Audio: add an implementation and test for Source::type().

Co-authored-by: Vladimír Vondruš <mosra@centrum.cz>

src/Magnum/Audio/Source.h

@@ -761,6 +761,12 @@ inline Source& Source::operator=(Source&& other) {
     return *this;
 }
 
+inline auto Source::type() const -> Type {
+    ALint type;
+    alGetSourcei(_id, AL_SOURCE_TYPE, &type);
+    return Type(type);
+}
+
 inline auto Source::state() const -> State {
     ALint state;
     alGetSourcei(_id, AL_SOURCE_STATE, &state);

src/Magnum/Audio/Test/SourceALTest.cpp

@@ -25,6 +25,7 @@
 
 #include <Corrade/TestSuite/Tester.h>
 
+#include "Magnum/Audio/Buffer.h"
 #include "Magnum/Audio/Context.h"
 #include "Magnum/Audio/Source.h"
 
@@ -46,6 +47,7 @@ struct SourceALTest: TestSuite::Tester {
     void minGain();
     void coneAnglesAndGain();
     void rolloffFactor();
+    void type();
 
     Context _context;
 };
@@ -63,7 +65,8 @@ SourceALTest::SourceALTest() {
               &SourceALTest::maxGain,
               &SourceALTest::minGain,
               &SourceALTest::coneAnglesAndGain,
-              &SourceALTest::rolloffFactor});
+              &SourceALTest::rolloffFactor,
+              &SourceALTest::type});
 }
 
 void SourceALTest::construct() {
@@ -168,6 +171,15 @@ void SourceALTest::rolloffFactor() {
     CORRADE_COMPARE(source.rolloffFactor(), fact);
 }
 
+void SourceALTest::type() {
+    Source source;
+    CORRADE_COMPARE(source.type(), Source::Type::Undetermined);
+
+    Buffer buffer;
+    source.setBuffer(&buffer);
+    CORRADE_COMPARE(source.type(), Source::Type::Static);
+}
+
 }}}}
 
 CORRADE_TEST_MAIN(Magnum::Audio::Test::SourceALTest)