Support for ARB_texture_filter_anisotropic.

doc/opengl-support.dox

@@ -265,7 +265,7 @@ GLSL 4.60                                   | done
 @extension{ARB,gl_spirv}                    | |
 @extension{ARB,polygon_offset_clamp}        | |
 @extension{ARB,spirv_extensions}            | |
-@extension{ARB,texture_filter_anisotropic}  | |
+@extension{ARB,texture_filter_anisotropic}  | done
 @extension{KHR,no_error}                    | done
 
 @subsection opengl-support-extensions ARB / Khronos OpenGL extensions

src/Magnum/AbstractTexture.cpp

@@ -1181,6 +1181,12 @@ void AbstractTexture::parameterIImplementationDSAEXT(GLenum parameter, const GLi
 
 void AbstractTexture::setMaxAnisotropyImplementationNoOp(GLfloat) {}
 
+#ifndef MAGNUM_TARGET_GLES
+void AbstractTexture::setMaxAnisotropyImplementationArb(GLfloat anisotropy) {
+    (this->*Context::current().state().texture->parameterfImplementation)(GL_TEXTURE_MAX_ANISOTROPY, anisotropy);
+}
+#endif
+
 void AbstractTexture::setMaxAnisotropyImplementationExt(GLfloat anisotropy) {
     (this->*Context::current().state().texture->parameterfImplementation)(GL_TEXTURE_MAX_ANISOTROPY_EXT, anisotropy);
 }

src/Magnum/AbstractTexture.h

@@ -561,6 +561,9 @@ class MAGNUM_EXPORT AbstractTexture: public AbstractObject {
         #endif
 
         void MAGNUM_LOCAL setMaxAnisotropyImplementationNoOp(GLfloat);
+        #ifndef MAGNUM_TARGET_GLES
+        void MAGNUM_LOCAL setMaxAnisotropyImplementationArb(GLfloat anisotropy);
+        #endif
         void MAGNUM_LOCAL setMaxAnisotropyImplementationExt(GLfloat anisotropy);
 
         #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)

src/Magnum/Context.cpp

@@ -626,6 +626,7 @@ bool Context::tryCreate() {
         Version::GL430,
         Version::GL440,
         Version::GL450,
+        Version::GL460,
         #else
         Version::GLES200,
         Version::GLES300,

src/Magnum/Implementation/TextureState.cpp

@@ -401,6 +401,13 @@ TextureState::TextureState(Context& context, std::vector<std::string>& extension
     #endif
 
     /* Anisotropic filter implementation */
+    #ifndef MAGNUM_TARGET_GLES
+    if(context.isExtensionSupported<Extensions::GL::EXT::texture_filter_anisotropic>()) {
+        extensions.emplace_back(Extensions::GL::ARB::texture_filter_anisotropic::string());
+
+        setMaxAnisotropyImplementation = &AbstractTexture::setMaxAnisotropyImplementationArb;
+    } else
+    #endif
     if(context.isExtensionSupported<Extensions::GL::EXT::texture_filter_anisotropic>()) {
         extensions.emplace_back(Extensions::GL::EXT::texture_filter_anisotropic::string());
 

src/Magnum/Platform/magnum-info.cpp

@@ -694,6 +694,13 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     }
     #endif
 
+    #ifndef MAGNUM_TARGET_GLES
+    if(c.isExtensionSupported<Extensions::GL::ARB::texture_filter_anisotropic>()) {
+        _h(ARB::texture_filter_anisotropic)
+
+        _l(Sampler::maxMaxAnisotropy())
+    } else
+    #endif
     if(c.isExtensionSupported<Extensions::GL::EXT::texture_filter_anisotropic>()) {
         _h(EXT::texture_filter_anisotropic)
 

src/Magnum/Sampler.cpp

@@ -48,14 +48,18 @@ static_assert((filter_or(Nearest, Base) == GL_NEAREST) &&
 #undef filter_or
 
 Float Sampler::maxMaxAnisotropy() {
-    if(!Context::current().isExtensionSupported<Extensions::GL::EXT::texture_filter_anisotropic>())
-        return 0.0f;
-
     GLfloat& value = Context::current().state().texture->maxMaxAnisotropy;
 
     /* Get the value, if not already cached */
-    if(value == 0.0f)
-        glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &value);
+    if(value == 0.0f) {
+        #ifndef MAGNUM_TARGET_GLES
+        if(Context::current().isExtensionSupported<Extensions::GL::ARB::texture_filter_anisotropic>())
+            glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &value);
+        else
+        #endif
+        if(Context::current().isExtensionSupported<Extensions::GL::EXT::texture_filter_anisotropic>())
+            glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &value);
+    }
 
     return value;
 }

src/Magnum/Sampler.h

@@ -266,9 +266,11 @@ class MAGNUM_EXPORT Sampler {
          * @brief Max supported max anisotropy
          *
          * The result is cached, repeated queries don't result in repeated
-         * OpenGL calls. If extension @extension{EXT,texture_filter_anisotropic}
+         * OpenGL calls. If extension @extension{ARB,texture_filter_anisotropic}
+         * (part of OpenGL 4.6) or @extension{EXT,texture_filter_anisotropic}
          * (desktop or ES) is not available, returns @cpp 0.0f @ce.
-         * @see @fn_gl{Get} with @def_gl_keyword{MAX_TEXTURE_MAX_ANISOTROPY_EXT}
+         * @see @fn_gl{Get} with @def_gl_keyword{MAX_TEXTURE_MAX_ANISOTROPY}
+         * @m_keywords{GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT}
          */
         static Float maxMaxAnisotropy();
 };