revert "try using a triangle-strip-based mesh to save space and possibly improve performance"

This proves to be a bit less performant, and additionally requires
a higher OpenGL version for correct work.

Author: 10110111

models/moon-vertices-indices.bin.7z

@@ -62,7 +62,6 @@
 #include <QVarLengthArray>
 #include <QOpenGLBuffer>
 #include <QOpenGLContext>
-#include <QOpenGLFunctions_3_3_Core>
 #include <QOpenGLVertexArrayObject>
 #ifdef DEBUG_SHADOWMAP
 #include <QOpenGLFramebufferObject>
@@ -5140,13 +5139,7 @@ bool Planet::drawMoon(const StelPainterLight& light, StelPainter& painter)
 	gl->glClear(GL_DEPTH_BUFFER_BIT);
 
 	bindMoonVAO();
-	// Use primitive restart if we support it, and accept the artifacts that will appear if we don't
-	if (const auto gl33 = StelOpenGL::highGraphicsFunctions())
-	{
-		GL(gl->glEnable(GL_PRIMITIVE_RESTART));
-		GL(gl33->glPrimitiveRestartIndex(UINT_MAX));
-	}
-	GL(gl->glDrawElements(GL_TRIANGLE_STRIP, model.indexArr.size(), GL_UNSIGNED_INT, reinterpret_cast<void*>(indicesOffset)));
+	GL(gl->glDrawElements(GL_TRIANGLES, model.indexArr.size(), GL_UNSIGNED_INT, reinterpret_cast<void*>(indicesOffset)));
 	releaseMoonVAO();
 
 	GL(moonShaderProgram->release());