302b..632a5154e7 100644
--- a/src/gui/rhi/qrhigles2.cpp
+++ b/src/gui/rhi/qrhigles2.cpp
@@ -522,6 +522,7 @@ bool QRhiGles2::create(QRhi::Flags flags)
 
     caps.texelFetch = caps.ctxMajor >= 3; // 3.0 or ES 3.0
     caps.uintAttributes = caps.ctxMajor >= 3; // 3.0 or ES 3.0
+    caps.screenSpaceDerivatives = f->hasOpenGLExtension(QOpenGLExtensions::StandardDerivatives);
 
     if (!caps.gles) {
         f->glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
@@ -872,6 +873,8 @@ bool QRhiGles2::isFeatureSupported(QRhi::Feature feature) const
         return caps.nonBaseLevelFramebufferTexture;
     case QRhi::UIntAttributes:
         return caps.uintAttributes;
+    case QRhi::ScreenSpaceDerivatives:
+        return caps.screenSpaceDerivatives;
     default:
         Q_UNREACHABLE();
         return false;
diff --git a/src/gui/rhi/qrhigles2_p_p.h b/src/gui/rhi/qrhigles2_p_p.h
index 2c393da3b4..03ed81dfb2 100644
--- a/src/gui/rhi/qrhigles2_p_p.h
+++ b/src/gui/rhi/qrhigles2_p_p.h
@@ -869,7 +869,8 @@ public:
               properMapBuffer(false),
               nonBaseLevelFramebufferTexture(false),
               texelFetch(false),
-              uintAttributes(true)
+              uintAttributes(true),
+              screenSpaceDerivatives(false)
         { }
         int ctxMajor;
         int ctxMinor;
@@ -904,6 +905,7 @@ public:
         uint nonBaseLevelFramebufferTexture : 1;
         uint texelFetch : 1;
         uint uintAttributes : 1;
+        uint screenSpaceDerivatives : 1;
     } caps;
     QGles2SwapChain *currentSwapChain = nullptr;
     QVector<GLint> supportedCompressedFormats;
diff --git a/src/gui/rhi/qrhimetal.mm b/src/gui/rhi/qrhimetal.mm
index b249dc55cc..0c42eaa3e9 100644
--- a/src/gui/rhi/qrhimetal.mm
+++ b/src/gui/rhi/qrhimetal.mm
@@ -568,6 +568,8 @@ bool QRhiMetal::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::UIntAttributes:
         return true;
+    case QRhi::ScreenSpaceDerivatives:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;
diff --git a/src/gui/rhi/qrhivulkan.cpp b/src/gui/rhi/qrhivulkan.cpp
index 59898d3839..fdc80e1e80 100644
--- a/src/gui/rhi/qrhivulkan.cpp
+++ b/src/gui/rhi/qrhivulkan.cpp
@@ -4050,6 +4050,8 @@ bool QRhiVulkan::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::UIntAttributes:
         return true;
+    case QRhi::ScreenSpaceDerivatives:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;